The Greenstar 4000 is designed for small to medium sized homes with one bathroom, it is a direct replacement for the Greenstar i range. It features a sleek new look, an easy to use full colour text display and is very quiet too. The Greenstar 4000 has a range of power outputs to meet a variety of heating and hot water needs. Available in both natural gas and LPG. The 4000 comes in two Combi models - 25kW and 30kW with hot water flow rates up to 12.3 l/min.