The Worcester Bosch Greenstar 4000 Natural Gas System Boiler (21kW) is perfect for small to medium homes, offering powerful yet quiet heating performance that won't break the bank. With its Quiet Mark certification, this boiler provides the warmth you need without the disruptive noise.

Its contemporary design complements stylish home interiors, and the clear colour display ensures straightforward monitoring and control. For added convenience, the boiler can connect wirelessly to a smart thermostat, allowing you to manage your home's temperature from anywhere. A-rated for energy efficiency, it helps keep your energy bills low while delivering reliable warmth, making it an excellent investment for any household.

• Power output: 21kW, ideal for small to medium homes
• Quiet Mark certified for noise-free operation
• Wirelessly connects to smart thermostats
• Contemporary design suits stylish interiors
• Clear colour display for easy control
• A-rated efficiency for low energy bills

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.