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I would not pursue things further. Just “Google” pictures of what the inside of most water heaters look like after a few years. As my kids say, “Don’t go there”.
That’s one reason why it is recommend not to drink or cook from the hot water tap. Lots of minerals, but obviously sterile. Most water heaters, marine or domestic, only last several years.
All in all, if your tank is old, I would just consider replacing it. Or let it go kaput in the middle of nowhere.
SM #240 Aletes
I'm afraid I probably understated the condition of the zinc and heating element. Here's a pic. I also got a better look inside the tank today, and it's pretty nasty. I have to clean it, but can't get my big paw through the hole. It's either a brush or power washer, I think. Anybody else?
On Jun 1, 2020 6:50 AM, "Gerhard Mueller via groups.io
If the zinc is OK you should do nothing more as inspection. The thin coating (film) works as a protection and will soon come back when you remove it. Only rinse the tank. That is sufficient.
Amel Sharki #60
Currently Kalamata, Greece