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Do you need to dismantle a radiator? It will then be necessary to drain it first. Follow our tips.

Drain a radiator

Drain a radiator

How to drain a radiator

Do you want to dismantle your radiator to do some decoration work? It will be necessary to drain it first to evacuate the water contained in the pipes. The radiator normally contains a drain cock, located down. Place a container under this tap and open it to let the water out. Then turn off the tap.

To drain all your heating circuit, you can do this starting with the radiator that is at the lowest level of your home. But the simplest solution is to go through the boiler drain valve, if you have one. In this case, close all radiators, slowly open the tap and collect the water in a container. Be aware that the water can be very dirty. Let the water flow. Depending on the size of your container, you may need to empty it during the operation. In this case, do not forget to close the tap.

In some cases, it is possible to disassemble a radiator without draining it.

Drain or purge the radiator?

If you have a radiator that is not working well, or noises in the piping, you can simply purge the radiator. This is to evacuate the air that is in the circuit. To do this, open the bleed screw or bleeder to allow air to escape. When the water begins to flow, you can close the trap. Do step by step without forgetting to turn off the boiler accelerator before working on the radiators! After the purge, we must not forget also to restore the necessary pressure.

Be careful, purging and draining the radiator are two different things. You can purge your radiator (evacuate the air) by manipulating the trap which is at the top of the radiator. As for the emptying (evacuation of water), it is possible by intervening on the drain cock, or the water return valve, which is at the bottom of the radiator.


Video Instruction: How to Drain a Central Heating Radiator - Remove a Central Heating Radiator