What size heat pump for a detached house?

Roughly 10–14 kW, confirmed by an MCS heat-loss survey.

A detached house typically needs a 10–14 kW air-source heat pump. More external wall area means a larger unit.

Older, solid-wall homes lose more heat, so insulation and correctly-sized radiators matter as much as the heat pump itself.

Estimated size	10–14 kW
First step	Insulation + heat-loss survey

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

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