It is mounted through the drain hole in metal or plastic stock tanks. The electrical cord is kept out of water. The de-icer cannot be thrown from tank. It fits all stock tanks that have 3/4" drain holes. The power plug is reduced in size and does not require the cord to seperate to fit through the drain hole. It comes with a built-in thermostat. Thermostatically Controlled: Shuts Off If Water Level Becomes Too Low. 1500 watts, 120 volts. Patent Pending.