Professional Classic™ electric water heaters are engineered for longer life – resistored heating elements and premium grade anode rod Efficiency .90 - .93 UEF Isolated tank design reduces conductive heat loss Resistored copper upper element and resistored Lifeguard™ stainless steel lower element to prolong anode rod and tank lifePerformance FHR: 45 - 67 gallons, based on gallon capacityRecovery: 21 GPH at a 90° F riseSystem Sentinel (Available on selected models) Exclusive diagnostic system with glowing LEDs that verify heating element operation. LEDs pin point the exact location of functioning or non-functioning heating elementsLonger Life Premium grade anode rod provides long-lasting tank protectionFeatures Electric junction box located above heating elements for easy installation Over-temperature protector cuts off power in excess temperature situations Automatic thermostat keeps water at desired temperaturePlus… EverKleen(r) self cleaning device fights harmful sediment build-up with a high-velocity spiraling water stream – helps operating efficiency by saving energy, money and improving tank life Enhanced-flow brass drain valve Temperature and pressure relief valve included Low lead compliant