Stove for a bomb shelter

I need to build a bomb shelter stove from scrap materials. At first, I wanted a simple one, but then decided on an additional afterburner. The firebox will have a removable lid; if you remove it, you can install a cooking pot. I'm also considering loading it with firewood, but then I won't be able to install a fire damper.

Bogdan,

I would recommend mixing some local clay soil with straw and try to use it to line your firebox and the afterburner - 5 cm thick layer would be good for the firebox. For the afterburner I would increase the straw to clay ratio  and could make it thinner. You will extend the life of the steel shell and will gain some thermal mass.

Cristobal Cristo wrote:Bogdan,

I would recommend mixing some local clay soil with straw and try to use it to line your firebox and the afterburner - 5 cm thick layer would be good for the firebox. For the afterburner I would increase the straw to clay ratio  and could make it thinner. You will extend the life of the steel shell and will gain some thermal mass.

Thanks for the advice. The firebox is 8 cm thick, so I don't think it will burn through, but it's 32.5 cm in diameter. Can I line the outside with clay? I wanted to make a protective screen out of a metal barrel to allow hot air convection between it and the firebox wall. I could fill that space with clay. But right now, the goal is to quickly heat the room. If I need to conserve heat, I can make a loop from the chimney along the floor and make a mass. What is an afterburner?

Cristobal Cristo wrote:Bogdan,

I would recommend mixing some local clay soil with straw and try to use it to line your firebox and the afterburner - 5 cm thick layer would be good for the firebox. For the afterburner I would increase the straw to clay ratio  and could make it thinner. You will extend the life of the steel shell and will gain some thermal mass.

Thanks, I figured out why it's necessary to insulate the firebox and afterburner.