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  • Worcester Bosch Help,
• 18/10/2021

How to Repressurise a Heating System with an Internal Filling Key

This video shows you how to repressurise your heating system using your Greenstar gas boiler's internal filling key.

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© 2026 BeSure Group Ltd. Company number 12527359.

*Flush & filters subject to quote.**Wireless thermostat included on all installs where quoted. ªBased on installing a new A-rated condensing boiler in England, Scotland and Wales with a programmer, room thermostat and thermostatic radiator controls (TRVs) in a gas heated detached home from an older G-rated boiler with a programmer and room thermostat. Figures are based on fuel prices as of October 2023. Savings will vary depending on the size and thermal performance of your home. Source: Energy Saving Trust.