Head to head
Glow-worm Energy Combi 30C 30kW vs Vaillant ecoFIT pure 830 30kW combi
The Vaillant ecoFIT pure 830 30kW combi comes with 3 years more warranty and puts out 2kW more to the radiators. The Glow-worm Energy Combi 30C 30kW runs 0.3 litres a minute more hot water and has 1kW more hot water output.
Last reviewed 13 September 2026
Key differences
- Warranty: the Vaillant ecoFIT pure 830 30kW combi comes with 3 years more warranty.
- Central heating output: the Vaillant ecoFIT pure 830 30kW combi puts out 2kW more to the radiators.
- Hot water flow rate: the Glow-worm Energy Combi 30C 30kW runs 0.3 litres a minute more hot water.
- Hot water output: the Glow-worm Energy Combi 30C 30kW has 1kW more hot water output.
Specifications side by side
| Glow-worm Energy Combi 30C 30kW | Vaillant ecoFIT pure 830 30kW combi | |
|---|---|---|
| Hot water output | 30.6 kW | 30 kW |
| Central heating output | 25 kW | 26.5 kW |
| ErP class | A | A |
| Seasonal efficiency | 94% | 94% |
| Dimensions | 700 x 390 x 280 mm | 700 x 390 x 295 mm |
| Weight | 33 kg | 33 kg |
| Warranty | 7 years | 10 years when installed by Vaillant Advance installer |
| Hot water flow rate | 12.5 litres per minute | 12.2 litres per minute |
Sources: Glow-worm Energy Combi 30C 30kW, Vaillant ecoFIT pure 830 30kW 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 runs 0.3 litres a minute more hot water
- you want one that has 1kW more hot water output
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 ecoFIT pure 830 30kW combi if...
- you want one that comes with 3 years more warranty
- you want one that puts out 2kW more to the radiators
A gas combi boiler with 30 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.2 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years when installed by Vaillant Advance installer. Seasonal efficiency is 94%.
Full ecoFIT pure 830 30kW combi specifications →Common questions
What is the difference between the Glow-worm Energy Combi 30C 30kW and the Vaillant ecoFIT pure 830 30kW combi?
The Vaillant ecoFIT pure 830 30kW combi comes with 3 years more warranty and puts out 2kW more to the radiators. The Glow-worm Energy Combi 30C 30kW runs 0.3 litres a minute more hot water and has 1kW more hot water output. The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kW hot water output; the Vaillant ecoFIT pure 830 30kW combi is a gas combi boiler, 30 kW hot water output.
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