Noritz® Tankless Water Heater, High Efficiency, Series: NRC98, 16000 to 180000 Btu/hr Heating, Natural Gas, 3/4 in Gas Connection, Direct Electronic Ignition, Direct Vent, 3 in, 4 in Vent, Condensing/Non condensing: Condensing, 0.5 to 9.8 gpm, Energy Factor: 0.9, Copper/Stainless Steel Heating Element, Wall Hung Mount, 3/4 in Water Connection, 15 to 150 psi, 100 to 140 deg F, Ultra Low Nox: No, Indoor/Outdoor: Indoor, Beige, 24.2 in H x 18.3 in W x 9.4 in D, Commercial/Residential/Dual: Residential