Lochinvar® Residential Gas Tank Water Heater, Energy Saver, 40000 Btu/hr Heating, Natural, 1/2 in Gas Connection, 40 gal Tank, Electronic Ignition, 3 in, 4 in, 38 gph at 90 deg F Recovery, 0.62 Energy Efficient, 3/4 in Water Connection, 150 psi, Tall, Ultra Low Nox: Yes, Steel, 20 in Dia x 61-3/4 in H