Thermal detectors are used where a significant amount of heat can be released in the initial stages of a fire, for example, in warehouses of fuels and lubricants, or where the use of any other detectors is impossible. The use of such detectors in administrative and household premises is prohibited.

In the event of a fire, the field of the highest temperature is located at a distance of 10… 23 cm from the ceiling, therefore, the heat-sensitive elements of the detector are usually located in this area. The heat detector, located under the ceiling at a height of six meters above the fire, is triggered when a fire generates 420 kW of heat, and at a height of 10 meters — at 1.46 MW