What size boiler for a 5-bed house?

A 5-bedroom home usually needs a 35–42 kW combi boiler (or a system boiler with a cylinder if you have two or more bathrooms).

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Answer

What size boiler for a 5-bedroom house?

A 5-bedroom home usually needs a 35–42 kW combi boiler (or a system boiler with a cylinder if you have two or more bathrooms).

Combi size	35–42 kW
2+ bathrooms	Consider a system boiler + cylinder

2026 figures, based on Energy Saving Trust, Ofgem & gov.uk data · always confirm with a professional survey.

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