Water heater anode rod change frequency
I understand that you are suppose to change your WH anode rod every year under normal circumstances. I learned that lesson the hard way. Ever since, I've put nothing but softened water into my tan...
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I would use the new anode and check it in a year. I assume all of them are made of a good "sacrificial" metal to keep the water heater tank from developing corrosion holes due to galvanic action. At least, I would hope so.
