heatpumpdatabaseProduct data sheetheatpumpdatabase.com
Heliotherm Groundwater Heat Pump
Model code: HP20S25W-M-BC
✓ BUS eligibleGround Source (GSHP)ResidentialHeating & cooling
Heating capacity
9.3–26.2 kW
COP
6.7
W10/W35
Max flow temp
65°C
Sound power
45 dB(A)
Refrigerant
R290
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: BBA 0136/23
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
No MCS listing recorded.
| General | |
|---|---|
| Heat pump type | Ground Source (GSHP) |
| Application | Residential |
| Refrigerant | R290 |
| Mode | Heating & cooling |
| Heating performance | |
| Heating capacity | 9.3–26.2 kW |
| Max heating output (low temp) | 25.2 kW at W10/W35 |
| COP (heating) | 6.7 at W10/W35 |
| Operating range (air) | 7 to 14 °C |
| Heating flow temperature | up to 65 °C |
| Cooling performance | |
| Cooling capacity | 20.4 kW |
| Max cooling output (high temp) | 20.4 kW at W10/W7 |
| Electrical, acoustic and physical | |
| Sound power level | 45 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 1700 × 600 × 670 mm |
| Operational Weight | 236 kg |
Test conditions: A = outdoor air °C, W = flow water °C (e.g. A7/W35 = 7°C air, 35°C flow). Compare COP and SCOP only at the same conditions.