heatpumpdatabaseProduct data sheetheatpumpdatabase.com
Hitachi airH2O 800 R290
Model code: RASM-2VTW2E
✓ BUS eligibleAir Source (ASHP)ResidentialHeating & cooling
Heating capacity
4 kW
SCOP
4.5
W35
Max flow temp
75°C
Sound power
55 dB(A)
Refrigerant
R290
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: 041-K002-76 a
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
No MCS listing recorded.
| General | |
|---|---|
| Heat pump type | Air Source (ASHP) |
| Application | Residential |
| Refrigerant | R290 |
| Mode | Heating & cooling |
| Heating performance | |
| Heating capacity | 4 kW |
| Max heating output (low temp) | 3.5 kW at A-7/W35 |
| SCOP (heating) | 4.5 at W35 |
| Heating flow temperature | up to 75 °C |
| Cooling performance | |
| SEER (cooling) | 3.45 at W7 |
| Electrical, acoustic and physical | |
| Electrical supply | 220-240V (Single Phase) |
| Sound power level | 55 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 800 × 1220 × 430 mm |
| Operational Weight | 90 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.