Head to head
Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW vs Vaillant aroTHERM plus 5kW
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 5kW is a r290 monobloc air source heat pump, 5 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW | Vaillant aroTHERM plus 5kW | |
|---|---|---|
| Heat output | 8.5 kW at A-7/W35 | 5 kW |
| Refrigerant | R32, 2.2 kg charge | R290 (propane), low GWP |
| Sound power | 58 dBA | 53 dB(A) at A7/W35, 58 dB(A) at A7/W55 |
| Dimensions | 1020 x 1050 x 480 mm (H x W x D) | 965 x 1100 x 450 mm (H x W x D) |
| Weight | 98 kg | 128 kg (operating) |
| Max flow temperature | 55C (space heating) | 75C |
| ErP rating | 145% (MCS certified) | - |
| Sound pressure at 1m | 45 dBA | - |
| SCOP | - | up to 5.03 |
Sources: Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW, Vaillant aroTHERM plus 5kW. 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 5kW if...
The smallest aroTHERM plus, sized for a well-insulated flat or small house. It uses the natural refrigerant R290 rather than an F-gas, and reaches a 75C flow temperature, which helps it work with existing radiators on a retrofit job.
Full aroTHERM plus 5kW specifications →Common questions
What is the difference between the Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW and the Vaillant aroTHERM plus 5kW?
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 5kW is a r290 monobloc air source heat pump, 5 kW heat output.
GetBrent is an independent directory and is not a dealer for, nor affiliated with, either manufacturer. Model and brand names are the trademarks of their owners.