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How to Bleed a Radiator

By Jack

22nd Jul 2024

3 mins read

DIY & Technical

If your heating isn’t performing as it should, you may need to bleed your radiator or heated towel rail. In this blog post, we’ll show you how.

Close-up of a radiator valve with a water droplet icon, illustrating the process of how to bleed a radiator for better heating efficiency.

Disclaimer: Take care when diagnosing faults with your heating system. This is only a guide to remove pockets of air trapped in your heating system. If you suspect anything else may be the cause, please consult a qualified professional.

During the summer, when our central heating is generally turned off, air can get trapped in the system. This will result in cool spots in your radiator, hindering performance. To get rid of this trapped air, you will need to bleed your radiator. Despite the slightly alarming terminology, it couldn’t be simpler to do.

As part of our DIY series of  blog posts, we’ll demonstrate how to check and how to bleed your radiator with our easy-to-follow images.

 

Tools you’ll need:

  • Radiator bleeding key

You’ll also need:

  • A cloth or small towel (for excess water)
  • A larger towel (to catch spills)
Illustration showing the tools needed to bleed a radiator: a radiator bleed key, a cloth or small towel for excess water, and a larger towel to catch spills.

Here’s how to check your radiators or heated towel radiators for cold spots

 

  • Turn your central heating on and wait for your radiators to heat up.
  • Making sure not to burn yourself, run your hand down each radiator. A cold spot could mean your radiator needs bleeding.
Illustration showing how to turn off the heating and allow the radiator to cool before bleeding, with thermostat and radiator valve icons for visual guidance.

Here’s how to bleed a radiator or heated towel radiator

 

  • Make sure your heating is switched off, allowing your radiators time to cool down.
  • Locate the valve which can be found towards the top of the radiator.
  • Lay out your larger towel underneath the radiator (directly below the valve) to protect your floor from any spills.
  • While using your cloth or small towel to catch excess water, place the radiator key over the square pin inside the valve and turn it anti-clockwise until you hear a hissing noise.
Placing towels underneath a radiator bleed valve to catch spills when bleeding a radiator.
  • When water begins to leak out, turn the valve to the closed position.
Using a radiator key to turn the bleed valve and release trapped air from a radiator.

Congratulations, you have now bled your radiator! The process is exactly the same for a heated towel radiator.

 

More easy bathroom fixes

 

At Victorian Plumbing, you’ll discover loads of expert bathroom advice, including quick fixes you can easily do yourself.

Head to our site to find our full range of blogs.

Jack Jones

Jack

Jack is part of the resident bathroom bloggers team here at Victorian Plumbing. As a bathroom décor and DIY expert, he loves writing in depth articles and buying guides and is renowned for his expert 'how to' tutorials.

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