heatpumpdatabaseProduct data sheetheatpumpdatabase.com
Mitsubishi Electric Ecodan R290 Monobloc
Model code: PUZ-WZ85YAA
✓ BUS eligible✓ MCS listedAir Source (ASHP)ResidentialHeating only
Heating capacity
18 kW
SCOP
4.47
W35
COP
2.6
A-7/W35
Max flow temp
75°C
Sound power
54 dB(A)
Refrigerant
R290
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: 037-0159-25-2
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
✓ MCS listed
Certificate: 037-0159-25-2
| General | |
|---|---|
| Heat pump type | Air Source (ASHP) |
| Application | Residential |
| Refrigerant | R290 |
| Mode | Heating only |
| Heating performance | |
| Heating capacity | 18 kW |
| Max heating output (low temp) | 8.5 kW at A-7/W35 |
| COP (heating) | 2.6 at A-7/W35 |
| SCOP (heating) | 4.47 at W35 |
| Operating range (air) | -25 to 46 °C |
| Heating flow temperature | up to 75 °C |
| Electrical, acoustic and physical | |
| Electrical supply | 380-415V (Three Phase) |
| Sound power level | 54 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 1040 × 1050 × 480 mm |
| Operational Weight | 117 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.