Rheem PROE50 2 RH91 Professional Classic Standard Tall Residential Electric Water Heater, 50-Gallon Efficiency: .85 - .93 EF, Isolated tank design reduces conductive heat loss, Over-temperature protector cuts off power in excess temperature situations Automatic thermostat keeps water at desired temperature Electric junction box located above heating elements for easy installation Performance: FHR: 42 - 99 gallons, based on gallon capacity