Thanks a lot. I have no access to cast refractory now. What do you think of using 7"x9" .25" thick steel for fire box and 6" diam. .25" thick pipe for heat riser insulating them both with perlite?
Michail take a look at this fireplace insert and imagine there is a rocket stove instead. The enclosed space above fireplace is build up to the ceiling, from where the heat is distributed to the rooms on the second floor. If you make it out of rocks or cob, that would create your mass. If you want to add oven in that space, you can too. Did you get it?
Michail, are you 2 rooms above the kitchen? If yes why not to collect your heat in the box build above the rocket heater in the kitchen and than let it flow to the rooms through the openings in the floor.
Thanks for temperature update.
If you put oven box on top, the temperature might be too high for baking. My wife bakes bread at 400F. So I would just say find the right spot where the temperature will be good for your baking needs, and place the box there.
I wonder if I could cut an opening in the front of the body of the stove near the top and weld in an oven box out of some 14 ga steel and put a door on the front or would this make the air flow not work very well insode?
What about if you make an oven box near the top on the outside , like 12" x 8" x 6" size . It should give enough heat to bake, your measured temperature near top was around 400 F right?
