The Allied Precision Industries double thermostat de-icer features a high-tech heater with a microprocessor to accurately measure and control water temperature, resulting in substantial energy savings over conventional de-icers. Converts from a floating to a sinking de-icer by simply removing cover and float. U.S.A. Cord Length (ft.): 15 Uses a microprocessor to accurately measure and control water temperature to save energy Keeps water temperature more constant over a period of time Avoids large temperature swings that are harmful to fish Converts from a floating to a sinking de-icer Solid finned aluminum heating element runs cooler than other de-icers and will not harm plastic pool liners Heater safely shuts off within seconds if heating element is exposed to air Die-cast heating element is virtually indestructible