The API W500 is a sturdy, Teflon coated aluminum de-icer. Features multiple thermostats for optimal control and energy efficiency. The low-profile, finned design provides a large surface area to run cooler while putting out the same amount of heat as conventional de-icers resulting in less mineral build-up and longer life. Specially designed for automatic drinkers, suitable for plastic containers up to 70 gallons. 
Specifications:
500 Watts, 120 Volts, 6 foot cord, Over-temperature protection and one-year manufacturer warranty. LOCKNDRY compatible.