I came across this recently and thought it may be of some intrest to members, they are selling units for $1500 USD
2 cylinder, 10 hp engines
Each engine weighs about 25 lbs.; dimensions, with the drive shaft, are 21”L x 8”H x 13”W. Materials are brass, aluminum and stainless steel to prevent corrosion. The engine may be installed in any position and uses approximately 22 cubic inches of steam per revolution. It yields about 10 hp from 100 psi of steam at 300 rpm’s. Optimal operating range is from 200 to 600 rpm and 60 to 150 psi.
For the full 10 hp from this engine, we recommend using a boiler in the range of 2.5 to 5 boiler horsepower capable of producing 100 psi to power this engine. Lower pressures may be used for applications requiring less horsepower. Speed is controlled by a simple ball valve.