De-ice your stock tanks with this efficient tank sinking de-icer. The tank heater operates at the bottom of the tank so it's less likely to be disturbed by livestock. The stainless steel heating element is controlled by a thermostat and has an automatic shut-off to prevent overheating. The 1500-watt heater comes with a galvanized wire guard for safe use in plastic tanks. For use with 100-300 gallons (378.5 to 1,135 litres) of water.