The Worcester Bosch Greenstar 4000 Natural Gas System Boiler is expertly crafted for small to medium homes, balancing power and efficiency without the noise or high operating costs. With its Quiet Mark certification, this boiler ensures powerful yet quiet heating, perfect for those seeking peace at home.

Its contemporary design complements stylish interiors, while the clear colour display offers effortless control and monitoring. Connect it wirelessly to a smart thermostat for enhanced management convenience, whether you are at home or away. Rated A for energy efficiency, the Greenstar 4000 helps maintain low energy bills while reliably keeping your home comfortably warm with its 15kW power output.

• Power output: 15kW, ideal for small to medium homes
• Quiet Mark certified for silent operation
• Connects wirelessly to smart thermostats
• Easy control with clear colour display
• A-rated for energy efficiency, reducing costs
• Modern design complements home interiors

When installed by a Worcester Bosch Accredited Installer with a Greenstar System Filter. The Greenstar 1000 and Greenstar 2000 guarantee is available as standard to both loyalty scheme members and non-WAI's, when fitted with any brand of system filter. Terms and conditions apply.