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Keeping this in consideration, do infrared heaters use a lot of electricity?
Infrared heaters heat in a different way to convection heaters. Infrared heaters work by not heating the air, but by heating the objects, people and the structure of the space. So if you're asking the question, do infrared heaters use a lot of electricity, then the answer is no.
Furthermore, are infrared heaters cheap to run?
Not only is the cost of running an infrared heater much less expensive the other heaters, but it also costs less to maintain. While electric and gas heaters generally have motors, fans and other moving parts, infrared heaters use reflective panels to put out the infrared light.
The ICNIRP statement on the biological effects of infrared radiation (IR) indicates that thermal injury (heat) is the dominant risk. Skin cancer is not expected from exposure to IR. However, increased skin temperature can reduce DNA repair efficiency, and promote skin cancer that is initiated by other agents.