Condensing Tankless Water Heater; Type Residential, Gas, Outdoor; Inlet/Outlet Connection 3/4 Inch Male Threaded x 3/4 Inch Male Threaded; Gas Type Natural; Relief Valve Details Pressure Relief Valve Supplied; Venting Type Power; Electrical Input Supply Rating 120 Volt AC at 60 Hertz, 2 Amp, 64 Watt; Gas Input Supply Rating 12000 to 199900 BTU/Hour; Temperature Rating 100 to 180 Deg F; Tank Dimensions 13.8 Inch Width x 9.4 Inch Depth x 23.6 Inch Height; Tank Material Polyester Coated Steel; Tank Capacity 0.2 Gallon; Efficiency Rating Thermal; Ignition Type Direct Electronic; Options Quick Connect Cord; Inclusions/Features Flame Sensor, Freeze Protection, Lighting Protection Device, Overheat Prevention Device, Temperature Lockout, High Elevation Adjustment, Digital Remote, Self-Diagnostic Onboard Computer System, Back-Up Battery Compatible, Recirculation Compatible; Applicable Standard CSA, NSF, UPC, SCAQMD RULE 1146.2; Lead-Free; Energy Factor 0.84; Gas Inlet Size 3/4 Inch; Flow Rate 0.5 to 9.8 GPM; Thermal Efficiency 84 Percent; Pressure Rating 15 to 150 PSI