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Modern boilers can be 90% efficient — older ones may be 65% efficient or less, so that over a third of the fuel you buy is wasted.
Condensing boilers are more efficient than regular boilers. In a small home, a combi boiler will save you space because it doesn’t need a hot water storage cylinder.
Usually, heating systems are over-sized to cater for the worst weather — but they cost more and waste energy. Ask your installer not to oversize the boiler.
Select an A or B rated boiler. With a condensing boiler, ask the installer to make sure that the vent isn’t too close to a window, a plastic drainpipe, or the edge of the roof.
If you already have a boiler, get a heating engineer to check that it’s properly ventilated and working efficiently.
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