|Heat sensors are can be used in areas where smoke or fumes may be a common occurrence such as the kitchen or in a garage. They will sense, instead of smoke, how hot an area gets. They detect major climbs in temperature and will set off an alarm when a certain degree of heat is detected.
The most common types have 135 and 194 degree limits. Some places require more of a heat tolerance, such as an attic, so therefore the varying degree types .