30 gallon, natural gas water heater, 35,500 btu, with blanket 2" insulation, for installations from sea level to10,100, .63 energy factor, recovery at a 90 rise-gallons/ hours 36, first hour rating 64, draft diverter outlet size 3" with integrated adapter for 4" vent option, t & p valve, glass lined tank, aluminum anode rod, polymer lined heat trap nipples, pex dip tube, next generation fvir approved, stainless steel flame arrestor for replacement air intake surrounds the entire base of heater, door mounted manual reset temperature cut off, not for use in mobile /manufactured homes, will void warranty, have self powered honeywell millivolt generator gas control valve, unit dimensions 61-3/4"h x 16"d, 6 year tank & parts warranty, meets new naeca 2015 efficiency standards, shipped with factory insulation blanket.