40 Gallon, Tall, Natural Gas Water Heater, Max BTU's Input: 40,000, 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, Shipped From The Factory With An Insulation Blanket, Non-CFC Foam Insulation, Factory-Installed PEX Polymer Lined Heat Trap Nipples, Factory-Installed Temperature & Pressure Relief Valve, Self Cleaning Tank, Rated Storage Volume: 38, First Hour Rating: 78 Gallons, Water Connection Location Is Located At The Top Of The Tank, Water Connection Size: 3/4, Vent Size: 3 Or 4", UEF: 0.65, EF: 0.62, Unit Dimensions: 62"H x 18"D, 6 Year Limited Tank & Parts Warranty, 1 Year Labor Warranty.