We looked into the Rinnai Continuum and thought that it was a great system. Endless hot water, multiple venting options and a reasonable price. In the end we did not go with one as our contractor was not familiar with them and we did not have the time to bring in an outside contractor so we went with a standard tank system. If for some reason mine ever had to come out this would be my choice. RD Plumbing in Laconia does Rinnai and could probably help.
The plumbing side of it would be quite easy, its one pipe in and one out plus a propane hookup and a vent.
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