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By law all new gas and oilfired boilers in the

By law, all new gas and oil-fired boilers in the uk now have to be condensing boilers (with a few exceptions) a condensing boiler is one that saves energy by reusing the heat it would otherwise lose. As opposed to the heat-only boilers, combi and system boilers have the expansion tank and circulation pump already built-in, which makes the installation quicker combi boilers generate hot water on demand and do not require water tank or a cylinder.

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