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Stiebel Eltron HPA-O CS Plus
Model code: HPA-O 08 CS Plus Int
✓ BUS eligible✓ MCS listedAir Source (ASHP)ResidentialHeating & cooling
Heating capacity
2.6–8.5 kW
SCOP
4.5
W35
COP
4.76
A7/W35
Max flow temp
60°C
Sound power
57 dB(A)
Refrigerant
R410A
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: 011-1W0284
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
✓ MCS listed
Certificate: 011-1W0284
| General | |
|---|---|
| Heat pump type | Air Source (ASHP) |
| Application | Residential |
| Refrigerant | R410A |
| Mode | Heating & cooling |
| Heating performance | |
| Heating capacity | 2.6–8.5 kW |
| Max heating output (low temp) | 7.8 kW at A-7/W35 |
| COP (heating) | 4.76 at A7/W35 |
| SCOP (heating) | 4.5 at W35 |
| Operating range (air) | -20 to 40 °C |
| Heating flow temperature | 15–60 °C |
| Cooling performance | |
| Cooling capacity | 3 kW |
| Max cooling output (high temp) | 3 kW at A35/W7 |
| Electrical, acoustic and physical | |
| Electrical supply | 220-240V (Single Phase) |
| Sound power level | 57 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 812 × 1152 × 524 mm |
| Operational Weight | 91 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.