efficient home heating - the Sustainable Energy Authority of Ireland
Contents
1. Planning the use of passive solar heating can reduce heating energy use from between 25 to 75 compared to a typical structure In Ireland glazing should be concentrated on the south fa ade to make best use of solar energy windows on the north fa ade should be minimised to limit heat loss Passive solar energy can also take advantage of the thermal mass of building materials such as masonry walls or concrete floors These can absorb and store energy during the day and release it gradually during the evening However south facing glazed areas should not be increased too dramatically Otherwise additional measures will be required to avoid overheating in summer and excessive heat loss at night and on overcast days in winter Active solar energy Active solar energy systems use solar collectors positioned on south facing roofs to harvest heat from the sun and distribute it using an air or water network Solar systems can provide on average 60 of a family s annual hot water requirement Solar heating is best contemplated when building a new house However while retrofitting of an existing house can be difficult and expensive convenient solar heating packages are now available which can produce a sizeable volume of a typical house s annual hot water demand However whether new or retrofit a cost analysis of solar heating systems should be completed prior to installation in order to determine the possible payback period o2. Answer section in the SEAI website www seai ie yourhome Maintenance An annual boiler safety check and boiler service carried out by a professional service engineer ensures that your boiler is functioning properly If your oil or gas boiler hasn t been serviced recently then you could be wasting money In fact by servicing your boiler you could improve your overall efficiency by 10 The benefits of servicing your boiler gt Saves you money reducing your heating costs gt Reduces CO emissions benefiting the environment gt Gives you peace of mind improving your boiler s reliability and safety For more information on servicing an oil or gas boiler visit www seai ie boilers All heating systems including those fuelled by renewable energy will perform more efficiently and therefore more economically if they are well maintained and serviced on a regular basis Your system will come with a user s manual and a service schedule These are set out by the manufacturer and we would recommend that you follow these to ensure that your heating system works at its optimum level all the time 20 lt es ae a SE nn Home heating is the major contributor to domestic energy use so adopting the recommendations in this SEAI booklet will reduce the amount of energy used to heat your home and produce a better BER for your property It is imperative that all of us put these actions in place now Not only will this help the env
3. availability storage and cost all have to be taken into account But just as important are the environmental impacts your choice of fuel will have Most of the energy we use in Ireland comes from fossil fuels oil coal peat and gas These are not renewable once they are gone they cannot be replenished Burning fossil fuels releases carbon dioxide CO into the atmosphere This is a major contributor to climate change The sustainable alternative to fossil fuels is renewable energy and this will never be exhausted Renewable energy is available to us in many forms The main ones are gt Solar energy the sun for space and water heating gt Geothermal heat from below the surface of the earth heat pumps for space and water heating gt Biomass woodchip and pellets boilers and stoves for space and water heating Wind powered turbines the wind for electricity generation gt Hydro electric power moving water in streams for electricity generation v Heat meet your annual heat demand The total amount of heat required for a dwelling is called its Annual Heat Demand This is a factor of gt heat lost from inside to outside through the roof windows doors and walls gt heat required to offset the loss of warm air escaping through windows doors chimneys and other openings and heat to warm up the cold fresh air that replaces the lost air and provides ventilation gt heat required to provide adequate ho
4. heating circuits Two aspects of a hot water cylinder that should be controlled are i the times that heating water is circulated from the boiler to the coil heat exchanger and ii the temperature at which the hot water in the cylinder is stored Point of use control It is recommended that domestic hot water should be stored at 60 C However water at this temperature is too hot for showers The process of mixing hot water from the storage cylinder with cold water from the cold water cistern can be automated by installing a Thermostatic Mixing Valve Once set at the desired temperature the shower water temperature always remains the same provided the water in the storage cylinder is at or above the desired temperature This minimises energy and water wastage Instantaneous DHW at isolated users In large houses distributing heat energy and water from a central storage cylinder causes wastage Installing a local hot water system at points of usage eliminates this waste Local systems may be either i storage or ii instantaneous They use natural gas liquid petroleum gas or electricity 19 Problem solving Heat generation and distribution systems are prone to a number of issues which can affect their performance It is therefore recommended that your heating system is serviced regularly For a list of the issues problems and answers that may affect your heat generation and distribution systems please refer to the Question and
5. at emitters gt Underfloor heating gt Localised heat emitters All types offer advantages and disadvantages which are examined in turn Radiators centrally generated Radiators are flat sealed metal containers through which hot water flows from the heat generator e g boiler or heat pump They normally operate at temperatures of between 60 and 65 C depending on the boiler thermostat setting However low temperature radiators are available for use in conjunction with heatpump or condensing boiler systems Advantages of radiators gt Fast response heating up time gt Can be situated near cold surfaces e g single glazed windows thus reducing down draughts gt Individual room control possible using TRVs gt Relatively low installation costs gt Retrofit possible in older homes Disadvantages of radiators gt Subject to leaks and require maintenance gt Some systems condensing boiler geothermal heat pump require larger radiators to operate efficiently gt Can create uneven heating particularly in larger rooms gt Unsightly and interfere with positioning of furniture Underfloor heating This is a means of distributing heat throughout a home via a network of hot water pipes built into the floor through which flows heated water Advantages of underfloor heating No radiators so easier decoration and improved room appearance Lower temperature radiant heat provides a stable comfortable environm
6. cient gt Open Fires visually attractive but highly inefficient form of heating only 15 20 in terms of heat output gt Enclosed gas fires Aesthetically pleasing and highly efficient with no draught effect Advantages of localised heat emitters gt Provide instant and convenient heat gt No distribution network required gt Can be very efficient depending on type used gt Can provide a quick reliable and cost effective heating solution Disadvantages of localised heat emitters Some use non sustainable fuels Greenhouse gas emissions much higher compared to alternative energy sources No storage capacity May pose a Safety risk Controls limited Usually have little or no water heating facility v Pyy 15 16 Control systems take charge of your heating Under current Irish legislation it is a necessary requirement to manage the output of space and water heating via control systems Whether it is for a new build or the upgrade of an existing system as many as possible of the relevant energy saving control measures shown in this guide should be included By implementing these measures you will not only reduce your heating bill but also reduce the carbon footprint of your home It is worthwhile noting that the Home Energy Saving HES scheme administered by SEAI provides grants to homeowners seeking to improve the energy efficiency of their home in order to reduce i energy use ii costs and iii
7. d and sealed efficiently Ensure the building is insulated to as high a specification as possible The minimum requirement set out in Part L of the Building Regulations is air permeability of 10m m h Best Practice is considered to be 5m m7 h Air tightness should also be discussed with your building contractor to ensure that good construction practices are used during the build You can also refer to Good Practice Guides 224 and 268 on ventilation visit www seai ie Size and select the most efficient heat generation system possible Part L of the Building Regulations requires all new dwellings to have 10kWh per m per year thermal or 4kWh m yr electrical energy supplied by renewable technologies So choose a heating system that will meet this requirement using sound engineering and best practice principles Take energy efficient designs into consideration in sizing the most efficient heat generation system for the dwelling Also balance long term running costs against short term savings Select the most efficient and practical heat emission system Make sure the heat emission system radiators etc is as efficient as possible taking into consideration the type and location of units specified Ensure efficient control of both space heating and Domestic Hot Water DHW Make sure that once the most efficient heating system has been chosen good control systems are also employed _ Ny Practical advice for heating systems in existing ho
8. diators When heating is not required in a particular part of your home you can isolate heat emitters in this area either manually or automatically Manual control Most radiators and convectors are fitted with a hand wheel valve This is essentially an on off switch which allows the heat emitter to be isolated from the heating circuit Thermostatic Radiator Valves TRVs A thermostatic radiator valve TRV may be installed instead of the hand wheel valve The TRV has a number of settings which adjust the flow of heating water to the heat emitter according to the temperature of the room So for example in rooms where a high level of heating is required the TRV will be set at the top setting Conversely if only background heating is desired then the valve will be at its lowest setting A motorised valve may be used along with the hand wheel valve It is activated by a thermostat located in the room However while motorised valves may offer more effective heat control than a conventional TRV they are also more expensive Control of the hot water system As has been previously outlined domestic hot water supply may be provided from a central storage cylinder from local storage or from an instantaneous source There is scope for energy saving in the way hot water is produced and used Control of central storage cylinder The hot water cylinder should be supplied with heating water from the boiler via a separate circuit from the space
9. e Seal 2 Orr ENERGY AUTHORITY OF IRELAND of one efficient home heating your options of If each of us becomes aware of our own power when it comes to energy efficiency and use it properly we can collectively make a big difference to ourselves to our pockets and to the environment By taking individual responsibility and changing our behaviour in small ways every day we ll help save energy while we save money too All we have to do is recognise our power and use it That s what the Power of One is all about For more information check out chanee ie The change campaign is a vital part of Ireland s plan of action on climate change The campaign s overriding goal is to engage the nation on the issue and to drive the significant behavioural changes that will be required to lower greenhouse gas emissions At the core of the campaign is the change ie website and carbon calculator which helps people identify real savings you can make because when you cut carbon you cut costs For more information visit www change ie SF a SUSTAINABLE ENERGY AUTHORITY OF IRELAND efficient home heating your options About the Sustainable Energy Authority of Ireland 2 24 0004 0e 0 eee eecmnctnns teense 3 HOW Cols Booklet CaMinGlD VOU e cre a a erne meme ete a cee em eseas 4 Your home and your heating requirements esessssssssssseeereersesssssssssesceceeerssssssssssseeeereeoe 4 Practical ideas for h
10. eating systems in new homes ssssssssssssssessssssssssesssssessesesseeeeeees 6 Practical ideas for heating systems in existing NOMES sssssssssseseerererereererererererserereeeeeeseee 7 Renewable heat generation options the sustainable alternative ccccsccccecseeeseseeees 8 Choosing your conventional space heating system ccccccccccssssssssssseeeeceecccceceseneneeesseees 1i Choosing your Water heating systern a a aa e a E E E ea 12 Heal distribution systems the Options cen cen cereccce et nents ceecateey aeos eA eee ree cea ees 13 Heat emitters Une OMLIOMS arcs cet nese ee ee ee eee ee eae 14 Control systems take charge Of your heating cceecceccccceccecececeeeceececececeeaeaeeeacaenenenenenes 16 PEODI CMS OIMIM Cie a a enc ote renter T A E A ina tenets ene et ont ene er E A oan aK 20 The BER scheme aa a earner eee eer ee ere een eee ree rrr er ren ee 21 The Sustainable Energy Authority of Ireland SEAI established by Government under the Sustainable Energy Act 2002 has a mission to play a leading role in transforming lreland into a society based on sustainable energy structures technologies and practices Its key objectives are implementing strong energy efficiency actions accelerating the development and adoption of technologies to exploit renewable energy sources supporting innovation and enterprise for our low carbon future and supporting evidence based responses that engage al
11. ent Provides a background level of heating Ideal for use with heat pumps or condensing boilers More uniform heat distribution throughout the room Intelligent self learning controls can improve response times VVUVV VY Disadvantages of underfloor heating Up to 20 25 more expensive to install Slow response time is less suited to the Irish climate Controls and design must be of high standard to ensure satisfactory operation Limited flexibility considerable building work is required to change the system Room furniture may impede the emission of heat from floors Low temperature surface of floor may be inadequate to heat poorly insulated Spaces Generally only appropriate for new homes new buildings Need higher levels of insulation in the floor than for conventional building Building regulations require a U value better than 0 15 W m K VVUVVV Vv Localised heat emitters room heaters These are heat emitters which generate and emit heat into the space they occupy independent of a central heating system The main types are gt Wood pellet solid wood stoves A wood burning stove can easily power many radiators as well as providing hot water gt Gas or oil fired room heaters operate at 100 efficiency by burning LPG or kerosene but release CO and water vapour so require adequate ventilation gt Electric heaters radiant blow heaters convectors oil filled radiators and storage heaters Costly but nearly 100 effi
12. ent regulations suggest that for homes over 100m the heating system should be split into at least two zones namely the bedrooms cooler and living areas warmer Load compensator This device regulates the water temperature in the DHW circuit in direct relation to the temperature measured inside the dwelling Weather compensator Designed for larger installations a weather compensator control helps reduce energy use and associated utility costs by linking the temperature inside a dwelling to that outside This means for example that when outside temperatures rise the demand for space heating in the house is reduced thus saving on heating costs Weather compensation is particularly beneficial in conjunction with condensing boiler systems as it can help the boiler run more efficiently for longer Boiler energy manager This device improves boiler control by using a selection of features previously detailed such as load and weather compensation boiler interlock zone control etc It is an extremely efficient way to operate the heating system in your home Flow switch A flow switch detects when there is no water flow through the Domestic Hot Water DHW system for example when all TRVs are in the fully closed position and there is no heating requirement Control of heat emitters Water is the most common distribution medium in heating systems and heat is generally emitted to rooms via radiators or convectors fan assisted ra
13. es and public buildings The aim of this leaflet is to give householders an informative guide to the various home heating systems available and their relative merits Perhaps you want to improve the efficiency of your existing heating system Or maybe you wish to learn about the most up to date home heating technologies If so this booklet will give you clear concise guidance on how to create warmth and comfort in your home in ways that will help the environment and your pocket Wrap up well Before examining your heating system it is important to review how well your house is Aa insulated For example fitting draught excluders around windows and doors where no draught protection is in place can cut heat loss by as much as 20 in winter Investing in high grade insulation does more than cut down on heat loss It also means that once your home is heated to the required temperature it is easier for your heating system to maintain this temperature so it uses less energy Insulating your home can give long term benefits through reduced running costs Capital investment in your heating system will also be reduced as a smaller more efficient heating unit will be required For further information on how to effectively seal your home consult SEAI s Guide to Insulating Your Home Fuel choose the sustainable option Y3 a There are a number of factors to consider when selecting the type of fuel for your home D For example
14. greenhouse gas emissions This national scheme is open to all owners of houses built before 2006 The types of measures currently eligible under HES include the installation of high efficiency gt 90 gas or oil fired boilers and heating control upgrades as well as roof and wall insulation For further information visit www seai ie hes This section will examine the four key areas where control measures can be implemented to improve the efficacy of your home heating system gt Control of the heat generator gt Control of the heat distribution system gt Control of the heat emitters gt Control of the hot water system Control of the heat generator Where economically viable as many as possible of the following control options should be included for the efficient and safe operation of a fuel burning heat generator Time switch A time switch enables the boiler to provide heat to either the space heating and or the domestic hot water supply circuits when required This means for example that domestic hot water can be provided in the summer when heating is not required The provision of separate space heating and domestic hot water supply circuits is a requirement for new buildings Delayed start thermostat This control device uses a time switch to monitor internal and external temperatures and delays the boiler start In this way it reduces the number of hours per day that the heating system runs without creating any disco
15. ironment through lower CO emissions it will also benefit homeowners through greater home comfort levels and reduced home heating costs Read our other publications visit www seai ie yourhome 21 e Se SUSTAINABLE woe ENERGY AUTHORITY a OF IRELAND of one
16. ity of home heating appliances used in Ireland This very helpful tool will help you identify the most efficient appliances available including renewable appliances for heating your home It can be found online at www seai ie harp Renewable heat generation options the sustainable alternative We are rapidly depleting our supplies of non renewable energy oil gas coal and peat We also need to reduce our emissions of greenhouse gases This means it makes sense to adopt sustainable energy solutions wherever possible Indeed current building legislation means we must address these issues Part L of the Building Regulations States that all new dwellings receiving planning permission after 1st July 2008 must use renewable technologies The good news is that there now are a range of efficient renewable energy technologies we can use to heat our homes These energy systems include gt Solar energy gt Biomass systems gt Heat pump systems We shall examine each of these technologies in more detail Solar energy Even in Ireland s temperate climate solar energy can still contribute significantly to our domestic heating requirements Current technology allows heat to be gained ina passive or active way Passive solar energy Passive solar energy involves capturing heat from the sun via windows and other glazed surfaces Modest levels of passive solar heating can reduce building auxiliary heating requirements from 5 to 25
17. l actors SEAI s activities can be divided into two main areas SEAI is here to help every energy user in Ireland homeowners and businesses farmers and food outlets schools and hospitals We do this by raising awareness and providing information advice and publicity on best practice stimulating research and development advising on energy policy and publishing energy statistics You ll find up to date information about our activities as well as advice and tips on our website at www seai ie Contact us engage with us ask for advice put forward your ideas We re here to listen and to help By working together we ll create a greener cleaner sustainable future for Ireland How this booklet can help you This booklet is designed to give you clear impartial advice about how best to maximize the efficiency of your home heating system whether a new build or a retrofit It will show you how to do this in ways that are cost effective sustainable and environmentally friendly It examines the practical ideas and the various heating technologies you should consider for your home and offers clear concise advice Your home and your heating requirements Home is where the hearth is We live in a world of ever growing energy awareness Increasing home heating costs driven by fluctuating fuel prices mean we must try to use energy as efficiently and sustainably as possible without compromising the comfort of our homes workplac
18. ly they offer only 15 to 20 efficiency meaning that up to 80 of the heat literally goes up the chimney Open fires require air for combustion and cause an increased ventilation rate in rooms Draughts can be avoided if the air supply is located close to the fire e g ducted in directly from outside A damper that closes the chimney when not in use will help to avoid unnecessary heat loss Fully sealed gas fuelled fires with back boilers offer an alternative to open fires most models comply with current building regulations 11 12 Systems for meeting Domestic Hot Water demand DHW fall into three main types Centrally stored systems gt Boiler systems The central boiler heats water in a hot water storage vessel such as a cylinder or thermal store The hot water is then distributed to the taps on demand as required There will be heat losses from the cylinder storage vessel from the hot water stored there and it is recommend to lag or insulate this as much as possible to minimise this loss There is also some heat loss through the primary pipework from the boiler to the hot water storage vessel gt Room heater systems Heat exchanger in the room heating unit such as a back boiler in an open fire heats water for domestic use This system incurs both storage and distribution losses These should both be minimised to enhance system performance gt Immersion heater systems These systems use the electric heating ele
19. mands The water circuit may be open or closed to the atmosphere gt Open systems Open systems e g solid fuel systems use a small feed and expansion tank located in the attic to fill the system and to allow for the expansion of water during the heating process A vent pipe from the heat generator provides a safety outlet in the event of water boiling gt Closed systems These systems are closed to the atmosphere pressurised systems which means they can operate at slightly higher temperatures than open systems Closed systems must incorporate a small expansion tank and air safety release valve The system is filled by an automatic valve instead of a feed tank Air distribution gt Warm air generators Use ducting to distribute heat throughout a dwelling Ducting is usually made of metal and is hidden in the ceiling void Warm air systems are particularly suitable for thermally lightweight buildings i e buildings in which the walls floors and ceilings of the rooms are constructed of plasterboard or timber gt Warm air recovery systems These systems incorporate a ventilation system and an air to air heat exchanger in the attic space They are designed to work in conjunction with passive solar design and heat recovery ventilation in newer more sustainably designed homes 13 14 Heat emitters the options Heat gets into your room via a heat emitter They fall into three distinct types gt Centrally generated he
20. ments installed in hot water storage cylinders These typically have two electric elements i a low rated element to supply small quantities of hot water for sinks or showers and ii a higher rating element to heat sufficient water for larger demands such as baths Locally stored systems gt Larger storage type A range of gas fired or electric wall or floor mounted domestic water storage heaters are available for baths and multi outlet applications gt Over sink type Gas fired or electric hot water storage heaters of this type are available for single outlet sinks or basins gt Under sink type Electric under sink hot water storage heaters are available for single outlet applications and work in much the same way as over sink types Instantaneous systems gt Gas fired instantaneous water heater A suitable natural or liquid petroleum gas supply and a minimum water supply pressure of 1 bar or 10 metre head is required to operate this type of water heater gt Electric instantaneous water heater An electricity supply of 30 amps and a minimum water supply pressure are required to operate this type of water heater Heat distribution systems the options Once generated heat is distributed throughout the house by means of water or air using a network of pipes or ducts Water distribution Hot water from a boiler is pumped around a circuit to the heat emitters radiators at a required flow rate to meet the heating de
21. mes There are a number of areas where you can optimise the performance of your heating system when renovating your home or replacing an existing heating system gt Ensure the building is insulated sealed and draught proofed There is little point in incorporating the most energy efficient generation and distribution system if the building is leaky and un insulated allowing the unrestricted flow of energy from the dwelling A poorly insulated house could be losing up to 30 of its heat through its roof alone costing you money and contributing to global warming gt Ensure the heating system is in good working order Ensure the good performance of your heating system through regular maintenance via a qualified boiler service engineer gt Replace defective equipment with an energy efficient and or renewable technology alternative Only once the building fabric and ventilation heat loss have been minimised and you are sure the current heating system is operating inefficiently should investment in a new technology be considered gt Ensure system control is as efficient as possible Make sure your present control system operates efficiently and if possible enhance it in line with the suggestions in this booklet Whatever your decision check www seai ie grants as grants may be available Finding out an appliance s efficiency HARP SEAI s Home Heating Appliance Register of Performance HARP is a performance database of the major
22. mfort Programmer This device controls both the space and water heating systems allowing you to choose when you want the system to operate usually on a daily weekly schedule There are three types of programmers offering varying degrees of control Programmable room thermostat This device combines a time switch and room thermostat and allows you to set different time periods with different target temperatures for space heating Boiler interlock This is an arrangement of the system controls which your electrician can undertake to ensure that the boiler does not fire when there is no heat demand 17 18 Control of the heat distribution system Distributing heat efficiently around your home is just as important as generating it efficiently This section discusses the options available for controlling the distribution of il Zone control i O o Dividing the heating system into separate zones allows it to operate independently in different parts of your house Typical zones might be i the living room ii the rest of the ground floor iii the first floor and iv the domestic hot water storage cylinder Each zone will be switched on only at the times when there is a demand for heat in that area All heating systems should have a separate hot water circuit to allow for the heating of hot water without needlessly heating the home This is a legal requirement of all new buildings Additionally curr
23. n investment based on operational cost saving Biomass systems Biomass boilers burn wood from managed forests to produce hot water for heating and domestic use The wood matter is chipped or compacted into small pellets of uniform size and moisture content Some models offer up to 90 efficiency Chips are slightly less energy efficient but are cheaper to buy Biomass boilers can be fully automatic once installed In order to keep them topped up with fuel some boilers have special hoppers storage tanks which provide enough fuel for months of operation Capacities of up to three tonnes are typical and this may last the average dwelling for a year Storage conditions of the chips pellets are important as their moisture content affects the efficiency of the boiler Chips and pellets produce ash after burning This can be easily removed and spread in the garden as it contains nutrients Pellets and wood chips are bulky products and do require a lot of storage area This should be a consideration in your decision Typically an average year s supply of pellets 3 tonnes will need at least 6m of storage volume while wood chips approximately 4 5 5 tonnes will require between 8 and 10m Heat pump systems Heat pumps release heat that is stored in air ground or water and make it usable for domestic heating applications Although they have higher installation costs than conventional fossil fuel heating systems heat pump system
24. s offer a very energy efficient way of providing heat As heat pumps typically exploit low grade temperature sources they will be more efficient when supplying heat to low temperature emitters e g under floor heating low temperature large area radiators It is also very important that the house is very well insulated and draught proofed You will need to ensure that this is the case if you are considering using these systems in an existing house Heat pumps exploit their heat sources in one of two ways gt Open systems Water from vertical boreholes rivers streams lakes etc is pumped up into the heat pump where useful energy is transferred to the heating system water and the extracted water is then pumped back into the ground A similar principal applies to air source heat pumps see next section gt Closed systems These use a loop of buried plastic pipe as a heat exchanger They are particularly appropriate for underfloor heating in a house as the typical distribution temperature is 30 C to 40 C 10 Air source heat pumps Air source heat pumps heat the interior of a building using air from the outside There are two types of air source heating systems gt Aijr to air systems Provide warm air which is circulated to heat the building gt Air to water heat water to heat a building through radiators or an underfloor system Ground source heat pumps Energy from the sun is stored in the soil As the heat pump sy
25. stem extracts this energy the sun constantly tops it up to maintain a constant temperature all year round Heat is extracted from pipes buried horizontally or vertically in the soil a metre or more deep to ensure that frost cannot damage them The ground above the pipes cannot be planted with large trees or shrubs and care must be taken to ensure it is used in a manner which does not adversely affect the piping system A geo thermal heating system may be used if the dwelling has a large enough area with a suitable soil type around it Water source heat pumps Where there is a sufficiently large body of ground water available close to a house it may be used as a heat source using either an open or closed system For detailed Buyers Guides for renewable technologies visit www seai ie renewables Grants Whatever your decision check www seai ie grants as grants may be available Choosing your conventional space heating system Conventional boiler Gas oil or solid fuel boilers located inside or outside the house heat water which is then distributed by pump or gravity circulation to heat emitters radiators in each room New boilers can achieve good efficiencies minimum seasonal efficiency of 86 when installed commissioned and serviced effectively Distribution pipes for all boilers should be well insulated and waterproofed to minimise heat loss Condensing boiler Condensing boilers burn gas or oil and condense
26. t water and gt free heat from the sun from occupants and household appliances The Annual Heat Demand for a house will determine the required power output of the heat generator to be installed It can be met from two main types of heating systems gt Central heating systems oil gas solid fuel coal or biomass or biomass boilers or heat pumps are used to heat water or air and distribute it throughout the house in pipes or ducts gt Localised heaters open fires electric heaters closed gas fires or stoves are used to provide heating and where equipped with a back boiler hot water The types of central heating generators available to deliver the Annual Heat Demand for your home are detailed in the following sections Information about localised heat generators that produce heat separately in each room can be found in the Heat Emitters section on page 14 Practical advice for heating systems in new homes There are a number of areas where you can optimise the heating system when you are building your new home These will help to minimise the load on the heating system and ensure it operates as efficiently as possible over the building lifecycle gt Site and design the most sustainable building possible Locate the living areas to the southern aspect so that most use can be made of available light and solar energy Also shelter the building from the external elements in a suitable manner Ensure the building is insulate
27. their flue gases to achieve efficiencies of 91 or higher Although more expensive than conventional boilers their lower running costs mean the price difference will be recovered over the boiler s lifetime They emit a harmless plume of water vapour to the atmosphere during operation Please note that as of March 31st 2008 installation of condensing boilers is mandatory in all new dwellings and where practical as a replacement boiler in existing dwellings Cooker and boiler Suitable for large kitchens these appliances burn solid fuel oil or gas to provide cooking ovens and to supply hot water for heating When using solid fuel the flue chimney should be cleaned twice annually and the appliance itself should be cleaned as often as twice weekly particularly if bituminous i e non smokeless coal is used This type of coal produces a lot of slag deposits when burnt These can stick to the boiler surfaces and reduce efficiency Back boiler Open fires are very inefficient perhaps as low as 20 with most heat being lost up the chimney stack By trapping more of the fire s heat energy and using it to provide domestic hot water and space heating a high output back boiler increases the efficiency to approximately 40 50 Solid fuel back boilers must be cleaned frequently as often as twice weekly Open fires Solid fuel and gas open fires while a visually attractive form of heating for Irish homes are extremely inefficient Typical
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