"Not yet" ! More like "Not ever". Go back and look at WDRP PRs, back around and in the year after the single cavity device was supposedly completed but then abandoned in favor of the nulti-cavity design. Those PRs were clearly setting up for the eventual admission that they would be able, at best, to license the "heat engine" for use but would not be able to bring out a total-cost-of-ownership successful or competitive consumer household water heater, whether point-of-use or whole-house.
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