This is by no means an actual recommendation, and I have no idea if it would meet any building codes (though I don't see why it wouldn't). I'm just thinking aloud of what might work.
The biggest problem with tankless water heaters in an area like mine (S. Ontario Canada) is that the incoming cold water pipe is COLD, year-round. Probably 10 degrees Celsius year round here, and perhaps even colder for some people in some seasons.
This creates a problem for tankless water heaters that have to heat water another 40 degrees Celsius on an ongoing basis.
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