Hi Logic, yes you're right about the condenser in general.
The little high speed flash steam engine was intended for use in a boat as a very small outboard motor, which already has a huge supply for water, but needs to be compact and relatively uncomplicated.
For a larger engine used for CHP in the home, a condenser would be the way to go.
I do have a full sized twin Westinghouse type steam engine which would have been used for electrical generation. I haven't rebuilt it yet. The big problem (and startup expense) for all steam engines is the boiler. There are lots of Mickey Mouse (and dangerous, or short-lived) amateur boilers on YouTube. I'm not interested in taking chances that way, so a boiler is not available yet for me.
If you or anyone else wants to see a fascinating series on a steam powered automotive workshop please look up on Youtube David Richards Steam Powered Workshop. I suggest starting at the beginning. I love doing machine work and metal casting, so a machine shop run on steam is truly fabulous to me.
I smoke the trout that I catch on wood. I have some videos up on fishing and an ultralight row boat I built some years ago. My channel is called srhacksaw.
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