Over 10 or more period you’re water Heater can fill up will mostly calcium sludge or slag and you only getting about 20 gallons of water out of 40 gallon tank. This why the recommend draining some every year? Which causes lost of hot water quickly and you heater kicking on reheating the water and the slag.
Some try replacing the antidote after few years which Reduces the buildup but can’t eliminate it. Water softener can reduce this by removing the metals before it enters the water heater. Eventually it going to go bad Depending on where you live and metal in the water.
When I lived in okie land I alway brought the heaters with 12 year warranty, they would rust out and leak. I always got another one free. They don't last long there.
The new instant gas heaters attached to outside of the house may solve this problem? But, they are new and see it problems develop over the years?
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