Vaillant · 7kW
Vaillant aroTHERM Plus
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
Specs & review
Air Source Heat Pumps
Air source heat pumps take heat from outside air to heat your home and hot water — typically 3–4× more efficient than a gas boiler. The £7,500 Boiler Upgrade Scheme grant brings the cost close to a new boiler. Compare models by output, efficiency (SCOP), flow temperature, noise and warranty.
Mitsubishi Electric · 8.5kW R290
Mitsubishi Ecodan
The UK's most-installed heat pump — proven reliability and the deepest installer network, now with an efficient R290 model.
A4.6 ~£11,500
Specs & review
Octopus Energy · 6kW
Octopus Cosy 6
Octopus's own 6kW R290 heat pump, usually fitted by Octopus — with the £7,500 grant the all-in price often lands close to a new gas boiler.
A4.6 ~£9,500
Specs & review
Daikin · 8kW
Daikin Altherma 3
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
Specs & review
Grant UK · 6kW
Grant Aerona3
UK-climate-optimised monobloc with a long warranty and a strong reputation among independent installers.
B4.4 ~£10,500
Specs & review
Samsung · 8kW
Samsung EHS Gen7
Competitive R290 monobloc with 70°C flow and good efficiency, often keenly priced against the big names.
B4.3 ~£11,000
Specs & review