40 gallon, lp gas water heater, 36,000 btu's, 2" insulation, for installations from sea level to 10,100', .62 efficiency factor, recovery at a 90 rise-gallons/ hours 41, first hour rating 69, draft diverter outlet size 3" with integrated adapter for 4" vent option, t & p valve, glass lined tank, aluminum anode rod, pex polymer lined heat traps, pex dip tube, fvir approved, stainless steel flame arrestor, air intake surrounds the entire base of heater, door mounted manual reset tco , unit dimensions 51 1/2"h x 22"d, 6 year tank & parts warranty, not for use in mobile /manufactured homes, will void warranty, have self powered honeywell millivolt generator gas control valve, meets new naeca 2015 efficiency standards.