This 500-Watt de-icer effectively prevents water from freezing in winter temperatures as low as 10°s Fahrenheit, keeping water fresh and flowing for use in poultry waterers, bird baths, livestock watering, and various other 5 to 50 gal. containers designed for home or farm use. It features an automatic thermostat controller that turns the unit on when the ambient temperature falls below 35°F (2°C) and automatically disconnects power when the sensor detects temperatures approaching 77°F (25°C) for energy savings. Constructed from premium quality cast aluminum with an anti-rust coating, it resists rusting and helps keep water clean, and is safe for use in plastic, structural foam, and metal tanks. It includes an upgraded power cord made of cold and heat resistant material for stable operation in cold weather, with a recommendation to use a GFCI outlet or an extension cord marked with the suffix 'W' (e.g. SJTW cords) for optimal safety. Setup is quick and easy for immediate use, but it is crucial not to plug the unit in without it being submerged in water to prevent damage. Important safety note: this de-icer must only be used at temperatures above 20°F, as use in extreme cold below this point carries risks such as wires hardening or becoming brittle, which may cause short circuits.