Qmark Install it anywhere heat is needed to prevent pipes, pumps and other water, hydraulic fluid or oil-filled equipment from freezing. It is designed to provide automatic, 24-hour protection. Set the thermostat at any desired level and leave it. There are no moving parts. It is maintenance free and can be left unattended all winter long - ideal for remote locations. Steel sheath, aluminum finned element provides fast heat dissipation and a long life because of cooler sheath temperatures. Steel sheath, aluminum finned element provides fast heat dissipation and a long life because of cooler sheath temperatures. The thermostat is completely contained within the control box. Temperature control range is 40 to 70F. One model is adaptable to 120V or 240/208V supply. Shipped wired for 240/208V field conversion to 120V is quick and easy. All power supply and control wiring terminates in the tamperproof control box - no live voltage in the element area. *