Patio Pond Deicer Thermostatically Controlled Designed to keep an area open to release harmful gasses. Constructed of patented Cast Aluminum for ultimate efficiency and safety. Thermostatically controlled to operate only when necessary. For use in small ponds and water garden containers up to 50 gallons. The 500 watt heater operates automatically. For Use in Ponds 50 Gallons Fish and Plant Friendly Industry Standard 10' Supply Cord In Stock-Ships Fast FIP500 85045015004