Wood stove with a rotary or sliding door? Smoke/ash problem

yes i just don't understand how a storage stone above the stove (so at the flue / exhaust gases) is supposed to prevent the stove from delivering its full power of 10 KW through the glass? Most of it escapes through the glass, doesn't it? How does the storage stone have a big impact on the glass, that's already after it (if you consider the path of the hot exhaust gases). Or do the exhaust gases with storage stones not release the direct heat, but rather into the storage stone and that then reduces the power, right?

Unfortunately, I also don't know exactly how it works but it works very well
Sure, a lot comes through the glass but I have the feeling that a part is then "stored away" ....
otherwise I would consider the stove useless because I wouldn't turn it on if I then have a sauna ...

It is quite simple. One kilo of dry beech wood has about 4kW of energy. How much heat enters the room from it and in what time depends on clean combustion and the stove principle. Steel stoves like, for example, the Haase Sendai 165 as in the apartment of our older son release heat very quickly into the room. With relatively little firewood, it gets warm very quickly. After a few hours, the stove is cool again. The heating output over a period (I think it is 2 hours) is given as the nominal power. Here 6.5 kW. The stove is great for romantic fire and robust heat.
The masonry stove in our house section can be fed with 13kg of wood and has a nominal power of „only“ 4kW. The energy of the fire and the flue gases is stored in over a ton of fireclay and released only slowly. The glass door is a factor for direct heat but executed extremely. The energy largely goes into the storage mass. Once heated, the stove remains fairly evenly warm for up to 24 hours and heats living, sleeping, dining, relaxing, and cooking areas on 2 levels in an extremely pleasant way.