Someone on rec.puzzles speculated that it's a home electricity/heat 
generating system based on a practical Sterling engine.

This fits many of the tidbits from the article:

- $2000 seems reasonable
- It would change city infrastructure, since electric lines wouldn't be 
necessary.
- It might violate existing residential regulations, thus requiring 
permission to install one.

Less exciting, but probably a more realistic guess that others we've come up 
with.

Joshua

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