40 Gallon, Tall, Natural Gas Water Heater, 35,500 BTU, Low Nox Emissions, Electronic Gas Control Valve That Provides Precise Temperature Control & Operational Status, Piezo Igniter Allows For Easy 1 Hand Pilot Ignition Without Matches, Pex Dip Tube, Glass Lined Tank With Anode Rod Protects Against Corrosion, Non-CFC Foam Insulation, Factory Installed Pex Polymer Lined Heat Trap Nipples, Factory Installed Temperature & Pressure Relief Valve, Self Cleaning Tank, Water Connection Is Located At The Top Of The Tank, Water Connection Size: 3/4", Vent Size: 3 Or 4 ", Nominal Capacity: 40 Gallons, Rated Storage Volume: 38, First Hour Rating: 65 Gallons, Unit Dimensions: 62"H x 20"D, UEF: 0.61, EF: 0.61, 3 Year Limited Tank & Parts Warranty, 1 Year Labor Warranty.