Place heat-resistant radiator reflectors between exterior walls and the radiators

Some people recommend buying radiator foil, or simply using ordinary kitchen foil with the shiny side facing towards the back of the radiator. However, reflectors made from kitchen foil will soon become inefficient, as aluminium oxidates very quickly and then loses its reflective quality.

There are only two radiator reflectors approved for use in the UK Government's Carbon Emission Reduction target (CERT) Scheme administered by Ofgem (the UK Regulator of energy companies)– Radflek and Heatkeeper (also called Novitherm). Independent testing of Radflek for the CERT Scheme has shown that Radflek is 23% more efficient than Heatkeeper/Novitherm. All third party test data for Radflek is disclosed on its website (http://www.radflek.com) unlike its competitors.