Life skills

Bleeding radiators is an easy but essential maintenance task that everyone should learn how to do. Here, a Wickes expert explains the basics

A radiator that is cooler at the top than the bottom needs to be bled, as it means trapped air is preventing water from circulating and so heating the radiator properly. But even without a problem, it’s a job that’s worth doing annually. All you’ll need is a radiator key (available at Wickes if you don’t already have one), a small bowl and some old towels or cloths.

First, switch off your central heating and hot water at the boiler and wait until your radiators are fully cool – this is important as otherwise steam and boiling water may escape when the valve is released.

Use the old towels to protect the area around the radiator. Once it’s cool, locate the release valve – it will be at the top end of the radiator and resemble a small, square pin. A double radiator will have a valve on each side and you will need to bleed both; some radiators can also have a valve on the back panel. Holding the bowl beneath, place the radiator key into the valve and slowly twist it, about a quarter turn, anticlockwise. Any trapped air will hiss as it’s released. Once water begins to come out or you hear a gurgling sound, close the valve by turning it clockwise (don’t over-tighten). If nothing comes out, the radiator is fine and you can close the valve.

Repeat the process on all other radiators (start on the ground floor and work up), then check the pressure gauge on your boiler. If it has dropped below its normal level, you’ll need to top up the water via the filling loop – your manufacturer’s instructions will explain how but, if you’re unsure, seek professional advice. If your pressure is normal, turn the heating back on. If any cold spots remain or come back quickly, you may have an underlying problem in your heating system and should get it checked by a professional.