Product Details Designed to rest on the bottom of a stock tank, unnoticed by livestock This economical submergible tank de-icer is designed to rest on the bottom of a stock tank, unnoticed by livestock. Its thermostatic control operates the heating element only when necessary. A sturdy, protective cage permits use in all tanks, including plastic. 1,000 and 1,500 watts of power. Submergible tank de-icer Thermostatically controlled to operate only when necessary A sturdy, protective cage permits use in all tanks, including plastic 1,000 Watts.