How To Bleed A Radiator

How To Bleed A Radiator

If your radiators develop cold spots this is a sign that you have air in the system, this means the efficiency of your radiators will be reduced which in turn will increase your heating bill.  Its a relatively easy job to bleed a radiator your self. I have listed the steps involved below.

You will need a radiator key or a flat head screw driver, a bucket or washing up bowl and some old cloths or towels that you don’t mind getting dirty.

How To Bleed A Radiator Step by Step

Step 1 – Turn your heating on

Turn your radiators on full and turn your heating system on, this will help to build up the pressure in system and identify where the trapped air is.

Step 2 – Identify where air is trapped

Run your hands over the entire surface of the radiator (be careful it could be hot!). If the radiator has cold spots (usually near the top of the radiator) then it probably needs bleeding.

Sept 3 – Turn off your central heating

Once you have identified which radiators need bleeding turn of your central heating. Leave it to cool for at least a couple of hours otherwise any water that comes out will be scolding hot.

Bleed The Radiators

At one end of your radiator there is a valve place your radiator key in the square part in the centre. Place a bowl under the valve and then using a cloth to grip the key slowly open the valve in a anticlockwise direction.

You should hear a hissing sound as air leaves the radiator, hold the key in the same position until the noise of gas escaping stops and water starts to come out. Then close the valve but be careful not to over tighten it as it can result in damage to the valve.

Now you should look at the pressure gauge on your boiler, if the pressure is low you will need to replenish the water. The manufacturer will provide instructions about the optimum amount of water to add to the system.

Now check your radiators again, turn your heating back on and run your hands over the radiators. The cold spots should have gone, its also worth checking that the valves are closed so you dont get any leaks.

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