Opti-Therm 100 gall/299,999 MBH/NG Fully modulating, 76 MBH to 299,999 MBH condensing water heater Lifetime cathodic protection system, NO sacrificial anodes, PVC/CPVC Power Vent or Power Direct vent, 5-yr tank warranty Non-ASME tank # 55747 | B2B Storefront