There are several synonyms for the term "infrared heater," including radiant heater, quartz heater, and space heater. Radiant heaters utilize infrared radiation to provide warmth, while quartz heaters use quartz bulbs to produce heat. Space heaters, on the other hand, are general terms used to describe any portable heater that is designed to heat a space. Infrared heaters have gained popularity due to their energy efficiency and ability to directly heat objects in their line of sight, rather than heating the air in a room. Whatever the synonym used, the basic function of these heaters remains the same; to provide warmth and comfort during cold days and nights.