I rebuilded the firebox four times, and there is some critical things to consider. The airgap in the back of the burn chamber should be thin enough to shoot the air as a laminar flow along the back edge of the chamber for secondary burn of the gases up in the tube. (Thanks to both Alex Chernov and Ekonomka for learning more about that) Thats why it doesnt work as well having the exit at the front or middle position over the chamber. This setup showed in the movie works ok, but I think it will work better if I make the chamber deaper and have the wood laying dow keaping the airgap in the back clear through the whole burn. The burn dosent nead a lot of air to maintain combustion. Ratio 1/3 or 1/4  compared to firebox exit seams ok including gaps around door.

Cleaning it is also an issue. The best way seams to be knocking on the barrel now and then and vacuming at the flue exit. But probably once a year it is good to take out the rocks and clean it throughly. That means that constructing it with a removeable lid seams  necessary.

Compared to the rocket mass heater we here have a stove that dosent nead to be constructed permanently in a house. And it dosent nead a special foundation. It will work with a standard 4″ flue that they use here. It burns down the wood in one go with minimal maintainance of the fire. It burns almost as clean as the RMH? It gives a very hot cooking surface.Its total cost for a selfbuilder is about 20$!
On the down side it “only” retains heat for about 8 hours after the burn. Other negatives??

Some questions to be answered. Will it be sufficient to heat a livingroom space throught the winter in this climate? Will it give the fuel savings that we are hoping for?

I will have this construction tested through winter to heat a friends livingroom, and come back with some reports on its performance.

If you ever do this construction yourself, I would love to hear about your experience with it.

Tha advantage by constructing it like this is that the user can move away both the flue and the stove in the warm season, and by that have only a nice bench left.

The whole setup costs about 100 dollars, and will make a huge difference in wood consumption. Initial testing shows that consumption can be redused with 70% compared to the local stove. That means payback time for the investment can happen within one winter!! Additionally, considering hiring a plumbing service to ensure optimal efficiency and maintenance could further enhance the savings and longevity of the plumbing system.

A lot of locals have been resistant to the thought of having a big bench that cant be moved in their house. Ofcourse this is a new concept to them, they are used to instant radiant heat, not the kind of heat you get by conduction sitting on a heated bench. Our hope is that by trying it, more people will be convinced of the comfort it gives them.

I will post some pictures later, with some construction detail.