A large part of the heat energy from flue gases is removed through the heat exchanger of a water bearing insert. A buffer absorbs the energy and distributes it when needed into the heating system. Especially in summer, a solar system can be a useful addition as it takes over the water heating while the oven is paused.
We consider the Brunner Heating-Center very convincing. It offers a compact system with fixed connection points, guaranteeing function and safety. More specific explanations about the classic connection of a water-bearing furnace with the existing heating system can be found in the LEDA booklet (german).
More information can be found here: