Open water during winter is unusual, and it will encourage a wide variety of birds to drink from an ice-free bird bath. This de-icer features a built-in thermostat. Even on the coldest days, it will keep drinking water within the optimal drinking range for wild birds. A stainless steel guard is provided to shield wildlife from contacting the heating element. The rear-exit power cord and neutral-color plastic housing make for a low profile in the bird bath. 3 year warranty. 200 watts, 120 volts