Head to head
Vaillant ecoFIT pure 825 25kW combi vs Vaillant ecoTEC Pro 24kW combi
The Vaillant ecoFIT pure 825 25kW combi comes with 8 years more warranty and runs 0.8 litres a minute more hot water. The Vaillant ecoTEC Pro 24kW combi puts out 6kW more to the radiators.
Last reviewed 13 September 2026
Key differences
- Warranty: the Vaillant ecoFIT pure 825 25kW combi comes with 8 years more warranty.
- Central heating output: the Vaillant ecoTEC Pro 24kW combi puts out 6kW more to the radiators.
- Hot water flow rate: the Vaillant ecoFIT pure 825 25kW combi runs 0.8 litres a minute more hot water.
- Hot water output: the Vaillant ecoFIT pure 825 25kW combi has 2kW more hot water output.
- Seasonal efficiency: the Vaillant ecoFIT pure 825 25kW combi is 1 points more efficient.
Specifications side by side
| Vaillant ecoFIT pure 825 25kW combi | Vaillant ecoTEC Pro 24kW combi | |
|---|---|---|
| Hot water output | 25.2 kW | 23.4 kW |
| Central heating output | 19.1 kW | 24.8 kW |
| ErP class | A | A |
| Seasonal efficiency | 94% | 93% |
| Dimensions | 700 x 390 x 295 mm | 720 x 440 x 338 mm |
| Weight | 32 kg | 38 kg |
| Warranty | 10 years when installed by Vaillant Advance installer | 2 years standard, 7 years with Vaillant Advance registration |
| Hot water flow rate | 10.4 litres per minute | 9.6 litres per minute |
Sources: Vaillant ecoFIT pure 825 25kW combi, Vaillant ecoTEC Pro 24kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the ecoFIT pure 825 25kW combi if...
- you want one that comes with 8 years more warranty
- you want one that runs 0.8 litres a minute more hot water
- you want one that has 2kW more hot water output
- you want one that is 1 points more efficient
A gas combi boiler with 25.2 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: 10 years when installed by Vaillant Advance installer. Seasonal efficiency is 94%.
Full ecoFIT pure 825 25kW combi specifications →Buy or hire the ecoTEC Pro 24kW combi if...
- you want one that puts out 6kW more to the radiators
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 →Common questions
What is the difference between the Vaillant ecoFIT pure 825 25kW combi and the Vaillant ecoTEC Pro 24kW combi?
The Vaillant ecoFIT pure 825 25kW combi comes with 8 years more warranty and runs 0.8 litres a minute more hot water. The Vaillant ecoTEC Pro 24kW combi puts out 6kW more to the radiators. The Vaillant ecoFIT pure 825 25kW combi is a gas combi boiler, 25.2 kW hot water output; the Vaillant ecoTEC Pro 24kW combi is a gas combi boiler, 23.4 kW hot water output.
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