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For a room of 10 sq. m. one such heater is enough to maintain the temperature inside +18C, with an average daily temperature outside of +10C. To use it as the main heating, you need to install several such heaters at the rate of 1000 watts / hour for every 10 sq. m. area. There will be no special savings compared to a convector or oil heater, but this one is cheaper and the heat is probably more pleasant. And it works absolutely silently. To manufacture the heater, an infrared film Heat Plus Standart SPN-306-300 60 cm wide and 500 watts / sq. m and a protective heat-distributing layer E-STONE HEAT PLUS, which are used when laying heated floors, were used. The weight of the heater is 2 kg, the surface temperature is about 40-45 degrees, energy consumption is 300 watts / hour. Thanks to bitumen insulation, the electrical safety of such a heater is at a fairly high level. The energy efficiency of this IR heater is approximately equal to those made from a heating cable and ceramic tiles, but the labor costs are much less. I do not recommend using IR film with a power of less than 450 watts / sq.m, because the heater will heat too weakly. Previously, I made a 60 * 60 cm heater using the same principle, but used ceramic tiles instead of E-STONE. It consumes 120 watts / hour. At the same time, the heating temperature of the tile is quite high, you can hold your hand for no more than 1 second. We use it to dry towels, shoes, reduce humidity in the room. And this is probably the best use of such heaters). After a year of use, I think it is better to do with tiles than with E-STONE or plasterboard. Here I was forced to abandon the tiles, because it is inconvenient to attach them and such a heater will weigh too much. Infrared film emits infrared radiation, which heats the surface of the walls and furniture in the room, and these warm objects heat the air. But this is true until we cover the film with tiles or other material, then only this material heats up, and not all the objects in the room. The exception is materials that transmit infrared radiation well - glass, plastic, paper. The distance from the film to the surface of the material is of great importance, near the film it heats up much more. Do not cover the heater completely to avoid overheating the film. You can make the same heater without covering the film with anything, just stretching it over a wooden frame. I don't think it is necessary to cover one side of the heater with a heat reflector. • DIY infrared heater