The Professional Classic with Demand Response high-efficiency electric water heaters are designed for long life and can be connected to utility demand response programs for energy savings. The heaters have a .92 – .93 UEF and come with dual 4500 and 5500-watt copper heating elements. Depending on the model, the heaters can provide an FHR of 51-72 gallons and recovery rates of 17 to 21 gallons per hour at a 90°F rise.