Head to head
Glow-worm Energy Combi 30C 30kW vs Vaillant ecoTEC Pro 24kW combi
The Glow-worm Energy Combi 30C 30kW comes with 5 years more warranty and has 7kW more hot water output.
Last reviewed 13 September 2026
Key differences
- Warranty: the Glow-worm Energy Combi 30C 30kW comes with 5 years more warranty.
- Hot water output: the Glow-worm Energy Combi 30C 30kW has 7kW more hot water output.
- Hot water flow rate: the Glow-worm Energy Combi 30C 30kW runs 2.9 litres a minute more hot water.
- Seasonal efficiency: the Glow-worm Energy Combi 30C 30kW is 1 points more efficient.
- Central heating output: the Glow-worm Energy Combi 30C 30kW puts out 0kW more to the radiators.
Specifications side by side
| Glow-worm Energy Combi 30C 30kW | Vaillant ecoTEC Pro 24kW combi | |
|---|---|---|
| Hot water output | 30.6 kW | 23.4 kW |
| Central heating output | 25 kW | 24.8 kW |
| ErP class | A | A |
| Seasonal efficiency | 94% | 93% |
| Dimensions | 700 x 390 x 280 mm | 720 x 440 x 338 mm |
| Weight | 33 kg | 38 kg |
| Warranty | 7 years | 2 years standard, 7 years with Vaillant Advance registration |
| Hot water flow rate | 12.5 litres per minute | 9.6 litres per minute |
Sources: Glow-worm Energy Combi 30C 30kW, Vaillant ecoTEC Pro 24kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 30C 30kW if...
- you want one that comes with 5 years more warranty
- you want one that has 7kW more hot water output
- you want one that runs 2.9 litres a minute more hot water
- you want one that is 1 points more efficient
- you want one that puts out 0kW more to the radiators
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 ecoTEC Pro 24kW combi if...
A gas combi boiler with 23.4 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 9.6 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 2 years standard, 7 years with Vaillant Advance registration. Seasonal efficiency is 93%.
Full ecoTEC Pro 24kW combi specifications →Common questions
What is the difference between the Glow-worm Energy Combi 30C 30kW and the Vaillant ecoTEC Pro 24kW combi?
The Glow-worm Energy Combi 30C 30kW comes with 5 years more warranty and has 7kW more hot water output. The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kW hot water output; the Vaillant ecoTEC Pro 24kW combi is a gas combi boiler, 23.4 kW hot water output.
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