I just saw the video after talking with an engineer friend of mine. The temperature is what the box has to be for the chemical reaction to take place, kind of like the platinum catalyst used in wood stoves and gasoline production. That doesn't mean that it is producing huge amounts of heat for use in other processes, which would mean lower efficiency.
In fact, the heat that is produced is probably used to keep the box at the right temperature for the reaction, with the excess available for home heating needs. Since the amount of heat depends on the electrical load, though, there would be less available at night, etc., and might be too inconsistent to be a dependable source.
Bob
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