Quote:
Originally Posted by makitso
2021 Four Winds. Went to change out the plastic plug in my water heater and noticed the original appears to be larger than the brass 1/2 one I was going to put in. The original takes a 7/8 wrench, seems large to me. Am I jumping to conclusions?
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There is a very good reason NOT to use a brass plug - galvanic corrosion. Aluminum is highly reactive metal especially in the presence of warm mineralized water. Adding any copper item in contact with aluminum will cause corrosion, so it best to stick with plastic unless you want to replace the aluminum tank in a couple years.
For the chemist around copper has an electric potential of +0.34 volts and aluminum of -1.67 volts. A nice way to make a 2 volt wet cell.
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