Reznor NG 75K BTU Input, 43.6K BTU Output, Pwr Vented, Unit Heater, 83% AFUE with 4 inch" Vent, 1/2"Gas Connection, 115 Volts, MOCP-15A, Dims (WxDxH) 27"Wx31.91"Dx16.75"H, 76-lbs, Field convertable to sep. comb. with options SC1 and CC2 or CC6