bought this intent to use on my shark system but temps always stayed in check due to lower level location in house, has been tested wih a 75gallon tank with hot temp starting at 116F and less than a hr (53min to be exact)down to 77F which was what it was programmed to be at. has 3/4' hook ups, 21"tall including barbed fittings on top by 10"width by 16.5" depth and is 1/5th horsepower and comes with original owners manual "asking 200 OBO"