I'm interested in this little experiment also.
While by no means perfect: the house that we just moved in came with a cheepie 6-yr warranty A.O.Smith water tank (natural gas of course, thus the interest in this subject) that may have a few more years left (inner glass lined tank has a bit of rust water coming out even though I flush/drain from the bottom petcock every several weeks)...and I'm actively shopping for a better deal (still into storage hot water tank units as I don't want to do any cosmetic "damage" to the house by running PVC-based hoses for high-efficiency/condensing venting methods), not wife approved..
Budget is a concern at this moment but granted: I can find something that doesn't cost more than double (compared to typical 6-yr warranty heater tank), or close to an additional 60% to that of a standard 10yr warranty tank, then I'm all for it.
Q.
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