CE-20-AS American Standard 20 Gallon Point of Use Electric Water Heater Heavy Gauge Steel Tank.Inner Tank Glass-Lined - with Dura-Glas and fired at 1600 degrees F for optimum protection from the effects of corrosion.Non-CFC Energy-Saving Foam Insulation - reduces energy cost by maximizing heat retention.Anode Rod - to ensure longer tank life.Immersion Heating Element - applies heat directly to water.Fully Adjustable Thermostat Control - for variable temperature control to 160 degrees F.Factory Installed Energy Cut-off System.Top and Side Water Connections - on 6-20 Gallon Models affording choice of cold-in and hot-out connections.Factory Installed Temperature and Pressure Relief ValveDrain Valve Factory Installed - on all models for easy draining of tank.AMERICAN STANDARD Point-Of-Use Electric Water Heaters - are certified at 300 PSI test pressure and 150 PSI working pressure and all tanks are 100 percent hydrostatically tested at the factory.UL Listed.Commercial and Residential Limited Warranties - Commercial applications come with a 3 year limited warranty on inner glass-lined tank & 1 year limited warranty on all other component parts. Residential applications come with 6 year limited warranty on inner glass-lined tank and 6 year limited warranty on all other component parts.