The energy saving trust estimates that a central heating boiler is responsible for 60% of your household energy bills, so having a more efficient boiler can make a sizeable difference to your bills. Most new condensing boilers are A rated which means their efficiency is 90% or more. The efficiency of your old boiler will depend on a number of factors but typically an old non-condensing boiler would be G rated which means it is less than 70% efficient and could well be 55% -70% efficient. Depending on your gas bill, moving to a more efficient condensing boiler could save £200-300 per year.
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