They work on the same principle as a conventional boiler, with one main difference. Instead of one large, usually cast iron heat exchanger, they have two.
With a new conventional boiler approximately 80% of the gas consumed is converted to either heating or hot water, the remaining 20% gets pumped through the flue terminal, and out to atmosphere. That's at least 20% of your gas bill wasted!!
With condensing boilers, the 20% which would normally get pumped outside is brought back into the system, where the consumer benefits. When fitted as a replacement for a twenty year old wall mounted boiler (i.e. a boiler which is approximately 70% efficient) in an average three bed semi will save the consumer £960.00 in the expected fifteen year life of a boiler.
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