I have no experience with using a RMH but I've boiled plenty of syrup. If you're boiling down more than a gallon or so of sap, you probably don't want to do it inside. The steam is sticky and whoever has to clean the walls and ceiling may not like you for a while.
I make a Maple Syrup instructional movie! Check it out HERE SKIP books, get 'em while they're hot!!! Skills to Inherit Property See me in a movie building a massive wood staircase:Low Tech Lab Movie
It has been done with a rmh , but not a small batch. Those folks were full on syrup making.
If you search there will be a post about it.
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
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dragontechrmh.com Once you go brick you will never go back!
On top of spaghetti all covered in cheese, there was this tiny ad: