Noritz® Tankless Water Heater, High Efficiency, Series: NRC711, 15000 to 157000 Btu/hr Heating, Natural Gas, 3/4 in Gas Connection, Direct Electronic Ignition, Condensing/Non condensing: Condensing, 0.5 to 7.1 gpm, Energy Factor: 0.89, Copper/Stainless Steel Heating Element, Wall Hung Mount, 3/4 in Water Connection, 15 to 150 psi, 115 to 140 deg F, Ultra Low Nox: No, Indoor/Outdoor: Outdoor, Beige, 23.6 in H x 13.8 in W x 6.7 in D, Commercial/Residential/Dual: Residential