Head to head
NIBE S2125 Model 12 vs NIBE S2125 Model 8
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kw heat output. 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
| NIBE S2125 Model 12 | NIBE S2125 Model 8 | |
|---|---|---|
| Heat output | 6.80-7.60 kW (average climate), 8.4 kW (cold climate) | 5.33 kW (average climate), 5.4 kW (cold climate) |
| SCOP | 5.0 at 35C, 3.8 at 55C (average climate); 4.2 at 35C, 3.4 at 55C (cold climate) | 5.0 at 35C, 3.7 at 55C (average climate); 4.1 at 35C, 3.2 at 55C (cold climate) |
| Sound power | 49 dB(A) at nominal rating (EN12102) | 49 dB(A) at nominal rating (EN12102) |
| Dimensions | 1070 x 1130 x 820 mm (H x W x D) | 1070 x 1130 x 820 mm (H x W x D) |
| Weight | 160 kg | 150 kg |
| Max flow temperature | up to 75C | up to 75C |
Sources: NIBE S2125 Model 12, NIBE S2125 Model 8. Figures vary by model year and options, so check with the supplier before you commit.
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 →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 NIBE S2125 Model 12 and the NIBE S2125 Model 8?
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output; the NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 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.