Quote:
Originally Posted by LJAZ
No the RV water heaters aren't glass lined, or lined at all. I'd guess that a glass lining wouldn't stand up to all the bouncing around while towing. So the sacrificial anode keeps the metal tank from rusting.
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But why do residential water heaters have them when they are glass lined? We flushed the water heater in our FF and in this Shasta and all that you see is white debris and not much of it. No iron rust.
Edit: researched subject. The glass eventually cracks. We should insert a new one in our RV heater.
"Most water heater tanks are steel with a thin glass lining to protect the metal from corrosion. Since the lining eventually cracks, tanks have a second line of defense against rust: a long metal “anode rod” that attracts corrosive elements in the water. When the rod itself becomes so corroded that it can no longer do its job, the tank soon rusts out, leaks and needs replacement. However, if you replace your anode rod before it fails, about every five years, you can double the life of your water heater."
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