I actually love steam engines, and a Bane Marie is something every galley
So lets see for a 15 hp steam engine that makes 517 pounds of steam per hour, you would need five S.F. per boiler HP, so only 75 S.F of boiler heat exchanger
surface area. Throw in a feed water tank and pump and a bit O piping and your in business.
Though a 15 HP steam engine will use up about a 20# propane
cylinder per hour of full speed operation. Which is one of the reasons, steam went out of fashion rather quickly after the internal combustion engine came about.
Hum... I could design a solar
powered steam engine. Would it be practical. Not so much.
Boy I can just not stay on topic.