Head to head
Daikin Altherma 3 H HT EPRA16DV3 vs NIBE S2125 Model 8
The Daikin Altherma 3 H HT EPRA16DV3 is a r32 monobloc high-temperature air source heat pump, class 16. The NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Daikin Altherma 3 H HT EPRA16DV3 | NIBE S2125 Model 8 | |
|---|---|---|
| Heat output | 11.57-11.82 kW | 5.33 kW (average climate), 5.4 kW (cold climate) |
| SCOP | 4.51-4.71 (35C flow), 3.57-3.58 (55C flow) | 5.0 at 35C, 3.7 at 55C (average climate); 4.1 at 35C, 3.2 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) | 150 kg |
| Max flow temperature | 70C | up to 75C |
| Refrigerant | R32, 4.2 kg charge | - |
| Sound pressure | 38 dBA at 3m (standard mode), 35 dBA at 3m (low sound mode) | - |
| Sound power | - | 49 dB(A) at nominal rating (EN12102) |
Sources: Daikin Altherma 3 H HT EPRA16DV3, NIBE S2125 Model 8. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Altherma 3 H HT EPRA16DV3 if...
The next size up in the Altherma 3 H HT range at around 11.7kW, still reaching a 70C flow for boiler-replacement jobs. It shares the same outdoor cabinet size and weight as the class 14 unit, so it suits a larger house without a larger footprint.
Full Altherma 3 H HT EPRA16DV3 specifications →Buy or hire the S2125 Model 8 if...
A smaller NIBE S2125 rated to keep working in cold climates, reaching up to 65C flow even at -25C outdoors. It suits a smaller house where cold-weather reliability matters more than raw output.
Full S2125 Model 8 specifications →Common questions
What is the difference between the Daikin Altherma 3 H HT EPRA16DV3 and the NIBE S2125 Model 8?
The Daikin Altherma 3 H HT EPRA16DV3 is a r32 monobloc high-temperature air source heat pump, class 16; the NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kW heat output.
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