Guide · By property
Heat pump for a 4-bed detached
Larger heat loss, bigger cylinder, more radiator changes. Here's the real install spec for a 4-bed detached in 2026.
A typical UK 4-bed detached needs a 10–14 kW air source heat pump, costs £12,000–£16,000 installed before grant (£4,500–£8,500 net after the £7,500 BUS), and runs at around £1,400–£1,800/year with a SCOP of 4.2–4.5.
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Why the bigger spend
A 4-bed detached has more external wall area, larger heat loss (typically 12–18 kW), and usually needs a 250–300L hot water cylinder rather than the 180L common in semis. Expect 4–8 radiators to be uprated — install labour alone is £3,500–£4,500.
Brands that suit large properties
Vaillant aroTHERM plus, Daikin Altherma 3 H HT and Mitsubishi Ecodan Ultra Quiet all scale cleanly to 14 kW. For 16 kW+ look at Viessmann Vitocal 250-A or a cascade of two units.
Frequently asked questions
- What kW heat pump for a 4-bed detached?
- Most well-insulated 4-bed detached homes need a 10–14 kW unit. Larger or solid-wall properties may need 14–18 kW, sometimes a cascade of two pumps.
- Is one heat pump enough for the whole house?
- Yes, one correctly sized monobloc unit handles a typical 4-bed including hot water. Cascade setups are only needed above ~16 kW or for very large layouts.
- Energy Saving Trust — Heat pump efficiency, running cost and SCOP benchmarks (UK).
- Nesta — How to Heat 28 Million UK Homes — Independent research on heat pump deployment and running costs.
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