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Re:Large-scale ‘sand battery’ goes online in Finland by KennyBlanken on Thursday July 07, 2022 @01:52AM (#32010385)
Water heater failure is also easy to avoid by annual or seasonal flushing of any accumulated sediment and checking the anode. As long as the anode is replaced, the water heater should be fine.

I would expect a large condo association's maintenance staff to be able to handle this sort of thing very easily.

Re:Large-scale ‘sand battery’ goes online in Finland by com2kid on Thursday July 07, 2022 @01:54AM (#32010393)
The ceramic lining of a water heater cracks due to thermal stress over time.

Pure stainless steel water tanks don't have this flaw, but they aren't they common.

Re:Large-scale ‘sand battery’ goes online in Finland by lazide on Thursday July 07, 2022 @10:19AM (#32014443)
That is what the anode is there for, to be the sacrificial corroding element.

Depends a lot on how corrosive/nasty the water is in an area though. Some are just nuts.