50 Gallon, Tall, Propane Gas Water Heater, 37,000 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", Vent Size: 3" Or 4", Nominal Capacity: 50, Rated Storage Volume: 48, First Hour Rating: 81 Gallons, Unit Dimensions: 60-3/4"H x 21"D, UEF: 0.64, EF: 0.60, 6 Year Limited Tank & Parts Warranty, 1 Year Labor Warranty.