WATER TANK HEATER WITH PREDICTIVE HEATER FAILURE FEATURE
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United States of America Patent
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Issued Date -
Apr 28, 2011
app pub date -
Oct 23, 2009
filing date -
Oct 23, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A water heating system includes a tank for holding water and a resistive heating element associated with the tank for heating water in the tank. A control is connected for monitoring at least one resistance parameter of the resistive heating element as power is applied to the resistive heating element, the control configured to output a fault signal if the monitored resistance parameter exceeds a set threshold. The monitored parameter may be one or more of (i) a rate of resistance change during heater start-up, (ii) a rate of resistance change during steady state heater operation or (iii) a heater resistance corresponding to a set point in time following heater start-up.
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