Meet the Hubbell Endurance E, your trusted companion for reliable hot water. For decades, this commercial water heater has faithfully served countless locations and purposes. HydraStone™ cement lining and copper-silicon tappings fortify this water heater with resilience. Polyurethane foam insulation and built-in heat trap reduce heat loss and operating costs. The unsung hero, Endurance E will deliver for the long run.