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Question:
What is infrared heater?
Answer:

An infrared heater is a body with a higher temperature which transfers energy to a body with a lower temperature through electromagnetic radiation. Depending on the temperature of the emitting body, the wavelength of the infrared radiation ranges from 780 nm to 1 mm. The relationship between temperature and wavelength is expressed by the Wien's displacement law. No contact or medium between the two bodies is needed for the energy transfer. Infrared heaters can be operated in vacuum or atmosphere.[1]

One classification of infrared heaters is by the wavelength bands of infrared emission.

  • Short wave or near infrared for the range from 780 nm to 1,400 nm, these emitters are also named bright because still some visible light is emitted;
  • Medium infrared for the range between 1,400 nm and 3,000 nm;
  • Far infrared or dark emitters for everything above 3,000 nm.
Question:
What is far infrared?
Answer:
This heating technology is used in some expensive infrared saunas. It is also found in space heaters. These heaters use low watt density ceramic emitters (usually fairly big panels) which emit long wave infrared radiation. Because the heating elements are at a relatively low temperature, far-infrared heaters do not give emissions and smell from dust, dirt, formaldehyde, toxic fumes from paint-coating, etc. This has made this type of space heating very popular among people with severe allergies and multiple chemical sensitivity in Europe. Because far infrared technology does not heat the air of the room directly, it is important to maximize the exposure of available surfaces which then re-emit the warmth to provide an even all round ambient warmth.