Foiled polyethylene foam is made of polyethylene and aluminum foil. It has a high reflecting capacity therefore it is mainly used as a warmer behind the heating unit.
It is also used for heat and sound proof of water systems, refrigerators, air condition systems, ventilation ducts and warm floor installations. Due to its small thickness this foam can replace many ordinary heaters. The foiled polyethylene foam 10 mm thick is three times as warm as the brickwork 54 cm thick. Thanks to the aluminum layer it reflects 97% of thermal emissions returning them to the inside of the building. If such a warmer is attached behind the heater unit, it saves up till 30% of heat.