Head to head
Glow-worm Energy Combi 25C 25kW vs Ideal Heating Logic Max Combi C30 30kW
The Ideal Heating Logic Max Combi C30 30kW comes with 3 years more warranty and puts out 8kW more to the radiators.
Last reviewed 13 September 2026
Key differences
- Warranty: the Ideal Heating Logic Max Combi C30 30kW comes with 3 years more warranty.
- Central heating output: the Ideal Heating Logic Max Combi C30 30kW puts out 8kW more to the radiators.
- Hot water flow rate: the Ideal Heating Logic Max Combi C30 30kW runs 2 litres a minute more hot water.
- Hot water output: the Ideal Heating Logic Max Combi C30 30kW has 5kW more hot water output.
Specifications side by side
| Glow-worm Energy Combi 25C 25kW | Ideal Heating Logic Max Combi C30 30kW | |
|---|---|---|
| Hot water output | 25.7 kW | 30.3 kW |
| Central heating output | 18 kW | 25.6 kW |
| ErP class | A | A |
| Seasonal efficiency | 94% | 94% |
| Dimensions | 700 x 390 x 280 mm | 700 x 395 x 278 mm |
| Weight | 32 kg | 28.6 kg |
| Warranty | 7 years | 10 years |
| Hot water flow rate | 10.4 litres per minute | 12.4 litres per minute |
Sources: Glow-worm Energy Combi 25C 25kW, Ideal Heating Logic Max Combi C30 30kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 25C 25kW if...
A gas combi boiler with 25.7 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.4 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 25C 25kW specifications →Buy or hire the Logic Max Combi C30 30kW if...
- you want one that comes with 3 years more warranty
- you want one that puts out 8kW more to the radiators
- you want one that runs 2 litres a minute more hot water
- you want one that has 5kW more hot water output
A gas combi boiler with 30.3 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.4 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 94%.
Full Logic Max Combi C30 30kW specifications →Common questions
What is the difference between the Glow-worm Energy Combi 25C 25kW and the Ideal Heating Logic Max Combi C30 30kW?
The Ideal Heating Logic Max Combi C30 30kW comes with 3 years more warranty and puts out 8kW more to the radiators. The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kW hot water output; the Ideal Heating Logic Max Combi C30 30kW is a gas combi boiler, 30.3 kW hot water output.
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