Lochinvar® Tankless Water Heater, High Efficiency, Series: LTI, 120000 Btu/hr Heating, Natural Gas Fuel, 1/2 NPT Gas Connection, Direct/Power Vent, 3 in, 4 in Vent, Condensing Condensing/Non Condensing, 6.6 gpm Flow Rate, 0.91, 3/4 in NPT Water Connection, 150 psi Pressure, Yes Ultra Low NOx, Indoor Indoor/Outdoor, 13-7/8 in W x 10-13/16 in D x 22-7/8 in H, Residential