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Can you bleed my radiator?

Bleeding a radiator is a common DIY job that can be carried out by yourself. Our handy guide and video takes you though the quick step process.

What do you need? 

  • a radiator bleed key or screwdriver
  • a tray (to collect small amounts of liquid)
  • a large towel 

Step-by-step guide to bleed your heating system 

  1. Set all radiator units wide open (maximum temperature setting) and make sure the boiler fires up so the water gets to circulate inside the ducts and the radiators. Leave your radiators to run at this maximum setting for at least 15 minutes.
  2. Now switch off your central heating system. This will stop any air or water from being pumped around the system. Then wait for at least 10 minutes to let everything cool down.
  3. Proceed to the radiator that is closest to the heating boiler, turn off the radiator valve and place the tray underneath the bleed valve. Be sure to keep a large towel handy.
  4. Position the screwdriver or bleed key onto the bleed valve and turn left until water comes out instead of air. Do not turn the valve open all the way, as chances are you will not be able to close it again.
  5. Close the bleed valve.
  6. Repeat the steps above for each radiator. Start out with the radiator nearest to the heating boiler and work your way up from the lowest floor to the top floor.
  7. Once all radiators have been bled, switch the central heating boiler back on.

  1. Repairs and maintenance

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