I was thinking double barrel to create a rocket stove like effect rather than just a regular stove.
It appears this first like with Geoff might work really well for space & materials we have available.
Checked out the second link but unfortunately can't afford 120 for plan at the moment.
We're working on a very limited budget of 600 dollars and a time span of a month - 2 tops.
I'll check out this link and more info into hydrolic oil. Had no idea you can use it.
Would that still work with a rocket stove boiler set up?