Head to head
Ideal Heating Logic Max Combi C30 30kW vs Vaillant ecoTEC plus 835 35kW combi
The Vaillant ecoTEC plus 835 35kW combi puts out 7kW more to the radiators and has 5kW more hot water output.
Last reviewed 13 September 2026
Key differences
- Central heating output: the Vaillant ecoTEC plus 835 35kW combi puts out 7kW more to the radiators.
- Hot water output: the Vaillant ecoTEC plus 835 35kW combi has 5kW more hot water output.
- Hot water flow rate: the Vaillant ecoTEC plus 835 35kW combi runs 1.9 litres a minute more hot water.
Specifications side by side
| Ideal Heating Logic Max Combi C30 30kW | Vaillant ecoTEC plus 835 35kW combi | |
|---|---|---|
| Hot water output | 30.3 kW | 35 kW |
| Central heating output | 25.6 kW | 32.8 kW |
| ErP class | A | A |
| Seasonal efficiency | 94% | 94% |
| Dimensions | 700 x 395 x 278 mm | 720 x 440 x 372 mm |
| Warranty | 10 years | 10 years with Vaillant Advance Boiler Protection Kit |
| Hot water flow rate | 12.4 litres per minute | 14.3 litres per minute |
| Weight | 28.6 kg | - |
Sources: Ideal Heating Logic Max Combi C30 30kW, Vaillant ecoTEC plus 835 35kW 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...
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 ecoTEC plus 835 35kW combi if...
- you want one that puts out 7kW more to the radiators
- you want one that has 5kW more hot water output
- you want one that runs 1.9 litres a minute more hot water
A gas combi boiler with 35 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 14.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years with Vaillant Advance Boiler Protection Kit. Seasonal efficiency is 94%.
Full ecoTEC plus 835 35kW combi specifications →Common questions
What is the difference between the Ideal Heating Logic Max Combi C30 30kW and the Vaillant ecoTEC plus 835 35kW combi?
The Vaillant ecoTEC plus 835 35kW combi puts out 7kW more to the radiators and has 5kW more hot water output. The Ideal Heating Logic Max Combi C30 30kW is a gas combi boiler, 30.3 kW hot water output; the Vaillant ecoTEC plus 835 35kW combi is a gas combi boiler, 35 kW hot water output.
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