Constructed of patented cast aluminum for ultimate efficiency and safety, this deicer is designed to keep a small hole open in the ice to remove harmful gasses. Safe for use in all ponds of 50 to 600 gallons with rubber and plastic liners, it has a 3 year warranty. Works great even in subzero temperatures. Thermostatically controlled to operated only when necessary. 10' power cord. 7" Dia x 3" H.