so what if instead, I build the 20-gallon pocket rocket inside a 55-gallon drum filled with sand. And then submerse the whole thing in a 400-gallon tank? Would that slow things down enough to get the results I'm looking for?
Location: Southern alps, on the French side of the french /italian border 5000ft elevation
Sand is insulative, but also a heat sink. Do you necessary need to heat from the top?
Couldn't a 55 gal barrel be welded in a cutout in the bottom of your 400gal tank. And used as the barrel on a normal J tube rocket? Or even a batch rocket? That's not for bathing? Make the exhaust from the previously described barrel coul in the 400 gal tank too! Be sure do stay with a shortish pipe! like may be 20ft for a 8 incher J! You will have condensation problems. But that can be dealt with.
The reason I was wanting to feed from the top is that I was going to have a welder friend of mine build a funnel that could be loaded for auto-feeding. I live on the edge of the woods, so there is more deadfall out there than I could ever hope to burn. All looks like free heat and free hot water to me
I love the concept of an outside wood boiler, but those suckers are **expensive**. So I was hoping I might get the heat i want without emptying the bank account to do that. (hence, build my own). I was sorta borrowing the idea from a snorkel stove