I heat my home with a version of this idea, this being a cast-iron wood-burning stove connected to a "rörslinga" - a chimney flue manifold which first goes up,

I heat my home with a version of this idea, this being a cast-iron wood-burning stove connected to a "rörslinga" - a chimney flue manifold which first goes up, then left, then down to the floor, right and then up again. This flue continues upwards through a massive brick chimney I built which contains 6 channels, 1 of these being a ventilation shaft, the other 5 flue channels for different wood-burning devices. The chimney is uninsulated and goes through the unheated but well-insulated 2nd floor, then through the roof. The flue gas temperature at the top of the chimney is well below 100°C since most heat has been deposited in the lower sections of the chimney. This way we heat our 17th century farmhouse with the mentioned stove and a wood-burning kitchen stove ("vedspis" in Swedish) which is built into a massive brick enclosure which also absorbs heat. The combination of the quick-heating cast-iron stove (A Jøtul F400, 7 kW nominal, 84% efficient) and the "rörslinga" provides both quick heat for getting the room up to temperature as well as lasting heat for the night. It generally only takes a single good fire to warm up the place and keep it warm through the night followed by a small fire in the morning to bring up the temperature a bit. When it gets cold outside - -15°C or below - I tend to add an extra load of wood late in the evening which burns for a few hours in the night, that way it'll be around 18°C in the morning. The sleeping rooms upstairs are kept warm by opening the door to upstairs in the evening and opening the doors to the rooms so warm air from below can come in. This way the temperature there end up around 15°C which is just where I want it to be - not too cold and above all not too warm. There is a "rörspis" - a free-standing masonry stove with integrated "rörslinga" in the house as well but I have yet to renovate it so we do not use it yet, also because we can keep it warm enough using the two heat sources we now use. Next to those there is a wood-burning oven built into foot of the chimney (or "murstock" as it is called in Swedish) which sees very occasional use. I also made a connection for a stove on the 2nd floor but have not connected it yet because of a lack of need, it gets warm enough the way it is now. Total wood consumption for the house lies between 4m³ and 7m³ per year depending on winter temperatures and types of wood, this includes wood used for cooking. I have yet to cut a living tree for firewood as there always is enough storm-felled wood in our 15 hectares of forest to satisfy our needs.