Radiator Heat Reflector Foil This is another great energy saving product from Irish company Exitex. Designed to be fit all radiators this foil reflects heat created from radiators back into the room instead of the heat generated being lost through the wall. Each pack comes on a 5 metre roll which measures 0.5 meters in length. Each pack includes 24 double sided sticky pads to allow you to easily install the foil behind your radiators. How to Install Radiator Heat Reflector Foil Installing the reflector foil is a simple DIY prdegreesess as you are not required to remove radiators from the walls in order to do this.