How to Bleed

a RadiatorThe regular heating and cooling of water can cause a build-up of trapped air in your radiator. Our simple step-by-step guide will help you bleed this air from your radiator.

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Step 1: Check Radiator

• Firstly you should check if your radiator requires bleeding. Turn on your central heating.

• When the radiator has been on for about 15 minutes, place your hand on the radiator.

• If it is cold at the top and hot at the bottom, it is likely to have trapped air and requires bleeding.

Step 2: Open Thermostatic Valve

• Open the thermostatic valve to the highest setting, which is usually the fifth setting. This will allow the air to bleed from the radiator more efficiently.

Step 3: Locate Bleed Valve

• Locate the bleed valve on the radiator; this is usually at the top of one end of the radiator.

Step 4: Prepare Floor Area

• Place an absorbent cloth or rag directly under the valve to collect any water that spills during bleeding.

• You may also want to spread more out on the ground near the valve for added protection against water that may spurt out.

Step 5: Open Valve

• Using your radiator bleed key, open the bleed valve by twisting it about a quarter of a turn anti-clockwise until you hear a hissing sound.

• This is the sound of air escaping from the radiator successfully. When the hissing stops and drops of water start spitting out, close the bleed valve tightly by turning the key in a clockwise direction.

Step 6: Close Valve & Check Radiator

• Wipe away any excess water, some of which may be dirty.

• Ensure the radiator has been fully bled by checking it is hot all over.

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