Although there are various types of Livestock Water Tank De-Icer-e.g., floating, submerged, drain plug-attached, sidewall-mounted, convertible floating-to-submerge-all have the same function, all are electric powered, and all are thermostatically controlled with automatic shut-offs. Some types are available in different models, based on wattage (from 250 up to 1,500), to accommodate varying tank sizes and temperature zones.