How to bleed your radiator

Are your radiators hot at the bottom and cold at the top? This is a sign that your radiators will need bleeding. The cold patches are caused by air being trapped inside the radiator, and getting rid of it is relatively straightforward. You won’t need an engineer to come out to fix this as it’s something that you can easily do yourself. It’s really quick and simple to do and to help, we’ve prepared a step-by-step guide.

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  1. First, switch your heating off and make sure that the radiator is cold.
  2. Put a cloth or container underneath the bleed screw and valve at the top corner of the radiator to capture water.
  • A cloth
  • Plastic container to catch the water from your radiator
  • A radiator key or flat head screwdriver - you’ll need to check your radiators to see which you will need

Automatic bleed valve

If you have a combi boiler or sealed system, you may need to repressurise your boiler after bleeding the radiators.

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