Some top tips for bleeding radiators

IF your radiators are hot at the bottom and cold at the top, this usually means there's trapped air inside, which stops them from filling with water and working properly.

The bleed valve is usually at the top of the radiator and the shape of the hole will determine what you use to bleed it - a radiator key or a screwdriver.

Before you open the valve, cover the floor underneath to protect it because water can spurt out and it can be dirty.

Only bleed your radiators when the central heating is turned off and the radiators have cooled down, otherwise you could get scalded and more air could get into the system.

To bleed a radiator, insert the radiator key or screwdriver into the bleed valve and turn slowly to open it. You'll hear a hissing sound, which is the air being expelled, but this can quickly become water.

If there's a lot of trapped air inside and it's taking a long time to bleed, stay nearby so you can keep an eye on it. Once water starts coming out, close the valve, clean up and move on to the next radiator.