40 gallon, natural gas water heater, 40,000 btu's, 2" insulation, for installations from sea level to 10,100', .62 energy factor, recovery at a 90 rise-gallons/ hours 4338, first hour rating 70, pex polymer lined heat traps, pex dip tube, glass lined tank, dual mag anode rods, draft diverter outlet size 3" with integrated adapter for 4" vent option, factory installed t & p valve, fvir approved, stainless steel flame arrestor, air intake entire base of heater, door mounted manual reset tco , unit dimensions 62"h x 20"d, 12 year tank & parts warranty, not for use in mobile/manufactured homes, have self powered honeywell millivolt generator gas control valve, meets new naeca 2015 efficiency standards.