GEN 2 (ASME) Opti-Therm 125 gall/500 MBH/NG Fully modulating, 135 MBH to 500 MBH condensing water heater Lifetime cathodic protection system, NO sacrificial anodes, PVC/CPVC Power Vent or Power Direct vent, 5-yr tank warranty. #55665-2 | B2B Storefront