There are three optimal options for heat removal from a chimney:

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Solid or liquid fuel stoves produce a large amount of heat, but a lot of it goes unhindered into the chimney. A heat exchanger on the chimney pipe will help you not to lose useful energy and stop mint data the street. A simple and compact device can increase heat output by almost a third without reducing the characteristics of the stove itself, but you should take into account a number of factors, such as maintaining normal draft and the ability to clean the chimney, so as not to get into trouble with the heat exchanger.

Operating principle
When burning liquid fuel or coal, especially in homemade stoves, the temperature of the gases at the chimney inlet reaches 600°C and even higher. Such temperatures are not necessary to maintain active draft, they only worsen the situation. Nothing prevents you from taking some of the heat without damaging the operation of the stove and giving it to the air in the room or to the water in the heating system or hot water supply. So, if you reduce the gas temperature from 600°C to 400°C, then depending on the quality of the heat exchanger and the volume of flowing gases, the heating power can reach several kilowatts.

The task is to ensure active heat exchange between the superheated gases escaping from the stack and the target environment: water or air. The key is the contact area. For example, placing air ducts or a water pipe coil inside the chimney is not the best idea; even taking into account all other features, any objects in the channel will only contribute to the formation of soot and condensate, which will quickly disable the chimney and, accordingly, turn the operation of the stove into a dangerous event for others.


Coil around the chimney.
Water jacket. A cylinder of a larger diameter is placed over the chimney pipe and filled with heat carrier. Dividing the chimney channel into a group of smaller diameter channels allows increasing the contact area.
Chimney brake. The chimney channel is formed in the form of a coil, a labyrinth, through which the movement of gases slows down, which increases heat transfer.