Farm Innovators Bird Bath De-Icer, 500 Watts, Cast Aluminum Utility De-Icer. Top quality to keep your bird bath ice free this winter. This de-icer is heavy duty. It will keep a small pond from freezing over completely. The unit turns on automatically when the water temperature gets down to 35 degrees and turns off when the water goes above 45 degrees so the water won't overheat. Cord is 5 feet long.