Farm Innovators Model P-500 Premium Cast Aluminum Submergible Pond De-Icer, 500-Watt

This thermostatically controlled de-icer maintains a vent hole in the ice to allow harmful gasses to escape. Constructed of patented cast aluminum for ultimate efficiency and safety. This fish and plant-friendly heater is for use in ponds up to 50 gallons and is safe in all patio ponds. One year limited warranty.