We was going through a water heater every 2 years before.
It has paid for itself already.
We drain ours every year, glad to have a drain in the basement.
i have ro di set up, i dont really like it
have a carbon filter, and a few coconut shell or w/e filters varying microns
i installed pex a few years ago, practically brainless to work with it
Water good with it?
Have you ever sent it in to sample or test yourself?