Electric water heater having balanced wattage density water heating

摘要

An electric water heater (10) has a tank portion (12) in which water (14) to be heated is stored. The stored water is heated by a vertically spaced plurality of electric heating elements (26, 28) extending into the tank interior. The heating elements (26, 28) are of unequal wattages, and serve unequal volume water zones (Z1, Z2) but provide equal heating wattage densities in each of the water zones.