The most efficient air source heat pumps in the UK (2026)
The most efficient model we track is the LG Therma V R290 Monobloc 12kW, with an MCS SCOP of 5.33 at 35°C: about 5.3 units of heat for every unit of electricity.
Get 3 free quotes from local MCS installersTakes 60 seconds, no obligation.Ranked: top 12 models
| # | Model | Size | SCOP at 35°C (55°C) | Sound power | Installed price (before grant) |
|---|---|---|---|---|---|
| 1 | LG Therma V R290 Monobloc 12kW | 12 kW | 5.33 (3.86) | 49 dB(A) | Price on quote |
| 2 | Grant Aerona3 R32 10kW | 10 kW | 5.20 (3.47) | 64 dB(A) | £8,500 - £13,000 |
| 3 | Ideal Logic Air 8kW | 8 kW | 5.09 (3.63) | 55 dB(A) | Price on quote |
| 4 | LG Therma V R290 Monobloc 9kW | 9 kW | 5.04 (3.75) | 50 dB(A) | Price on quote |
| 5 | Vaillant aroTHERM plus 12kW | 12 kW | 4.88 (3.63) | 60 dB(A) | £11,000 - £16,000 |
| 6 | NIBE S2125-12 | 12 kW | 4.80 (3.71) | 49 dB(A) | Price on quote |
| 7 | NIBE S2125-8 | 8 kW | 4.80 (3.59) | 49 dB(A) | Price on quote |
| 8 | Panasonic Aquarea L Series 9kW | 9 kW | 4.71 (3.57) | 54 dB(A) | Price on quote |
| 9 | Panasonic Aquarea T-CAP M Series 12kW | 12 kW | 4.62 (3.55) | 53 dB(A) | Price on quote |
| 10 | Aira 8kW | 8 kW | 4.62 (3.52) | 56 dB(A) | £14,229 - £19,500 |
| 11 | Mitsubishi Electric Ecodan R290 10kW | 10 kW | 4.62 (3.48) | 55 dB(A) | £10,000 - £14,000 |
| 12 | Ideal Logic Air 10kW | 10 kW | 4.57 (3.65) | 55 dB(A) | Price on quote |
SCOP and sound power from MCS product listings and manufacturer data; maximum flow temperature as the maker publishes it. Installed prices are modelled before the grant; your quote depends on your home. Last checked 2026-10-20.
What to look for
- SCOP is the season-long average, so it predicts your running cost better than a peak COP figure.
- The 35°C figure applies to underfloor heating or upsized radiators; the 55°C figure applies if you keep most of your existing radiators.
- A well-designed install matters as much as the model: flow temperature, emitter sizing and controls set the efficiency you actually get.
Compare the leaders head to head
LG Therma V vs Grant Aerona3SCOP, sound, price and warranty side by sideLG Therma V vs Ideal Logic AirSCOP, sound, price and warranty side by sideLG Therma V vs Vaillant aroTHERM plusSCOP, sound, price and warranty side by sideGrant Aerona3 vs Ideal Logic AirSCOP, sound, price and warranty side by sideGrant Aerona3 vs Vaillant aroTHERM plusSCOP, sound, price and warranty side by sideIdeal Logic Air vs Vaillant aroTHERM plusSCOP, sound, price and warranty side by side
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