Best Air Source Heat Pumps (2026)

The air source heat pumps we would buy this year, ranked on how well they perform, what they cost and how well they hold up.

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No. 1

Vaillant · 7kW

One of the most efficient heat pumps on UK sale: natural R290 refrigerant, 65°C flow temperature and a class-leading SCOP, well suited to retrofits.

A4.7 ~£11,000

No. 2

Mitsubishi Electric · 8.5kW R290

The UK's most-installed heat pump, with proven reliability and the deepest installer network, now with an efficient R290 model.

A4.6 ~£11,500

No. 3

Octopus Energy · 6kW

Octopus's own 6kW R290 heat pump, usually fitted by Octopus, and with the £7,500 grant the all-in price often lands close to a new gas boiler.

A4.6 ~£9,500

No. 4

Daikin · 8kW

Delivers up to 70°C flow even in deep cold, making it a strong choice for older homes with existing radiators and high demand.

A4.5 ~£12,000

No. 5

Grant UK · 6kW

UK-climate-optimised monobloc with a long warranty and a strong reputation among independent installers.

B4.4 ~£10,500

No. 6

Samsung · 8kW

Competitive R290 monobloc with 70°C flow and good efficiency, often keenly priced against the big names.

B4.3 ~£11,000