How about this?
The trick seems to be using a Helium vacuum working fluid. They say no moving parts but there is a piston and displacer bouncing on a spring.
While this is NASA aerospce technology, perhaps it would scale down from nuclear to backyard solar.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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