In scientific terms, infrared heat is a form of electromagnetic radiation that transfers thermal energy directly to objects, surfaces, and materials rather than heating the surrounding air. This method of heat transfer, known as radiant heating, delivers fast, efficient, and targeted heat.

Infrared radiation lies on the electromagnetic spectrum between visible light and microwaves. For industrial heating applications, infrared wavelengths typically range from 0.78 to 1,000 μm. Different wavelength ranges are selected based on the material being heated, the required heating speed, and the specific process or application.