How to Bleed a Radiator

When a radiator is cold at the top or not heating up at all it could be a sign that there is air in the system. To remove the air you will need a bleed key.

Bleed key for bleeding a radiator

Locate the air vent on the radiator, engage the bleed key and gently turn anticlockwise until you can hear the air coming out. Using a paper towel or an old cloth to catch the drips, when the water starts coming out turn the key clockwise taking care not to over tighten.

Photo of a plumber bleeding a modern white rdiator with a bleed key

You may need to top up the pressure on your boiler, please refer to manufacturers instructions on how to do this.

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