Head to head
Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW vs Vaillant aroTHERM plus 10kW
The Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kw heat output. The Vaillant aroTHERM plus 10kW is a r290 monobloc air source heat pump, 10 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW | Vaillant aroTHERM plus 10kW | |
|---|---|---|
| Heat output | 8.5 kW at A-7/W35 | 10 kW |
| Refrigerant | R32, 2.2 kg charge | R290 (propane), low GWP |
| Max flow temperature | 55C (space heating) | 75C |
| ErP rating | 145% (MCS certified) | - |
| Sound power | 58 dBA | - |
| Sound pressure at 1m | 45 dBA | - |
| Dimensions | 1020 x 1050 x 480 mm (H x W x D) | - |
| Weight | 98 kg | - |
| SCOP | - | up to 5.03 |
Sources: Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW, Vaillant aroTHERM plus 10kW. 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 aroTHERM plus 10kW if...
The larger aroTHERM plus, sized for a bigger house with a higher heat loss. It keeps the same R290 refrigerant and 75C maximum flow temperature as the smaller units in the range, so it can usually work with existing radiators.
Full aroTHERM plus 10kW specifications →Common questions
What is the difference between the Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW and the Vaillant aroTHERM plus 10kW?
The Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kW heat output; the Vaillant aroTHERM plus 10kW is a r290 monobloc air source heat pump, 10 kW heat output.
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