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 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. Typically 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.
Source:
http://www.seai.ie/Publications/Your_Home_Publications_/Energy_Efficiency/Efficient_Home_Heating_guide.pdf
Condensing boiler Condensing boilers burn gas or oil and condense 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. Typically 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.
Source:
http://www.seai.ie/Publications/Your_Home_Publications_/Energy_Efficiency/Efficient_Home_Heating_guide.pdf
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