Noritz® Tankless Water Heater, Mid Efficiency, Series: NR501, 120000 Btu/hr Heating, Natural Gas Fuel, 1/2 in Gas Connection, Direct Electronic Ignition, 0.5 to 5 gpm Flow Rate, 0.81, Copper Heating Element, Wall-Hung Mounting, 3/4 in Water Connection, 15 to 150 psi Pressure, 115 to 140 deg F, No Ultra Low NOx, Outdoor Indoor/Outdoor, Beige, 20.5 in H x 13.8 in W x 6.7 in D Dimensions, Residential