The Worcester Bosch Greenstar 2000 GR2301iW 25 C NG combi boiler is ideally suited for small-medium, single bathroom properties. Fully compatible with Worcester wireless RF controls, and third party external 230V controls, this combi offers ErP A-rated levels of efficiency alongside excellent reliability. Modulating down to 3kW, the Greenstar 2000 is a great option for homeowners looking to reduce gas consumption. This model is Quiet Mark accredited, operating at just 47dB (A) , and boasts the Which Best Buy Award. Complete peace of mind is provided with a 7-year guarantee when installed with any system filter.