How to connect a heat exchanger to a bath tank

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Important! Box and register heat exchangers are installed inside the sauna stove in such a way as to reduce the contact of the metal surface with the hottest part of the combustion front.

The heat exchanger should receive most of the heat inside the stove not through convection and flowing hot gases, but in the form of infrared radiation from the walls and vault of the sauna stove. To avoid overheating, the heat exchange circuit pipes have to be shielded with stainless steel sheets. As a result, the resource increases, and the water in the heat exchanger heats up more evenly, without boiling and steam fountains.

Wiring diagram of heat exchanger for sauna
Almost all models of heat exchange devices operate on the moj data of gravity or natural convection of water in a semi-closed pipe system. Therefore, when developing a heat extraction device installation scheme, it is necessary to adhere to two rules:

The inlet and outlet pipes of the heat exchanger must be located at different levels, the vertical distance between the lower and upper water supply points must be at least 20-25 cm. The lower pipe is used to supply cold water, the upper one is used to drain boiling water;
Connection to the heating circuit pipes of the sauna stove must be carried out only using flexible connections, and the connecting sleeves must be sealed with heat-resistant silicone.
We are not talking about flexible rubber hoses in metal braiding, they are not suitable for these purposes, even if the label says “for hot water” or something similar.

Important! Due to the strong thermal radiation coming from the walls of the sauna stove, the rubber ages and burns out in a matter of weeks.

Experienced users recommend connecting the tank to the heat exchanger in the bathhouse using flexible stainless steel gas hoses.

The classic installation scheme is considered to be a remote tank for a bath with a heat exchanger. This means that the container with hot water for showering and cleaning the room is located either on the nearest wall or outside the steam room, closer to the shower stall.