Many people, having problems with central hot water supply in an apartment or house, decide to install an indirect heating boiler. It is considered economical and convenient to use. But how is the indirect heating boiler connected? There are several basic methods that are suitable for both an apartment and a country house.

What’s this?

Indirect heating boiler — a container of a cubic or cylindrical shape, inside which a heat exchanger is installed, in most cases made in the form of a spiral coil. A coolant from the heating system passes through it, with the help of which the water in the tank is heated. Such systems are well suited for small houses.

The water heater in most cases does not have its own heat source. It uses the energy of external heating. It can be a central system or a separate boiler. Therefore, for each case, its own scheme for connecting an indirect heating boiler is used.

Heating connection

Such water heaters are mounted to the heating and water supply system. For everything to work well, you need:

  • supply cold water to the bottom of the unit;
  • ensure hot outlet from above.

In this case, heating is supplied in such a way that the coolant moves down. It turns out that the hot stream enters through the upper pipe, and the cold one exits through the lower one. It is through this connection that it will be possible to achieve high efficiency.

Connection via 3-way valve

This type of connection is based on two circuits:

  • heating;
  • heating.

By using a three-way valve, an even distribution between the two lines is ensured. The main priority is the water supply system, and only then the heating.

At the same time, there is no need to control the valve — everything works automatically. For this, a thermostat is provided, which, when cooled, switches the valve, and water from the heating system is supplied to the heater. When the temperature in the heater rises to the desired level, the direction of fluid movement again changes, and it is supplied to the radiators.

In most cases, the installation of an indirect heating boiler is carried out in this way. The fact is that the system is simply indispensable in the case of using a large amount of water in the house.

Important! When setting the thermostat operation limits, it is necessary to take into account to what mark the liquid in the boiler will heat up. Therefore, it is recommended to set the temperature on the device slightly lower than on the heating unit. Otherwise, the latter will have to work almost constantly on the water heater.

Use of two pumps

Another good option is to install a check valve and two pumps. In this case, each node is controlled by its own pressure generating unit. The connection of the indirect heating boiler to the boiler is carried out in parallel with other nodes, but it has priority.

Circulation pumps are installed in front of the water heater and heating system. For control, a temperature sensor is used, which sends appropriate signals to the devices.

Such a system is considered very suitable for heating based on two boilers. At the same time, one of them completely transfers energy to the radiators, and the second has an outlet to the water heater.

If the liquid in the water heater cools down, the coolant is sent for heating, and when the temperature rises to the desired level, it switches to heating. A non-return valve is used so that the coolant flows do not mix with each other.

And there is no need to worry that this will affect the heating of the room. Water in such boilers heats up quickly — less than an hour. And because the room just does not have time to cool down.

Connection with hydraulic switch

Connecting the boiler to a double-circuit boiler using pumps is often carried out using a hydraulic arrow. Typically, such circuits are built into multi-loop systems.

Basically, this option is used if there are several heating segments. It can be a hot water boiler, radiators, underfloor heating and so on.

Here the hydraulic module and manifold are configured. This will remove possible pressure drops in different parts of the network.

Of course you can install balancing valves. But this requires special skills and experience. In addition, it may be difficult to use in the future.

Return circulation

This scheme is implemented if the third input is placed in the tank. It is to him that the recirculation of the coolant is connected. The main purpose of this system is to increase the rate of supply of heated water. As planned, it should be supplied instantly — when the tap is opened. Thus, there will be no overflow of liquid at the moment when the drain occurs.

It turns out that a looped highway is being created, along which the flow is constantly moving. It is controlled by a circulation pump.

For proper operation, an indirect heating boiler is installed, and some additional components, including:

  1. Check valve. It is installed at the inlet to the water heater. This prevents the coolant from entering the cold pipeline when the pressure rises as a result of overheating of the water.
  2. Automatic air vent. It is located in front of the check valve. This element is necessary to prevent excessive air from entering the pump before it starts.
  3. Safety valve. Protects the heater from pressure surges.
  4. Expansion tank. This component will maintain a constant pressure even when the taps are closed.

Important! In the expansion tank, the pressure should not exceed the values ​​that are set for the safety valve.

The indirect heating boiler is considered the most economical unit of the entire family of heaters. At the same time, there are several options for connecting it to different networks. You just need to compare with the already installed heating and choose the right one.


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