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How to bleed a radiator

Bleeding radiator is a great way to increase central heating efficiency and reduce energy bills.

When you bleed your radiators you helping to remove any excess of air trapped in radiators. Air inside can cause cold spots on radiator surface and reduce efficiency of your central heating system. Trapped air in the heating pipework can also cause some of the radiators to stop working completely. That’s happen if the heating system is not correctly sized, or is done in funny way so the water flow is restricted. Air can create like air socket somewhere on installation via which water can’t flow.

Radiators works alongside the boiler and if they not working properly boiler not working properly too.

Bleeding radiators is a quiet simple task and one you can do yourself. However if you don’t feel confident give Sure Services engineers a call to help you out.

What tools do you need? Bleeding key and some cloth or paper towel.

Let’s start.. Switch your heating on first. Some engineers recommend to bleed radiators when central heating is off and cold but we think it should be on and warm. When system is warm pressure increasing, water flowing via the system and you can do the job much quicker and with better result. Leave the system to heat up.

When heating is on walk around the house and open radiator valves (both sides) on each radiator.

Then check each radiator individually. You should see which are heating up properly and which are not. When doing that you have to be careful as some of them can works as they should and they can be very hot!

If you found cool spots especially on the top of radiator that mean there can be trapped air inside. Take the key and start bleeding.

At the top of each radiator you will find a bleed valve or nipple. Just put the key there and turn anticlockwise. Keep the towel close to catch the drips. You should hear air coming out. If there is a water coming straight away just shut the valve. If you see water and no air radiator is fine.

Next thing you will need to do is to check the pressure on your boiler gauge. If it comes down below 1 bar you need to fill it up to 1,5 bar. Check all your radiators and repeat what you just done.

You can see how to re pressurise boiler on our website here.

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