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Enormous sized, combined cycle steam can near 50% efficiency, as in modern electric powerplants. However, on a small scale, I'd be surprised to see better than 10%. People have tried for years. The results are always the same, and for very good thermodynamic reasons. The temperature that superheated steam requires demands massive energy input. To extract that energy down to a condensate (efficient recovery of all energy input) has always demanded large, non portable equipment. (for all that expansion).
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