Rinnai® Non-Condensing Tankless Gas Water Heater, Model: REP160I, 160000 Btu/hr BTU, 91 W Power, 0.26 to 6.6 gpm Flow Rate, Standby Loss: 1 W, 0.81 % Efficiency, Vent Size: 3 in, 5 in, Vent Type: Concentric, 4 A, 120 V, 60 Hz, NPT Connection, 150 psi Pressure, Energy Star Compliant: No, Wall Mount, Natural Gas Fuel, Ignition System: Electronic Direct, On/Off, Galvanized Steel, Sliver, Lead-Free/Contains Lead: Lead-Free, 120 to 140 deg F, 27.3 in H x 14.05 in W x 11.2 in D, Altitude: Up to 10200 ft, 3/4 in NPT Gas Supply, 3/4 in NPT Cold Water Inlet, 3/4 in NPT Hot Water Outlet, 55 dB Sound Level