The Russian stove, another typical masonry heater, evolved in Russia in 15th century, after the brick flue was added to the traditional black-fired fireplace, which lacked the smokestack and vented directly into the room. The addition of the flue allowed for the better heat utilisation by passing the smoke and gases through the brick labyrinth called  (, 'knees' or 'bends') before allowing it into the smokestack.
The Russian stove, another typical masonry heater, evolved in Russia in the 15th century, after the brick flue was added to the traditional black-fired fireplace, which lacked a smokestack and vented directly into the room. The addition of the flue allowed for better heat utilization by passing the smoke and gases through the brick labyrinth called  (, 'knees' or 'bends') before allowing it into the smokestack.