Worcester Bosch
Greenstar 4000 25kW combi
Gas combi boiler, 25 kW hot water output
Last reviewed 13 September 2026
Specifications
| Hot water output | 25 kW |
| Central heating output | 25 kW |
| ErP class | A |
| Seasonal efficiency | 94% |
| Dimensions | 710 x 400 x 310 mm |
| Weight | 32.0 kg |
| Warranty | 10 years |
| Hot water flow rate | 10.5 litres per minute |
Figures taken from an established dealer: source. Specifications change by model year and configuration - confirm with the supplier before relying on them.
Who uses it
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%.
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