why do you assume it is going out? i have had water heaters last much longer. my tankless is 0ver 20 years old
Everywhere I read says the typical life of a hot water tank is 15 years, so I was going off that.
But honestly my tap water isn't too bad. Not a whole lot of mineral buildup on any of the other plumbing I've touched.
Might just let it be for another 5 years and then reassess.