This piston based steam engine looks very doable and market ready for a home CHP plant: http://www.greensteamengine.com 1,500 rpm. 10 HP (~6.5 kW.e) at 125 psi steam or 4 HP at 50 psi steam. $1,995 for the commercial 2 cylinder unit without a generator. Ok needs a control system to hold Ac cycles at 50 / 60 Hz but that will not be hard to build.

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