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How to Re-pressurise Boiler Safely and Easily

How to re-pressurise boiler

Easy guide on how to re-pressurise boiler

Bleeding a radiator means releasing any trapped air inside it. This helps your heating system work more efficiently. This guide will walk you through safely bleeding your radiators and how to re-pressurise your boiler. If you have any concerns, don’t hesitate to get professional advice from our team.

How to re-pressurise boiler

Keyless Filling Link

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

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    Keyless filling link

    Integral keyed filling link

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

  • Push the filling key firmly into the filling link, making sure the arrow on the key shaft lines up with the open padlock symbol.
  • Turn the key to the right until it stops. Make sure it’s locked and can’t turn 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 let water flow into the system.
  • Watch the pressure gauge on your boiler’s display. When it reaches between 1 and 1.5 bar (zone A), turn the white knob back to the right to close the valve. Be careful not to overtighten.
  • Turn the filling key back to the left until it stops, lining the arrow up with the open padlock symbol again. Then pull the key straight down to remove it. Don’t forget to store the key in the bottom panel.

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    Integral keyed filling link

    Does your boiler lose pressure daily?

    If your boiler keeps losing pressure and you’re topping it up regularly, that’s not normal. Before you start looking for leaks, there’s an important step—check your pressure gauge while your heating is on.

  • Does the pressure gauge rise to a high level before your heating begins to cool down?
  • Do you notice any copper pipes on an outside wall dripping or spraying hot water?

    • If you spot one or both of these signs, it could mean your boiler’s expansion vessel needs recharging or even replacing. This must be carried out by a Gas Safe registered engineer, this fault is very common across all boilers brands. Boiler servicing should include to check and recharge your expansion vessel, so this fault could be repaired by getting your boiler serviced.

    Get your boiler serviced by Hayward Heating, Get in touch with our friendly team.