Rinnai® Ultra Condensing Tankless Gas Water Heater, Series: RUCS Series, Model: RUCS75i, 160000 Btu/hr, 89 W, 0.26 to 7.5 gpm, 0.9 Energy Factor, 1.3 W Standby Loss, 3 in, 4 in Vent Size, Concentric Vent, 2.30 A, 120 V, 60 Hz, NPT Connection Type, 150 psi, Yes Energy Star Compliant, Wall Mount, Natural Gas, Electronic Direct Ignition, On/Off Switching Action, Galvanized Steel, Sliver, Lead-Free/Contains Lead: Lead-Free, 120 to 140 deg F, 31.1 in H x 18.3 in W x 10.1 in D, Up to 5400 ft Altitude, Additional Information: 3/4 in NPT Gas Supply, 3/4 in NPT Cold Water Inlet, 3/4 in NPT Hot Water Outlet, 1/2 in NPT Condensate Drain, 47 dB Sound Level, 31.1 in H x 18.5 in W x 10.1 in D