40 Gallon, Natural Gas Water Heater, 50,000 BTUs, High Recovery Power Vent, Electronic Gas Control Valve, Sidewall Venting Up To 80', Vents Using Inexpensive Schedule 40 PVC, CPVC, Or ABS Pipe, More Powerful Modular Blower With 110/120V Electrical System, Factory Installed 7' Power Cord, Advanced Intelli Vent Gas Control Valve, Glass Lined Tank With Heavy Duty Anode Rod Protects Against Corrosion, Non CFC Foam Insulation, Eco Friendly Green Choice Gas Burner That Reduces Nox Emissions By 33%, Factory Installed Pex Polymer Lined Heat Trap Nipples, Factory Installed Temperature & Pressure Relief Valve, Water Connection Is Located At The Top Of The Water Heater, Water Connection Size: 3/4", Vent Size: 2", 3" Or 4", First Hour Rating Is 83 Gallons, Unit Dimensions: 70 1/4"H x 20"D, UEF: 0.70/ EF: 0.70, 6 Year Limited Tank & Parts Warranty.