50 Gallon, Tall, Natural Gas Water Heater, 40,000 Max BTU's, 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: 48, First Hour Rating: 81 Gallons, Self Cleaning Tank, Water Connection Is Located At The Top Of The Water Heater, Water Connection Size: 3/4", Vent Size: 3" Or 4", UEF: 0.64/ EF: 0.60, Unit Dimensions: 60-3/4"H x 21"D, 6 Year Limited Tank & Parts Warranty.