We just installed a new water heater. The old one was 11 years old. It was not leaking and worked fine, but the present rebate from TECO for a new one is $350. We do not have a water softener, and almost nobody I know has one. We use the water filter in our refrigerator for drinking water, and it tastes fine.
Here is what our new water-heater manual (State brand) says about water softeners: "Artificially softened water is exceedingly corrosive....The use of a water softener may decrease the life of the water heater tank." For what it is worth. You decide. I am no plumber, but I presume the water heater manufacturer knows more than I do.
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