Tankless Water Heater, Non-Condensing, Low Nox Version, Indoor Direct Vent Vent, BTUH Capacity: 11000 to 180000 BTUH, Electronic Ignition, Natural Gas Input, 8.4 to 3 gpm Flow Rate, 85 to 140 Deg F Operating Temp., 0.26/0.40 gpm Activation, 84% Energy Efficiency, 0.82 Energy Factor, 3/4 inch Gas Connection, Water Connection: 3/4 inch Water Connection, 120VAC, 3A Power Supply, Wall Mount, Dimensions: 25-5/8 inch H x 13-7/8 inch W x 9-7/8 inch D, Includes: 10 ft Thermostat Wire, Digital Remote Control, Standards: AHRI Certified, LEED Points = 2, NSF, Energy Miser, Eco Friendly, AIA Energy Star, SCAQMD 1146.2 Compliant, CSA Certified