How To Bleed A Radiator

It’s common for air pockets to build up inside your radiators, forming cold spots at the top of your radiators.

Sludge can also build up in your radiators and central heating system. As a result, it’ll take more energy to heat your home and drive up your energy bills.

How can you avoid this? By bleeding your radiators!

Here’s our step-by-step guide on how to do this yourself:

1) Switch your heating system

Let pressure build so that air is pushed around.

2) Inspect your radiators

Feel around for cold spots at the top of the radiators. If you also hear a gurgling sound, the radiator needs bleeding.

3) Switch Off the Heating and Cool Down

Once you know which radiators need to be bled, switch off your central heating system. Then, let the radiators cool down to avoid scalding yourself with hot water or spilling it on the floor.

4) Prepare The Area Around The Radiator

Water is likely to spill out, so lay towels around the radiators that need to be bled. Also, have a container ready to catch any excess water.

5) Open The Valve

Use a bleed key to open the bleed valve, turning it one quarter and a half. Turn it any further, and water may pour out. If you hear a hissing sound, it’s air escaping the radiator.

When the hissing sound stops, drops of water may start appearing. So turn the valve back to the original position, but not too tightly.

Repeat the process for each radiator.

Remember that you’re likely to lose some water from your central heating system. If a large volume of water is lost, check the pressure of the heating system. If it’s pointing to yellow or below, the system requires repressurising.