I have a 600' well. I've replaced mine a couple of times over the decades - electric.
You can test on the elements. Should be 12 or better, anything 10 or below should be replaced. They say the top element is the one that usually kicks on/off and does the majority of supplying hot water. Your sacrifiicial anode may be gone, if your water is that bad. I never had to replace mine, but replaced the elements and thermostats - they are inexpensive.
Mine 50 gallon is easily accessible and parts are inexpensive though.
Why two and why are they in a crawl space? How much work to move them for easier access? One day they may go bad and you aren't healthy enough to repair them....Any type filters to treat the water?
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