A unique stove that saves 50% of wood, heats for 50 hours, built instead of an iron stove

A man built a stove for himself to heat his house for 50 hours while saving 50% of wood ! The stove is the heart of the house and it is important how much heat it gives off, how much wood it saves and how long it heats ! The unique bell technology during the construction of the furnace allows not only to retain heat but also to significantly reduce the emission of soot