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How To Bleed A Radiator

This web page describes how to ‘bleed a radiator’.


Scroll down to see images and instructions on how to bleed a radiator.


  • Turn the central heating off.
  • Obtain a radiator key; your radiator key may be different to the radiator key in the image below.

Radiator bleed key


  • Insert the radiator key into the bleed valve at the top of the radiator.

Radiator and bleed key


  • Have a rag ready to catch the small amounts of water that will come out of the radiator with the trapped air.
  • Turn the key in small amounts, a 1/4 or 1/2 turn at a time.
  • Turn the key, usually anti-clockwise, to release the trapped air out of the radiator. As soon as water starts to come out turn the key in the opposite direction to close the bleed valve.

Radiator bleed key instructions



Judge Electrical Limited
15 Mulberry Court, Huntington, York, YO32 9TU
Telephone 01904 764845 (Landline), 07919 033113 Mobile)
Email info@judgeelectrical.co.uk
VAT No. 852917405. Company Number 6359328