How do you bleed a radiator?

Why do you bleed a radiator?

Occasionally you may get air trapped inside your radiators which can cause cold spots which can reduce the efficiency of the radiator. When this occurs you can bleed your radiators, which is a simple task, and this will let out the trapped air within your radiators.

How do you bleed a radiator?

Follow these simple steps to bleed your radiator:

  1. Identify which radiators need bleeding. Turn on your heating and wait for radiators to heat up. You can then check each radiator for any cold spots. Remember to be careful when checking the radiators, they can get very hot and we don’t want you burning yourself.
  2. Get your radiator key. In order to bleed a radiator you will need a radiator key, which is used to open the radiator bleed valve. If you don’t have one already you should be able to buy one at your local hardware store.
  3. Turn off the heating and wait for the radiators to cool completely. Before you start you need to make sure that the heating system is turned on as if it’s turned on it may introduce more air into the system while you’re carrying out the radiator bleeding. It also reduces any chance of you getting burnt whilst carrying out the bleeding.
  4. Open radiator valves. Make sure that both the intake and exit valves are turned to the open position and then you’re ready to start bleeding your radiator. Use your radiator key to open the bleed valve and remember to have a cloth at the ready to collect any water which may come out. You should turn the key anti-clockwise until you hear a hissing which indicates that the trapped air is escaping. The bleed screw shouldn’t be removed completely.
  5. Wait for radiator to stop bleeding. Once you have a steady stream of water coming out your radiator it’s time to stop bleeding the radiator. To do this tighten the bleed valve.
  6. Check your boiler’s pressure. During this process your boilers pressure may have dropped and may need topping up with water. If the pressure is too low some of your radiators may not heat up. You may also wish to do another heat check to make sure that your efforts have been successful.

Do you bleed radiators with the heating on or off?

The heating should be turned off before you start bleeding the radiators and the radiators should be cool enough for you to handle them. Hot air and water will exit the radiator if left on and you will risk burning yourself.

How do you bleed steam radiators

There is no need to bleed steam radiators.

How often do you need to bleed a radiator?

There is no set time period in which you will need to bleed your radiators. We would suggest checking whether you need to bleed your radiators at the beginning of each ‘heating season’. This will help ensure that your heating is ready to efficiently heat your home during the winter.

What is a radiator key used for?

A radiator key is used to bleed a radiator. It turns a valve at the top of the radiator which allows trapped air to escape and run more efficiently.

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