Head to head
Vaillant ecoTEC Pro 30kW combi vs Worcester Bosch Greenstar 2000 25kW combi
The Worcester Bosch Greenstar 2000 25kW combi comes with 5 years more warranty and is 1 points more efficient. The Vaillant ecoTEC Pro 30kW combi runs 2.3 litres a minute more hot water and has 5kW more hot water output.
Last reviewed 13 September 2026
Key differences
- Warranty: the Worcester Bosch Greenstar 2000 25kW combi comes with 5 years more warranty.
- Hot water flow rate: the Vaillant ecoTEC Pro 30kW combi runs 2.3 litres a minute more hot water.
- Hot water output: the Vaillant ecoTEC Pro 30kW combi has 5kW more hot water output.
- Seasonal efficiency: the Worcester Bosch Greenstar 2000 25kW combi is 1 points more efficient.
Specifications side by side
| Vaillant ecoTEC Pro 30kW combi | Worcester Bosch Greenstar 2000 25kW combi | |
|---|---|---|
| Hot water output | 30 kW | 25 kW |
| Central heating output | 25.7 kW | 3-24 kW |
| ErP class | A | A |
| Seasonal efficiency | 93% | 94% |
| Dimensions | 720 x 440 x 335 mm | 724 x 400 x 300 mm |
| Weight | 39 kg | 32.1 kg |
| Warranty | 2 years standard, 7 years with Vaillant Advance registration | 7 years when installed with Greenstar System Filter |
| Hot water flow rate | 12.3 litres per minute | 10 litres per minute at 35 C rise |
Sources: Vaillant ecoTEC Pro 30kW combi, Worcester Bosch Greenstar 2000 25kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the ecoTEC Pro 30kW combi if...
- you want one that runs 2.3 litres a minute more hot water
- you want one that has 5kW more hot water output
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 →Buy or hire the Greenstar 2000 25kW combi if...
- you want one that comes with 5 years more warranty
- you want one that is 1 points more efficient
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 litres per minute at 35 C rise of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years when installed with Greenstar System Filter. Seasonal efficiency is 94%.
Full Greenstar 2000 25kW combi specifications →Common questions
What is the difference between the Vaillant ecoTEC Pro 30kW combi and the Worcester Bosch Greenstar 2000 25kW combi?
The Worcester Bosch Greenstar 2000 25kW combi comes with 5 years more warranty and is 1 points more efficient. The Vaillant ecoTEC Pro 30kW combi runs 2.3 litres a minute more hot water and has 5kW more hot water output. The Vaillant ecoTEC Pro 30kW combi is a gas combi boiler, 30 kW hot water output; the Worcester Bosch Greenstar 2000 25kW combi is a gas combi boiler, 25 kW hot water output.
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