. I built the all steel rocket stove
from iwilltry. My wife would not let me use it in the house, so now it lays out in the yard. I have read that the steel chimney inside will not stand up to long
term high temperatures. So I was looking for a way to make it last longer if that was the case. Moldable ceramic wrap would kill two birds with one stone.
You could wrap your steel pipe, let it harden and if the steel tube deteriorates who cares. Because what is left is your thermal ceramic chimney. It does not seem to be that expensiveness. Having $500 to 600 a month electric bills this last winter makes me want to find an alternative heat source. So I want to build an outdoor version
for heating water for a water to air heat exchanger and perhaps in a green house setting. There is one guy on youtube that built a long feed tube in which he said he gets a 6 to 7 hour burn, he also has a how to prepare the wood video.