We break down the basics when it comes to bleeding your radiator

We get it, bleeding a radiator isn’t the funnest thing on your to do list. But if it needs doing then it needs doing right. That’s why we’ve broken down how to bleed your radiator the correct way, first time.

Step 1 – Turn your central heating on

Turn your central heating on full, you must open all of your radiator valves to enable them to heat up to maximum capacity, this will allow the pressure in your system to build and can sometimes naturally force the air out of the system with any intervention.

Step 2 – Find out which radiators need bleeding

Your radiators should now be nice and hot, you now need to go and check each one individually to see if all parts of the radiator are warming up – be careful not to burn yourself as they can get pretty hot! If you find any cool spots towards the top of the radiator then they more than likely need bleeding.

Step 3 – Bleed to radiators

You now need to switch off your central heating and wait for the radiators to cool down fully. To bleed your radiators you require a bleed key (these can be purchased at local DIY shop if you don’t already have one to hand) OR a flat head screwdriver.

At the top of the radiator at one end there will be a valve. You can attach the radiator key to the square bit in the centre or put the end of the screwdriver into the groove. Hold the key or screwdriver with a cloth, and have another cloth ready to catch any drips, then slowly turn the radiator key or screwdriver anti-clockwise – if gas is escaping you’ll hear a hissing sound.
Once there is no more gas, liquid will come out and the valve will need to be closed quickly. With the more modern screwdriver operated escape valve, liquid is likely to emerge as a jet rather than a dribble.

Step 4 – Check the pressure on your boiler

Check the pressure by looking at the gauge on your boiler. Sometimes bleeding radiators can affect the pressure in the boiler and you may need to ‘top it up’ – you can do this by using the tap on the filling loop on your boiler.

The recommended pressure is 1-1.5 on your gauge, similar to the below Worcester image.

We provide all of our customers with their own bleed key to enable them to be able to self care for boilers throughout the year, however if you ever have any questions regarding this we are always happy to get one of our gas engineers to talk you through this process or we can even pop out and see you – just call the office on 0151 482 9519.

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