We advise bleeding your radiators at the beginning of the heating season, before you really need it. Making sure your boiler and heating system is running at its best without any trapped air before you need it. Experts recommend not turning temperatures too high, this can save you a lot of money when the heating bill comes in. Welcome to Viessmann United Kingdom!
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Watch the Video. Product Registration. Find a new boiler. Heating Advice. Homeowners Professionals. How to bleed a radiator: 8 steps to save you money. Bleeding a radiator? Step-by-step-guide to bleed a radiator How to bleed a radiator video Efficiency tips. Fortunately, you can easily bleed your radiators yourself, making your home cosy and warm. How to bleed your radiator step by step.
Venting heating systems is straightforward, just follow the steps below:. Step one — Turn your heating on Before bleeding, you first need to turn the heating on so that all the radiators warm up. Step two — Identify which radiators need bleeding Go through your whole house checking each radiator for cold spots. Step three — Turn off your central heating. Step four — Prepare the area Water may be discoloured when bleeding an old radiator, by putting old towels down you can save a cleaning job later, especially if you have light carpets!
Step six — Bleed the radiator A quarter to half a turn will be enough, never open the valve fully because once you bleed air from the radiator water will come rushing out. Step seven — Repeat the process on all radiators You will need to bleed all the radiators in your property. Step eight — Check the pressure of your heating system Once you have completed the task of bleeding all your radiators, you will need to re-pressurise your heating system.
To activate the video please click on the play button. On some newer radiators, the bleed valve has a straight groove for a flathead screwdriver.
When you open the bleed valve, the pressure inside the central heating system will force out the trapped air. When all the air has escaped, water will start to come out. The heating must not be on when you actually bleed radiators, but it needs to be on for a while before you start. The system needs to have warm water in it for bleeding radiators, so switch the heating fully off and wait for the radiators to cool a little.
About 20 minutes should be perfect — the time it takes to sit down with a cuppa and a biscuit. Put the radiator key in the bleed valve and hold a rag around the valve with your other hand. Turn the key anticlockwise about half a turn until air hisses from the valve. When water starts to trickle out of the valve, all the air is out.
Turn the radiator key about half a turn clockwise to close the bleed valve. Be careful not to overtighten it as this can damage the valve.
If any water remains around the valve area or has dripped down the radiator, wipe it with a dry cloth to prevent rust. Important information regarding our advice and tips We try to make sure that the information we include in our blog is correct.
With that in mind, we accept no responsibility including loss, damage or injury for your use of the advice on our blog, or the wider website. Skip to content. Login Home. Radiators need bleeding when they have air trapped inside them. This trapped air stops warm water circulating around your radiator. That can make the radiator cold at the top, but warm at the bottom. It can also cost you money, as your bills will be higher.
You might also need to let out trapped air if you have noisy radiators which are making banging, clanking or gurgling noises. You can also watch our short video about bleeding a radiator. Our guide to radiator care explains some of the other common problems you might have.
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