Head to head
NIBE S2125 Model 12 vs Worcester Bosch Greenstar 8000 Life 40kW combi
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kw heat output. The Worcester Bosch Greenstar 8000 Life 40kW combi is a gas combi boiler, 40 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| NIBE S2125 Model 12 | Worcester Bosch Greenstar 8000 Life 40kW combi | |
|---|---|---|
| Dimensions | 1070 x 1130 x 820 mm (H x W x D) | 780 x 440 x 365 mm |
| Heat output | 6.80-7.60 kW (average climate), 8.4 kW (cold climate) | - |
| SCOP | 5.0 at 35C, 3.8 at 55C (average climate); 4.2 at 35C, 3.4 at 55C (cold climate) | - |
| Sound power | 49 dB(A) at nominal rating (EN12102) | - |
| Weight | 160 kg | - |
| Max flow temperature | up to 75C | - |
| Hot water output | - | 40 kW |
| Central heating output | - | 40 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 12 years when installed by a Worcester Bosch accredited installer |
| Hot water flow rate | - | 14.3 litres per minute |
Sources: NIBE S2125 Model 12, Worcester Bosch Greenstar 8000 Life 40kW combi. 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 Greenstar 8000 Life 40kW combi if...
A gas combi boiler with 40 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 14.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 12 years when installed by a Worcester Bosch accredited installer. Seasonal efficiency is 94%.
Full Greenstar 8000 Life 40kW combi specifications →Common questions
What is the difference between the NIBE S2125 Model 12 and the Worcester Bosch Greenstar 8000 Life 40kW combi?
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output; the Worcester Bosch Greenstar 8000 Life 40kW combi is a gas combi boiler, 40 kW hot water output.
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