Features: Energy Star qualified with uniform energy factor of .92 Equipped with Rinnai Circ-Logic™ - pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation (not included) Save time with hot water whenever and wherever you need it, any size home, even for simultaneous uses at multiple fixtures Save energy and reduce utility costs by operating only when hot water is needed Temperature lock function prevents accidental or unauthorized changes to water temperature Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx emission levels Wi-Fi ready with optional Rinnai Control-R wireless module (not included) Residential warranty: Limited 15-year or 12,000 hrs. on heat exchanger, 5-year on parts, 1-year on labor (5-year optional on labor). Commercial Warranty: Limited 8-year or 12,000 hrs. on heat exchanger, 5-year on parts, 1-year on labor (2-year optional on labor) Professional installation required; call 84-GO-Rinnai for assistance Safety Features: Flame failure - flame rod Boiling protection Combustion fan RPM check Over current - glass fuse Remaining flame (OHS) Automatic frost protection Specifications: Width: 14-3/4" Height: 33-7/8" Depth: 22-1/16" Product Weight: 71 lbs. Fuel Type: Natural Gas Gas Connection: 3/4" Water Connection: 3/4" Water Pressure (Min): 50 Water Pressure (Max): 150 Temperature (Min): 98 Temperature (Max): 140 Natural Gas Pressure (Min): 3.5 WC Natural Gas Pressure (Max): 10.5 WC Voltage: 120v Frequency: 60 Amperage: 4