Just wanted to show you our latest creation under testing. It is a portable type of “rocket-stove” or “zimmovar sobase” that we call it in Azeri. It burns fairly effecient. It dosent have a bench connected yet, only about 5 meters of horisontal pipe working as convectors. It is not enough to take out all the heat from the smoke, but i guess it is down to about 70 celcius. The system is a 4″ system. It has a heat riser  ratio of 1 to 3. It is insulated with sawdust-clay and has some thermal mass. Total weight more than 50 kg.  It burns about 7 kilos of wood through a 12 hour burn. It heats a fairly poor insulated kitchen with high sealing (about 75 kubik meters of air). I have an electric heater doing the same job pulling 2,5 kw. For being the first prototype we are quite happy with its performance, it still need some changes in design, but overall very happy!! The best thing is the stove price 50-70 manat ! It will pay back its cost easely in one winter! For the market in Azerbaijan we think it is important to come up with this portable model since many people live on limited space and like to move their stove in the warmer seasons. We still do expect to build more mass heaters in the mountains.