How to bleed a radiator
What you will need
- A Radiator key (please don’t use pliers as you could cause damage to the valve)
- A dry cloth or towel
- A container to catch any water that comes out of the radiator
Before you begin- make sure that your central heating is turned off! The last thing that you want to happen is boiling water bursting out of the pipes.
Before you start
If your house is spread over two or more floors, begin bleeding the downstairs radiators first, beginning with the one furthest away from your boiler. Once all of the downstairs radiators have been bled, move upstairs, again starting with the one furthest away from your boiler.
- Put the container on the floor beneath this area to catch any water.
- 2At the top of your radiator, you should see a square bleed screw. You will need to turn this in order to release air and water from the radiator. You will need to turn the bleed screw ANTI clockwise, use the key to do this, the cloth will help with gripping.
- As the air escapes you will hear a hissing sound. Use the cloth to catch any water. Once the hissing has stopped and there is a trickle of water, the radiator is bled!
- Use the key to tighten back the bleed screw. Don’t screw this too tight as you could cause damage to the valve.
- Wipe down any water on the radiator and move on to the next one, repeating all the previous steps until all of the radiators have been bled.
- Once you have bled all of your radiators, you can turn your heating back on. When you turn it on, check the pressure gauge on the boiler (should be around 1.5). Once the heating is on, check all radiators are heating evenly and there’s no signs of leaking.
You may need to bleed some radiators more than once, and if this still doesn’t fix the problem it’s best to call a heating engineer to inspect the system. You may be advised to replace some radiators which could improve your heating system and reduce your heating bills.
Still having problems with your heating?
If you have tried this step-by-step guide to bleeding a radiator and are still facing issues, give us a call on 01424 200005, email firstname.lastname@example.org or fill in the contact form.