Head to head
Glow-worm Energy Combi 30C 30kW vs NIBE S2125 Model 8
The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kw hot water 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
| Glow-worm Energy Combi 30C 30kW | NIBE S2125 Model 8 | |
|---|---|---|
| Dimensions | 700 x 390 x 280 mm | 1070 x 1130 x 820 mm (H x W x D) |
| Weight | 33 kg | 150 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 | - | 5.33 kW (average climate), 5.4 kW (cold climate) |
| SCOP | - | 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) |
| Max flow temperature | - | up to 75C |
Sources: Glow-worm Energy Combi 30C 30kW, NIBE S2125 Model 8. 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 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 Glow-worm Energy Combi 30C 30kW and the NIBE S2125 Model 8?
The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kW hot water output; the NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kW heat output.
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