Head to head
Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW vs Worcester Bosch Greenstar 5800i AW 7kW
The Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kw heat output. The Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW | Worcester Bosch Greenstar 5800i AW 7kW | |
|---|---|---|
| Heat output | 8.5 kW at A-7/W35 | 7.97 kW at 7/35C |
| Refrigerant | R32, 2.2 kg charge | R290 (propane) |
| Dimensions | 1020 x 1050 x 480 mm (H x W x D) | 800 x 1100 x 540 mm (H x W x D) |
| Weight | 98 kg | 143 kg |
| Max flow temperature | 55C (space heating) | 75C |
| ErP rating | 145% (MCS certified) | - |
| Sound power | 58 dBA | - |
| Sound pressure at 1m | 45 dBA | - |
| SCOP | - | 4.54 (MCS, 35C flow) |
| Sound pressure | - | 42 dB(A) |
Sources: Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW, Worcester Bosch Greenstar 5800i AW 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Ecodan PUZ-WM85VAA 8.5kW if...
An 8.5kW R32 monobloc heat pump, the middle unit in the Ecodan PUZ-WM line and a common size for a three-bed house. It runs on a single-phase 220-240V supply, weighs 98 kg and reaches a 55C flow temperature for radiator systems.
Full Ecodan PUZ-WM85VAA 8.5kW specifications →Buy or hire the Greenstar 5800i AW 7kW if...
The larger 5800i AW unit, for a slightly bigger house than the 5kW model while sharing the same cabinet size and 42 dB(A) sound rating. Its R290 refrigerant and 75C flow temperature suit a radiator-based retrofit.
Full Greenstar 5800i AW 7kW specifications →Common questions
What is the difference between the Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW and the Worcester Bosch Greenstar 5800i AW 7kW?
The Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kW heat output; the Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kW heat output.
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