How to Bleed a Radiator

When your radiator is cold at the top and warm/hot at the bottom then it’s a sign that it needs bleeding. However, if it’s all cold while the other radiators are hot then the valves might be closed, and if that’s not the case then you might have a serious problem that will require a specialist to perform power flushing as it may be clogged or the thermostatic valve might be blocked and will need replacement. Romford Emergency Plumber will help you solve this problem. To bleed the radiator, you will only need a radiator bleeding key and cloth or a cup. If your heating system is sealed, first check whether the pressure on the boiler is between 1.5 – 1.8 bar. If it is lower, then you’ll have to raise it (if you don’t know how to do this then check the later post). If you have a vented central heating system, you do not have to increase the water pressure as this is done automatically from the loft tank, however all conditions must be met, but more on that later. The valve for bleeding the radiator is located on top of the radiator, usually on the right or left side, while for some it may be located at the back. Place a cloth under the bleed valve and gently unscrew the valve until the air escapes. In case you cannot unscrew it, it is probably rusty, and it will need to be replaced, Romford

Emergency Plumber performs such services. As you unscrew the valve and the air escapes from the radiator, wait until the water starts to leak, just beware of your hands as the water can be hot. As soon as the water starts leaking close the bleed valve and check if the pressure in the central heating system is between 1.5 – 1.8 bar. If during bleeding the air stops escaping, and the water is not running yet, you have to close the bleed valve and fill in the pressure in the central heating system and then again proceed to bleed the radiator.

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