Tankless Water Heater, Condensing, Ultra Low Nox Version, Mid-Efficiency, Residential Gas, Indoor Direct Vent Vent, BTUH Capacity: 11000 to 160000 BTUH, Electronic Ignition, Fuel Type: Natural Gas Input, 4.1 to 6.0 gpm Flow Rate, 7.0 GPM Max, 85 to 140 Deg F Operating Temp., 0.26/0.40 gpm Min. Flow/Activation, 94% Energy Efficiency, 0.82 Energy Factor, Back To Back Showers: Infinite, Number Of Bathrooms: 2-3, 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, Warranty: 12 Year Limited Residential Warranty - 5 Years Limited Commercial Warranty, 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