How to vent a radiator

Do some of your radiators feel cold at the top and warm at the bottom? If so, this is being most probably caused by air that has been trapped in your radiator. You should be able to fix this  yourself by venting your radiators.

Venting a radiator is a simple, safe and process. Basically it just means opening a small valve on your radiator to allow any trapped air to escape.

Before you vent the radiators, please turn off your central heating system. This will prevent more air from entering the system and damage to the system.

Find the bleed valve this usually has a small grub screw and is located on one side at the top of the radiator.

Place a cup or old rag underneath the bleed valve to catch any excess water. Also be careful as the water that escapes from the radiator may be very hot.

Your radiators should have come with a small radiator key. If you can’t find the radiator key you should be able to buy one any DIY store.

The air vent should be  at the top of one side of your radiator. To vent your radiator, insert the radiator key into this valve or flat screwdriver with some air vents and carefully turn it anticlockwise. The air trapped in your radiator will start escaping with a hissing sound. When water begins to dribble out out the valve you will know that all the air has been removed from the radiator, the proceed to close clockwise not to tight. Your system should have a chemical inhibitor added to your system every 2 -3 years as this helps keep your boiler and central heating system in optimum condition and prevents boiler problems and system failures.

Still need help?

If the problem isn’t resolved by the advice above, or you’d rather not tackle it yourself, just give us a call on 07855 382 189.