Radiant heaters, as opposed to warm air systems, such as a forced air unit heaters, delivers the source of heat to the floor level, not the ceiling. Radiant energy is the oldest form of heating used to provide comfort and is the basis for all heating systems. 
Radiant energy is very pure radiation and is absorbed by an object without physical contact with the heat source or by heating the surrounding air, as is the case with convective, forced air systems. Radiant heaters are the most efficient and effective method in which to deliver "heat" under the diverse conditions present in warehouses, garages, storerooms as well as the largest facilities imaginable.
Radiant heaters are electric heaters that generate heat using infrared waves. Radiant heaters are a good solution for people looking for an immediate heat source, as opposed to warm air heaters, which have a relatively long lag time between activation and the area reaching the desired temperature.
Some heating systems work by first heating up a large space of air, which in turn heats up the structure itself, as well as objects and people within the space. The air takes a while to become warm enough to convey the heat directly to people in the room, depending on the size of the space to be filled, the insulation of the structure, and the temperature setting of the heater. These types of heater can work well over a longer period or if the air in an entire building must be heated.
The floor is typically the largest mass within any building. Thus, the floor becomes the primary source of heat. When the goal is more immediate heat, however, and an individual person is using the heater, radiant heaters are often the preferable solution. Radiant heaters send out infrared radiation – similar to how our sun transfers its energy to the earth – which is not absorbed by the air as it passes through it. When these infrared waves strike an object, some of the heat is reflected, but the bulk is immediately absorbed. This means that a person sitting in front of an infrared radiant heater will feel the heat virtually from the moment the heater is turned on.
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