Best Ground Source Heat Pumps by COP
Top 20 of 284 qualifying products · updated 2026-07-29
Ground source heat pumps ranked by their published COP. Test conditions are shown for each product — B0/W35 (brine at 0°C, 35°C flow) is the most common benchmark.
| # | Model | Capacity | COP | Test condition | Refrigerant | Noise |
|---|---|---|---|---|---|---|
| 1 | Heliotherm Groundwater Heat Pump | 7.4–19.9 kW | 6.8 | W10/W35 | R290 | 43 dB(A) |
| 2 | Heliotherm Groundwater Heat Pump | 9.3–26.2 kW | 6.7 | W10/W35 | R290 | 45 dB(A) |
| 3 | Heliotherm Groundwater Heat Pump | 6.2–14.4 kW | 6.6 | W10/W35 | R290 | 40 dB(A) |
| 4 | Kronoterm WPG-30-1 HT | 33.5 kW | 6.25 | W10/W35 | R410A | 58 dB(A) |
| 5 | Heliotherm Groundwater Heat Pump SPIREC | 10.8 kW | 6.1 | W10/W35 | R290 | 40 dB(A) |
| 6 | Kronoterm WPG-60-1 HTT | 35.1–65.2 kW | 6.08 | W10/W35 | R410A | 60 dB(A) |
| 7 | Kronoterm WPG-80-1 HTT | 45.8–85.3 kW | 6.07 | W10/W35 | R410A | 64 dB(A) |
| 8 | Heliotherm Groundwater Heat Pump SPIREC | 24.8 kW | 6 | W10/W35 | R290 | 45 dB(A) |
| 9 | Cool Energy GroundTec GTi6 | 1.74–6 kW | 6 | W7/W35 | R32 | |
| 10 | Kronoterm WPG-40-1 HT | 45.7 kW | 5.98 | W10/W35 | R410A | 56 dB(A) |
| 11 | Cool Energy GroundTec GTi12 | 3.58–12.1 kW | 5.96 | W7/W35 | R32 | |
| 12 | Kronoterm WPG-55-1 HT | 57.2 kW | 5.94 | W10/W35 | R410A | 60 dB(A) |
| 13 | Cool Energy GroundTec GTi24 | 6.9–24.2 kW | 5.94 | W7/W35 | R32 | |
| 14 | Vaillant flexoTHERM | 14.55 kW | 5.82 | B0/W35 | R410A | 49.9 dB(A) |
| 15 | Kronoterm WPG-110-1 HTT | 60.6–112.9 kW | 5.78 | W10/W35 | R410A | 66 dB(A) |
| 16 | Atlantic Geolia | 18 kW | 5.7 | B7/W35 | R410A | 55 dB(A) |
| 17 | Vaillant flexoTHERM | 8.89 kW | 5.62 | B0/W35 | R410A | 45.6 dB(A) |
| 18 | Vaillant flexoTHERM | 11.27 kW | 5.58 | B0/W35 | R410A | 48.5 dB(A) |
| 19 | Atlantic Geolia | 15 kW | 5.38 | B7/W35 | R410A | 56 dB(A) |
| 20 | Atlantic Geolia | 11 kW | 5.29 | B7/W35 | R410A | 57 dB(A) |
Rankings are generated automatically from manufacturer-published data in the Heat Pump Database and refresh as new products are added. Figures come from different manufacturers’ datasheets and certification documents; always confirm specifications with the manufacturer. Products without the relevant published figure are excluded.