The Worcester Bosch Greenstar 4000 combi boiler is designed for attractive aesthetics, improved installation, and excellent performance. It is ERP A rated for energy efficiency and water heating efficiency. This 30 kW condensing combi boiler features an intuitive display panel for ease of use. Ideal for small to medium-sized homes with one bathroom, it offers quiet operation and a full-colour text display. Its wide power range efficiently meets all heating and hot water needs. The Greenstar 4000 is built upon the successful features of the Greenstar i, offering a transformed appearance, performance, and installer benefits. Installation, commissioning, and servicing are faster and easier, with improvements in efficiency and control. It offers simple switching to previous Worcester i Junior and Si models with a pre-piping jig providing rear piping as standard. Flexibility in siting is provided by long flue lengths (up to 12m with 60/100mm flues), a 500ml integrated condensate siphon to reduce freezing risk, and the ability to provide full hot water flow rates in low water pressure areas. End users benefit from a 10-year heat exchanger and a 7-year product guarantee as standard. The wide modulation range optimises efficiency during low heating demand. Its high-end design, quiet operation (up to 45dB(A)), and intuitive, long text, colour boiler display offer optional intelligent filling solutions. This product should only be installed by a Gas Safe registered engineer. Returns are not accepted on unwanted boilers for safety reasons.