Reznor UEZ NG 310K BTU Input, 277.55K BTU Output, Sep Comb, Unit Heater, 91% AFUE with 4 inch" Vent, 3/4"Gas Connection, 120 Volts, MOCP-20A, Dims (WxDxH) 41"Wx48.66"Dx34.125"H, 395-lbs, 2 Approximate Condensate Per Hour (Gallons)