35KW - 42KW

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If you have a large house with up to 20 average size radiators, you most likely need a 35 to 42kW combi boiler. A medium-sized house would be more suited to a 28 to 34kW boiler, while flats or small houses only need a 24 to 27kW boiler. This is just a guide as room sizes vary, but should give you a good idea when discussing your requirements with a heating engineer.

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