Gas Boiler Energy Efficiency
Energy efficiency how does it affect me?
Under Part L of the building regulations all new gas boiler installations or replacement boilers need to be high efficiency Condensing boilers. Where necessary Heating controls and systems will also have to be updated, such as converting from a gravity fed system to a fully pumped system, controls fitted such as TRV's fitted to Radiators and an Auto by pass valve fitted where specified. Any property with floor area exceeding 150M² will require Zone controls. Boiler selection will be based on the whole house boiler sizing method as specified under SAP ratings.
What is a condensing boiler?
A condensing boiler is a high efficiency modern boiler
that incorporates an extra heat exchanger. This allows the hot exhaust gases
to lose much of their energy pre-heating the water in the boiler system.
When working in condensing mode, the water vapour produced in the combustion
process condenses back into liquid form releasing the 'latent heat' of
vaporisation into warming the incoming water supply. A side effect of this
process is known as condensate, which is usually mildly acidic, has to be
piped away to a drain or soak away. Another side effect is known as pluming.
Who makes condensing boilers?
All the Major manufacturers make Condensing boilers, even a majority of the oil fired boiler manufacturers produce condensing boilers even though mandatory condensing boilers are required until 2007.All boilers are rated using SEDBUK, a useful guide to the efficiency of boilers called the 'little blue boiler book' is available.
What are TRV's?
Thermostatic radiator valves (or TRVs for short) will add to the effectiveness of any control system. TRVs will allow control of individual room temperature by gradually closing down a radiator if a room starts to overheat due to adventitious heat gains (e.g. sunshine). A TRV should not be fitted to the radiator located in the same room as the controlling room thermostat.
Programmable room thermostats
Provides greater control and energy savings ove a normal room thermostat. Being programmable allows it to meet the use of the room with heating on off or low dependant on the room usage.
What is SAP?
SAP is the government's Standard Assessment Procedure for energy rating a dwelling.
('Seasonal Efficiency of Domestic Boilers in the UK') is the preferred measure of the seasonal efficiency of a boiler installed in typical domestic conditions in the UK, and is used in SAP assessments and the Building Regulations.
Why are boilers targeted?
Boilers are amongst the least energy efficient appliances in your home, they alone account for up to a third of all domestic CO2 emissions. As the current lifespan of a boiler is 10-15 years, making the wrong decision about what boiler to have really could waste considerable amounts of your money and contribute to climate change.
A heating system that uses a high efficiency condensing boiler with the correct heating controls can save you as much a 40% on your heating bills. It really is time to consider whether you have the right boiler.
All homeowners will be responsible for ensuring central heating work in their home complies with the relevant Building Regulations. Your local authority must be told when you have a new or replacement boiler fitted. Your installer should do this for you and will arrange for you to receive a certificate to confirm that the new boilers conform to building regulations.
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Gas Safe Central Heating Ltd.
Highfield House, 1562, Stratford Road, Birmingham, West Midlands. B28
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