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Heating film

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Heating film

Heating films are a method of electric resistance heating, providing relatively low temperatures (compared to many conventional heating systems) over large areas. Heating films can be directly installed to provide underfloor heating, wall radiant heating and ceiling radiant heating.

The films can also be used in heating panels to produce wall or ceiling panel heaters.

Although heating films do not usually run at very high temperatures (typically 30 °C (86 °F) on floors and up to 40 °C (104 °F) on walls), due to the large surface area they cover, they can provide significant energy output. Also due to the low temperature, undesirable heat losses can be lower, when compared to higher temperature wet heating systems with losses from long pipe runs from the central heating source.

Electric resistance heating films consist of a substrate film, most commonly made from plastic, printed or coated with a resistance material and electric contact busbars. This is laminated or coated with another layer of insulating film, usually similar to the substrate.

Electrical contacts can be made using various types of crimp contacts, which make contact through the covering films to the internal busbars. If the operating voltage is high enough, the contacts must be additionally insulated and additional safety insulation or safety earth covering must be provided over the film to protect users from shock, in case of damage to the installed film.

Heating films can be used as a replacement for conventional heating systems, as a primary heat source or used to augment existing systems.

Due to the simplicity of installation and ease of hiding the installation, it can be popular with DIY installers. The films can be placed or removed when needed, when installed under carpets of other easily removable floor covering. Heating controllers can allow the residents to select which surface will be heated.

Films are available with different power outputs per m2. The required power output will depend on the area covered, building insulation, required energy input to the room and maximum desired surface temperature. Many countries have regulations for the maximum floor or wall temperature. Thermostats with surface temperature sensors may be required in these jurisdictions.

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