Reznor UEZ NG 180K BTU Input, 159.25K BTU Output, Sep Comb, Unit Heater, 91% AFUE with 4 inch" Vent, 1/2"Gas Connection, 120 Volts, MOCP-15A, Dims (WxDxH) 39.187"Wx46.03"Dx20.125"H, 245-lbs, 1 Approximate Condensate Per Hour (Gallons)