Lochinvar® Copper-Fin II® Gas Water Heater, High Efficiency, Series: CFN, Natural Gas, 1260000 Btu/hr Input, 2-1/2 in NPT Water, Hot Surface Ignition, Aire-Lock Direct Vent, 12 in Vent, Ultra Low Nox: No, 33-1/2 in W x 58-1/2 in D x 36 in H, Commercial/Residential/Dual: Commercial