AO Smith® Cyclone® Xi™ Gas Water Heater, Series: BTXL-100, 100000 Btu/hr Heating, Natural Gas, 1/2 in NPT Gas Connection, 75 gal Tank, Power Direct Vent, 129 gph at 90 deg F Recovery, 96% Energy Efficient, 1 in NPT Water Connection, 150 psi, 181 deg F, Tall, Yes Ultra Low NOx, 27-3/4 in W x 65-1/4 in H