Wood stove "Iron Dog I" .... who knows it?

What you are looking for is probably called "Bullerjan". In my opinion, it looks cool, blasts an incredibly large amount of warm air into the room very quickly. I once experienced it at a customer's hunting lodge - I would have liked to have had it too; but didn't get permission from the boss ;).

I also like that one, but it is WAY too big. (13 kW in one of the models we mean) If it runs at a reasonable temperature, we'll have to open the windows ;) The boss won't go for that.

I didn’t find the Kratki MBM 11 precisely, but they were all around 1500?

1,270€ incl. shipping ;)

That more heat accumulates in chamotte stoves also means that more of it goes out the chimney, because it’s open to there.

No. They are just as open as any wood stove.

Where does the heat go? That is – for me – a question worth discussing without getting a verifiable answer.

There isn’t much to discuss. Pure cast iron stove = chimney and directly into the room. Stove with storage mass = chimney, room, and storage mass (which then releases heat again). An individual fireplace can also additionally generate warm air – for that there are ventilation openings in the cladding or warm air channels at the fireplace insert.

And during this time heat continuously rushes out the chimney. The faster the transfer into the room, the less can disappear through the chimney.

That’s not correct. You fuel the fireplace differently. Without storage, much more disappears through the chimney.

Cast iron, for example, is faster than chamotte. Temperature differences are thus released faster into the room from a cast iron stove,

Negligible concerning how much heat a cast iron stove absorbs.

What you are looking for is probably called "Bullerjan". Looks cool to me, blasts a huge amount of warm air into the room very quickly.

Warm air fireplace! Has nothing to do with cozy fire. But extremely effective.

Where does the heat go? This is – for me – a question that one can discuss well without getting a verifiable answer. Undoubtedly, a large part goes out the chimney. A material that absorbs heat quickly also gives it off quickly. Cast iron, for example, is faster than fireclay. Temperature differences are therefore released into the room faster by a cast iron stove than by one with fireclay. The fireclay stove holds heat longer and thus distributes the release over a longer period. And during this time, heat continuously flows out to the chimney.

I think that’s where your error in thinking lies. The fireclay stone stores the heat and still gives it off to the room even when no fire has been burning for a long time. Then nothing goes out the chimney anymore; that only happens when the fire is burning. At least, that was the case with us, that the stones were still somewhat warm the next morning. And accordingly, they were still releasing heat. Moreover, stone is a better heat store than metal anyway.

No. They are just as open as any wood stove.

Both are equally open, exactly. While one releases the heat "immediately" into the living space, the other retains the heat longer INSIDE the fire chamber. From there, more naturally escapes outside in the same time. ... but I think we don't need to argue about that :) everyone gets the stove they deserve ;)

In search of IronDog users, I registered on several forums where I hoped to find someone. In one of these forums, a dealer just posted the following:

(I hope I am not violating any rules with the quote and hereby thank the author, whose name I will not mention)

an ERFA is a stove

1. The lining of the combustion chamber with cast iron plates, fireclay bricks, or vermiculite panels has no effect on the emission values of the ERFA. Any chimney inspection institute will confirm this to you.
2. The lining of the combustion chamber with these materials is not done to achieve heat storage. The lining is only done to protect the combustion chamber. If the ERFA is made of steel or cast iron, the combustion chamber must be protected against excessive temperatures. To prevent damage to the body of the ERFA.
Only in masonry tiled stoves are fireclay bricks used for heat storage. However, these are very thick fireclay bricks up to 15 cm thick.
In a wood stove or fireplace insert, fireclay bricks of this thickness are not used. Mostly between 15-30 mm thick.
3. Any manufacturer of an ERFA and any testing institute will confirm this to you.
4. For centuries ERFA manufacturers have used cast iron or fireclay bricks for this purpose. In the last 25 years more and more vermiculite panels have been used. Vermiculite does not store heat at all.

Whether the author has sound knowledge or not, I cannot judge, but that is my impression. It is interesting for me.

Elsewhere, the same author said that cast iron linings are no longer used because they last too long and no spare parts need to be purchased.