How to repressurise boiler

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How to safely re-pressurise your boiler

Discover how you can safely re-pressurise your boiler

Bleeding a radiator means releasing any trapped air inside it. Doing this helps your heating system run more efficiently and keeps your home warm and cosy. This simple guide will walk you through how to safely bleed your radiators and re-pressurise your boiler. If you’re ever unsure or have any concerns, it’s always best to get advice from a professional.

Safely re-pressurise your boiler

Keyless Filling Link

  • If the needle on your boiler’s pressure gauge is below 1 bar, it’s time to re-pressurise the system.
  • Pull the blue lever down to begin filling the system with water.
  • Keep an eye on the pressure gauge as the pressure rises.
  • Once the needle reaches between 1 and 1.5 bar, release the blue lever to stop filling.

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    Keyless filling link diagram

    Integral keyed filling link

    Locate the filling key and follow these steps to safely re-pressurise your boiler:

  • Push the filling key firmly into the filling link body, making sure the arrow on the key lines up with the open padlock symbol.
  • Turn the filling key to the right until it stops, ensuring it locks in place and can’t turn any further. The arrow should now point to the closed padlock symbol. This connects the two parts of the filling loop.
  • Turn the white knob to the left to allow water to enter and fill the system.
  • Watch the pressure gauge on the boiler’s fascia, and when it reaches between 1 and 1.5 bar (zone A), turn the white knob to the right to close the valve. Be careful not to overtighten.
  • Finally, turn the filling key to the left until it stops, so the arrow lines up with the open padlock symbol, then pull the key straight down to remove it. Don’t forget to store the key safely in the bottom panel.

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    Integral keyed filling link

    Does Your Boiler Lose Pressure Every Day?

    If your boiler keeps losing pressure and you find yourself topping it up regularly, this isn’t normal and shouldn’t be happening. Before searching for leaks in your system, there’s an important step to take: check your pressure gauge while your heating is on.

  • Does your pressure gauge spike to a high level before your heating starts to cool down?
  • Can you see any copper pipes on an outside wall dripping or spraying hot water?

    • If you notice one or more of these signs, it could mean the expansion vessel inside your boiler needs recharging or even replacing. This must be carried out by a Gas Safe registered engineer, This issue is quite common across all boiler brands. A thorough boiler service should include checking and recharging the expansion vessel, so having your boiler serviced could fix this problem.

    Get your boiler serviced by KHS Heating & Plumbing, Get in touch with our friendly team.

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