40 Gallon, Tall, Natural Gas Water Heater, 35,500 Max BTUs, 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, Environmentally Friendly Non CFC Foam Insulation, Factory Installed Pex Polymer Lined Heat Trap Nipples, Factory Installed Temperature & Pressure Relief Valve, Rated Storage Volume: 38, First Hour Rating: 65 Gallons, Water Connection Is Located At The Top Of The Tank, Water Connection Size: 3/4", Vent Size: 3" Or 4", Self Cleaning Tank, UEF: 0.61, EF: 0.62, Unit Dimensions: 62"H x 20"D, 6 Year Limited Tank & Parts Warranty.