In these situations, infrared space heating can offer an efficient comfort heating option. It can be controlled in the same manner as light, reflected by mirrors and other surfaces, and blocked by solid objects. In high ceiling applications most of the heated air rises to the ceiling. When infrared heaters are mounted overhead, reflectors direct the heat energy down directly to people, machinery, and the floor. Infrared heating provides steady heat without the drafts of blowers and fans.
Infrared heaters are especially appropriate for spot heating.
A typical example is the loading dock of a warehouse. Where heated air would be dissipated throughout the warehouse space or lost out the dock doors, infrared energy is directly absorbed by the people below. Unit heaters are self contained heaters generally used in spot heating applications. These systems cover large areas and are easily expandable with the addition of pipes and burners.