Features 1-inch insulation R Value 8.00 EF Rating .58 draft diverter outlet size 3-inch with integrated adapter for 4-inch vent option factory-installed T & P valve stainless-steel flame arrestor air intake surrounds the entire base of the water heater door-mounted manual reset. Has a 6-year limited tank and parts warranty; 1-year labor warranty. The tank is glass-lined with anode rod that protects against corrosion. Sediment-reducing PEX dip tube. Piezo igniter allows for easy "one-hand" pilot ignition without matches. Not approved for use in mobile homes.[]