This fellow built a very nice CHP system in his garage.
Note the vertical exhaust heat exchanger.
He did a very nice job of keeping the whole system compact.
The engine enclosure really lowers the noise levels.
I suspect with energy costs going the way they are, there may be renewed interest in saving heating costs by using alternate fuels in CHP systems.
Walk around...
https://www.youtube.com/watch?v=NPUyaQzEUTw (https://www.youtube.com/watch?v=NPUyaQzEUTw)
Running...
https://www.youtube.com/watch?v=FPTgtWz6rv0 (https://www.youtube.com/watch?v=FPTgtWz6rv0)