Automatic ON/OFF control with a set point range of 10 to 30degC. Mounts directly onto a wall or conduit box. Designed for GAS boilers, circulation pumps, relays, and Zone valves in heating, cooling, or heating/cooling installations. Features a dual diaphragm sensing element for close temperature control, easy-to-wire terminals with built-in conductor clamps, and mounting screws. Includes a heat anticipator for precise temperature management in systems with high heating ramp rates. Operating temperature range is 0 to 40° C. Offers change-over contact switching for cooling loads.