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Worcester Bosch Greenstar 4000 System Boiler

  • The Greenstar 4000 is perfect for small to medium sized homes with one bathroom, it features a modern new design, an easy-to-use full colour text display and it’s quiet too. The Greenstar 4000 has a wide power range to meet all of your heating and hot water needs, whilst doing so efficiently.

    * Up to a 10 Year guarantee when installed by a Worcester Accredited Installer. Terms and conditions apply.

    The entire Worcester Bosch gas boiler range is able to run on a 20% hydrogen blend - so you can be confident it will run on gas for its lifetime.

    • Wide power range helps to reduce gas consumption and lower energy bills
    • The modern new design comes with an easy to use colour display
    • The quietest Worcester Bosch system boiler, making it easy to live with
    • Features wireless connectivity with the Bosch EasyControl
    • Suitable for homes where the heating system includes a hot water storage cylinder
    • Can be used with Greenskies solar panels for energy and cost savings


    • ErP Efficiency Rating A
    • LPG model available
    • Control Options
    • EasyControl Compatible
    • Solar Compatible
    • Dimensions (mm) height x width x depth: 724 x 400 x 310
    • Quiet Mark certified outputs: 12kW, 15kW, 18kW, 21kW & 24kW

Sound Made Simple

Acoustics Academy’s Sound Made Simple guide clarifies complex acoustic terminology with insights to design with sound.