Lochinvar® Gas Water Heater, Multi-Flue Charger, Series: CGN, 199999 Btu/hr Heating, Natural Gas, 1/2 in Gas Connection, 100 gal Tank, Spark Ignition, 6 in Vent Size, 193 gph at 100 deg F Rise Recovery, 80 % Energy Efficient, 2 in Water Connection, 150 psi, 180 deg F, Tall or Short: Short , Ultra Low NOx: No, ASME Yes/No: No, Glass Lined Steel, 30-1/4 in Dia x 72 in H