The Resideo TH114-A-240D-B Line Voltage Manual Thermostat is a control device designed to regulate electric heating systems. It operates by sensing room temperature and manually switching the electrical circuit to maintain the desired heat level. Commonly used with baseboard heaters, convectors, and radiant heating systems, it provides reliable temperature control. Its simple manual design ensures ease of operation, enhances energy efficiency, and supports consistent indoor comfort, making it a dependable solution for effective electric heat management.