Ultra low NOx natural gas water heater. 1 In. insulation. For installations from sea level to 7,700 Ft., 0.63 Energy Factor. Unit dimensions: 61-3/4 In. height x 16 In. diameter. Draft diverter outlet size: 3 In. with integrated adapter for 4 In. vent option. T & P relief valve, glass lined tank, KA-90 anode rod, PEX polymer lined heat trap nipples. PEX dip tube, Next Generation FVIR Approved, stainless steel flame arrestor. Air intake entire base of heater, door mounted manual reset temperature cut off. Self powered Honeywell Millivolt Generator Gas Control Valve. 6 year tank & parts warranty. Not for use in mobile/manufactured homes. Meets new NAECA 2015 Efficiency Standards.