Rinnai® Non-Condensing Tankless Gas Water Heater, Model: RE180E, 180000 Btu/hr BTU, 61 W Power, 0.13 to 8.5 gpm Flow Rate, Standby Loss: 1 W, 0.82 % Efficiency, Vent Size: 2 in, Vent Type: Direct, 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, 98 to 140 deg F, 24.64 in H x 14.05 in W x 11.7 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, 54 dB Sound Level