Always a Popular one this time of year as we turn the heating back on. Already we are getting lots of calls for advice on this.

If your radiator has some hot spots and some cold spots, you probably need to bleed it. Bleeding radiators means removing the air from them.

  • Open both valves at the bottom of the radiator.
  • On the top left or right of the radiator will be an air vent which can be opened using a bleed key (purchase from hardware store) or some may need a small screwdriver
  • Hold an old rag underneath the vent and be careful to protect decorated surfaces from potential water spray
  • Slowly open the vent – you will hear a hissing sound (air venting) which will change to a steady stream of water.
  • When you get this far you can retighten the air vent.
  • Note- in sectional radiators (e.g. aluminium) air-pockets can form throughout the radiator so a longer bleed is required to remove all air pockets. The first flow of water may not signal the last of the air.
  • To prevent constant bleeding ask your plumber to fill your radiators with an inhibitor fluid such as Fernox. This fluid will help protect your system and reduce air pockets forming