Head to head
Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW vs NIBE S2125 Model 12
The Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kw heat output. The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW | NIBE S2125 Model 12 | |
|---|---|---|
| Heat output | 8.5 kW at A-7/W35 | 6.80-7.60 kW (average climate), 8.4 kW (cold climate) |
| Sound power | 58 dBA | 49 dB(A) at nominal rating (EN12102) |
| Dimensions | 1020 x 1050 x 480 mm (H x W x D) | 1070 x 1130 x 820 mm (H x W x D) |
| Weight | 98 kg | 160 kg |
| Max flow temperature | 55C (space heating) | up to 75C |
| ErP rating | 145% (MCS certified) | - |
| Refrigerant | R32, 2.2 kg charge | - |
| Sound pressure at 1m | 45 dBA | - |
| SCOP | - | 5.0 at 35C, 3.8 at 55C (average climate); 4.2 at 35C, 3.4 at 55C (cold climate) |
Sources: Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW, NIBE S2125 Model 12. 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 S2125 Model 12 if...
The larger NIBE S2125, sized for a medium house and rated to hold output down to -25C outdoor temperature. It shares its cabinet size with the smaller model but weighs 10 kg more for the larger compressor.
Full S2125 Model 12 specifications →Common questions
What is the difference between the Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW and the NIBE S2125 Model 12?
The Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kW heat output; the NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output.
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