Hot water tank, has anode isolated to enamelled container, where change of anode current is determined based on comparison of anode current with absolute upper threshold value, absolute lower threshold value and/or relative threshold value

摘要

The tank has an anode (2) isolated to an enamelled container (3), and a measuring value detecting and evaluation unit for detect and store an initial value of the anode current during initial operation of the hot water tank. The measuring value detecting and evaluation unit compares the detected anode current with an absolute upper threshold value, an absolute lower threshold value and/or a relative threshold value. A change of the detected anode current is determined over the time based on the comparison.