Head to head
Ideal Heating Logic Max Combi C30 30kW vs Worcester Bosch Greenstar 4000 25kW combi
The Ideal Heating Logic Max Combi C30 30kW has 5kW more hot water output and runs 1.9 litres a minute more hot water.
Last reviewed 13 September 2026
Key differences
- Hot water output: the Ideal Heating Logic Max Combi C30 30kW has 5kW more hot water output.
- Hot water flow rate: the Ideal Heating Logic Max Combi C30 30kW runs 1.9 litres a minute more hot water.
- Central heating output: the Ideal Heating Logic Max Combi C30 30kW puts out 1kW more to the radiators.
Specifications side by side
| Ideal Heating Logic Max Combi C30 30kW | Worcester Bosch Greenstar 4000 25kW combi | |
|---|---|---|
| Hot water output | 30.3 kW | 25 kW |
| Central heating output | 25.6 kW | 25 kW |
| ErP class | A | A |
| Seasonal efficiency | 94% | 94% |
| Dimensions | 700 x 395 x 278 mm | 710 x 400 x 310 mm |
| Weight | 28.6 kg | 32.0 kg |
| Warranty | 10 years | 10 years |
| Hot water flow rate | 12.4 litres per minute | 10.5 litres per minute |
Sources: Ideal Heating Logic Max Combi C30 30kW, Worcester Bosch Greenstar 4000 25kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Logic Max Combi C30 30kW if...
- you want one that has 5kW more hot water output
- you want one that runs 1.9 litres a minute more hot water
- you want one that puts out 1kW more to the radiators
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 →Buy or hire the Greenstar 4000 25kW combi if...
A gas combi boiler with 25 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.5 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 Greenstar 4000 25kW combi specifications →Common questions
What is the difference between the Ideal Heating Logic Max Combi C30 30kW and the Worcester Bosch Greenstar 4000 25kW combi?
The Ideal Heating Logic Max Combi C30 30kW has 5kW more hot water output and runs 1.9 litres a minute more hot water. The Ideal Heating Logic Max Combi C30 30kW is a gas combi boiler, 30.3 kW hot water output; the Worcester Bosch Greenstar 4000 25kW combi is a gas combi boiler, 25 kW hot water output.
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