40 Gallon, Tall, Natural Gas Water Heater, 40,000 BTU, Low Nox Emissions, Electronic Gas Control Valve That Provides Precise Temperature Control & Operational Status, Pex Dip Tube Helps Maintain Efficiency, Glass Lined Tank With Heavy Duty Anode Rod Protects Against Corrosion, Piezo Igniter Allows For Easy 1 Hand Pilot Ignition Without Matches, 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", Rated Storage Volume: 38, First Hour Rating: 80 Gallons, Unit Dimensions: 62"H x 20"D, UEF: 0.66, EF: 0.62, 9 Year Limited Tank & Parts Warranty, 1 Year Labor Warranty.