50 Gallon, Tall, Natural Gas Water Heater, 40,000 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", First Hour Rating: 81 Gallons, Vent Size: 3" Or 4", Rated Storage Volume: 48, First Hour Rating: 81Gallons, Unit Dimensions: 60 3/4"H x 21"D, UEF: 0.62, EF: 0.60, 9 Year Limited Tank & Parts Warranty, 1 Year Labor Warranty.