The size of your Combi Boiler will depend on the size of your home. If you live in a smaller flat, apartment, or house, you'll need a 24 to 27kw Combi Boiler. For three to four bedroom houses, you'll need a 28 to 34kw Combi Boiler. Any larger properties will require a 35 to 42kw Combi Boiler.
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