The Russian stove is a type of masonry stove that first appeared in the 15th century. Wikipedia

A kind of oven/furnace that first appeared in the 15th century, used for both cooking and domestic heating in traditional Russian, Ukrainian and Belarusian households, and designed to retain heat for long periods of time by channeling the smoke and hot air of combustion through a labyrinth of passages. Wiktionary

A type of oven. Wiktionary (translation)