This Lochinvar Thermocouple is a safety device used in heating systems. It functions by measuring the temperature of a particular area within the system. The thermocouple operates on the principle of thermoelectric effect, generating a voltage proportional to the temperature difference between its two junctions. This voltage is then used to control the operation of the system, ensuring that it functions within safe temperature limits. The Lochinvar Thermocouple is made from high-quality materials for durability and reliability, and it's designed for easy installation and maintenance. It's compatible with various models of Lochinvar water heaters and boilers, making it a versatile component in heating systems.