Off Grid Ammo Box DIY Heater Build
https://rethinksurvival.com/off-grid-ammo-box-diy-heater-build/
Well this is an interesting idea, transforming an ammo box, mason jar (not necessary), some copper coil, and a few odds and ends into a DIY heater using the principles of thermal siphoning. After some trial and error he got the portable heater to work great! ---CONTINUED---
VIDEO: https://www.youtube.com/watch?v=zwqPiZ4Wgys