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Is boiler efficiency important when choosing a boiler?

Rhodri Andrews

If you have gas central heating, your boiler will account for around 60% of your home’s CO2 emissions, according to the Energy Saving Trust. This makes your choice of boiler a key priority if you’re looking to cut your energy bills and carbon footprint.

Why are new boilers more efficient?

Modern boilers are more efficient for several reasons, but their main advantage is that they are all condensing boilers. All well-maintained boilers burn their fuel very efficiently, but they inevitably lose some heat in the hot gases that escape up the flue. A condensing boiler has a bigger heat exchanger, so it recovers more heat, sends cooler gases up the flue and is more efficient.

Sometimes the flue gases get so cool that the water vapour in the gas condenses out (hence the name). When this happens, even more energy is recovered from the condensing vapour, and the efficiency gets higher still.

 

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