40 Gallon, Tall, Natural Gas Water Heater, 40,000 BTU, Ultra Low Nox Emissions, Electronic Gas Control Valve That Provides Precise Temperature Control & Operational Status, Piezo Igniter Allows For Easy 1Hand 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, Not For Use In Inside Closets Where A Direct Vent Design Is Required, 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: 83 Gallons, UEF: 0.64, Unit Dimensions: 62"H x 18"D, Complies With Ultra-Low Nox Requirements In California Of Less Than 10 NG/J Nox Emissions, 9 Year Limited Tank & Parts Warranty, 1 Year Labor Warranty.