Head to head
Glow-worm Energy Combi 30C 30kW vs NIBE S2125 Model 12
The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kw hot water 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
| Glow-worm Energy Combi 30C 30kW | NIBE S2125 Model 12 | |
|---|---|---|
| Dimensions | 700 x 390 x 280 mm | 1070 x 1130 x 820 mm (H x W x D) |
| Weight | 33 kg | 160 kg |
| Hot water output | 30.6 kW | - |
| Central heating output | 25 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Warranty | 7 years | - |
| Hot water flow rate | 12.5 litres per minute | - |
| 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) |
| Max flow temperature | - | up to 75C |
Sources: Glow-worm Energy Combi 30C 30kW, NIBE S2125 Model 12. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 30C 30kW if...
A gas combi boiler with 30.6 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.5 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years. Seasonal efficiency is 94%.
Full Energy Combi 30C 30kW 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 Glow-worm Energy Combi 30C 30kW and the NIBE S2125 Model 12?
The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kW hot water output; the NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output.
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