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How to Bleed a Heating Radiator

Does banging in the pipes sound like someone's running a sledge hammer? Try this easy do-it-yourself fix.


  • Step 1: Turn off the heat Turn off the heat and wait until the radiator cools.
  • Step 2: Locate the valve Locate the bleed valve. It is a circular valve with a square protrusion from its center.
  • Step 3: Hold towel Hold the towel beneath the valve to catch any water that leaks out.
  • Step 4: Insert and turn Insert the bleed key and turn it one-quarter turn counter-clockwise. When you hear the hissing of released air, you have successfully opened the valve.
  • Step 5: Close valve Turn the valve one-quarter turn clockwise once the hissing has ceased and the first drop of water exits the valve.
  • Step 6: Turn on heat Turn the heat back on and listen to hear if the noise in the pipes has dissipated.
  • TIP: Bleed your radiator every six months as preventative maintenance.
  • Step 7: Contact a professional Contact a professional heating expert if problems persist.
  • FACT: Did you know? Doris Day sang the song "Steam Heat" in the 1957 movie version of The Pajama Game.

You Will Need

  • A radiator
  • A towel
  • A bleed key

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