Not easy task
I did one in Colorado on a gas water heater. First you need a 1 1/16 half inch socket(not common) with a breaker bar. Then a 3 or 4 foot length of heavy pipe to leverage the breaker bar to break the rod loose. It's in a recessed covered area on the top by the in/out connections. I had to have help to stabilize the heater to break it loose. Mine was completely eaten up and I had basically a thick wire remaining. I did this at ten years so no idea when it was end of life. Then had to cut off new rod to drop into port on top as hit ceiling and it is a precise hole to insert. I DO NOT RECOMMEND. I have installed dozens of heaters and elements. If very hard water the first time you loose a lower element on electric, start saving up for a new water heater.
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