The Voltex AL (anit-leak) features a high Uniform Energy Factor (UEF) of 4.02 with the 66-gallon unit and 3.8 with the 50-gallon unit. New anti-leak features provide added peace of mind. The unit offers iCOMM Smart Connectivity, vacation mode and a smart anode that adapts to local water conditions to protect and extend the water heater's life. This model also has backup electric heating elements that help the water heater recover quickly during periods of high demand, the company says.