Perhaps there would be a market, despite unit efficiency.
I think I said the same thing at the end of week last week.
It all will depend on total cost over life of a unit, that takes into account the same measures for units of competing functionality as measured with install costs (wiring or piping gas/exhaust), lifespan, maintenance costs, costs to operate per water volume times volume used over time, cost of unit, etc.
That is all one very big unknown at this point.
But, it is certain the laws of how energy operates, whether when carried by electricity, or transformed to heat in water, is what it is - there will never be any surprises about those numbers. Laws are what they are, and new discovery that replaces prior laws, such as was caused by Einstein, does not happen by replacing with contradiction of the old, but by replacing by refinement the embraces and includes results of the old under a new, enlarged or improved framework of understanding. Did Einstein's gravity work overthrow Newton's, in a sense yes, but it shows how Newton's is correct as a special case simplification of what is now understood.
If the Wanderport waterheater is going to exist, it will require significantly more electic power supply than one would get from a household plug-in. Nothing will change that. It will require dedicated higher amperage wiring, just as does a resistance instead of microwave based electric tankless electric heating unit. It might have marginally better conversion of electricity to heat in water, might, but if so only because it takes a while for the resistance elements to cool off after the water flow is stopped and the elements are shut off, and that if depends on whether the heat loss in transforming to kilovolt to run the microwave magnetrons is captured into the water (by the watercooled magnetrons) and they have less residual heat after they are powered down.
There will not be any great earth-shattering efficiency improvement.
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