Cathodic corrosion and dry fire protection apparatus and methods for electric water heaters
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United States of America Patent
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Nov 17, 2020
Grant Date -
Feb 22, 2018
app pub date -
Oct 30, 2017
filing date -
Jun 24, 2013
priority date (Note) -
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Abstract
The metal tank portion of an electric water heater is protected against corrosion utilizing a corrosion protection system that detects a voltage potential between the sheath portion of a tank water-immersed electric heating element and the tank. In one embodiment of the corrosion protection system the sensed sheath/tank potential is utilized to enable a user of the water heater to accurately gauge the necessity of replacing a sacrificial anode extending into the tank. In another corrosion protection system, the sensed sheath/tank potential is utilized to provide impressed current cathodic protection of the tank and also to prevent dry firing of the electric water heater.
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