Lochinvar® Residential Gas Tank Water Heater, 40000 Btu/hr Heating, Natural Gas, 1/2 in Gas Connection, 40 gal Tank, Electronic Ignition, Power Vent, 2 in, 3 in, 4 in Vent Size, 45 gph at 90 deg F Recovery, 3/4 in Water Connection, 150 psi, Yes Ultra Low NOx, Steel, 22 in Dia x 59 in H