50 Gallon, Short, Natural Gas Water Heater, 40,000 BTUs, 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, Water Connection Location Is On The Top Of The Water Heater, Water Connection Size: 3/4", Vent 3" Or 4", UEF: 0.62, Unit Dimensions: 49-3/4"H x 24"D, 6 Year Limited Tank & Parts Warranty.