Head to head
Vaillant ecoTEC Pro 24kW combi vs Vaillant ecoTEC Pro 30kW combi
The Vaillant ecoTEC Pro 30kW combi has 7kW more hot water output and runs 2.7 litres a minute more hot water.
Last reviewed 13 September 2026
Key differences
- Hot water output: the Vaillant ecoTEC Pro 30kW combi has 7kW more hot water output.
- Hot water flow rate: the Vaillant ecoTEC Pro 30kW combi runs 2.7 litres a minute more hot water.
- Central heating output: the Vaillant ecoTEC Pro 30kW combi puts out 1kW more to the radiators.
Specifications side by side
| Vaillant ecoTEC Pro 24kW combi | Vaillant ecoTEC Pro 30kW combi | |
|---|---|---|
| Hot water output | 23.4 kW | 30 kW |
| Central heating output | 24.8 kW | 25.7 kW |
| ErP class | A | A |
| Seasonal efficiency | 93% | 93% |
| Dimensions | 720 x 440 x 338 mm | 720 x 440 x 335 mm |
| Weight | 38 kg | 39 kg |
| Warranty | 2 years standard, 7 years with Vaillant Advance registration | 2 years standard, 7 years with Vaillant Advance registration |
| Hot water flow rate | 9.6 litres per minute | 12.3 litres per minute |
Sources: Vaillant ecoTEC Pro 24kW combi, Vaillant ecoTEC Pro 30kW combi. Figures vary by model year and options, so check with the supplier before you commit.
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 →Buy or hire the ecoTEC Pro 30kW combi if...
- you want one that has 7kW more hot water output
- you want one that runs 2.7 litres a minute more hot water
- you want one that puts out 1kW 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 12.3 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 30kW combi specifications →Common questions
What is the difference between the Vaillant ecoTEC Pro 24kW combi and the Vaillant ecoTEC Pro 30kW combi?
The Vaillant ecoTEC Pro 30kW combi has 7kW more hot water output and runs 2.7 litres a minute more hot water. The Vaillant ecoTEC Pro 24kW combi is a gas combi boiler, 23.4 kW hot water output; the Vaillant ecoTEC Pro 30kW combi is a gas combi boiler, 30 kW hot water output.
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