Heats the water, keeps open an ice-free area of approximately 30 ft ' in diameter down to sub-zero temperatures. Thermostatically controlled to operate only when necessary. Heavy-duty float will not rust, corrode or leak. Special 10 ft ' heating element. 6 ft heavy duty grounded wire. For use in METAL TANKS ONLY. Individually packed. 120 AC voltage, 1500 watts.