How to bleed a radiator

09 January 2024


If you've decided that it is time to bleed the radiators in your home, you can follow this simple step-by-step video to show you how to do it.

When do you need to bleed a radiator?

You will know that your radiators need bleeding if they are taking a while to heat up or have cold patches. They could also be making gurgling noises from any trapped air inside them.

You will need a radiator key and a rag or old cloth to carry out the bleed.

Steps for bleeding your radiators

  • Step 1

    • Turn off your heating and allow your radiators to cool down.
  • Step 2

    • Fit the key into the groove in the valve at the top of the radiator.
  • Step 3
    • Slowly twist the key anti clockwise until you begin to hear a hissing noise. Have your rag ready to catch any drips and as soon as water starts escaping, shut the valve.
  • Step 4

    • Repeat on all of the radiators. When you have done every radiator you can then turn your heating back on again.

By following these steps, you can successfully bleed any trapped air from your radiators. Need boiler cover or repair? We have a range of solutions to help keep your boiler working all year. If you have any further questions or encounter difficulties, don't hesitate to contact our team for assistance.