Porcelain-lined, steel water heater feature an anode rod to Absorb the electrolytic action, ensuring that your entire water heater system lasts longer. With the fastest recovery in the industry, six and ten gallon water heaters give you more hot water and fewer cool water cycles. Copolymer insulation jackets specially fit the tank to retain heat better than the Cardboard style used on other brands. For higher recovery, use the gas and electric water heaters which use a 1,440 watt element to recover an additional 6 gallons per hour. Easy to install, operate and maintain. Access doors are sold separately. 1 per box.