If it were me, I'd buy a quality standing water heater. I have a State Industries unit that was installed in 1992. It's still going strong (40 gallon, gas). They aren't one of those companies that use cheap components (like crappy dip tubes).
I'd stay away from tankless for now. Way too inconsistent as far as reliable hot water and require yearly maintenance.
Our engineering group received a white paper from a company that has developed a tankless system that will rock the world. It will be pricey, for sure.
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