4 easy steps to bleed your radiator

Step 1: Turn your heating on and get your radiators hot
Turn on the heating so that all radiators in your home come on – you may need to turn up the temperature on your thermostat and individual radiator temperature controls to make sure they all come on.

Remember to wait until your radiators are fully heated before moving on to step two. You need to build up the pressure inside the radiator to be able to force the air out.

Step 2: Find out which radiators need bleeding
Once your radiators are all hot, go and check each one individually to see if all parts of the radiator are warming up. Be careful – radiators can get very hot and you don’t want to burn yourself.

Cool spots, particularly towards the top of the radiator, mean that there could be air or gas trapped and therefore you’ll need to bleed that radiator.
Air or gas is more likely to get trapped in the highest radiator in the home. It can also sometimes get trapped in the coil that runs through the hot water cylinder, as that can often be the highest point in the system. Once you’ve found your cool spots it’s time to move onto step three and bleed them.

Step 3: Bleed the radiators
Before you bleed any radiators make sure your central heating is switched off. This is reversing the process identified in step one and will allow you to handle the radiators without burning yourself or soaking your floor. Bleeding radiators usually requires a radiator key, as pictured above.

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. Hold the key with a cloth, and have another cloth ready to catch any drips, then slowly turn the radiator key 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. Be sure to unscrew the radiator pin SLOWLY and only a turn or two, do not turn the whole way out, as this may cause problems and water leaking everywhere.

Step 4: Check the pressure
Check the pressure by having a look at the gauge on your boiler. If the pressure is too low, you’ll need to ‘top up’. You can do this using the lever or tap on your boiler, known as the filling loop.

Afterwards, you may want to run another ‘hot test’ to check that your efforts have been successful. Simply turn your heating on, wait for all the radiators to heat up and check for any cool spots.

If you are still having trouble bleeding your radiators or if you turned the valve too far and are currently doing backstrokes in your bedroom, call 020 7350 2511 or check out WPJ Heating and connect with us Facebook or Twitter.

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