Worcester Bosch’s Greenstar combi range sits in the mainstream end of the market, competing with the likes of Vaillant ecoTEC and Ideal Logic for homes that want a single wall hung unit for heating and hot water. This listing covers the Greenstar 2000 25kW, with larger 30kW and 36kW alternatives in the 4000 and 8000 lines, supplied and fitted by British Gas, so you are buying an installed package rather than a box on a pallet.
Which output should you be looking at?
In simple terms, the kW rating affects how quickly you can get hot water at the tap and how comfortably the boiler can keep up with demand. A 25kW combi is commonly aimed at smaller properties with one bathroom, while stepping up to 30kW or 36kW can make more sense if you have higher hot water use, multiple showers, or you want more headroom at busy times. Your installer should size it properly based on your radiators, insulation and water pressure.
- Greenstar 2000 (25kW): entry level in the range, geared towards typical smaller homes.
- Greenstar 4000 (30kW) and 8000 (36kW): higher output options for greater hot water demand.