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Domestic Heating Compliance Guide

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8. 54 Section 7 Underfloor heating systems This section provides guidance on the specification of underfloor heating systems in dvvellings 7 1 Scope of guidance The guidance in this section covers systems that use hot water as the energy carrier and those that rely on electric heating elements It should be used in conjunction with the guidance on central heating systems in the fuel based sections of this guide on gas fired oil fired solid fuel or electric heating systems In order to comply with the requirements of Part L underfloor heating in new dwellings should meet all of the following conditions a The minimum provisions for control of the system and safe operating temperatures given in Table 26 AND b The minimum provisions forfloor insulation and system design to minimise distribution losses given in Table 27 AND c For electric underfloor heating systems in new dwellings the minimum provisions for construction and controls given in Table 28 as applicable to the type of system Table 26 Minimum provisions for control of electric and wet underfloor heating systems Controls Minimum provision Supplementary information 1 System temperature All floor heating systems whether electrical or warm controls water types should be fitted with suitable controls to electric and wet ensure safe system operating temperatures as follows floor heating A separate flow temperature high limit thermostat is syste
9. Supplementary information further guidance on heat pumps BS EN 15450 Heating systems in buildings Design of heat pump heating systems EU Directives for Machinery Safety Low Voltage Pressure Equipment Electromagnetic Compatibility e SAP 2005 DEFRA Carbon Trust Energy Technology List Heat Pumps www eca gov uk EN 14811 Air conditioners liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling ISO 13256 Water Source Heat Pumps testing and rating for Performance Part 1 Water to Air and Brine to Air Heat Pumps and Part 2 Water to Water and Brine to Water Heat Pumps e CE 82 Energy Efficiency Best Practice in Housing Domestic Ground Source Heat Pumps design and installation of closed loop systems EN 378 Specification for refrigerating systems and heat pumps Safety and environmental requirements Microgeneration Certification Scheme Standards MCS007 Product certification scheme requirements heat pumps MIS3005 Requirements for contractors undertaking thessupply design installation set to work commissioning and handover of microgeneration heat pump systems EU Ecolabel Establishing the ecological criteria forthe award of the Community eco label to electrically driven gas driven or gas absorption heat pumps Heat Pump Association Data Sheet Air to Water Heat Pumps TR 30 H
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12. this situation is referred to in this section as areplacement system In order to comply with the energy efficiency requirements of the Building Regulations gas fired warm air heating which is provided as a new system or replacement system in new or existing dwellings should meet the following conditions a The system should meet the provisions for efficiency and installation set out in Table 4 AND b The system should be zoned and incorporate the timing and temperature controls for space heating and where relevant domestic hot water as set out in Table 5 Table 4 Minimum provisions for efficiency and installation of gas fired vvarm air heating systems Minimum provision Supplementary information Efficiency a Gas fired vvarm air units should meet the British standards requirements as appropriate to the design of the BS EN 778 1998 Domestic gas fired appliance or forced convection air heaters for e BS EN 778 1998 OR f BS EN 1319 1999 space heating not exceeding a net heat input of 70 kW without a fan to b If a gas fired circulator is incorporated in the 5 5 Pan LC austion e air and or combustion products warm air unit to provide domestic hot water it should be able to deliver full and part load efficiency BS EN 379 1999 Domestic gas fired at least equal to that prescribed by BS EN 483 for ed convection air heaters for Space heating with fan assisted c The manufacturer s declaratio
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14. Customer willing to install a condensing boiler anyway No Install non condensing boiler in position chosen by customer Install condensing boiler in position chosen by customer 6 Guide to the condensing boiler installation assessment procedure for dwellings ODPM 2005 7 See Note 3 in the Notice to Householders on the calculation and declaration form 69 Completion of the assessment form 1 First complete section 1 of the form 2 If a defective boiler is being replaced within 3 years of the date of original installation under the original manufacturer s or installer s guarantee tick box X and sign the declaration in section 14 of the form omitting sections 2 to 13 Otherwise continue below 3 Complete sections 2 and 3 of the form 4 Decide what fuel is to be used for the new boiler gas LPG or oil and complete section 4 of the form 5 If an oil fired boiler is to be installed before 1 April 2007 then proceed to section 14 of the form omitting sections 5 to 13 Otherwise continue below 6 Complete sections 5 and 6 of the form 7 Consider ALL feasible condensing boiler positions and extended flue options taking no account of householder s preferences In some positions special condensate disposal arrangements may be necessary Some installation options are NOT regarded as feasible for the purpose of this assessment procedure and should NOT be considered They are listed in Tables A
15. category in Table 17 allows for the latter group basing its CO emissions on a typical blend of fuels used in that case Smoke Control Areas Within local authority smoke control areas only anthracite or other authorised smokeless fuels may be used unless the property is fitted with an exempted appliance An exempted appliance is one that has been approved by parliamentaryestatutory instrument for installation in smoke control areas and prospective purchasers should check that the appliance and intended fuel are permitted A list of currently authorised fuels and exempted appliances is given on the website www uksmokecontrolareas co uk Outside a smoke control area house Coal or wood can be burnt on non exempted appliances Wood should always be seasoned to aumoisture content not exceeding 20 to ensure maximum performance and limitthe occurrence of condensation and deposits in the chimney system All solidfuel appliances require appropriate soot fire resistant chimneys discharging at high level locations defined within Approved Document J ADJ Details of HETAS approved chimney products independently tested and approved to accepted standards can be found on the HETAS website The natural ventilation rates of these chimneys may be less than the default values listed within SAP2005 the use of these more accurate values will also reduce SAP values More details are available on the HETAS website 39 5 3 Central heating systems usin
16. it is not possible to switch off the heat output completely but the appliance output can be lowered to a minimum to reduce fuel consumption In most solid fuel systems the room thermostat will switch off the pump which in turn will cause the boiler to operate at minimum output e Some automatic solid fuel systems can be fitted with weather compensation and incorporate multi zone control It is important to seek guidance from the manufacturer especially if the heating package is to include other fuels Table 20 Minimum provisions for insulation of pipes serving solid fuel central heating systems Minimum provision Supplementary information In new systems pipes should be insulated to comply with the maximum permissible heat loss indicated in the Supplementary Information column and labelled accordingly as follows e Primary circulation pipes for heating and hot water circuits should be insulated wherever they pass outside the heated living space or through voids which communicate with and are ventilated from unheated spaces e Primary circulation pipes for domestic hot water circuits should be insulated throughout their length subject only to practical constraints imposed by the need to penetrate joists and other structural elements e All pipes connected to hot water storage vessels including the vent pipe should be insulated for at least 1 metre from their points of connection to the cylinder or they should be in
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18. 99 Communities and Local Government Domestic Heating Compliance Guide December 2008 2nd Edition es fe Communities and Local Government The Building Regulations 2000 As amended 2006 DOMESTIC HEATING COMPLIANCE GUIDE COMPLIANCE WITH APPROVED DOCUMENTS L1A NEW DWELLINGS AND 1 EXISTING DWELLINGS Second edition December 2008 Published by NBS for Communities and Local Government NBS is part of RIBA Enterprises Ltd RIBA Bookshops Mail Order 15 Bonhill Street London EC2P 2EA Telephone orders General enquiries 020 7256 7222 Fax orders 020 7374 2737 Email orders sales ribabookshops com Or order online at www thenbs com buildingregs RIBA Bookshops 66 Portland Place London W1B 1AD Telephone 020 7256 7222 113 115 Portland Street Manchester M1 6DW Telephone 0161 236 7691 Birmingham amp Midland Institute Margaret Street Birmingham B3 Telephone 0121 233 2321 RSUA 2 Mount Charles Belfast BT7 1NZ Telephone 028 9032 3760 Renew Rooms 82 Wood Street Liverpool L1 4DQ Telephone 0151 707 4380 Communities and Local Government Publications PO Box 236 Wetherby West Yorkshire LS23 7NB Tel 08701 226 236 Fax 08701 226 237 Textphone 08701 207 405 Email communities capita co uk Online via the Communities and Local Government website www communities gov uk Department for Communities and Local Government Eland House Bressenden Place London SVVTE 5DU Teleph
19. For new systems Independent control of the hot water circuit should be achieved by means of a cylinder thermostat and a timing device wired such that when there is no demand for hot water both the pump and the circulator are switched off For replacement systems Independent control of the hot water circuit should be achieved where practicable for circulator water heaters of less than 6kW output by means of a cylinder thermostat andsa timing device wired such that when there is no demand for hot water both the pump and the circulator are switched off vi Time control Time control should be provided by use of either Afull programmer with separate timing to each circuit OR e Two or more separate timers providing timing control to each circuit OR Programmable room thermostat s to the heating circuit s with separate timing of the hot water OR A time switch programmer two channel and room thermostat vii Space heating zoning New dwellings with a total usable floor area up to 150m should be divided into at least two space heating zones with independent timing controls one of which is assigned to the living area New dwellings with a total usable floor area greater than 150m should be provided with at least two space heating zones each having separate timing and temperature controls The provisions for zoning for replacement systems in existing dwellings should be as for new dwellings where pra
20. In most instances this will require the building control body to be notified of the intended work before the work commences either by deposit of full plans or by a building notice The execution of the work is then subject to checking and inspections by the building control body with a completion certificate being issued on satisfactory completion of the work In certain situations other procedures apply These include a Where the work is being carried out under the terms of an authorised Competent Person CP self certification scheme no advance notification to the building control body is needed At the completion of the work the registered CP provides the building owner with a certificate confirming that the installation has been carried out in aecordance with the requirements of the relevant regulations and the scheme operator notifies the local authority to that effect b Where the work involves an emergency repair e g a failed boiler or a leaking hot water cylinder there is no need to delay making the repair in order to make an advance notification to the building control body However in such cases it will still be necessary for the work to comply with the requirements and to give a notice to the building control body at the earliest opportunity unless an installer registered under an appropriate CP scheme carries out the work A completion certificate can then be issued in the normal way c Where the work is of a minor nature as
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22. defined for new individual radiator controls such as systems thermostatic radiator valves TRVs on all radiators in the other zones OR iii a combination of i and ii above Temperature e Acylinder thermostat and a zone A method of In some circumstances control of valve or three port valve to control temperature control such as thermal stores domestic the temperature of stored hot water should be provided to a zone valve is not hot water should be fitted prevent excessive tap appropriate a second The use of non electric hot vvater controllers does not meet this requirement e Where permitted by the manufacturer the cylinder thermostat should be wired to provide a boiler interlock water temperatures As far as it is practicable and economic to do so controls should be upgraded to the levels defined for new systems pump could be substituted for the zone valve An acceptable alternative to these is any boiler management control system that meets the specified zoning timing temperature and boiler interlock control requirements 44 Supplementary information controls for solid fuel central heating e Boiler interlock provided by a wiring arrangement to prevent the system from operating when there is no demand for heat should only be fitted if recommended by the manufacturer e In some simple batch fed or automatic appliances without heat stores and or without automatic ignition
23. the formula 1 28 x 0 2 0 051V 3 kWh per 24 hours vvhere V is the nominal cylinder capacity in litres This applies to electrically heated combination units as well as other electrically heated cylinders British Standards BS 1566 2002 Copper indirect cylinders for domestic purposes Open vented copper cylinders Requirements and test methods BS 3198 1981 Specification for copper hot water storage combination units for domestic purposes BS EN 12897 Water supply Specification for indirectly heated unvented closed storage water heaters Vented and unvented systems vi vil viii Cylinders should either be factory fitted with or have provision for two thermostatically controlled electrical heating elements or immersion heaters The lower element should be capable of heating up at least 85 of the cylinder contents The upper element should be capable of heating at least 60 litres of water The lower element should be connected so as to utilise the off peak electricity tariff and the upper for boost operation The vessel should be designed such that following reheating to 60 C from the off peak element at least 8096 of the contents can be dravvn off at 45 C or above at a flow rate of 0 25 I s Primary stores Primary stores designed for electrical heating should have a standing heat loss at least 1596 lovver than that specified by the insulation requirements of sections 4 3 1 or
24. using a cylinder is not considered essential for CH and could be a disadvantage with CHP based systems increasing the morning peak demand and hence causing more use of the boiler than necessary 3 Temperature control of space heating e Separate temperature control of zones within the dwelling should be provided using i room thermostats or programmable room thermostats invall zones OR a room thermostat or programmable room thermostat in the main zone and individual radiator controls such as thermostatic radiator valves TRVs on all radiators in the other zones OR iii a combination of i and ii above Control valves and TRVs should be two port type to reduce flow rates under Differential pressures across the control valves and TRVs should not exceed maximum values to ensure that the control valves work effectively and maintain shut off 4 Temperature control of domestic hot water e Temperature control of the domestic hot water service should be provided by means of two port control valves either electrically operated or direct acting Where instantaneous heat exchangers are used the control valve should be selected to maintain steady temperatures lt 5 C for a range of draw off rates and primary differential pressures To reduce the incidence of scaling the control valve should shutoff the primary flow when there is no domestic hot water draw off A small intermittent flow
25. 3 Gas fired range cookers with integral central heating boiler 16 2 4 Gas fired warm air heating 17 2 5 Gas fired fixed independent space heating appliances 19 2 6 Gas fired fixed decorative fuel effect fires 21 2 7 Gas fire for secondary space heating provided as part of a combined fire and back boiler unit 21 Section 3 DOll fired space heating and hot water systems 23 3 1 Scope of guidance 23 3 2 Oil fired wet central heating systems 23 3 3 Oil fired range cookers with integral central heating boilers 29 3 4 Continually burning oil fired vaporising appliances providing secondary heating or hot water 30 3 5 Oil fired fixed independent space heating appliances 31 Section 4 Electric heating systems 32 4 1 Scope of guidance 32 4 2 Electric boilers serving central heating systems in new and existing dwellings 32 4 3 Electric heating systems other than central heating using electric boilers 36 Section 5 Solid fuel heating systems 38 5 1 Scope of guidance 38 5 2 Solid fuel appliances for primary heating 38 5 3 Central heating systems using certain types of solid fuel appliances 40 5 4 Solid fuel appliances for secondary heating 46 6 Community heating systems 48 6 1 Scope of guidance 48 6 2 Definition of community heating 48 Section 7 Underfloor heating systems 55 7 1 Scope of guidance 55 Section 8 Heat pump systems 58 8 1 Scope of guidance 58 Section9 Solar water heating 62 9 1 Scope of guidance 62 Section 10 Individual domesti
26. Electric Heating System Minimum provision Supplementary information a Electric warm air systems 1 Time and temperature control either integral to the heater or external Provide either i A time switch programmer and room stat OR iisa programmable room thermostat 2 Zone control Dwellings with a total usable floor area up to 150m should be divided into at least two space heating zones with independent temperature control one of which is assigned to the living area Dwellings with a total usable floor area greater than 150m should be provided with at least two space heating zones each having separate timing and temperature controls Time control should be provided using either i multiple heating zone programmers OR ii a single multi channel programmer OR iii programmable room thermostats OR V separate timers to each circuit OR V a combination of ili and iv above Single storey open plan dwellings in which the living area is greater than 70 of the total floor area sub zoning of temperature control is not appropriate b Panel heaters Local time and temperature control Time control provided by a programmable time svvitch integrated into the appliance or a separate time svvitch Individual temperature control provided by integral thermostats or by separate room thermostats or programmable room thermostats Panel heater systems provide instantaneous heat
27. Sjeinjoesnuew v Sulpnyoul iesen SU o uonel do SU pue 6 5 y uolneueg dx iin auf pinoys Jaljeysu u q UV SAS BE O1S Join 104 10 pue 4 llOQ sejnoed y o 21 10005 q 640 0 5 11 s ul suolonulsui 5 v YUM ul PSUOISSILULUOD q pinous 1lu uudinb y sionuo3pue sduind yomedid se yons uldinb p eloosse ullA uje1s s BE10 S JOY JO llOQ E JO UOUSIEISUL y JO R ldulo2 UO e sBuI ll AAp Bunsix pue Mau u SUZ SAS M U 40 UOISIAOJd WNWIUIN Buluol ssitutuuo2 p nunuo L lqeL 14 sju uu uamb u onuoo y oH lul pue pue Buu Huluoz payloads ay s1 uu yev l s S ionuoo 4 OO 51 9 oof 0 uv MMM ayisqam VIWO VI Siainjoejnuey 5 011402 JO UONLNOSSY a v UO pUe ln BH lil S AINJOSJNUeUW u PUNOJ aq UBD SUH S S O4U02 UO BIO Me uawajddns UOISIAOI LUNUWIUILW E SE p e1sui q p nous e souu u s puli jeojueyoowu OUL H U E eloo 2U172ele Jo DU y Sepnjoaid yey 9d 6 4O ei uOonpIgIsut y JO JUeLUEDe de1 AousHhiewWe se yons s ouelsuuno4l9 euol daoxe ul A PA UOZ u1 Jot p ininsqns
28. They can be matched with a main heating system fired by the same especially wood fired or a different primary fuel or off peak electricity to reduce carbon emissions especially wood fired with or without thermostatic control Many designs can provide heating during power cuts Mineral fuel appliances can be chosen but the attention of designers is drawn to the probable need to supply additional measures as the carbon emission values of these tend to be high Mineral fuel appliances may oftemhave slightly higher efficiencies than their wood burning counterpartssMulti fuel room heaters can enable the user to burn renewable wood as well alternative to mineral fuels outside smoke control areas c Small solid fuel stoves The efficiency of these be higher than for dry appliances They can be with boilers integrated with the primary wet heating system Multi fuel appliances enable the householder to burn renewable wood outside smoke control areas d Range cookers Typically appliances are installed in a living area and are designed to provide some useful heat from their case into the space in which they are located They are available in a variety of shapes and sizes and can incorporate a boiler which can be connected to dual fuel integrated systems e g link up Multi fuel versions are also available Where requested open These do not have thermostatic control of the burning rate and have lower fires HETAS categories e
29. U OO yiewiyouag y e joen y JO 1 pajulodde ue 5 Suns x u YJOM JO SB y Ul Japjoyasnoy ayy 40 4 plInQ ay o p piAo d aq pinous sily q yewyou g 91 Hed YUM 82upli du oo ul 1u uudinb y Jo uonelado 1112121 MOUS S NS 1 ay pue BpeW u q 5000 y Up 124 Ps0De UE y ey OS uu s s y EUIUO SS LULUO suosiad y Aq uol duuo2 104 oup ldde y lu 191 P apIAOJd sJ pjoy U T HO OB SHES JNO paleo u q sey BuluoIssiuuuuo2 15U moys 0 pasn aq UBD JSIPYIOYD HuJUoISS WIWOD YyeWYIUE OY e 15 yreulyoueg u l uoneuuuo ul Aieyuswiejddns SUH 3S S Mau 10 SV Sbuutaup Sunsix ul suu s s 1u uu 23pl da 40 UOISIAOId WNWIUIN HOA y JO JUBWSDUSWILUOD y 0 JO oluo2 Ainou pinous YOM v Buluolssiuuuuo2 uosi8d y JO J9 E SU v SuonEMn6 k v UUM 52u ei duio2 1 Jo s sodind y uosi q 1u 1 duuoo e UW 6 1ou Up HEU Q 1194 UO 01 UO09 Ainou pue Sunsix ue UL JO SE y Ul 4 plovu snou JO l plinq 94 o 92N souUe dwoy suoneymn6 k Bulpling e pues ili OUM OHOO nou Pinoys s reqsul ItOO 24 lduuo s s lloq paulj seb e Jo uolleyeysul BY 99U0 2 D pIAO1d ale yenueuu
30. U T LMH fEUOSE S HO enjea ou lojJj up ldde ue A32u l 9ijJJ YoUMS ynaqq48s 9688 uey ss l 104 q pinous Aduan e ajqeyda00e 84049 ey 5ul4nu pi uo aduepiny5 JO f n e 1ou slu uu Sp d ti 72002 IHdV 1oj q p lle sul Sioiiog 104 uunulluliN uoneuuo ul Sbuutaup Sunsix ul suu 1s s 1u uu 23pida 10 uotstao id WNWIUIN s5ull Mp Sunsix pue Meu Ul suu s s M U JO UOISIAOJd WNWIUIN ezeUdoudde Sunsix ul pue sSHuljjamMp Mou ul suu 1s s Bunesu yo HUIUOISSIWIWIOS pue uonp ed ld uu 1s s aHe10 S 10U WId SAS Aou l LH l lloq 10 540151 WNWIUIN 6 QEL 25 SI B U 4 15AA E401S pajeay 404 uolleoljJio ds 7iddns l e 26821 NS 58 SDOU1 UI 1S pue sju wanb y si pulj 5 4 ddo u do s sodund ns ulop 4OJ SJ pUIJ O Papu s ddoo 2002 9991 58 sp4epue1sS usnug unu pguuwyn oo usJj B5une u 81eA MMM S O1S 8 1 UONE NM S pajejnsul Ia ase S U 1811 148400 11 SI 11 S 40 S Mewud Ul sasnjesadua abelojs jeuou uey 1 uBlu v JO snes g sas
31. being obtained from the Environment Agency Heat may be supplied to the dwelling either by a water based heating system water to water heat pumps or by an air distribution system water to air heat pumps Air source systems ASHP Air to water Air to air Air source heat pumps extract heat directly from the ambient air Heat is supplied to the dwelling either by a water based heating system air to water heat pumps or by an air distribution system air to air heat pumps Air to air heat pumps may be single package or split systems All heat pump systems are at their most efficient when the source temperature is as high as possible the heat distribution temperature is as low as possible and pressure losses in air and water systems are kept to a minimum If installed in a new dwelling heat pumps should use refrigerants complying with the provisions of EU Directive 2037 2000 Heat pumps should be CE markedin accordance uvith the relevant EU Directives where applicable e g machinery safety low voltage pressure equipment electromagnetic compatibility If summer cooling is provided by the heat pump it is recommended that condensate drainage from the fan coil units is provided In order to comply with the requirements heating systems using a heat pump as the heat generator such as underfloom warm air and medium temperature radiator systems in new and existing dwellings should meet all of the following conditions a Electricall
32. c Storage heaters 1 Charge control Automatic control of input charge should be provided Charge control is the ability to detect the internal temperature and adjust the charging of the heater accordingly 2 Temperature control Controls for adjusting the rate of heat release from the appliance should be provided such as adjustable damper or some other thermostatically controlled means 37 Section 5 Solid fuel heating systems This section provides guidance on the specification of solid fuel heating systems for dvvellings 5 1 Scope of guidance The guidance given in this section covers the following types of solid fuel heating appliances and systems used to deliver primary and secondary heating Batch fed open fires Batch fed and automatic feed dry room heaters stoves Batch fed log and multi fuel appliances Automatic feed pellet stoves Batch fed and automatic feed room heaters with boilers Batch fed cookers vvith boilers not exceeding 7 5kVV Batch fed independent boilers and automatic feed anthracite wood pellet wood chip and wood log fired independent boilers e Central heating systems using certaim types of solid fuel appliances Where appropriate it may also be necessary to refer to the sections of this guide on community heating underfloor heating solar water heating and micro CHP 5 2 Solid fuel appliances for primary heating In order to comply with the requirements solid fuel app
33. condensing boiler installation assessment procedure for dwellings the Guide It should consider all feasible condensing boiler installation options subject to the restrictions given later for whichever fuel has been chosen by the householder natural gas LPG or oil For the purposes of the assessment boiler positions preferred by the householder are not relevant The lowest cost position should be found and recorded on the form 5 An assessment score exceeding 1000 points indicates thatexceptional circumstances exist In these circumstances the installation of a condensing boller is not considered necessary to meet the requirements of the Building Regulations Householders may still choose to install a condensing boiler and they may be eligible for a grant that defrays some of the additional costs 6 The assessment result is restricted to the chosen fuel for the new boiler and is not valid for a different fuel 7 Whether a condensing or non condensing boiler is chosen it need not be installed in the position shown on the assessment form s it difficult to install a condensing boiler in this building s it possible to install a condensing boiler in this building Complete the form Complete e form and for installation declaration option with lowest assessment score Does total assessment score Box T show that installation is uneconomic
34. control system that meets the specified temperature timing zoning and if applicable boiler interlock control provisions When electric boilers are installed as a replacement for existing boilers the minimum level of system controls should be installed as described in Table 12 unless they are already installed and fully operational If an individual component of the control system is being replaced in an existing system for example a room thermostat it is not necessary to upgrade the system to meet the minimum provisions AND e The minimum provisions for hot water storage systems and labelling of storage vessels as given in Table 13 should be met AND f Pipework should be insulated in accordance with the minimum provisions described in Table 14 32 4n blo S OHUOOBUHE N MMM HSQ AA VINOWL y UO pue m li Ssounjoejnuew ul aq upo SW JS S 01 U09 uo S IE1 D I0 uoloe ajeudoidde SUI9JSAS M U JO p ulJ p SY SUH 3S S MAU 10 p ulJ p SY M OH UL D AOMd JOU s op UOTE SAYL S A BA JO EIPEIDIPEJSOWSU JO BSN ul HO payoyms aie dund pue q lloq y Udy yeuudoidde JayeM joy 10 Buey XEds y 19449 WO 1894 20 ou SI 3194 U UM PY OS D IIA ae O1 UOD YOIYM Ul O1JUOD Pjnoys uu 1 s s out MHA Ss lddns osje oun Ji suoHpuo Sune vu aoeds uo Sulpu d p 13f m Mewid v o
35. detailed in Schedule 2B of the Building Regulations see page 14 of ADL1B the work must comply with the relevant requirements but need not be notified to building control Section 2 Gas fired space heating and hot vvater systems This section provides guidance on the specification of gas fired space heating and hot vvater systems in dvvellings All gas appliances must be installed by a competent person in accordance with the current issue of the Gas Safety Installation and Use Regulations The installation should follow the manufacturer s instructions and should comply with all other relevant parts of the Building Regulations and for wet systems the Water Regulations 2 1 Scope of guidance The guidance in this section applies to systems fuelled by natural gas and liquid petroleum gas LPG any requirements specific to either fuel type are identified The following types of gas fired heating systems are addressed Wet central heating systems Range cookers with integral central heating boilers Warm air heating systems Fixed independent space heating devices Where appropriate it may be necessary to refer to other sections in this guide covering community heating underfloor heating heat pumps solar water heating and micro CHP 2 2 Gas fired wet central heating systems This section provides guidance on the specification of gas fired wet central heating systems for dwellings that if followed will satisfy the requiremen
36. features Link up systems It is possible to connect together two or more heating appliances with boilers at least one of which can be solid fuel fired to maximise flexibility and efficiency For example an oil or gas boiler could be combined with a wood burning stove with boiler sited in the living room This combination with wood burning appliances vvill reduce overall carbon emissions Both systems should be designed to appropriate installation codes 41 6 1 B A abesojs p u uololjio ds Ajddns 1682 NI 58 s sod nd ns ulop 104 SHUN UOUPLUIOLUIOO BE401 S 1 BAA joy q ddo 104 uoneoyo ds 1 61 861 58 6 1S pue S UeweIINDaY sapujo u dg sasodund ns ulop s4 pul o 1 s ddoo 2002 9991 58 sp epusis usnug NP BlouajzeMjoy MMM ISQIOJS 10 UOHEOLN O S UPULOL c UOHE VOOSSV J PAA JOH ele s y yey JueLIOdUI A SI 1 Seimp aocdtue afp o1s Jewuou uey 1 uBIu v Jo sne g ue 5 P 18 D lOHU0 aq O SI eirupiacdtue q nno Jeipan 101 HS UIOQ uue s s jan D OSSE Woy S 1B U UOJSJAWILWI VT B A 1SO M lqissod pue 1 em 101 ainsseid sulew osje Aay p sn ase suapuljAD 6e10 s 1nq spousd JequUunys
37. functional requirements for building design and construction The government department responsible for producing and revising the Building Regulations This second tier document in support of Approved Documents L1A and L1B sets out the minimum provisions for all conventional space heating and hot water systems provided in new dwellings and for work in existing dwellings to comply with the Building Regulations energy efficiency requirements In this document minimum provisions refers to the provisions needed to demonstrate compliance of space heating and hot water systems installed in dwellings with the Building Regulations energy efficiency requirements The commentaries labelled Supplementary nformation may be useful when interpreting the minimum provisions and in some cases provide links to best practice guidance The Government s Standard Assessment Procedure for Energy Rating of Dwellings 2005 edition Section 1 3 The Building Regulations requirements and the guidance in Approved Documents L1A and L1B The Building Regulations that bear on energy efficiency are repeated for easy reference at the front of both Approved Document L1A and Approved Document L1B before the sections giving technical guidance on compliance The Approved Documents can be viewed at www communities gov uk planningandbuilding buildingregulations For new dwellings the provision of heating and hot water services systems has to be
38. in this section applies to the following types of heatpump technologies Heat pump type Warm or hot VVarm air water systems systems Ground source systemS GSHP Ground to Ground to air Heat energy is extracted from the ground using closed pipe loops buried water horizontally in trenches or in vertical boreholes that are connected back to the GSHP The fluid circulating in the closed loop is normally a water propylene glycol antifreeze mixture or accepted equivalent but some direct expansion GSHPs use refrigerant Open loops may also be used to collect water from an aquifer and discharge via a separate aquifer downstream of the water table flow systems of this type normally require permits from the Environment Agency Heat extracted from the ground may be supplied to a dwelling either by a water based heating system ground to water heat pumps or by an air distribution system ground to air heat pumps Water source systems WSHP Water to water Water to air Heat energy is extracted indirectly from a water source using closed pipe loops as a heat exchanger The closed loop is connected back to_the water to water heat pump The water source may be a lake pond or river or other stable water source The fluid circulating inthe closed loop will normally be water but a water propylene glycohor accepted equivalent antifreeze mixture may be used depending on operating temperatures Open loops may also be used subject to the permits
39. indul amod Sulie npoul Jo lqede aq pue onuo ainyesod9 M H UI Dau pinous s lloq SUL yooH ul J llog Zp lIonuo5 Lp p SUH 1S S Mau JO SV l UA jenuew Joen SJjeinjoesnuewW y Sulpnyoul sn au o yvuonei do eu pue uu 1s s y JO in pinoys z llelsul q Suejduuo32 MOUS O p ldulo q Pinoys p109 1 Buluoissiuuuuo2 E pue pinous Buluoissiuutuuo2 JO SUOIJONJYSU s g ln einuRiN E BuluoissitutuoO o Koua ul uoh np r nb suo y pue jeos w Jo uoenunsse Jo ae y 0 9 UOIPEUIQUUOD JO JINDIIO 1972M 104 v PUE 5 H YA O 197EM D y 7291 O PLU q p nous UOISIAOJ uoliu s d sped 002 sp x ss upiey JA EM fE10 surew 3y D s pouu lloq enpiAIpui JO slu uu uinba i 6120905 pue songod 1lu ule l1 ayeudoidde 104 SUO ONAYSU 21501 su in oejnueuu 4d lloq v o 19491 OS E pinous su jie1suj 23 0002 669 98 Ul uo U AI suu 1s s 1015591 pug 0 moy UO BoUePINGH y Aojioj 0 9Q 0161 Suol onu su jqeuose y abpnis pue ajeds JO u1 PUL 01801100 01 U09 0 YNO v yu unp n s4ainjoesnu
40. is an advantage to maintain thestemperature within the heat exchanger so as to provide more rapid heat up 5 Limitation of maximum flow rate into building or dwelling e The maximum design flow rate into the dwelling heating system should be limited by suitable control and balancing valves to maintain the overall balance in the network and to avoid excessive pumping energy 51 Table 24 Minimum provisions for domestic hot water production storage and water treatment heat meters and commissioning for community heating Minimum provision Supplementary information d1 DHW production and storage The hot water system should be controlled using variable volume control principles and be designed to maintain low return temperatures in the primary CH circuit Hot water can be produced in four ways in CH systems in individual dwellings using indirect storage cylinders in individual dwellings using instantaneous plate heat exchangers e centrally using storage calorifiers with eitheran indirect coil or an external plate heat exchanger centrally using an instantaneous plate heat exchanger in selecting the system consideration should be given to e the impact on return temperatures in the community heating system e the impact on flow rates in the community heating system e the impact on heat demand profiles and compatibility with the heat source e standing losses from sto
41. located centrally between the rooms being heated thus minimising the length of interconnecting services ii Service pipes carrying hot water to more distant rooms should be insulated or routed via conduits to reduce distribution losses and the risk of overheating the room or floor finish 56 YORS Ul pue Ajajes 104 PIOA 100 JWI pue eoeds JO1JUOD 8 jenuew YUM SYE SOUL U slon nuoo l MOJ ZZ QEL u p ulj p se Joie uone nsui AHSIS IIEUL U E uo US ULL 10011 1u gAInb 194 0 JO 14 E AO Q IEOU JO AIS upe Bulpp q l ul peyeinsdeous ww uey ss SSEeUYOIY JO eu 1euu 1lu eAInb 10 sseuyeW peyeouqejeid e ulu pinoys s lqe ioo u pun 51191525 Bunp uq 100 uon n nsuoo 911 99 9 in s pun Bale UOP Ul pue Ajejesdo PIOA 4001 HU pue auNyesediu9e eds 101 U09 Pinoys anea penuew YIM SYE SOUM U WOO ajqewweibdid Sioo J A quun ul Ionuo5o slonuoo 1elsouuj u1 149uun AOQE JZ lQEL UU SCOUEDIOOOE u Buu Ao2 Joo j Aue Jo S 2 H y DUR s1u uu uInb 1 J Hed pue T Yed UA duuo3 ol uORP nsuL UA
42. may be possible The status of alternative provisions is explained in the Use of Guidance sections at the front of the Approved Documents The guide also refers to third tier publications which include information on good practice for design and installation over and above the minimum regulatory provision 1 The Building Regulations SI 2006 652 including Part L of Schedule 1 apply in England and Wales Separate regulations apply in Scotland and Northern Ireland and may require different provisions than those signalled in this guide as the minimum regulatory requirement 1 1 Hovv to use this guide The Domestic Heating Compliance Guide provides guidance on the means of complying with the requirements of the Building Regulations Part L for conventional space heating systems and hot water systems in dwellings The guide comprises four self contained fuel based sections and five specialist technology specific sections Each fuel based section addresses the requirements applicable to primary and secondary space heating and hot water technologies for the particular fuel The specialist technology specific sections provide further guidance on the minimum provisions for particular specialised space heating and hot water technologies The structure of the guide is illustrated in Figure 2 and is as follows Fuel based sections Section 2 Gas fired primary and secondary space heating and hot water Section 3 Oil fired primary an
43. s ti Jam ap lu uu J6v Jo peog usnug u Aq payeo q J A ase s u 150 JUeLOALUI HO 26821 NA 98 2 1 SI 11 S 4O S Mewud ul plnous sjonposd 6 5 Beuols 1942M OU Dean Q be10 s fEULIOU uey ay O ENG g002 99S Sg JO siu uu _uinb i JaBUeYOXS 1894 pu ssol Je u e6e10 s sazojs Mewrd Jo uonejnsuj SUH S S Mau 10 sy ul UlA Ajdwod pinous S SS A Beuo1s 197eM 104 1 ddo9 Doan JOH 3 Sunsix ul s6uljjamp uoneuuuo ul suu s s 1u uu 23epld a 10 UOISIAOJd WNWIUIN pue Meu u SW JS S M U 40 UOISIAOJd p nunuo lqeL 13 quBu do si y pue p77 Punon uoneunozujiojem oH pue l q yey AH lOD up doun3 e se pasajsibas s y euiyou g 1no e pue yooq Daao d ay pue obojyetuyousg y sn o elle aq e DIOU oym S lUEduuO buyinjoejnuew AHC e 82 SAONOIUDI pue siauea o 5 5 sjlejap 404 Suled z pue 121 5 Ui 1SISSP Ul 18 1 BY 1noqe uonpuuojJul p10934 S lE1SUI Ajay O sjenuew 618 1 SG QUM L Jainjoeynuew 19 109 586 OIHH Ile u q III A JSIYIOYD DUVUO SS U
44. section providing guidance on CH assumes that a radiator system is employed similar to that for gas fired central heating systems 6 2 Definition of community heating A community heating CH system is one that supplies heat to a number Of dwellings from a common heat source It may comprise for example a system heating a block of flats or a larger scale system heating many buildings Systems that supply fevver than 15 dwellings from a central boiler system are not covered in this section of the guidance and the guidance given for individual dwelling heating systems should be followed for these applications where appropriate The guidance in this document assumes that the CH distribution system uses hot water as the energy carrier Hot water service systems may be generated centrally within each building or in individual dwellings Minimum provisions for connection of dwellings to a new CH scheme In order to comply with the requirements of Part L new CH systems to supply both new and existing dwellings should meet the following conditions a The minimum provisions for system design to maximise the efficiency of heat generation and minimise energy use by pumps should be met as given in Table 21 AND b Where the system uses low carbon heat sources e g CHP biofuels or heat pumps the minimum provisions for the lead heat generator should be met as defined in Table 22 AND c Where heating systems are to be installed for new dwel
45. the Building Regulations energy efficiency requirements In order to comply with the Building Regulations energy efficiency requirements oil fired range cookers with an integral central heating boiler which are provided in new or existing dwellings should meet the following conditions a The appliance should have two independently controlled burners one for the cooking function and one for the boiler AND 29 b The boiler should have a Seasonal Efficiency SEDBUK5 value in excess of 75 The appliance manufacturer s declaration of appliance performance shall include the following words Seasonal efficiency SEDBUK xx Case heat emission value yy KW Heat transfer to water at full load zzkW The efficiency values may be used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings The test data from which they have been calculated has been certified by insert name and or identification of Notified Body See www rangeefficiency org uk AND c The minimum provisions for oil fired central heating systems should be met with respect to the integral central heating boilers as given in Table 9 rows b e AND d The minimum provisions for boiler interlock zoning and time control and temperature control of the heating and hot water circuits should be met with respect to the integral central heating boilers as given in Table 10 for oil fired central heating systems An acceptable alternative
46. this guide on underfloor heating Space heating may be sized to meet all or part of the space heating load Secondary heating will be required if the heat pump is sized to meet part of the space heating load Fan coil units Supply water temperature to the fan coil units should be in the range 35 C to 45 C Fan coil units may be utilised for heating only or for winter heating and summer cooling b Installation i The water distribution system should be arranged for reverse return operation to maximise efficiency and ease of commissioning and future maintenance ii Pipework not contributing to the space heating should be insulated to prevent heat loss following the guidance in the TIMSA guide H summer cooling is provided by the heat pump all water distribution pipework should be insulated to prevent condensation following the guidance in the TIMSA guide iv External pipework between the dwelling and the ground heat exchanger should be insulated following the guidance in the TIMSA guide v The ground loop water circuit should be protected with an antifreeze solution and inhibitor as recommended by the heat pump manufacturer The internal water distribution circuit should contain an inhibitor and may be protected byan antifreeze solution as recommended by the heat pump manufacturer Vi A pressurised water distribution system with expansion vessel is recommended Constant water flow
47. to solar heated storage should be insulated in the follovving situations e All pipes of a solar primary system should be insulated throughout the length of the circuit e All other pipes connected to hot water storage vessels including the vent pipe should be insulated for at least 1 metre from their points of connection to the cylinder or they should be insulated up to the point where they become concealed Pipes should be insulated with materials labelled as complying with the Domestic Heating Compliance Guide and in line vvith the guidance in the TIMSA guide The insulation should be suitably rated for the maximum foreseeable pipe temperature applicable and where external also be resistant to vermin attack and climatic degradation In a dwelling that already has a solar hot water system it is recommended that the insulatiomshould be upgraded in line with these minimum provisions where significant work such as change of solar storage is carried out A fully filled or drainback solar hot water system can have a pipe service temperature of 150 C Therefore an insulation material should be specified to accommodate this temperature An EPDM based rubber vvould normally be a minimum requirement for such an application Any insulation specified must be better than 0 044 VV m K at 40 C mean and the insulation diameter must be 8790 of the pipe diameter Insulation materials that are labelled as complying with the Domestic Heat
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50. 4 3 2 of the Water Heater Manufacturers Association performance specification for thermal stores Labelling All hot water storage vessels should carry a label with the following information e type of vessel e nominal capacity in litres e standing heat loss in kWh day e heat exchanger performance in kW Water Heater Manufacturers Association Performance Specification for Thermal Stores www waterheating fsnet co uk wma htm Insulation of primary stores Due to the higher than normal storage temperatures in primary stores it is very important that these are well insulated 35 Table 14 Minimum provisions for insulation of pipes serving central heating systems with electric boilers Minimum provision Supplementary information In new systems pipes should be insulated to comply with the maximum permissible heat loss indicated in the Supplementary Information column and labelled Insulation for pipework in unheated areas Extra provision may need to be made to protect central heating and hot water pipework in unheated accordingly as follows areas against freezing Further guidance is available in BS 5422 2001 Method for specifying thermal insulating materials for pipes tanks vessels ductwork and equipment operating within the temperature range of 40 C to 70020 BRE Report No 262 Thermal insulation avoiding risks 2002 Edition e Primary circulation pipes for heating and hot wat
51. 4q q e HO 268Z NZ Sg Um Alduuoo plnous sonpold uu 1s s 15 1972M JOY Dean 23 9991 Sg Jo s1u uu uinb i JaBUeYOXE 1894 PUB SSO ye y 9y UAL Alduso pjnoys s ddo uey Joo 5 8121 84 u SIBpUI AD 0 8612 SG JO 000Z 1 9991 Sg Jo siueueinbea s Bupu x esy pue ssol 1e u y UUM p nous S SS A E40O1S 197e 104 JOddod 26e101S 49 2M JOH 3 winiwasd Aalen e Aed o Ajayi ave su plou snou silu Mojeq peuajaid are y 0GZ uey 4 J6 si yunq 1nq jan pijos 104 payloads s f n Jo qnuenb uunuulul uu ON suu s s Mau JO SV si Au L3se Te Jo Aqloedeo Beuols ont e POOM 104 uolleoo AUP pue 1 2 Ul l n y s nnuenb qeuose i 9 JO pew q PINOYS UOISIAD d 9 jany q p sn 0u pjnoys pue s np l wajsXs paduind e s sp WOS u NIJ SIU1 p sn aq eul WajsAs uoudisouusu e pue 181 wooaIy eq BY Ajuowwoo SI SIU D Q Buu p nouus y uuoJJ 1 u ed ss p o JOJeIpe yea 159U P nb s suu s s Bul u jenu Ian pilos 1SOVV Sul S S MAU JO SV suu 1s s 1u uiu 3p jd 40 UOISIAOJd Deen s CU 5 guu
52. 5 C Further assistance in converting these heat loss limits to levels thickness of insulation for specific thermal conductivities is found in the TIMSA HVAC Guidance for achieving compliance with Part L of the Building Regulations 45 5 4 Solid fuel appliances for secondary heating In order to comply with the requirements of Part L solid fuel appliances in new and existing dwellings that are provided for secondary heating and that are not part of a central heating system should have a minimum efficiency gross calorific value no less than specified in Table 16 for that category of appliance Supplementary information solid fuel appliances providing secondary heating Minimum efficiencies The minimum efficiencies for solid fuel appliances are published by HETAS in the Official Guide to Approved Solid Fuel Products and Services and on the website www HETAS co uk HETAS also certifies and publishes actual appliance efficiencies following type testing in a notified laboratory to a harmonised European Standard to enable an installer specifier to meet these regulations Appliance types Appliances which are most suitable for secondary space heating are summarised in the table below Appliance type Notes a Open fires with high output boiler when used with link up b Small solid fuel room These can be a dedicated wood burner or burn logs in a multi fuel appliance or heaters stoves use pellets
53. 86 Code of practice for solar heating systems forswimming pools prCEN TS 12977 3 2006 Performance characterisation of stores for solar heating systems prCEN TS 12977 2 2005 Thermal solar systems and components Custom built systems Test methods TS 12977 1 2001 Thermal solar systems and components Custom built systems General requirements BS EN ISO 9488 2000 Solar energy Vocabulary BS EN 12976 2 2006 Thermal solar systems and components Factory made systems Test methods BS EN 12976 1 2006 Thermal solar systems and components Factory made systems General requirements BS EN 12975 2 2001 Thermal solar systems and components Solar collectors Test methods BS EN 12975 1 2000 Thermal solar systems and components Solar collectors General requirements ISO 9553 1997 Solar energy Methods of testing preformed rubber seals and sealing Compounds used in collectors BS 3734 1 1997 Rubber Tolerances for products Part 1 Dimensional tolerances BS 903 0 2003 Physical testing of rubber Part 0 General BS 6920 2000 Suitability of non metallic products for use in contact with water intended for human consumptionwith regard to their effect on the quality of water ISO TR 10217 1989 Solar energy Water heating systems Guide to material selection with regard to internal corrosion BS 8000 Workmanship on building sites BS EN 12897 Water supply Specificati
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55. Requirements relating to various aspects of the installation of condensing boilers are given in British Standards BS 5440 Parts 1 and 2 BS 5449 and BS 6798 22 Section 3 Oil fired space heating and hot vvater systems This section provides guidance on the specification of oil fired space heating and hot vvater systems in dwellings to meet the Building Regulations energy efficiency requirements All oil appliances must be installed by a competent person and the installation should follow the manufacturer s instructions and comply with all other relevant parts of the Building Regulations and for wet systems the Water Regulations 3 1 Scope of guidance The guidance in this section applies to systems fuelled by oil The follovving types of oil fired heating systems are addressed Wet central heating systems Range cookers with integral central heating boilers Vaporising appliances providing secondary heating or hot water Fixed independent space heating devices Where appropriate it may be necessary to refer to the sections in this guide covering community heating underfloor heating heat pumps solar water heating and micro CHP 3 2 Oil fired wet central heating systems This section provides guidance on the specification of oil fired wet central heating systems for dwellings that if followed will satisfy the energy efficiency requirements of the Building Regulations Terminology and applicability of guidance to different
56. T and A2 They do not necessarily contravene standards or regulations and in some cases they may be acceptable to the householder but they are not acceptable for the purposes of the assessment Further advice on the bases of Tables A1 and A2 is given in the Guide 8 If there are no feasible condensing boiler installation options proceed to section 14 omitting sections 7 to 13 Such cases are unusual and a clear explanation should be inserted in section 14 following the advice in the guide Otherwise continue below 9 Complete section 9 inserting points from Table Where a change of boiler fuel is proposed the assessment should reflect this decision 10 Complete sections 7 8 and 10 to 13 for the installation option that gives the lowest assessment score in section 13 Evidence may be required that all feasible options have been considered and that this is the lowest scoring option so forms used to assess other options should be attached when the final signed form is made available 11 Complete and sign the declaration in section 14 ticking one box only Supply the completed form to the householder for use when the house is sold and retain a copy for building control compliance purposes 70 Table A1 Flue and terminal installation options that are NOT to be considered Flue and terminal positions that do not comply with Approved Document of the Building Regulations A shared flue unless specially designed to be shared by
57. VCA Guide to Good Practice Heat Pumps 61 Section 9 Solar vvater heating This section provides guidance on the specification of solar vvater heating for dvvellings 9 1 Scope of guidance The guidance in this section covers solar systems vvith a collector area of less than 20m and solar heated water storage of less than 440 litres It does not cover systems intended to contribute exclusively to space heating or systems providing heat exclusively to heat swimming pools It should be used in conjunction with the guidance on water heating contained in the fuel based sections of this guide In order to comply with the requirements of Part L solar water heating in new and existing dwellings should meet the following conditions a The minimum provisions for collector certificationyidentification and testing specified in Table 31 row a AND b The minimum provisions for selection of transfer fluid in the collector primary loop given in Table 31 rovv b AND c The minimum provisions for circulation pump power given in Table 31 row c AND d The minimum provisions for heat exchanger sizing given in Table 31 row d AND e The minimum provisions for control of the system given in Table 31 row e Where work is carried out in a dwelling that already has a solar hot water system it is recommended that the system control is upgraded in line with the minimum provisions for systems in new dwellings AND f The minimum provisions fo
58. abelling of storage vessels as given in Table 9 row c need to be met AND 23 d The minimum provisions for system preparation and water treatment as given in Table 9 rovv d should be met AND e The system should be commissioned in accordance vvith the minimum provisions given in Table 9 rovv e AND f The minimum provisions for boller interlock zoning and time control and temperature control of the heating and hot vvater circuits as described in Table 10 should be met An acceptable alternative to these is any boiler management system that delivers the specified zoning timing and temperature and boiler interlock control provisions When oil boilers are installed as part of a replacement system the minimum level of system controls should be provided as described in Table 10 unless they are already installed and fully operational fan individual component of the control system is being replaced in an existing system for example a room thermostat it is not necessary to upgrade the system to meet the minimum requirements AND g Pipework should be insulated as described in Table 11 24 SUOHONAISUI S JOINJOeJNUeW y u p ul ds uunuulului e 10 slu uu uauinb i Aue UNA uonounfuoo uolnme no4io ul p piAoid q p nous AIEA SSEdAQ oewozne ue ssed q p duund A jnj o peyeAuod q pinous UOUSInOIO E JO UOUSISISUL siApe suon onu sui S JoINJOeJNUeW 19 10q au Ji q YAPJIB luu s UNA su
59. ach having separate on off electrical and warm timing controls and temperature controls water systems e Single storey open plan dwellings in which the living area is greater than 70 of the total floor area sub zoning of temperature control is not appropriate e Thick screed floor heating systems gt 65mm should have facilities for automatic setback of room temperature to a lower level at night or during unoccupied periods 4 Boiler control Warm water floor heating system controls should be wet systems only _ interlocked with the boiler and stored hot water temperature control to ensure that the boiler does not fire when there is no demand for heat for either space or water heating 55 Table 27 Minimum provisions for floor insulation and minimising distribution losses of vvet and electric underfloor heating systems Floor insulation and design for reducing distribution losses Minimum provision Supplementary information 1 Exposed ground floors Ground floors on earth or suspended floors in contact with outside air should be insulated to limit downward heat loss to not more than 10 W m resulting from thermal resistance of the applied floor finish ii When heat output is not known but the floor finish is specified the extra amount of system thermal insulation may be calculated using the sum ofthe thermal resistance of the floor finish and the thermal resistance of the underlying heated layer
60. ade The CO emission factors should be taken from Table 12 of SAP 20057 The aim is to discourage replacement of an existing appliance by a significantly less carbon efficient one Examples 1 An old oil fired boiler with an efficiency of 72 is to beTeplaced by a dual solid fuel boiler with an efficiency of 65 as required by paragraph a above and Table 16 The carbon equivalent efficiency of the dual solid fuel boiler should be greater than 70 to meet the requirement in paragraph b above Its carbon equivalent efficiency is actually 65 x 0 265 0 187 92 1 where 0 265 and 0 187 kg CO kWh are the emission factors for oil and dual fuel appliances respectively 2 An LPG fired boiler of 81 efficiency is to be replaced with an oil boiler The new oil boiler should have a an efficiency of not less than 86 see Table 9 and b a carbon equivalent efficiency greater than 79 the efficiency of the existing LPG boiler less 2 percentage points The efficiency of the proposed new oil boiler should therefore be greater than 79 0 234 0 265 79 0 883 89 5 where 0 234 0 265 kg CO kWh are the emission factors of LPG and oil respectively 2 The relevant column in Table 12 of SAP 2005 is the one entitled Emissions kg CO kWh 8 Section 1 5 Notification of building vvork VVork covered by requirement L1 in the 2006 amendment of Part L must make reasonable provision to achieve energy efficiency
61. all multiplied by a factor of 10 Supplementary floor heating system thermal insulation maybe supplied independently or added to the statutory insulation requirement iveNotwithstanding ii or iii above floor heating systems intended for cyclical operation or installed over unheated rooms should be separated from the structural floor by a layer of thermal insulation of at least 1 25 m2K W thermal resistance and installed below the heated plane 2a Intermediate floors with heated rooms below wet systems Intermediate floors with heated rooms below complying with both Part L and Part E of the Building Regulations should have a separating layer of system thermal insulation to comply with either 1 ii above or BS EN 1264 Part 4 where the minimum thermal resistance is given as not lessithan R 0 75 m K VV 2b Intermediate floors with heated rooms below electric systems Intermediate floors with heated rooms below complying with both Part Land Part E of the Building Regulations should have a separating layer of system thermal insulation where the minimum thermal resistance is given as not less than R 0 5 m k VV or comply with 1 ii above Thermal insulation of pariy floors is essential because the floor ceiling is directly coupled do the heating elements 3 System design to minimise distribution losses i Underfloor heating distribution boards or warm water distribution manifolds should be
62. alnOEIDUELU H lloq v 0 Osje pinous sl lleisul 9002 6659 Sg Ul UBAIB suu 1s s UOISSILULUOD pue zed ud o Moy uo BdUepPING y mollo 0 q pinom UOLS AOA g euose ti 5pnis pue ajeos Jo UOHEULO 9y pue 0150 102402 0 1in ql Aewnd y o peppe pinoys 1 azem eOlLu u2 e uu s Ss y Jo Du eut Buung Hoq MEU E DuEIsu 1no D sen pue pjnoys suu 1s s Hulyeay euog q 21 110155111102 lu uu1e 41 JOJEM pue ul 3s4S p b nunuo g lqeL 43 Table 19 Minimum provisions for system controls for solid fuel central heating systems in new dwellings System control Minimum provision for new systems Minimum provision for Supplementary replacement systems 1 information All appliances Thermostatic control of the burning rate Thermostatic control of except open the burning rate based fires on temperature of water in the boiler where the appliance uses a boiler Automatic feed appliances Zoning Dwellings with a total usable floor No minimum area up to 150m should be divided requirement but as far into at least two space heating zones asit is practicable and with independent temperature economic to do so control one of which is assigned to controls should be the living area upgraded to the levels Dwelli
63. ating this situation is also referred to in this section as a new system c The specification of a replacement central heating system and or component in existing dwellings where central heating is already installed this situation is referred to in this section as a replacement system In situations a and b above the guidance for compliance of new systems in new and existing dwellings with Part L is the same In situation c above that is for replacement systems in existing dwellings in most cases the guidance for compliance with Part L is as for new systems unless otherwise stated in the relevant section In order to comply with the requirements of Part L a central heating system using a solid fuel appliance which is provided as a new system or replacement system in dvvellings should meet all of the following conditions a The appliance should be from the HETAS categories D F G and J as defined in Table 16 AND b The appliance should have a minimum efficiency gross calorific value of no less than that specified in Table 16 for that category of appliance AND c The installer should confirm that the ratio of heat to room and heat to water is appropriate for the room and total property This will require reference to installation practice guidelines including calculation of room and property heat loss Advice on this is given in the HETAS Guide and website AND d The minimum provisions for system circulation should
64. ating and electrical performance of heat led micro cogeneration packages primarily intended for heating dwellings e Method to evaluate the energy performance of micro cogeneration heat led systems in dwellings e Appendix N of the UK Government s Standard Assessment Procedure SAP 2005 for the energy rating of dwellings Until thissguidance is available the following publication may be useful ODPM Publication Low or Zero Carbon Energy Sources Strategic Guide May 2006 68 Appendix A Assessing the case for a non condensing boiler 1 This Appendix sets out the approved assessment procedure for determining for the purposes of the requirement in Part L of the Building Regulations vvhere practical considerations mean that it vvould be reasonable to install a non condensing boiler 2 The chart summarises the steps in the assessment procedure In determining the position within a dwelling where a condensing boiler could be installed at lowest cost obstacles such as furniture or fittings should be ignored If the assessment shows that this cost is too high then in accordance with section 2 or 3 as appropriate of the Domestic Heating Compliance Guide it would be reasonable to install a non condensing boiler 3 Paragraphs 8 to 10 inADL1B give guidance on how to deal with historic buildings The assessment procedure 4 The assessment should be carried out following the detailed guidance given in the Guide to the
65. b The efficiency gross calorific value of the appliance should besno less than the value in Table 8 for that type of appliance Table 8 Minimum appliance efficiencies for gas fires used with back boilers British Standard designation appliance type Minimum efficiency Gross Calorific Value Natural gas LPG Inset live fuel effect 40 41 BS 7977 2 2003 Specification for safety and rational use of energy of domestic gas appliances Combined appliances Gas fire back boiler All types except inset live fuel effect 63 64 BS 7977 2 2003 Specification for safety and rational use of energy of domestic gas appliances Combined appliances Gas fire back boiler Supplementary information further guidance on gas fired heating Further guidance on gas fired heating systems is available in the following publications Energy Efficiency Best Practice in Housing publications CE30 Domestic heating by gas boller systems CE51 Central heating system specifications CHeSS CE54 Whole house boiler sizing method for houses and flats SBGI publications on gas boilers and gas fires under development at the time of writing See www sbgi org uk for updates CORGI publications Essential Gas Safety GID1 Gas Cookers and Ranges GID2 Gas Fires and Space Heaters GID3 Water Heaters GID5 Central Heating Wet and Dry GID7 Wet Central Heating System Design Guide V CH1 Warm Air Heating System Design Guide VVAH1
66. be met as given in Table 18 row a AND 40 e The minimum provisions for fuel storage should be met as given in Table 18 row b AND f The minimum provisions for hot water storage systems and labelling of storage vessels should be met as given in Table 18 row c AND g The minimum provisions for system preparation and water treatment should be met as given in Table 18 row d AND h The system should be commissioned in accordance with the minimum provisions given in Table 18 row e AND i The minimum provisions for control of the heating and hot water circuits as given in Table 19 should be met An acceptable alternative to these is any boiler management control system that meets the specified zoning timing and temperature requirements AND j Pipework should be insulated according to the minimum provisions given in Table 20 Supplementary information Turn down values the ratio of high to low output Turn down ratios are generally very good gt 10 1 for automatic feed appliances with small firebeds Turn down ratios are less good with large batch fed appliances unless the latter are used in conjunction with a hot water accumulator Automatic appliances are likely to require less frequent refuelling Automatic e g electric or gas ignition is now available for certain designs and reduces energy usage at times of low demand allowing boiler interlock Some boilers have both auto ignition and fire extinguishing
67. c micro combined heat and power 68 Appendix A Assessing the case for a non condensing boiler 69 Section 1 ntroduction Part L of Schedule 1 to the Building Regulations is concerned with the conservation of fuel and povver in buildings For dvvellings Part L is supported by tvvo Approved Documents Approved Document L1A ADL1A and Approved Document L1B ADL1B In addition to Part L other Building Regulations also bear on the energy performance of dwellings and their heating systems ADL1A gives guidance on how to satisfy the energy performance provisions of the Building Regulations for new dwellings ADL1B gives guidance on how to satisfy the energy performance provisions of the Building Regulations for work in existing dwellings Both Approved Documents repeat the relevant regulatory requirements verbatim in various places distinguished by a green background with the aim of making them complete references for ordinary purposes In cases of doubt however it may be necessary to refer directly to the Building Regulations as amended ADL1A and ADL1B were published in 2006 in support of the amendment to the Building Regulations SI 2006 652 The amendment came into f rce on 6 April 2006 These new Approved Documents are more strategic in nature and rely on second tier documents to provide detailed information on the minimum provisions necessary to comply with the requirements of the Regulations This Domestic Heating Complian
68. ce Guide is a second tier document referred to in ADL1A and ADL1B as a Source of guidance on the means of complying with the requirements of the Building Regulations for space heating systems and hot water systems The guide was prepared with the assistance of industry bodies It covers conventional means of providing primary and secondary space heating and domestic hot water for dwellings in use in England and Wales at the time of writing The guide identifies standards of provision that meet the requirements for systems in new build and those in existing buildings when work is being undertaken For new dwellings guidance is provided on the design limits for fixed building services referred to in ADL1A For existing dwellings guidance is provided on reasonable provision for the installation or replacement of controlled services as referred to inADL1B The levels of performance for new and existing dwellings differ only where practical constraints arise in existing dwellings Figure 1 Status of the Domestic Heating Compliance Guide Legal requirements 1st Tier 2nd Tier 3rd Tier in the Building Regulations and Part L of Schedule 1 Approved Document Part L 1A amp 1B Domestic Heating Compliance Guide nd stry guides good practice guides codes of practice and standards The Domestic Heating Compliance Guide covers a range of frequently occurring situations but alternative means of achieving compliance
69. condensing boilers A flue passing through a wall or floor that must not be pierced for structural reasons An internal flue extension exceeding 4m ignoring the part that passes through a loft attic space A flue that passes through another dwelling or another building in different ownership or another fire compartment A vertical flue pipe visible on the outside of the building facing the main approach direction usually the front This refers only to the flue pipe not the flue terminal a terminal may be positioned n any side of the building Wall terminals that discharge under the roof of a car port Wall terminals with horizontal discharge less than 2 5m from any wall fence building or property boundary facing the terminal Wall terminals with horizontal discharge less than 2 5m from a car parking space and less than 2 1m above the ground Wall terminals less than 2 1m above the ground with horizontal discharge of the flue products across a public footway route or a patio hard surface area Table A2 Boiler positions NOT to be considered 1 Gas boiler Where the boiler or extended internal flue is in a e lounge e lounge dining room e principal living room that does not include a kitchen area 2 LPG boilers Where the boiler or extended internal flue is in a e lounge lounge dining room e principal living room that does not include a kitchen area cellaror basement 3 Oil b
70. considered as part of the overall design of the building For works on heating and hot water services systems in existing dwellings provision can be considered in isolation Both Approved Documents refer to this publication as the source of detailed guidance on what is reasonable provision Section 1 4 Replacement of primary heating appliances In order to comply with the energy efficiency requirements of the Building Regulations replacement appliances providing primary space heating and or hot water in existing dwellings should meet the following conditions Replacement not involving fuel or energy switch Where the primary heating appliance is replaced by one using the same fuel or energy suppi y the seasonal efficiency of the new equipment should be a as stated in the relevant fuel based section of this ouide AND b not worse than two percentage points lower than the efficiency of the controlled service being replaced If the efficiency of the appliance to be replaced is not known efficiency values may be taken from Table 4a or 4b of SAP 2005 Replacement involving fuel or energy switch If the new heating appliance uses a different fuel the efficiency of the new service should be multiplied by the ratio of the CO emission factor of the fuel used in the service being replaced to that of the fuel used in the new service to obtain the carbon equivalent efficiency The checks described in paragraphs a and b above should then be m
71. ctical 2 5 Gas fired fixed independent space heating appliances This section provides guidance on the specification of gas fired fixed independent space heating appliances for dwellings Fixed independent space heating appliances may be installed as a means of primary or secondary space heating 19 Gas fired fixed independent appliances for primary space heating In order to comply with the Building Regulations energy efficiency requirements gas fired fixed independent space heating appliances in new and existing dwellings which are provided as the primary heat source should meet the following conditions a The appliance should be one of the types described in Table 6 AND b The efficiency of the appliance gross calorific value should be no less than 58 The appliance manufacturer s declaration of appliance performance shall include the following words The efficiency of this appliance has been measured as specified in insert appropriate entry from Table 6 and the result is x The gross calorific value of the fuel has been used for this efficiency calculation The test data from which it has been calculated has been certified by insert name and or identification of Notified Body The efficiency value may be used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings AND c In new dwellings each appliance should be capable either independently or in conjunction with room
72. d secondary space heating and hot water Section 4 Electric primary and secondary space heating and hot water Section 5 Solid fuel primary and secondary space heating and hot water e Specialist technology specific sections Section 6 Community heating Section 7 Underfloor heating Section 8 Heat pumps Section 9 Solar water heating Section 10 Micro CHP Combined Heat and Power For any particular application the relevant fuel based section and or specialist technology specific section must be read in conjunction with this introduction and the following generic sections Section 1 Introduction Section 1 1 How to use this guide e Section 1 2 Glossary e Section 1 3 The Building Regulations requirements and the guidance in Approved Documents L1A and L1B e Section 1 4 Replacement of primary heating appliances Section 1 5 Notification of building work For each type of space heating or hot water system guidance on the minimum provisions needed to comply with Part L is supported by commentaries in italic font with a shaded background These commentaries are labelled Supplementary Information and may be useful when interpreting the minimum provisions and in some cases provide links to best practice guidance They do not specify minimum provisions Figure 2 Structure of the Domestic Heating Compliance Guide Section 1 Section 6 Introduc
73. e 181 SIBPUI AD 5 olluoo juseainba ue o JO snes wiy p l siS l Sg e Se yons 19npoid y uo pinoys suapul Ad JOY J9ddod Doan MA ul SUBULOH 1894 e ep uA ul sso yeay DUIDUEIS sou u AHoedEo EU L OU I SS A Jo dA suajeay UOIPEUUOJU BUIMO O 4ajem 6 D SO 2 p e y AjjJIaJ PU y UUM e p nous S SS A 15 JOU V a 40 uoweoyioads Ajddns 1942M 1682 1 NI 58 J pulj o y JO ped 1972m 104 JO Sy SI A AeP U gt spou 8uu 1S pue slu uu uJzImnb t si pul 35 zzAVS 0 2701 x 9 Buip Sx jou 850 Wal e uonippe u do s sodund S ns uiop ul pue g61 Sg YUM p nous sJepul AD uoneulqulo p 10 S4 pUl 10 1BAAOD ZOO7 99SL sg 50 15 EUL U JO 54 8221 10 05 BOUBWOPEd 8100585 sp4epue 1s ysnug SJOINJOPJNUL 4 YB H 4 1EAA OU JO zeck JO S SUOHO S Jo s u w nb UOI E NSU y 422W pinoys suu Ss s ofpios HMewd 2 uny EUL MVYn O 1 US HuljeaysajeEM MMM S310 S suoneym6b k 18114011 4o UotpOutOede BOUeULIOLIad y UA se Apog p 1Ip J52e Jayjoue Aq Data q ll uonproossy siainjoesnueyy 4 B H 5 A HO ll9gunoo uoie
74. e and back boiler unit and then oniy when the criteria of the Condensing Boiler Installation Assessment Procedure are satisfied as outlined in Appendix A of this document In order to comply with the requirements of the Building Regulations the gas fire provided as a secondary heat source as part of a combined fire and back boiler unit when provided as a replacement system in existing dwellings should meet the following conditions 4 At the time of writing prEN 14829 is in draft but it may not appear as a European standard The type of appliance for which this standard is proposed is on the market having been certified as complying with the essential requirements of the Gas Appliance Directive The BSI is producing a parallel UK safety installation standard for appliances designed to comply with prEN 14829 21 a The appliance should be one of the types described in Table 8 the appliance manufacturer s declaration of appliance performance shall include the follovving vvords The efficiency of this appliance has been measured as specified in insert appropriate entry from Table 8 and the result is x The gross calorific value of the fuel has been used for this efficiency calculation The test data from which it has been calculated has been certified by insert name and or identification of Notified Body The efficiency value may be used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings AND
75. e following details of the solar system e Net or aperture area of solar collector e Minimum ambient temperature without freeze damage to components e Location and method of controlling over pressure Location of the electrical isolating switch Type of circulation fluid Circulation rate of collector circuit Location of device for overheating protection of solar heated water A signed commissioning certificate certifying that the equipment is safe legal and fit for its intended purpose should be handed over to the dwelling owner and or user as applicable A separate certificate is required to cover the installation and commissioning of the hot water storage vessels and or appliances within a solar DHW system e A commissioning engineer should be a competent person who can personally testify by signature and date that the equipment is commissioned 3 Documentation No minimum requirement Information concerning the solar DHW system should be provided to the dwelling owner and or user as applicable The documentation should include e User s manual e Warranty information e Arecommended maintenance schedule e Commissioning certificate e Full contact details of the installer 65 Table 33 Minimum provisions for insulation of pipes for solar hot vvater systems Minimum provision Supplementary information For nevv or replacement solar heated vvater storage pipes connected
76. er circuits should be insulated wherever they pass outside the heated living space or through voids which communicate with and are ventilated from unheated spaces e Primary circulation pipes for domestic hot water circuits should be insulated throughout their length subject only to practical constraints imposed by the need to penetrate joists and other structural Where insulation is labelled as complying with the Domestic Heating Compliance Guide it must not exceed the following heat loss levels elements Pipe diameter OD Maximum permissible All pipes connected to hot water storage vessels mm heat loss including the vent pipe should be insulated for at W m least 1 metre from their points of connection to the eylinder should be insulated up to the point 8 7 06 where they become concealed 10 7 23 e f secondary circulation is used all pipes kept hot 3 by that circulation should be insulated 12 7 35 For replacement systems whenever a boiler or hot 15 7 89 water storage vessel is replaced in an existing system 99 9 12 any pipes that are exposed as part of the vvork or are othervvise accessible should be insulated as 28 10 07 recommended above or to some lesser standard 35 11 08 where practical constraints dictate i 42 12 19 54 14 12 In assessing the thickness of insulation required to meet the provision standardised conditions should be used in all compliance ca
77. eul o p nous UODEIDLLUOL 1U uu1e 1 1972M 601 e uu ls s y Jo Du ISO Bung q 19 eM pue y Jo lloq q oN SUH S S MAU JO p ulJ p SY Mou E Bull e su p usnil pue p ueajo uSnolou Pinoys s l s s S ne q fenu 6 uu ls s q uonel nouio5 peduund Ilni o aq p nous 46 10 5 UTAN p sn p nous A gA ssed q suu 1s s Bullsix p sejd ase si loq uSuAA ue uay ssed Qq E Jo UOUEIEISUL S APE suol onulsui 5 ajo 2u J q padwnd Ajjnyeney SUH S S M U JO p lJ p sy pinoys meu Ul syno Avewhdueyem joy oljsewop pue Duugau eoeds Jo 5 8 6 uu 1s s e UOHEUUOI Apuauatddne 5 5 1u uu 2opjd 10 uoisiAo1dunuulul j SUMH S S M U 410 uolslAOid ySW9 SAs Bunp uv iE nu JOM 911153 9 JO 01 U09 uu 1s s pue uluolssiudulo pue uoneBued id uu 1s s l S4S 10 SUOISIAOIG WNWIUIN ZL lQEL 33 6 yoolui lui ayeudoudde u pue pue Buru Buluoz p ll ds ay s1 uu yeu Wa SAs Ionuoo 1 io Aue s 5111 0 uv SUH 3S S M U 10 sv
78. f the carbon intensity of the scheme should be carried out Emission factors should be determined based on the particular details ofthe scheme but should take account of the annual average performance of the whole system i e the distribution circuits and all the heat generating plant including any CHP and any waste heat recovery or heat dumping The calculation of the Dwelling CO Emission Rate should be carried out by a suitably qualified person detailing how the emission factors were derived AND d The minimum provisions for system controls within dwellings should be met as given in Table 23 AND e The minimum provisions for insulation of pipework should be met as given in Table 25 Table 21 Minimum provisions for the design of new community heating systems to maximise efficiency of heat generation and minimise energy use by pumps Minimum provision Supplementary information 1 Boilers for CH Boiler only community heating systems for new dwellings may be used provided that The Carbon emissions calculated comply with the target carbon emissions rate Boilers should be selected to comply with the boiler efficiency requirements of the Part L Non Domestic Heating Cooling and Ventilation Compliance Guide e When calculating the carbon emissions rate the type and quantity of fuel used and also the electricity needed to operate the central plant and pumps should be taken into account For systems using conde
79. fficiencies However they are able to burn wood logs with correspondingly low B1 B2 and B3 can be fitted net carbon emissions It must be stressed that large open fires with large free face areas see Note 1 usually have ventilationrequirementswwell in excess of that available in a property built to modern standards of air tighiness This is likely to lead to severe operationalproblems unless special steps are taken to provide the required air supply The use of such large simple open fires is penalised in the SAP calculations Note 1 The free face area of an open fire is its opening width times opening height see Approved Document J for further details 46 Controls for solid fuel appliances providing secondary heating V herever possible solid fuel appliances should have thermostatic control these are usually integral to appliances in categories E F and G Controls should be appropriate to the level of sophistication of the appliance automatic appliances can benefit from advanced controls Provision of fuel storage for solid fuel appliances providing secondary heating The quantity of fuel consumed by secondary heating appliances is likely to be less than 1 tonne per year Hovvever it should be stored in a dry and convenient location Smoke control areas The location of the appliance within or without a smoke control areais Critical to the process of optimising the choice of appliance and fuel For further informatio
80. flueless space heaters this type of appliance are not for nominal heat input not exceeding 6 kW specified as all the heat produced by the combustion process is released into the space to be heated In SAP 2005 the efficiency of these appliances is classed as 90 and an adjustment is made for ventilation in the space heating requirement calculation Flue less BS EN 449 2002 Specification for dedicated liquefied petroleum gas appliances Domestic flueless space heaters including diffusive catalytic combustion heaters 2 6 Gas fired fixed decorative fuel effect fires This type of appliance is intended for decorative purposes and therefore a minimum thermal efficiency is not specified Note that thespurposes of SAP 2005 the efficiency of decorative fuel effect fires is classed as 20 for use in the space heating requirement calculation See Table 4a of SAP 2005 n order to compiy vvith the requirements of Part L gas fired decorative fires in nevv and existing dvvellings should meet the follovving conditions a The appliance should meet the product standards specified in BS EN 509 2000 Decorative fuel effect gas appliances AND b No more than one appliance should be installed per 100m of dvvelling floor area 2 7 Gas fire for secondary space heating provided as part of a combined fire and back boller unit A combined fire and back boiler unit can only be installed as a replacement for an existing combined fir
81. g systems in existing dwellings where previously space heating was not provided by central heating this situation is also referred to in this section as a new system c The specification of a replacement central heating system and or component in existing dwellings where central heating is already installed this situation is referred to in this section as a replacement system In situations a and b above the guidance for compliance of new systems in new and existing dwellings with Part L is the same In situation c above that is for replacement systems in existing dwellings in most cases the guidance for compliance with Part L is as for new systems unless otherwise stated in the relevant section In order to comply with the requirements electric boilers serving central heatingywhich is provided as a new system or replacement system in dwellings should meet the following conditions a The minimum provisions for system circulation given in Table 12 row a should be met AND b The minimum provisions for system preparation and vvater treatment given in Table 12 row b should be met AND c The system should be commissioned in accordance with the minimum provisions given in Table 12 row c AND d The minimum provisions for boiler interlock zoning and time control and temperature control of the heating and hot water circuits as given in Table 12 row d should be met An acceptable alternative is any boiler management
82. g certain types of solid fuel appliances This section provides guidance on the specification of fixed solid fuel heating systems for dvvellings The guidance given in this section covers the following types of solid fuel appliances used to deliver primary heating as part of a central heating system Batch fed open fires with high output boilers appliance types D1 D4 in Table 16 Batch fed and automatic feed room heaters and stoves with boilers appliance type F in Table 16 Batch fed cookers with boilers not exceeding 7 5kW appliance types G1 and G2 in Table 16 Batch fed independent boilers and automatic feed anthracite and wood pellet independent boilers appliance types J1 J5 in Table 16 Unless stated otherwise the guidance in this section applies equally to appliances that burn wood wood pellets house coal manufactured smokeless fuels and anthracite Where appropriate it will also be necessary to refer to the sections on community heating under floor heating solar vvater heating and micro CHP Terminology and applicability of guidance to different scenarios in new and existing dwellings The guidance in this section applies to the following situations a The specification of central heating systems in new dwellings this situation e referred to in this section as a new system b The specification of central heating systems in existing dwellings where previously space heating was not provided by central he
83. given in Table 2 for gas fired central heating systems An acceptable alternative to these is any boiler management system that delivers the specified zoning timing and temperature provisions When gas boilers are installed as a replacement for existing boilers the minimum level of system controls should be provided as described in Table 2 unless they are already installed and fully operational lf an individual component of the control system is being replaced iman existing system for example a room thermostat it is not necessary to upgrade the system to meet the minimum requirements AND e Pipework should be insulated as described in Table 3 2 4 Gas fired warm air heating This section provides guidance on the specification of gas fired warm air heating systems for dwellings Terminology and applicability of guidance to different scenarios in new and existing dwellings The guidance in this section applies to tbe following situations a The specification of gas fired vvarm air heating systems in new dwellings this situation is referred to in this section as a new system b The specification of gas fired warm air heating systems in existing dwellings where previously space heating was not provided by a warm air system this situation is also referred to in this section as anew system c The specification of a replacement warm air heating system and or component in existing dwellings where warm air heating is already installed
84. ific Value should b not less than 60 The appliance manufacturer s declaration of appliance performance shall include the following words The net efficiency of this appliance bas been measured and the result is x The test data from which it has been calculated has been certified by insert name and or identification of Notified Body ethe efficiency value when converted to gross by use of the appropriate conversion factor from Table E3 in SAP 2005 may be used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings AND b Each appliance should be capable either independently or in conjunction with room thermostats or other suitable temperature sensing devices of controlling the temperatures independently in areas that have different heating needs e g separate sleeping and living areas Oil fired fixed independent appliances for secondary heating In order to comply with the Building Regulations energy efficiency requirements oil fired fixed independent space heating appliances in nevv dwellings which are provided as the secondary heat source should have a minimum efficiency gross calorific value of not less than 60 Supplementary Information Further guidance on oil fired heating systems is available in the following publications Energy Efficiency Best Practice in Housing publications see www oftec org CE29 Domestic heating by oil boiler systems CE51 Central heating system specificat
85. ing Compliance Guide will not exceed the following heat loss values Pipe diameter OD Maximum permissible mm heat loss W m 8 7 06 10 7 23 12 7 35 il 7 89 22 9 12 28 10 07 35 11 08 42 12 19 54 14 12 Further assistance in convertingsheatloss limits to levels thickness of insulation for specific thermal conductivities is found in the TIMSA HHVAC Guidance for achieving compliance with Part L of the Building Regulations Insulation for pipework in unheated areas Extra provision may need to be made to protect water carrying pipework in unheated areas against freezing Further guidance is available in BS 5422 2001 Method for specifying thermal insulating materials for pipes tanks vessels ductwork and equipment operating within the temperature range of 40 C to 700 C e BRE Report No 262 Thermal insulation avoiding risks 2002 Edition 66 Supplementary information on solar vvater heating Energy Efficiency Best Practice in Housing Solar Water Heating systems Guidance for Professionals CE131 CIBSE Solar Heating Design and Installation Guide ISBN 978 1 903287 84 2 Central Heating System Specifications CHeSS 2005 CE 51 GIL59 Glossary of standards relevant to solar hot water heating BS 7431 1991 Method for assessing solar water heaters Elastomeric materials for absorbers connecting pipes and fittings BS 6785 19
86. ions CHeSS CE54 Whole house boiler sizing method for houses and flats OFTEC Technical Books 2 3 4 and 5 see www oftec org BS 5410 31 Section 4 Electric heating systems This section provides guidance on the specification of fixed electric heating systems for dvvellings 4 1 Scope of guidance The guidance given in this section covers the following types of fixed electric heating systems e Electric boilers serving central heating systems e Electric warm air systems e Electric panel heaters e Electric storage systems including integrated storage direct systems Portable plug in appliances are not covered by the Building Regulations or by this guide It should be noted that fixed electrical installations in dwellings should comply also with Part P Where appropriate it may also be necessary to refer to the other sections in this guide covering under floor heating and solar water heating 4 2 Electric boilers serving central heating systems in new and existing dwellings This section provides guidance on the specification of electric boilers serving wet central heating systems for dwellings Terminology and applicability of guidance to different scenarios in new and existing dwellings The guidance in this section applies to the following situations a The specification of central heating systems in new dwellings this situation is referred to in this section as a new system b The specification of central heatin
87. isse s YOIUM Jo uo OJ UOD y pu d pul yym s uoz Sune v eoeds OM SE9 12 Olul PEPIAIP PINOYS ZWIQG 0 dn ease 1004 5 Ie101 e YUM SBUH AAQ Buluoz ep b nunuo z lqeL 34 Table 13 Minimum provisions for hot vvater storage for electric vvet central heating systems Minimum provision for nev systems and replacement systems Supplementary information Vented systems including cylinders heated primarily by electricity Vented copper hot water storage vessels should comply with BS 1566 or BS 3198 ii Vented cylinders in materials other than copper should also be labelled as complying with the heat loss requirements of BS 1566 Cylinders heated primarily by electricity should be insulated such that the heat loss does not exceed the value given by the formula 1 28 x 0 2 0 051V7 kWh per 24 hours where V is the nominal cylinder capacity in litres This applies to electrically heated combination units as well as other electrically heated cylinders Unvented systems including cylinders heated primarily by electricity iv Products should either comply with BS EN 12897 OR be certified by the British Board of Agr ment Water Research Council or other accredited body as complying with Building Regulations Cylinders heated primarily by electricity should be insulated such that their heat loss does not exceed the value given by
88. iuols Oy p lu Aun q z2002 99S Sq 10 siu uu unb i saBUeYOXS 1894 pu SOL Ia au ldtuoo p nous S SS A apos 1 7em 104 Jeddoo p t k E sBuIll AAp Bunsix pue Mau u sui s s M U 40 UOISIAOJd WNWIUIN Beiols BA 1 5 p nunuo 6 lqeL 26 suompjn5B tJ yum ueduioo SI uoneJ e Sui v yey IUDBIS o 01 42 w04 sn pinous s4a jezsul p v s B z 24140 2 plOU Snou ey 40 ays uo do e BulAB 102 sn 81 BuluolIssiuuuuo2 61 21 uongisdo JUSIOYJO 104 EDD SI 56 INO paleo aq skemje UO U JO JUBLUBDUSLULWOD y o JOLd joao Dumping Ainou pinoys yom y 1 01551 UOSJOd y JO esu y suonemn ki Buipiing U110 7 Hed Jo s sodind y uosi d 1 e p J 1s 6 4 1ou J D plAO1d H UAA yenueuu sjeinjoesnuew v S lpny ul sasn y o uonels do SU pue uu 1s s y uol gue dx in e auf pinous 21541 SUL waishs 15 joy 10 pue i jioq 9y o 1 85 aq Wa 54010 5 1 suon on nsul 5 y YUM SCOUEDIOOOE ul PSUOISSILULUOD q pinous 1lu uudinb v1 sionuo pue sduind HOAM dId se yons 1u uudinb p eroossE y m 1841960
89. jj qej aq pjnoys uononsuoo J ddo ou ase YOIYM SJEapul AD 010425 Ionuoo Juaeainba ue 85u J J J JO snjejs Wy 191 UELL ISG e se yons y uo Buljjaqe seaj9 Aueo pinoys 10 4addod S O S ELUJOY 10 SUOIJEDIIO9ds 1 55 24 JO zrek JO LE 54011095 Jo 51 uonpinsul y JEBEL pinous suu 1s s apos Mewld 2 un BulAldulo se Apog papae wayjoue Aq HO 104 0 187e My Ueleg Jo peog 5116 v Aq D LM HO 6821 NI 98 UA MIO plnous sjonpoud uu 1s s 1372m JOY q 2002 1 9991 Sg 40 slu ul uinb J JeBueyoxe 1e u Sune v dnyoeq pue 590 yeay ay Ul idulo pjnoys sjass a apeos Jop JOY Jeddoo Deen e SANO OJ Sp ag SUOISIAOIG v 1 1942M pazeay JejOS 1 10 104 16 Ja eM p 1e u sejosg J LE lqeL 64 Table 32 Minimum provisions for labelling commissioning and documentation for solar hot vvater systems Minimum provision Supplementary information 1 Labelling of solar collectors and hot vvater stores a All solar collectors should have a visible and durable label disp
90. l sAs Sul 3s4S Dungau IE nu p uj seB Jo 01 U09 10 SUOISIAOIG WNWIUIN Z QEL 15 Table 3 Minimum provisions for insulat heating systems Minimum provision ion of pipes serving gas fired central Supplementary information n nev systems pipes should be insulated to comply vvith the maximum permissible heat loss indicated in the Supplementary Information column and labelled accordingly as follows e Primary circulation pipes for heating and hot water circuits should be insulated wherever they pass outside the heated living space or through voids which communicate with and are ventilated from unheated spaces Primary circulation pipes for domestic hot water circuits should be insulated throughout their length subject only to practical constraints imposed by the need to penetrate joists and other structural elements All pipes connected to hot water storage vessels including the vent pipe should be insulated for at least 1 metre from their points of connection to the cylinder or hey should be insulated up to the point where they become concealed If secondary circulation is used all pipes kept hot by that circulation should be insulated For replacement systems whenever a boiler or hot water storage vessel is replaced in an existing system any pipes that are exposed as part of the work or are otherwise accessible should be insulated as recommended above or to some lesser standard where practical c
91. l s n A uyqo Aou l l y J paveda Dua soles Dai SpE g g uoll98S ul se pin us sa yoo sue 8049 ainjesayy siainjoejnueyy p yonuoo ul Jo A U L H EUOSE S y uey y m PSUIQUUOD ae ey si jioq Bulyeay 104 AoUet2ule oul uon npold ul 4a6uo ou ave yoiym Auew se au 4 NO Slulod BHe UIsdIEd OM UEU JOU HO pam OdT 19608 Uey se su Jioq ajqejiene JSOW UO uopewozui parepdn CNV suu 1s s Mau 10 peuljap SE SS JOU JO paulj seb jeunyeu J 87 Ue SS 104 q pinoys anjen s pnyoul pue Gin Bio ssajliog mmm q pinoys ynaq4s u r l 49 10 v JUSLUNDOP 5 1 1 40 v xipu ddy UIIUO ajgeyiene SI SEQE1EQ U lOLL4 19 109 SU yu t dinb mau y Jo AOuetulag jeuose s _UlPSUlJap SeoUe SLUNDIIO feuond x y ul s5ull Ap Sunsix ul q Aou r M up ldde ue A u l ul YoUMS Yonen ajqeyda00e ynga3s u1 Bu Jn1u pi uo 10 f n e 1ou slu uu Seld ti y nqq48S 98 uey Sea 104 plnous v l lH l lloq oul e DIN P Sunsix u sBuljamp uoneuuo ul Aieyuawajddns swia sAs 1u uu 2pida 10 UOISIAOId WNWIUIN Suhsix pue Mou ul SU SAS M U 40 UOHS AO WNWIUIN p uij se6 yo HuIUOISSIWIWOS pue uonep ed ld uu 1s s 15 1 BAL 104
92. laying all information required according to BS EN 12975 and including at least the follovving e Name of manufacturer Collector type Serial number Year of production Gross area of collector Aperture area of collector Net absorber area of collector Maximum operation pressure Stagnation temperature at 1000VV m and 30 C Volume of heat transfer fluid e Weight of empty solar collector e skabelling of solar heated water storage vessels within solar DHW systems All hot water storage vessels should carry a label with the following information e Manufacturer s name Nominal overall capacity in litres Dedicated solar capacity in litres Standing heat loss in kWh day Type of vessel Backup heating heat exchanger performance in kW where present Solar heating heat exchanger performance in kW In addition to the minimum provision for labelling of hot water storage vessels labelling with the following information is also recommended e Total net fluid content of secondary volume normally heated by each heat exchanger where present 1 0 litre maximum pressure and surface area of all heat exchangers 2 Commissioning A signed and dated commissioning certificate shouldbe completed to confirm that the equipment has been correctly installed and to record key safety and operational features As a minimum the commissioning certificate should record th
93. lculations based in this instance on a horizontal pipe at 60 C in still air at 15 C Further assistance in converting these heat loss limits to levels thickness of insulation for specific thermal conductivities is found in the TIMSA HVAC Guidance for achieving compliance with Part L of the Building Regulations 4 3 Electric heating systems other than central heating sing electric boilers The guidance given in this section covers the following types of fixed electric heating systems e Electric warm air systems Electric panel heaters e Electric storage systems including integrated storage direct systems Portable plug in appliances are not covered by this guide In order to comply with the requirements fixed electric heating systems other than electric boilers in new and existing dwellings should meet the following conditions a Electric warm air systems should meet the minimum requirements for zone control and time and temperature control of the heating system as set out in Table 15 row a 36 b Panel heaters should meet the minimum requirements for local time and temperature control of the heating system as set out in Table 15 rovv b c Storage heaters should meet the minimum requirements for charge control and temperature control of the heating system as set out in Table 15 rovv c Table 15 Minimum provisions for primary and secondary electric heating systems other than electric boilers
94. liances that are provided in new and existing dwellings for primary heating should have a minimum efficiency gross calorific value no less than specified in Table 16 for that category of appliance Table 16 Solid fuel appliance categories and minimum efficiencies Category Appliance description Minimum efficiency Feed gross calorific value Bi Open fire inset 37 Batch B2 Open fire freestanding 47 Batch convector B3 Open fire inset convector 45 mineral fuels 43 vvood C1 2 Open fire and boiler 50 Batch inset or freestanding D1 2 3 Open fire high output boiler 63 Batch trapezium D4 Open fire high output boiler 63 Batch rectangle E1 Dry room heater often known 65 Batch automatic as dry stove E2 Logs only 65 Batch E3 Multi fuel 65 Batch E4 Pellet stove 65 Auto F Room heater with boiler 67 Batch automatic G1 Cooker with boiler not 50 boiler only Batch exceeding 3 5kW G2 Cooker with boiler 60 boiler only Batch 3 5 to 7 5kVV J1 2 3 Independent boiler batch fed 65 Batch J4 Independent boiler 70 rising to above 20 5kW Auto anthracite 75 J5 Independent boiler 65 Auto wood logs pellets chips 38 Supplementary information on solid fuel appliances Minimum efficiencies The minimum efficiencies for solid fuel appliances are published by the Heating Equipment Testing and Approval Scheme HETAS in the Official Guide t
95. lings the minimum provisions for control of the system should be met as given in Table 23 AND d The minimum provisions for hot water production storage and treatment should be met as in Table 24 rows d1 and d2 AND e The minimum provisions for the installation of heat meters should be met as given in Table 24 row e AND f The minimum provisions for commissioning of the system should be met as given in Table 24 row f AND g The minimum provisions for insulation of pipework should be met as given in Table 25 48 Minimum provisions for connection of dvvellings to an existing CH scheme In order to comply with the requirements of Part L when new or existing dwellings are connected to an existing CH scheme the following conditions should be met a Where existing CH systems are in need of replacement or improvement a specific study should be carried out to assess the economic and environmental benefits of a range of options including the use of CHP and other low carbon heat sources especially where individual heating systems are being considered as an alternative to continuing with the CH system AND b Where boilers will be replaced in existing CH systems the requirements of the Part L Non Domestic Heating Cooling and Ventilation Guide should be followed for replacement boilers with respect to boiler efficiency AND c If thermal energy is purchased from an existing district or Community heating system an assessment o
96. low should be maintained through the heat pump Installation should be carried out by an installer approved by the manufacturer Installation that requires access to the refrigeration circuit or the connection of split systems should be carried out by a competent refrigeration and air conditioning engineer holding a refrigerant handling certificate and preferably an engineering services skillcard TIMSA HVAC Guldance for Achieving Compliance with Part L of the Building Regulations 60 Table 30 continued b Controls Heat pump unit controls should include e Control of room air temperature if not provided externally e Control of outdoor fan operation for air to air units Defrost control of external airside heat exchanger for air to air systems e Control for secondary heating if fitted on air to air systems e Control of external water pump operation for ground to air and water to air systems Protection for high water temperature Protection for high refrigerant pressure Protection for indoor air flow failure Protection for externalair flow failure on air to air units e Protection for water flow failure on ground to air and water to air systems External controls should include e Room thermostat if not provided internal to the heat pump to regulate the space temperature and interlocked with the heat pump unit operation e Timer to optimise operation of the heat pump
97. mation about the use of room heater provided by appliance manufacturer controls should be clearly stated in the manufacturers literature Electrically operated modulating 1 The integral and or remote thermostatic appliance e g room heater controls as provided or specified by the appliance manufacturer Automatic ON OFF vaporising appliances a Room heater providing The integral thermostatic controls as secondary room space heating provided by the appliance manufacturer b Room heater providing domestic The integral and or remote thermostatic hot water and secondary room controls as provided or specified by space heating the appliance manufacturer 5 SEDBUK efficiency values can be found in the Government s Standard Assessment Procedure for Energy Rating of Dwellings 2005 edition www bre co uk sap2005 30 3 5 Oil fired fixed independent space heating appliances This section provides guidance on the specification of oil fired fixed independent space heating appliances for dvvellings Fixed independent space heating appliances may be installed as a means of primary or secondary space heating Oil fired fixed independent appliances for primary heating In order to comply with Part L oil fired fixed independent space heating appliances in new dwellings which are provided as the primary heat source should meet the following conditions a The efficiency of the appliance gross calor
98. ms required for warm water systems connected to any high vvater temperature heat supply i e operating at more than 60 C e Mixed systems containing both radiators and floor heating connected to a common high vvater temperature supply i e operating at more than 60 C should be provided vvith a separate means of reducing the vvater temperature to the floor heating system 2 Room temperature Each room should have its own temperature control control device hovvever it may be acceptable for adiacent electric and vvet rooms vvith similar function to share a thermostat or floor heating sensor e g separate kitchen and utility areas systems e Bathrooms or en suites which share a heating circuit with an adjacent bedroom will provide heat only when the bedroom thermostat is activated In such cases the bathroom or en suite areas should De ftted with an independent towel rail or radiator e Weather compensating controllers should be installed 3 Time control Dwellings with total usable floor area up to 150m Facilities for automatic electric and wet should be divided into at least two zones with setback of room floor heating independent temperature control one of which is temperature to a lower systems assigned to the living area level at night or during Dwellings with a total usable floor area greater unoccupied periods are than 150m should be provided with at least two recommended for both space heating zones e
99. n in Table 1 row b need to be met AND c The minimum provisions for hot vvater storage and labelling of storage vessels as given in Table 1 rovv c need to be met AND d The minimum provisions for system preparation and vvater treatment as given in Table 1 rovv d should be met AND e The system should be commissioned in accordance vvith the minimum provisions given in Table 1 rovv e AND f The minimum provisions for boller interlock zoning and time control and temperature control of the heating and hot water circuits as described in Table 2 should be met An acceptable alternative to these is any boiler management system that delivers the specified zoning timing and temperature and boiler interlock control provisions When gas boilers are installed as part of a replacement system the minimum level of system controls should be provided as described in Table 2 unless they are already installed and fully operational If an individual component of the control system is being replaced in an existing system for example a room thermostat it is not necessary to upgrade the system to meetithe minimum requirements AND g Pipework should be insulated as described in Table 3 uoneinollo p du nd IIn o q pinous SUO ONIISU 5 v u p ll ds Uu Duet did uunuululuu JOJ slu uu uinb i Aue UNA uonounfuoo ul peplAosd Pinoys A 8A ssed4q olye
100. n ofiappliance burners not exceeding a net heat performance should include the following words input of 70 kW P L BS EN 483 2000 Gas fired central Combined warm air unit and circulator heating boilers Type C boilers of This product has been assessed against the test nominal heat input not exceeding methods setout in BS EN 778 1998 or 70kW BS EN 1319 1999 as appropriate and BS EN 4893 and certified as meeting those minimum requirements by insert name and or identification of Notified Body Warm air unit alone This product has been assessed against the test method set out in BS EN 778 1998 or BS EN 1319 1999 deleted as appropriate and certified as meeting the minimum requirements by insert name and or identification of Notified Body Installation a The system should be installed in accordance with BS 5864 2004 Installation and BS 5864 2004 b Ductwork that is newly installed or replaced should be insulated in accordance with the recommendations of BS 5422 2001 maintenance of gas fired ducted air heaters of rated input not exceeding 70 kW net second and third family gases Specification BS 5422 2001 Method for specifying thermal insulating materials for pipes tanks vessels ductwork and equipment operating within the temperature range of 40 C to 700 C 18 Table 5 Minimum provisions for system controls for gas fired vvarm air heating System Mi
101. n on solid fuel appliances see Energy Efficiency Best Practice in Housing Domestic Heating by Solid Fuel Boiler Systems CE47 47 Section 6 Community heating systems This section provides guidance on the specification of Community Heating CH systems in dwellings which if followed will satisfy the minimum requirements of Part L of the Building Regulations Although specific reference to CH is not made in ADL1A and ADL1B the paragraphs in each document dealing with central heating and hot water systems apply to CH Procedures for calculating the energy use and carbon emissions associated with CH are included in the Standard Assessment Procedure SAP 6 1 Scope of guidance The guidance in this section applies to CH systems It covers CH using boilers as the heat source as well as those that use low carbon heat sources such as Combined Heat and Power CHP biofuels heat pumps and solar panels Guidance is provided for two scenarios e where dwellings will be connected to a new CH scheme and e where dwellings will be connected to an existing CH scheme Requirements for the centralsheat source should be in accordance with the Non Domestic Heating Cooling and Ventilation Compliance Guide in support of Part L except where specified in this section Guidance given in the warm air heating or underfloor heating sections is also relevant to CH where these types of space heating systems are used with CH The remainder of this
102. ndary circulation is used all pipes kept hot i by that circulation should be insulated 12 7 35 For replacement systems whenever a boiler or hot 15 7 89 water storage vessel is replaced in an existing system gt gt 9 12 any pipes that are exposed as part of the vvork or are othervvise accessible should be insulated as 28 10 07 recommended above or to some lesser standard 35 11 08 where practical constraints dictate 42 HECK 54 14 12 In assessing the thickness of insulation required to meet the provision standardised conditions should be used in all compliance calculations based in this instance on a horizontal pipe at 60 C in still air at 15 C Further assistance in converting these heat loss limits to levels thickness of insulation for specific thermal conductivities is found in the TIMSA HVAC Guidance for Achieving Compliance with L of the Building Regulations 3 3 Oil fired range cookers with integral central heating boilers This section provides guidance on the specification of oil fired range cookers with integral central heating boilers for space heating and hot water in dwellings Note that the guidance applies only to twin burner cooker boilers which should not be confused with the type of range cooker described as a single burner dry heat range cooker The latter is intended only to provide a cooking function is not included in SAP 2005 calculations and does not come within the scope of
103. ne sy en uu 1s s p uoneuluuo ul A1e1u uu Iddns sBuljjamp Bunsix u suu s s 1u uu 23epld a l 10 UOISIAOId WNWIUIN sBuljjemp Bunsix pue u sui s s M U 40 UOISIAOId WNWIUIN p nunuo 6 lqeL 27 s UaWaIINbal y oH qul io pue pue Bulu Buluoz payloads y s eaww zey l s4S oluo2o 1 Aug S 5 1000 0 aAUEUISUE UE 1oN MMM MSQ M VIWO VI Siainjoejnuey sioqyuo JO uoEloossy u UO pue aINJesd I S AINJOeJNUeW u aq UE SW JS S O4U02 UO S ET D UOlSIAO E Se p e1sui q p nous e souu u s puli 201 6 OULH U E eloo 2uU172ele Jo Bu y Sepnjoaid yey d 6 4O Sliuollp e1sui JO Jepul Ad y JO 1 se yons s ouelsuuno4l9 fe ond x ul A PA UOZ oU 4Oyp ininsqns eq pino dund 2 e euidoldde ou 51 A PA uoz L 5 15 EUL U SE Yons SedUe SLUNDIIO Josi ospy 149 4 511 422W JOU s op SJ9 O1 UOD 49 EM 10 LT T UOU JO SN 0012 YORS o SAO il HO elulwesBod juueyo ynu abus e HO 5 uoz Bulyeay ajdiyjnw SUOHE
104. ng words The efficiency of this applianc has been measured as specified in insert appropriate entry from Table 7 and the result is x The gross calorific value of the fuel has been used for this efficiency calculation The test data from which it has been calculated has been certified by insert name and or identification of Notified Body The efficiency value may be used in the UK Government s Standard Assessment Procedure SAP for energy rating of dwellings 20 Table 7 Acceptable appliance types and minimum appliance efficiencies for independent fixed natural gas and LPG gas fired space heaters used asa secondary heat source British Standard designation appliance type Minimum efficiency gross calorific value Gas LPG BS EN 1266 2002 Independent gas fired convection heaters incorporating 72 73 a fan to assist transportation of combustion air and or flue gases All types except inset live fuel effect 63 64 BS 7977 1 2002 Specification for safety and rational use of energy of domestic gas appliances Radiant convectors BS EN 613 2001 Independent gas fired convection heaters 58 60 BS EN 13278 2003 Open fronted gas fired independent space heaters 45 46 Inset live fuel effect 40 41 BS 7977 1 2002 Specification for safety and rational use of energy of domestic gas appliances Radiant convectors Flue less Thermal efficiency requirements for prEN 148294 2003 Draft Independent gas fired
105. ngs with a total usable floor defined for new area greater than 150m should be systems provided with at least two space heating zones each having separate timing and temperature controls e Single storey open plan dwellings in which the living area is greater than 70 of the total floor area sub zoning of temperature control is not appropriate Time control Time control of space and water heating No minimum The level of of space and water heating should be provided by a full programmer with separate timing to each circuit OR two or more separate timers providing timing control to each circuit OR programmable room thermostat s to requirement but as far as it is practicable and economic to do so controls should be upgraded to the levels defined for new sophistication should generally be appropriate to and compatible with that of the appliance The highest levels are only appropriate to the heating circuit s vvith separate systems appliances vvith timing of the hot vvater circuit automatic ignition Temperature Separate temperature control of zones No minimum control of within the dwelling should be provided requirement but as far space heating using i Room thermostats or programmable room thermostats in all zones OR ii A room thermostat or programmable room thermostat in the main zone and as it is practicable and economic to do so controls should be upgraded to the levels
106. nimum provision VVarm air systems vvithout vvater heating i Time and Time and temperature control should be provided by either temperature i Controls external to heater time svvitch programmer and room control thermostat or programmable room thermostat OR ii Controls integrated in the heater time switch programmer and room temperature sensor linked to heater firing and fan speed control ii Zoning New dwellings with a total usable floor area up to 150m should be divided into at least two space heating zones with independent timing controls one of which is assigned to the living area New dwellings with a total usable floor area greater than 150m should be provided with at least two space heating zones each having separate timing and temperature controls Timing of the separate space heating zones can be achieved by i multiple heating zone programmers OR a single multi channel programmer OR iii Programmable room thermostats OR iv separate timers to each circuit OR v a combination of iii and iv above The provisions for zoning for replacement systems in existing dwellings should be as for new dwellings where practical Combined warm air and domestic hot water systems for installations iii Independent time control of both the heating and hot water circuits iv Pumped primary circulation to the hot water cylinder v Independent control of hot water production a
107. novs y UIY M S UOZ Jo 011400 ounyesodwiay s uoz Bulyeay oeds JO AjUO s JO4 UOD SLU 4 lloq UO FEUIQUUOD e se yons AjsnosuejUe sU ei 1972m JOY BU AOQE Al pue III Jo UODEUIOUUOOE A HO UDO UE o si uul Al HO 518180 WOO alOEUUUUSIDOId l HO Uewuwesboid uuguo ninuu lSuls e l HO 54 adoz Dungau ldiinu 104 pue Bune u AQ peaaiyoe oeds uloq 104 Iolluo2 Sulu luls e Agu ueo s uoz Buljeey oeds zesed s y zo Sulu Lu0S ULY 1942946 100 lqesn Ie1o1 e UA SHuljjomp 104 0 qe1d 228 SI 11 SLI 5111 Ul 1u s ud JOUSI N0119 4 EA JOY au JO Bulu YUM 5 Bulyeay ay o s ie1 souu u1 LUCE qeuuuueJ6o4d 11 2110 1972M JOY y 40 O4JUOD uul 91eJed s HO 31n lz UO o fonuo Sulu saaw ejed s JO OM I Bune u pue p opld 1 Buraq s egw JOY au juo ss lun suu s s mau 10 p ulJ p SV HO o Puiu nje AQ pinous Bulyeay 1942m pue 8S5eds JO 1400 uu 49 eM pue ooeds JO JO1 U0S OWL v lloq UOIJEUIQUIOD e YM SE uons AjsnosuejUe SU s 49 eM 104 aU J zou 51 UOZ
108. nsing boilers a To achieve high boiler efficiency return temperatures from radiator circuits should be selected lower than 50 C b Where instantaneous plate heat exchangers are used to produce hot water in individual dwellings the return temperature selected should be less than 40 C c Where hot water cylinders are used the coil size should be such as to require a flow rate that results in a nominal return temperature of less than 40 C while meeting the required heat up time d Where hot water is produced centrally e g in each_block of dwellings return temperatures lower than 40 C should be achieved 2 Controlling the sequencing and firing of boilers Controls for boilers should be in accordance with the requirements of the Part L Non Domestic Heating Cooling andVentilation Compliance Guide except for optimum start controls which are not required Setting occupation times is not generally possible for a group of dwellings and so optimum start controls are not a requirement 3 Minimising energy used by pumps For new CH systems the design temperature difference for the CH primary circuit should be greater than 20 C Variable volume control systems should be used to reduce the volume of water and the pressure difference required from the pumps under part load Pumping energy can be minimised by optimising operating temperatures and pipe sizes to reduce installed pump power To take full adva
109. ntage of variable volume systems variable speed pumps should be installed and controlled to deliver the required pressure difference to suit the load Further guidance is provided in BSRIA Application Guide AG 16 2002 Variable flow water systems design installation and commissioning guidance 49 Table 22 Minimum provisions for design of lovv carbon heat sources vvhere these are included in community heating systems Minimum provision Supplementary information 1 Lovv carbon heat sources No minimum requirement but see supplementary information CH systems can be designed to use lovv carbon heat sources to meet all or part of the heat demand which may enable some relaxation of the U values that would otherwise be required subject to the limits of design stated in ADL1A 2 Biofuels 3 Combined heat and power CHP No minimum requirement but see supplementary information Where CHP is used in conjunction with boiler plant the control system should ensure as far as practicable that the CHP plant operates as the lead heat source a Biofuels can be used to provide heat from boiler systems or as a fuel for CHP systems b Consideration should be given to operation and maintenance of the plant to ensure a long life and to prevent a later replacement by a conventional fuel system c Where a biofuel boiler is to be used in conjunction with conventional heating boilers or electric heating a reas
110. o Approved Solid Fuel Products and Services and on the website www HETAS co uk Individual manufacturers efficiency figures may be higher than those indicated and should be used where independently certified against the harmonised European Standards now in place Carbon emission factors Solid fuels include wood in various forms different types of coal and manufactured solid fuels and consequently there is a range of associated CO emission factors These factors are as important as appliance efficiency when selecting a boiler Table 17 shows the CO emission factors for generic types of solid fuel recognised in SAP Table 17 CO emission factors for generic types of solid fuel Solid fuel CO emission Notes kg CO kWh House coal 0 291 Traditional British coal burns with smoky flame Anthracite 0 317 A mineral fuel with high carbon content burns very cleanly Manufactured smokeless fuel 0 392 Mineral fuel usually made from anthracite Wood logs 0 025 Renewable wood logs either purchased or from own land Wood pellets in bags 0 025 Mechanically compressed sawdust Bulk wood pellets 0 025 As above delivered in bulk Multi fuel 0 187 A UK typical blend of logs and mineral fuel as burnt by a typical householder on a multi fuel stove Wood chips 0 025 Chipped wood processed on site Some appliances can only burn a single type of fuel while others may be able to burn a range of types The multi fuel
111. oilers The only positions that ARE to be considered are e a kitchen or e a kitchen dining room or e a utility room purpose made boiler room And only where they are on the ground floor or in a basement All other positions are NOT to be considered Table A3 Points for property type and fuel Building type Natural gas LPG Oil Flat 710 660 830 Mid terrace 640 580 790 Others end terrace semi detached or detached 590 520 760 71 L1 ASSESSING WHERE NON CONDENSING BOILERS COMPLY Notice to householder 1 Where Box W has been ticked a non condensing oil boiler may be installed before 01 Natural gas LPG 2 Where box X is ticked a like for like replacement boiler is reasonable 3 Where Box Y has been ticked or box Z has been ticked and cor 6 i exceeds 1000 this document may be used as evidence installation of a sing boi Others end terrace has been assessed as impractical or unec i u may choose to exceed semi detached or detached 590 520 760 the Building regulations requireme ion can be found Condensing boilers are more efficient and therefore save the energy efficiency helpline of your gas or ck of bill form t may be required when you sell your home 72
112. on for indirectly heated unvented closed storage water heaters BS 7671 Requirements for electrical installations BS 1566 Copper indirect cylinders for domestic purposes BS 4814 Specifications for expansion vessels using aminternal sealed hot water heating systems BS 7074 Application selection andiinstallation of expansion vessels and ancillary equipment for sealed watersystems BS 5422 Methods of specifying thermal insulation materials on pipes ductwork and equipment inthe temperature range of 40 C to 700 C BS 5449 Specification of forced circulation hot water central heating systems for domestic BS EN 12831 premises BS EN 12828 BS 6701 Telecommunications equipment and telecommunications cabling BS 5970 Code of practice for thermal insulation of pipes and equipment BS 6700 Specification and design installation testing and maintenance of services supplying water for domestic uses within buildings and their curtilages 67 Section 10 Individual domestic micro combined heat and povver This section provides some guidance on the specification of micro combined heat and povver CHP systems for dvvellings At the time of writing the guidance for micro CHP is still under development and is expected to include A Good Practice Guide specifying the minimum standards for installation and control of micro CHP Publicly Available Specification PAS 67 Laboratory test to determine he
113. onable minimum proportion of the annual heat supply from biofuels would be 45 of the annual heat demand space domestic hot water and process heating Further guidance is provided in Strategic Guide to Renewable and Decentralised Systems ODPM 2005 a CHP capacity should be optimised to meet the required economic and environmental objectives A reasonable minimum proportion of the annual heat supply from CHP would be 45 of the annual heat demand space domestic and hot water heating b To maximise the use of CHP heat over the year consideration should be given to the use of thermal storage to meet peaks especially in the early morning period c The procedure given in SAP 2005 should be used to calculate the carbon emissions from CHP systems 4 Heat pumps No minimum requirement but see supplementary information Heat pumps can be used as a heat source for CH systems Selection of operating temperatures to suit efficient community heating systems and achieve high CoPs is important if carbon emissions are to be reduced This may lead to the use of underfloor heating and the provision of domestic hot vvater by other means Where heat pumps are installed in conjunction with conventional heating boilers a reasonable minimum proportion of the annual heat supply from the heat pump would be 45 of the annual space heating demand 5 Solar No minimum requirement but see supplementary information Solar
114. one 020 7944 4400 Website www communities gov uk Crown Copyright 2008 Stock code 67342 ISBN 978 1 85946 279 9 First edition published May 2006 Second edition published December 2008 Copyright in the typographical arrangement rests with the Crown This publication excluding logos may be reproduced free of charge in any format or medium for research private study or for internal circulation within an organisation This is subject to it being reproduced accurately and not used in a misleading context The material must be acknowledged as Crown copyright and the title of the publication specified This document publication is value added If you wish to re use please apply for a Click Use Licence for value added material at www opsi gov uk click use system online pLogin asp or by writing to the Office of Public Sector Information Information Policy Team Kew Richmond Surrey TW9 4DU Email licensing opsi gov uk If you require this publication in an alternative format please email alternativeformats communities gsi gov uk Contents PAGE Section 1 ntroduction 4 1 1 Hovv to use this guide 5 1 2 Glossary 6 1 3 The Building Regulations requirements and the guidance in Approved Documents L1A and L1B 7 1 4 Replacement of primary heating appliances 8 1 5 Notification of building vvork 9 Section 2 Gas fired space heating and hot water systems 10 2 1 Scope of guidance 10 2 2 Gas fired vvet central heating systems 10 2
115. onstraints dictate Insulation for pipework in unheated areas Extra provision may need to be made to protect central heating and hot water pipework in unheated areas against freezing Further guidance is available in BS 5422 2001 Method for specifying thermal insulating materials for pipes tanks vessels ductwork and equipment operating within the temperature range of 40 C to 700 C BRE Report No 262 Thermal insulation avoiding risks 2002 Edition Where insulation is labelled as complying with the Domestic Heating Compliance Guide it must not exceed the following heat loss levels Pipe diameter OD Maximum permissible mm heat loss W m 8 7 06 10 7 23 12 7 35 15 7 89 22 9 12 28 10 07 35 11 08 42 12 19 54 14 12 In assessing the thickness of insulation required to meet the provision standardised conditions should be used in all compliance calculations based in this instance on a horizontal pipe at 60 C in still air at 15 C Further assistance in converting these heat loss limits to levels thickness of insulation for specific thermal conductivities is found in the TIMSA HVAC Guidance for Achieving Compliance with Part L of the Building Regulations 2 3 Gas fired range cookers vvith integral central heating boiler This section provides guidance on the specification of gas fired range cookers with integral central heating boilers for space heating and b
116. ot water in In order to comply with the requirements of Part L dwellings gas fired range cookers with an integral central heating boiler which are provided in new or existing dwellings should meet the following conditions a The appliance should have two independently controlled burners one for the cooking function and one for the boiler AND b The boiler should have a Seasonal Efficiency SEDBUK3 value in excess of 75 The manufacturer s declaration of appliance performance and SEDBUK value should include the following words 3 SEDBUK efficiency values can be found in the Government s Standard Assessment Procedure for Energy Rating of Dwellings 2005 edition www bre co uk sap2005 16 Seasonal Efficiency SEDBUK xx 96 Case heat emission value yy kW Heat transfer to water at full load zz kW The values are used in the UK Government s Standard Assessment Procedure SAP for the energy rating of dwellings The test data from which they have been calculated has been certified by insert name and or identification of Notified Body AND c The minimum provisions for gas fired central heating systems should be met with respect to the integral central heating boilers as given in Table 1 rows B E AND d The minimum provisions for boiler interlock Zoning and time control and temperature control of the heating and hot water circuits should be met with respect to the integral central heating boilers as
117. ow suu s s J ulo JO 99 5 yp s ulll 150 jou se OS 9q pinoys doo io15 o2 v UPIN JalsUgn SUL Q ysanbas uodn ajqeyjiene 9 621 N3 Sg o pue uone onunua pew Yoda 1s Wm v 40 saidoy funuod l euuu Ajayes sis UE Adwo 0 payeo Anu pu d pul q pinous 40 99 0D 4032 llO e H Good 45 ul S10 92 y o Bulp O29E ease 1012 lO v UIZIS u ym aq p nous vueuuo d JO sso y 104 aoueMoy e ue u y MS pue FS ueemjeq Buey 500 YOY jeuuou 11 pue wnwndo y o aoUeUeA JUeDIYIUBIS 10 Bulpeys Aneay JO JUeIIIUBIS JO S SB Ul JO jqepioneun SI Siy qissod JSA I Uu A SUOHeIO p peusun ul 5 aq plnous s o ylo UOISIAOIG WUNWUIUILU ON Bulpeus 40 SUEMO V UOISIAO d vun Bune u 10 SUOISIAOJG WNWIUIN LE lqEL 63 Burue pue Bulysny ul ysisse Aew S l S S JOY INSEWOP Ul 1942M JO JULIE 404 n bud JO BPOD 9002 669 98 JO SHed p piAoid SI U01 99 01d z 1J Jo SUBBLU
118. perates when flow temperature has dropped below a set level is recommended 53 Supplementary information Additional information is provided in the documents and standards listed below Good Practice Guide GPG234 Guide to community heating and CHP commercial public and domestic applications available from the Carbon Trust BS EN 13941 2003 Design and installation of pre insulated bonded pipe systems for direct heating BS EN 14419 2003 District heating pipes Pre insulated bonded pipe systems for directly buried hot water networks Surveillance systems BS EN 253 2003 District heating pipes Pre insulated bonded pipe systems for directly buried hot water networks Pipe assemblyof Steel service pipe polyurethane thermal insulation and outer casing of polyethylene BS EN 448 2003 District heating pipes Pre insulated bonded pipe systems for directly buried hot water networks Fitting assemblies of steel service pipes polyurethane thermal insulation and outer casing of polyethylene BS EN 488 2003 District heating pipes Pre insulated bonded pipe systems for directly buried hot water networks Steel valve assembly for steel service pipes polyurethane thermal insulation and outer casing of polyethylene BS EN 489 2003 District heating pipes Pre insulated bonded pipe systems for directly buried hot water networks Joint assembly for steel service pipes polyurethane thermal insulation and outer casing of polyethylene
119. ppropriate control of water temperature for the distribution system control of outdoor fan operation for air to water units e defrost control of external airside heat exchanger for air to water systems protection for water flow failure protection for high water temperature protection for high refrigerant pressure protection for air flow failure on air To water units External controls should include room thermostat to regulate the space temperature and interlocked with the heat pump unit operation e timer to optimise operation of the heat pump Table 30 Minimum provisions for warm air heat pumps ground to air water to air and air to air systems Minimum provision Supplementary information a Installation e Minimum clearances adjacent to all airflow paths as recommended by the manufacturer should be maintained e Pipe sizes should be in accordance with the manufacturer s recommendations e The refrigerant pipework on split systems sho ld be insulated in line with manufacturer s recommendations e H summer cooling is provided by the heat pump provision should be made for condensate drainage from the indoor terminal units e For ground to air and water to air systems all external pipework between the dwelling and the external heat exchanger should be insulated by following the guidance in the TIMSA guide e For ground to air and water to air systems constant water f
120. r solar pre heated vvater storage given in Table 31 row f Where work is carried out in a dwelling that already has a solar hot water system it is recommended that the insulation is upgraded in line with the minimum provisions for systems in new dwellings g The minimum provisions for storage volume of solar pre heated water given in Table 31 row g AND h The minimum provisions for system labelling and commissioning given in Table 32 rows h and i AND i The minimum provisions for insulating pipes in a solar primary system given in Table 33 62 s uun Je Je XUBULOH pue UO OUN 4991109 s uu 1s s y JO JOSN pu y WOJU IA I SS A yeay aid y WOW paysiyes Ape qie s ay J p ppE 51 1804 OU ey uons lq ssod aiayum souel dde y olluo2 15 5 sejos e Aq si souRl dde Bulyeay MHA elesedas e AUM A s inss ld pue sainyesodwia Mewud A SS X 10 S12 H S ADE y 1SuleBe andes Ayuesauul ileorneip4u Bulag l 1S4S 5 94 UTAVT S SUO 1041002 JO 54 E piAO4d Al SI Join enb pe u uA p sn jou si s inos yeay Ayel Ixne dny eq 4q 1972m 104 181 ansua il sedinos 1894 Hueillxne 10 SEU pjoo 10 99 09 1e os WO DunguDuo Joan uu91s s MHA Jejos au Aq p310 S JO SSO v SSILWIUIW H
121. rage cylinders calorifiers and the impact on energy use e the quality of service provided in terms of flow rate and temperature control e the advantages of having local storage in terms of security of supply Where the netvvork is extensive and hot water production is centralised a two stage water heating system can be used to deliver low return temperatures In this design the return water from the space heating circuit is used to pre heat the cold feed to the domestic hot water d2 Water treatment A suitable system for introduction of water treatment chemicals into the CH system in a controlled manner with facility for monitoring of water quality should be provided A suitable long term programme of water treatment is essential to preserve the life of the CH system by limiting internal corrosion Additional chemical and physical treatment should be evaluated especially for larger systems including removal of oxygen by physical means e softened water supply e side stream filtration e biocide e Heat meters Provision should be made in the design for including heat meters either at the time of installation or at a later date without major pipework changes f Commissioning e The CH system should be commissioned so thatthe design volume flow rates are supplied to each dvvelling and there is no excessive bypassing of vvater that vvould lead to higher pumping energy use e The flo
122. ray YAY Jo sjuewedinbas ay SJ9NOD YOIYM SUOSJAag 14 190 1 2 S 1U LULM AOB au 4 pun SY LFH Aq D H SID L 51 OYM lE1SUI Ue T 15 1 y INO p nous UOSI d JUaJBAWIOD V e uono ajyeudosdde uo 40 suonoru su S4 1N e nuew BY JO aq pinous suu 1s s MAU JO SV SUH S S MAU JO SY Joen s jaunyoejnuew y Sulpnioul sasn y o uogeiodo Su pue uu s s y uoneug dx lini E auf pinous 18 1 v U 1SAS BEB 01S BAN joy 10 pue i jioq sejnoed oun o 2utede WA 54012 11511 s ul suononulsui S JoIN OeJNUeW y UI ul PSUOISSILULUOD q Pinoys u vidinb v Sionuo pue sduind yiomadid se yons uldinb p eroosse ullA 41941960 uu 1s s B Jo1s 1 1eA 10 E JO llOQ E JO uopejjezsu ay JO R ldulo UO uononp i yu nb suo y pue jeos w Jo Jo omg y o si lioq UOIFEUIQUUOD JO JINDIIO 104 uy pue 5 JOJEM O JOJEM D y 7291 O BPeW q pinous UOISIAOIA uou Jaded 002 sp o5x ss upiueu JO EM E20 SUE OUT s j pouu JENPIAIPU JO spuaw inb s jeloads pue sjonpoud ueunpan Syeludoudde o suol onulsui UOmEIEISUL 5 J
123. scenarios in new and existing dwellings The guidance in this section applies to the following situations a The specification of central heating systems in new dwellings this situation is referred to in this section as a new system b The specification of central heating systems in existing dwellings where previously space heating was not provided by central heating this situation is also referred to in this section as a new system c The specification of a replacement central heating system and or component in existing dwellings where central heating is already installed this situation is referred to in this section as areplacement system In situations a and b above the guidance for compliance of new systems inmew and existing dwellings with Part L is the same In situation c above that is for replacement systems in existing dvvellings in most cases the guidance for compliance with Part L is as for new systems unless otherwise stated in the relevant section In order to comply with the requirements of Part L oil fired central heating systems which are provided as new systems or replacement systems in dwellings should meet the following conditions a The boiler should have a minimum efficiency as defined by its SEDBUK value as given in Table 9 row a AND b The minimum provisions for system circulation as given in Table 9 row b need to be met AND c The minimum provisions for hot water storage and l
124. should be maintained through the heat pump e Pipe sizes should be in accordance with the manufacturer s recommendations Installation e Installation should be carried out by an installer approved by the manufacturer e If during installation access to the refrigeration circuit is needed a competent refrigeration and air conditioning engineer with a valid refrigerant handling certificate and or an engineering services skillcard should carry out the work e Installation of the dwelling s water distribution system should be undertaken by a competent central heating specialist TIMSA HVAC Guidance for Achieving Compliance with Part L of the Building Regulations c Domestic hot water For full heating the heat pump should be capable of supplying water in the range 60 C to 65 C If the heat pump is not capable of supplying water at these temperatures supplementary heating should be provided and controlled as described in other sections of this guide The DHW system should include a tank thermostat and a time clock to optimise the time taken to heat the water The heat pump may be utilised for all or part of the DHW load During the DHW heating period the heat pump may not necessarily be providing heated water to the space heating system 59 Table 29 continued d Controls Heat pump unit controls should include control of water pump operation internal and external as a
125. sulated up to the point where they become concealed If secondary circulation issused all pipes kept hot by that circulation should be insulated For replacement systems whenever a boiler or hot water storage vessel is replaced in an existing system any pipes that are exposed as part of the work or are otherwise accessible should be insulated in accordance with the recommendations above or to some lesser standard where practical constraints dictate Insulation for pipework in unheated areas Extra provision may need to be made to protect central heating and hot water pipework in unheated areas against freezing Further guidance is available in e BS 5422 2001 Method for specifying thermal insulating materials for pipes tanks vessels ductwork and equipment operating within the temperature range of 40 C to 700 C e BRE Report No 262 Thermal insulation avoiding risks 2002 Edition Where insulation is labelled as complying with the Domestic Heating Compliance Guide it must not exceed the following heat loss levels Pipe diameter OD Maximum permissible mm heat loss W m 8 7 06 10 7 23 12 7 35 15 7 89 22 9 12 28 10 07 35 11 08 42 12 19 54 14 12 n assessing the thickness of insulation required to meet the provision standardised conditions should be used in all compliance calculations based in this instance on a horizontal pipe at 60 C in still air at 1
126. t 60 C in still air at 15 C Further assistance in converting these heat loss limits to levels thickness of insulation for specific thermal conductivities is found in the TIMSA HVAC Guidance for achieving compliance with Part L of the Building Regulations Insulation of community heating pipework i e distribution pipes outside the dwelling CH pipework should be insulated to the standards defined in EN 253 for pre insulated pipes or to an equivalent performance for conventionally insulated pipes Community heating pipework typically uses pre insulated buried pipe systems Minimum insulation thicknesses are defined in the EN standards Where pipework is run above ground the pipe insulation performance should be at least as high as that used in the buried part of the system Enhanced insulation standards should be evaluated where CH is supplied only from fossil fuelled boilers or where flow temperatures over 100 C are being used Designing for minimum heat losses from distribution pipework Heat losses can be reduced by optimising operating temperatures in conjunction with the need to minimise pumping energy Variable volume control systems will assist in maintaining low return temperatures While some bypasses may be needed to maintain the system in a hot condition ready to meet the demand these should be controlled to the minimum flow needed The use of temperature controlled bypass valves where the bypass only o
127. ted in the Supplementary nformation column and labelled Insulation for pipework in unheated areas Extra provision may need to be made to protect central heating and hot water pipework in unheated accordingly as follows areas against freezing Further guidance is available in BS 5422 2001 Method for specifying thermal insulating materials for pipesytanks vessels ductwork and equipment operating within the temperature range of 40 C to 700 C BRE Report No 262 Thermal insulation avoiding risks 2002 Edition e Primary circulation pipes for heating and hot water circuits should be insulated wherever they pass outside the heated living space or through voids which communicate with and are ventilated from unheated spaces e Primary circulation pipes for domestic hot water circuits should be insulated throughout their length subiect only to practical constraints imposed by the need to penetrate joists and other structural Where insulation is labelled as complying with the Domestic Heating Compliance Guide it must not exceed the following heat loss levels elements Pipe diameter OD Maximum permissible All pipes connected to hot water storage vessels mm heat loss including the vent pipe should be insulated for at W m least 1 metre from their points of connection to the cylinder orthey should be insulated up to the point 8 7 06 where they become concealed 10 7 23 e f seco
128. ted up to the point where they become concealed e f secondary circulation is used all pipes kept hot by that circulation should be insulated For replacement systems whenever a boiler or hot water storage vessel is replaced in an existing system any pipes that are exposed as part of the work or are otherwise accessible should be insulated in accordance with the recommendations above or to some lesser standard where practical constraints dictate Supplementary information Insulation for pipework in unheated areas Extra provision may need to be made to protect central heating and hot water pipework in unheated areas against freezing Further guidance is available in e BS 5422 2001 Method for specifying thermal insulating materials for pipes tanks Vessels ductwork and equipment operating within the temperature range of 40 C to 700 C BRE ReportNo 262 Thermal insulation avoiding risks 2002 Edition Where insulation is labelled as complying with the Domestic Fleating Compliance Guide it must not exceed the following heat loss levels Pipe diameter OD Maximum permissible mm heat loss W m 8 7 06 10 7 28 12 7 35 15 7 89 22 9 12 28 10 07 35 11 08 42 12 19 54 14 12 In assessing the thickness of insulation required to meet the provision standardised conditions should be used in all compliance calculations based in this instance on a horizontal pipe a
129. thermal panels can be used as the heat source for a centralised domestic hot water system 50 Table 23 Minimum provisions for system controls vvithin dvvellings for community heating Minimum provision for new systems Supplementary information 1 Zoning e Dwellings with a total usable floor area up to 150m should be divided into at least two zones with independent temperature control one of which is assigned to the living area e Dwellings with a total usable floor area greater than 150m2 should be provided with at least two space heating zones each having separate timing and temperature controls In single storey open plan dwellings in which the living area is greater than 70 of the total floor area sub zoning of temperature control is not appropriate 2 Time control of space heating Time control of space heating should be provided by i a full programmer OR two or more separate timers providing timing control to each zone OR Programmable room thermostat s to the heating circuit s e For dwellings with a total usable floor area greater than 150m timing of the separate space heating zones can be achieved by i multiple heating zone programmers OR ii a single multi channel programmer Where the hot water is produced instantaneously such as with a plate heat exchanger time control is only required for space heating zones Time control of domestic hot water heating
130. thermostats or other suitable temperature sensing devices of controlling the temperatures independently in areas that have different heating needs e g separate sleeping and living areas In existing dwellings wherever practical temperature controls should be upgraded to the standards required for new dwellings Table 6 Acceptable appliance types for fixed natural gas and LPG gas fired space heaters for use as a primary heat source British Standard designation appliance type BS EN 1266 2002 Independent gas fired convection heaters incorporating a Ton fo assist transportation of combustion air and or flue gases BS 7977 1 2002 Specification for safety and rational use of energy of domestic gas appliances Radiant convectors BS EN 613 2001 Independent gas fired convection heaters BS EN 13278 2003 Open fronted gas fired independent space heaters Gas fired fixed independent appliances for secondary space heating In order to comply with the requirements of Part L gas fired fixed independent space heating appliances which are provided as the secondary heat source in new or existing dwellings should meet the following conditions a The appliance should be one of the types described in Table 7 AND b The efficiency gross calorific value of the appliance should be no less than the value in Table 7 for that type of appliance The appliance manufacturer s declaration of appliance performance shall include the followi
131. tion Section 2 E AN Ae systems Section 1 1 Gas Systems 7 How to use the guide Pages 10 22 Section 7 Section 1 2 Underfloor heating systems Glossary Section 3 Pages 55 57 Section 1 3 Oil systems Requirements and Pages 23 31 Section 8 guidance in Approved Heat pump systems Documents Pages 58 61 and L1B R 7 ectri Section 1 4 Pages 32 37 Section 9 Replacement of Solar hot water systems primary heating Pages 62 67 appliances Section 5 Section 1 5 Solid fuel systems Section 10 Notification of Pages 38 47 Micro CHP systems building work Page 68 Section 1 2 Glossary Approved Document L1A ADL1A Approved Document L1B ADL1B The Building Regulations Department for Communities CLG and Local Government Domestic Heating Compliance Guide Minimum provision Supplementary information SAP 2005 Approved Document L1A gives guidance on how to satisfy the Building Regulations energy efficiency requirements when building new dwellings Effective from 6 April 2006 Approved Document L1B gives guidance on how to satisfy the Building Regulations energy efficiency requirements when carrying out work in existing dwellings Effective from 6 April 2006 Statutory Instrument 512000 531 The Building Regulations ensure the health safety welfare and convenience of people in and around buildings and reasonable provision for the conservation of fuel and power and access to and use of buildings by providing
132. to these is any boiler management system that delivers the specified zoning timing and temperature provisions VVhen oil boilers are installed as a replacement for existing boilers the minimum level of system controls should be provided as described in Table 10 unless they are already installed and fully operational If an individual component of the control system is being replaced in an existing system for example a room thermostat it is not necessary to upgrade the system to meet the minimum requirements AND e Pipework should be insulated as described in Table 11 3 4 Continually burning oil fired vaporising appliances providing secondary heating or hot water This section provides guidance on the specification of oil fired vaporising appliances providing heating or hot water for dwellings that if follovved will satisfythe Building Regulations energy efficiency requirements The guidance does not apply to appliances that have been converted from another fuel for example from solid fuel to oil n order to comply with the Building Regulations energy efficiency requirements oil fired vaporising appliances in new and existing dwellings should be provided with the minimum controls given in Table 11a Table 11a Minimum provision of controls for continually burning oil fired vaporising appliances Appliance type Minimum provision Supplementary information Manually operated appliance e g The integral manual controls as Infor
133. ts of Part L ofjthe Building Regulations Terminology and applicability of guidance to different scenarios in new and existing dwellings The guidance in this section applies to the following situations a Thesspecification of central heating systems in new dwellings this situation is referred to in this section as anew system b The specification of central heating systems in existing dwellings where previously space heating was not provided by central heating this situation is also referred to in this section as a new system c The specification of a replacement central heating system and or component in existing dwellings where central heating is already installed this situation is referred to in this section as areplacement system In situations a and b above the guidance for compliance of new systems in new and existing dwellings with Part L is the same In situation c above that is for replacement systems in existing dwellings in most cases the guidance for compliance with Part L is as for new systems unless otherwise stated in the relevant section In order to comply with the requirements of Part L gas fired central heating systems which are provided as new systems or replacement systems in dwellings should meet the following conditions a The boiler should have a minimum efficiency as defined by its SEDBUK value as given in Table 1 row a AND b The minimum provisions for system circulation as give
134. u ls s Bullsix poveda Ajjnj evey pinous sin n aJe S llOQ U YM SLU9 SAS MOU JO SV Ayewlid Jayem 104 hs ulOp pue Hulyeay aoeds 104 54 5 6 wia shs q Sa lloq Bune u jeu e1B lui ULM S124009 1 UM q d OO By 5401851112 uwNjoa 00Z dVS apinB 5101 Jo g g uoll98S u p ulj p Se q pinous si yoo Suci JO Z lQEL Woy UE q pinous 5 1851 UUM D uIQuuo2 yey si ioq Hulyeay 104 A U L H d lloq l zZ esodind pesn OD 8ul Oe siy DUIELU l l q 1 ss lloq 194009 e6uel 104 p MAU BU Ul Desen yey o p eld z S l q soles z 0602 UO suond x 22120 eut 5 z y ul p sn l n y JO 40398 uolssiuu9 Soe eut lo sz Hoq uoneuiquuoo 104 10 2 1lu uuss ssv 15 one au q p lldin nu pinous 21 y lqEL X xog Ul p ip lpul SE aal OU 15 1 Sulsu puo2 y o pine ay l 1no 195 sp JSix i JO A U T LH au Ian y l Hip e s sn souel dde fEUI LO y Wold sip AIJ ag Up poned DuAUISnb y s oup suuno4l9 jeuond ox aiaym Bulysijqejse e u 10 Ul 1S S Bulyeay m u y y s ou i dde 1 104 yey 1oN 1u uunoop siuyjo v xipu
135. u u1 E JO JaINjOeJnuewW y Aq Ayeoyioeds aiaym 1090 S SS A uoisuedx 8 5 5 Sune u p je s o Da ou p nous s upildde janypljos 23 q pinous siole p 1 1604 jo Suluonisod pue Bulzis v uo suononuisul 5 q U SOU ag p jnous peduund Ajjny ajqeyrene SI 00 Sau SUMH S S M U 40 UOISIAOI un uu 1s S e Bune u IE nu ni pilos yo Suluolss ululo pue Wa sAs 15 19 eM 104 15 Ion l S4S 10 SUOISIAOIG WNWIUIN SL lqEL 42 49y Ji y u o Ue SI uojjezu wn op ajzeudoidde noy m esredonudo yows P IEO JO poom Jo Asa eypesneoaq lonuo uaymu ye q p nous aed s vsuedde IOJ JJ plou snou y uu s s BEJo S 40JEM JOY JO pup Iaoa sejnoipied u o yp ds suon nu sul Buneiado 3y 4 AO D DUPU pue AB det 12y pue 1U UL1S UlE UO aset suon nu sul sg lm cinupul BY pue Bulpiing u u SUBDA02 E ul BuluoiIssiuuuuo2 pue paeo aney Aa 15U1 JOY UIYLIM Appa Uu uossad p YONS g Tgdv pue Flick pue
136. w rates in individual heat emitters should be balanced using appropriate return temperatures or by using calibrated control valves e The systems within the dwellings should be demonstrated to the resident and suitable information provided on the operation of the controls Where the central heat source includes a low carbon heat source the control system should be proven by demonstrating that the low carbon heat source will normally act as the lead heat source 52 Table 25 Minimum provisions for insulation of pipes for community heating systems vvithin dvvellings and distribution pipevvork outside the dvvelling Minimum provision n new systems pipes should be insulated to comply with the maximum permissible heat loss indicated in the Supplementary Information column and labelled accordingly as follows e Primary circulation pipes for heating and hot water circuits should be insulated wherever they pass outside the heated living space or through voids which communicate with and are ventilated from unheated spaces e Primary circulation pipes for domestic hot water circuits should be insulated throughout their length subject only to practical constraints imposed by the need to penetrate joists and_other structural elements All pipes connected to hot water storage vessels including the vent pipe should be insulated for at least 1 metre from their points of connection to the cylinder or they should be insula
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138. y driven heat pumps should have coefficient of performance of no less than 2 0 when operating at the heating system design condition AND b The minimum provisions for supply temperatures and for wet systems radiator efficiency in systems using warm and hot water heat pumps as the heat generator should be met as given in Table 29 row a AND 58 c The minimum provisions for installation should be met as given in Table 29 rovv b for vvarm and hot vvater heat pumps and as given in Table 30 rovv a for vvarm air heat pumps AND d VVhere vvarm and hot vvater heat pumps are used to meet all or part of the domestic hot water load the minimum provisions for hot water should be met as given in Table 29 row c AND e The minimum provisions for control of the system should be met as given in Table 29 rovv d for warm and hot water heat pumps and as given in Table 30 row b for warm air heat pumps Table 29 Minimum provisions for vvarm and hot vvater heat pumps ground to vvater vvater to vvater and air to vvater systems Minimum provision Supplementary information a Supply water temperatures and or efficiency Underfloor heating Supply water temperatures to the underfloor heating system should be in the range 30 C to 40 C Radiators High efficiency radiators with high water volume should be utilised Supply water temperature to the radiators should be in the range 40 C to 55 C See section 7 of

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