NTI Indirect Water Heater, Series: S Series, 268 MBtu/hr Heating, 79 gal Tank, 15 gpm, 3/4 in Water Connection, 314 gal at 140 deg F Recovery, 150 psi, 190 deg F Tank/210 deg F Boiler, Ultra Low Nox: No, 444 Stainless Steel, 23-7/8 in Dia x 70-1/4 in H