How to drain the heating system

When it is necessary to update your existing heating system in order to e.g. change the location of the radiator, an emergency leak, or paint the wall behind the radiator, and etc, we can drain the water from the central heating system. For this we need to stock up on drain hose and locate a valve to drain the water from the central heating. It can usually be found near the radiator or boiler at the lowest level of your house or flat. Place the hose on the tip of the outlet valve and then place the other end out in the garden or in the drain so that it is not higher than the drain valve from the central heating. Turn off the boiler’s power, in case you have an open heating system, shut off the water to the tank which is usually located in the loft of your house. Then, gently unscrew the valve using an adjustable wrench, if the valve is old and does not unscrew then you have to call in a plumber (Emergency Plumber Romford can do this for you). After that, unscrew the radiator bleeding valve at the highest level of your house. This should be done on a cold radiator as a warm one can burn you. After draining the water and performing the planned work, you have to refill water the heating system and inhibitor to the appropriate pressure, check for leaks, bleed central heating system and switch on the boiler. This can be dangerous if done by an unskilled plumber as it can result in flooding of the house and damaging the body of the central heating system. Therefore, the work must be performed by a qualified plumber. Romford Emergency Plumber will do this work for you, quickly and safely.

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.