The 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.

1. How to Bleed
a Radiator
The 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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2. 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.

3. 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.

4. Step 3: Locate Bleed Valve
• Locate the bleed valve on the
radiator; this is usually at the
top of one end of the radiator.

5. 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.

6. 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.

7. 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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