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Anode Rod Material Magnesium (1) Burner Type NOx (3) Steel (5) Steel, NOx (1) Draft Hood Outlet/Vent Size 2 or 3 Inch (2) 3 Inch or 4 Inch (3) 3 or 4 Inch (4) Energy Saver Conformance Yes (1) Gas Connection 1/2 Inch (4) 1/2 Inch Threaded (5) Gas Type Liquid Propane (1) Natural (8) GPH Recovery 21 GPH at 90 Deg F (3) 37 GPH at 90 Deg F (1) 41 GPH at 90 Deg F (2) 43 GPH at 90 Deg F (6) Ignition Type Piezo (3) Pilot Spark (6) Inlet/Outlet Connection 3/4 Inch Threaded (12) 3/4 Inch Threaded x 3/4 Inch Threaded (1) Number of Elements 2 (3) Options Concentric Vent Kit Termination (1) Roof Jack Kit (1) Temperature and Pressure Relief Valve (3) Power Rating of Elements 4500 Watt (3) Pressure Rating 150 PSI (1) Relief Valve Details T and P Relief Valve Included (1) T and P Relief Valve Installed (6) Temperature and Pressure Relief Valve Installed (6) Tank Capacity 40 Gallon Tank Dimensions 18 Inch Diameter x 56-9/16 Inch Height (1) 20 Inch Diameter x 46-7/8 Inch Height (1) 20 Inch Diameter x 48 Inch Height (1) 20 Inch Diameter x 49-7/16 Inch Height (1) 20 Inch Diameter x 56-1/4 Inch Height (1) 20 Inch Diameter x 56-3/4 Inch Height (1) 20 Inch Diameter x 56-5/8 Inch Height (1) 20 Inch Diameter x 62-7/16 Inch Height (1) 22 Inch Diameter x 47 Inch Height (1) 22 Inch Diameter x 47-11/16 Inch Height (1) 22 Inch Diameter x 48-1/16 Inch Height (1) 22 Inch Diameter x 49-7/16 Inch Height (1) 22 Inch Diameter x 49-9/16 Inch Height (1) Tank Height Including Draft Hood 51-9/16 Inch (1) 54-1/2 Inch (1) 54-1/4 Inch (1) 57-7/8 Inch (1) 59-7/8 Inch (1) 60-1/8 Inch (1) 60-3/8 Inch (1) 63-3/8 Inch (1) Tank Inner Lining Vitraglas (1) Tank Material Engineered Enameled Vitraglas (Lining), Rolled/Welded Heavy Gauge Steel (1) Engineered Enameled Vitraglas (Lining), Steel (Surface) (10) Steel Surface (1) Tank Warranty 6 or 10 Year Limited (3) 6 Year Limited (10) Thermostat Type Fully Automatic, Fast Acting, Surface Mount (3) Type Fan Assist (1) Non-Simultaneous, Upright (3) Short (3) Tall (2) Vertical, Jacketed (1) Venting Type Atmospheric (7) Direct, Power, Horizontal/Vertical (1) Power (1)