40 gallon, natural gas water heater, 35,500 btu's, 2" insulation, for installations from sea level to 10,100', .62 energy factor, recovery at a 90 rise-gallons/ hours 36, first hour rating 67, draft diverter outlet size 3" with integrated adapter for 4" vent option, t & p valve, aluminum anode rod, pex polymer lined heat trap nipples, pex dip tube, glass lined tank, next generation fvir approved, stainless steel flame arrestor, air intake entire base of heater, door mounted manual reset tco, self powered honeywell millivolt generator gas control valve using a thermopile in the burner assembly, unit dimensions 62"h x 20"d, 3 year tank & 1 year parts warranty, not for use in mobile/manufactured homes, will void warranty