heatpumpdatabaseProduct data sheetheatpumpdatabase.com
Octopus Energy Cosy 9
✓ BUS eligible✓ MCS listedAir Source (ASHP)ResidentialHeating only
Heating capacity
9 kW
SCOP
4.36
W50
COP
4.5
A7/W35
Max flow temp
75°C
Sound power
58 dB(A)
Refrigerant
R290
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: MCS HP0255/04
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
✓ MCS listed
Certificate: MCS HP0255/04
| General | |
|---|---|
| Heat pump type | Air Source (ASHP) |
| Application | Residential |
| Refrigerant | R290 |
| Mode | Heating only |
| Heating performance | |
| Heating capacity | 9 kW |
| Max heating output (low temp) | 7.9 kW at A7/W65 |
| COP (heating) | 4.5 at A7/W35 |
| SCOP (heating) | 4.36 at W50 |
| Operating range (air) | from -20 °C |
| Heating flow temperature | up to 75 °C |
| Electrical, acoustic and physical | |
| Electrical supply | 220-240V (Single Phase) |
| Sound power level | 58 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 1125 × 855 × 595 mm |
| Operational Weight | 125 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.