This floating deicer is designed to keep a vent hold in pond of ice with 50-600 gallons. Thermostatically-controlled, 1,250-watt deicer operates automatically during freezing temperatures. Safe for all ponds – plastic, liner, or concrete. Elements encased in aluminum for durability, safety, and efficiency. Measures 7" diameter x 3-1/2" high. Cord is 9-1/2" long. CSA approved. Three-year warranty.