Ray Red radiant tubes transmit heat by radiation, through electromagnetic waves in the invisible infrared range. The propagation of electromagnetic waves, that carry thermal energy and that permit the transmission of heat by radiation, takes place in a direct line at the speed of light. Ray Red radiant tubes heat people and objects directly and offer immediate thermal comfort, without air movement. Ray Red radiant tubes are gas-operated appliances with which it is possible to manage the heating in the building both autonomously and individually, based on the different needs of the operational zones.