Noritz® Tankless Water Heater, 120000 Btu/hr Heating, Liquid Propane/Natural Gas, 1/2 in Gas Connection, Direct Electronic Ignition, Condensing/Non Condensing: Condensing, 0.5 to 6.6 gpm, 0.89 (NG)/0.89 (LP), Ultra Low NOx: No, Indoor/Outdoor: Indoor, 27.2 in H x 18.3 in W x 9.4 in D, Commercial/Residential/Dual: Residential