Ice Eater P250HP: 1/4Volts/Amps* 115V / 2.5AOpen Diameter*: 20-25 ft.Cord Length: 25 ft.All units available in 230V, (half the amps, i.e., 2.5 @ 115V = 1.25 @ 230V).* 200 Ft. available in 230V only* Based on an average winter - extreme conditions will cause open diameter to become smaller.When water freezes, it expands, becoming lighter. This fact is the principle upon which Ice Eater functions. Ice Eater circulates warmer bottom water to the top, thereby preventing ice formation. If surface ice already exists, the flow of warmer bottom water will effectively melt it. Ice Eater obtains its superior operating efficiency through the use of an axial flow, shrouded propeller design. This design also provides protection for the rotating propeller.