The Lochinvar & A.O. Smith 100327113 Thermostat is a temperature control component designed for compatible commercial boilers and water heating equipment. It monitors system temperature and regulates heating operation by activating or interrupting the heating circuit when preset temperature levels are reached. This helps maintain consistent water or system temperatures while supportin... https://www.partshnc.com/100327113-lochinvar-ao-smith-thermostat