The difference between high-intensity and low-intensity infrared heaters lies in their mode of operation.
In a high-intensity system, thousands of tiny flames pass through a perforated refractory surface, blanketing the surface of the emitter and producing temperatures of up to 1,800 degrees Fahrenheit.High-intensity heaters emit energy at a higher amplitude and temperature than low-intensity heaters and typically operate unvented.
In a low-intensity heating system, a flame is ignited within an exchanger, producing hot exhaust gases which travel through the tubing and reach temperatures of up to 1,350 degrees Fahrenheit, emitting infrared energy. Low-intensity heaters are commonly direct-vented.
In both systems, heat energy is directed to the floor level via reflectors before being absorbed by people and objects in its path.