Image courtesy of Octopus Energy · click photo to enlarge
Octopus Energy Cosy 9
Specifications and technical data
✓ BUS eligibleAir Source (ASHP)ResidentialR2909 kW
| Manufacturer | Octopus Energy |
|---|---|
| Model | Cosy 9 |
| Model code | None |
| Heat pump type | Air Source (ASHP) All Air Source heat pumps → |
| Application | Residential All Residential heat pumps → |
| Refrigerant | R290 All R290 heat pumps → |
| Mode | Heating only |
| 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 supply | 220-240V (Single Phase) |
| Dimensions (H×W×D) | 1125 × 855 × 595 mm |
| Operational Weight | 125 kg |
| Sound power level | 58 dB(A) (Sound Power LW(A)) |
| Data added | 21/06/2026 |
| Data source | Manufacturer Data Sheet |
| Verification | Verified by a human |
| Boiler Upgrade Scheme | ✓ BUS eligible — Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026). Grant also needs an MCS-certified installer and a qualifying system design. Funding guide |
| PEL certificate no. | MCS HP0255/04 |
| MCS certification | ✓ MCS listed |
| MCS certificate no. | MCS HP0255/04 |
| MCS listing | View on MCS ↗ |
| Real-world performance data | View on HeatpumpMonitor.org ↗ |
Check noise at a neighbour’s window (MCS 020 a) →
Octopus Energy Cosy 9 is a 9 kW air source heat pump, using R290 refrigerant.
Where to buy (UK)
| Availability | Direct sales from manufacturer: Octopus Energy |
|---|
✎ Suggest a correction to this data
Data is compiled from manufacturer sources and may contain errors or gaps. Always confirm specifications with the manufacturer before making decisions.
Reviews & further reading
- Manufacturer Cosy Heating — Octopus Energy
- Manufacturer Octopus heat pumps: smarter, cleaner, cosier home heating — Octopus Energy
- Review Octopus Heat Pump Review: how the Cosy system stacks up — The Independent
- Review Octopus Cosy Heat Pump Review 2026: Is It Worth It? — Heatable
- Review Octopus Cosy 6 Air Source Heat Pump — Heat Pump HQ
- Real-world data Real-world performance: Octopus Cosy 9kW — HeatpumpMonitor.org3 monitored systems listed (Sept 2026)
►What to expect from your heat pump installation with OctopusOctopus Energy
►Inside Octopus Energy's Cosy heat pump factoryOctopus Energy
►First Look: Octopus Energy Cosy 6 Heat Pump Install!Nicolas Raimo
►How Much Did My Octopus Cosy 9 Heat Pump Installation Cost? [2025 UK Price Breakdown]Switched On Network
►One month in. Octopus Heat Pump. Costs. Mistake or not?KK AND EVAlternatives to consider
Three Air Source (ASHP) heat pumps from other manufacturers closest in capacity to this one.
BoxAir Inverter Split
MasterTherm · 1BA26IS-11
- Capacity
- 3–9 kW
- SCOP
- 4.29 (W35)
- Sound power
- 55 dB(A)
- Refrigerant
- R410A
- Price
- ~£9,086.40
Ixtra M
Atlantic · Ixtra M 9
- Capacity
- 9 kW
- SCOP
- 4.45 (W35)
- Sound power
- 53 dB(A)
- Refrigerant
- R452B
Monobloc
Peak · PEP-M09
- Capacity
- 9 kW
- SCOP
- 3.55 (W35)
- Sound power
- 61 dB(A)
- Refrigerant
- R410A
More from Octopus Energy
Other Air Source (ASHP) heat pumps
H-600 CO₂
ASHP · 300–600 kW
H-1200 CO₂
ASHP · 600–1200 kW
H-1800 CO₂
ASHP · 900–1800 kW
H-2600 CO₂
ASHP · 1500–3000 kW
NX-Q-G06
ASHP · 157.5 kW
NX-Q-G06
ASHP · 174.6 kW
Compare with other products
Open the interactive database →
The Octopus Energy name and logo are trademarks of their respective owner and are used here for identification purposes only.