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How to re-pressurise your boiler

How to re-pressurise your boiler

Most boilers require re-pressurising once or twice a year which is to be expected. If you’re having to re-pressurise your boiler frequently this may signify a fault with the boiler/heating system requiring an engineer.

If you would like to check your boiler pressure first ensure your boiler is cold. The pressure should be between 1 and 1.5 bar on the pressure gauge.

When the pressure is too high on your boiler then it is likely there is too much water in your heating system.  If the pressure is too low then the system needs topping up with water to maintain the pressure.

How to re-pressurise your boiler

To re-pressurise your boiler you are simply allowing more water to enter your heating system from the mains water supply by using your filling loop.

Your filling loop could be built into your boiler or it may be external to your boiler. You should firstly consult your boiler manual.  The instructions should demonstrate how to re-pressurise the boiler using the filling loop.

Below is a generalised process that can usually be applied to most boilers.

  1. Switch off your boiler and allow it to cool down.
  2. Ensure that both ends of the filling loop are correctly attached
  3. Open up the valves at each end to allow the mains water in, you will be able to hear this.
  4. Wait for the pressure gauge to reach 1.5 bar
  5. The close both valves, one at a time
  6. You can then switch the boiler back on, you may need to press the reset button

If you are in doubt on how to re-pressurise your boiler or having already re-pressurised yourself you are still having pressure issues, you will require a heating engineer to diagnose and rectify the fault. For further information you can also read our article on ‘why your boiler may need topping up everyday’.

If you have any questions or would like to book an engineer please call 01258 472132 or fill in the form and one of our team will get back to you.


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