Head to head
Daikin Altherma 3 H HT EPRA14DV3 vs NIBE S2125 Model 12
The Daikin Altherma 3 H HT EPRA14DV3 is a r32 monobloc high-temperature air source heat pump, class 14. 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
| Daikin Altherma 3 H HT EPRA14DV3 | NIBE S2125 Model 12 | |
|---|---|---|
| Heat output | 10.17 kW (nominal heating) | 6.80-7.60 kW (average climate), 8.4 kW (cold climate) |
| SCOP | 4.51-4.71 (35C flow), 3.57-3.58 (55C flow) | 5.0 at 35C, 3.8 at 55C (average climate); 4.2 at 35C, 3.4 at 55C (cold climate) |
| Dimensions | 990 x 1270 x 460 mm (H x W x D) (outdoor unit) | 1070 x 1130 x 820 mm (H x W x D) |
| Weight | 146 kg (single-phase) (outdoor unit) | 160 kg |
| Max flow temperature | 70C | up to 75C |
| Refrigerant | R32, 4.2 kg charge | - |
| Sound pressure | 43 dBA (heating) | - |
| Sound power | - | 49 dB(A) at nominal rating (EN12102) |
Sources: Daikin Altherma 3 H HT EPRA14DV3, NIBE S2125 Model 12. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Altherma 3 H HT EPRA14DV3 if...
A high-temperature monobloc heat pump reaching a 70C flow, aimed squarely at replacing a boiler on an existing radiator system without upgrading radiators. Its class 14 size gives around 10.2kW of heat output, suiting a three or four-bed house.
Full Altherma 3 H HT EPRA14DV3 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 Daikin Altherma 3 H HT EPRA14DV3 and the NIBE S2125 Model 12?
The Daikin Altherma 3 H HT EPRA14DV3 is a r32 monobloc high-temperature air source heat pump, class 14; the NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output.
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