Matt Coston wrote:I posted the below comment on another thread about a week go:
The prevailing advice is: don't use metal in the burn tube and riser. It will function for a while, but eventually corrode.
https://permies.com/t/40/52544/metal-burn-tunnel-heat-riser
Admittedly, your video didn't show (or give any details on) the internal riser.
EDIT: This is the thread I referred to - https://permies.com/t/82837/rocket-stove-video-weld-easy