Accumulator tanks (BAGV) are used to accumulate heat during interruptions in the operation of the boiler plant. As a rule, such a unit is installed in schemes with solid fuel boilers (HF). Much less often, it is used to service solar collectors and typical electric heaters.

BAGV device

Structurally, the hot water accumulator tank is a tank in the form of a cylinder or a regular square. Several pipes cut into its body, the number of which depends on the characteristics of the heating system. The latter refers to the number of circuits and heating devices provided for in it.

The demanded volume of the tank depends on the heated area (it is chosen in the range from 200 to 3 thousand m³). For long-term heat conservation, the tank is sheathed with a layer of heat insulator with a thickness of 5 to 10 cm.

Depending on the model of the tank, it includes the following components:

  1. Heat exchangers (there are several of them).
  2. Electric heater.
  3. Magnesium-based anode that protects the tank body from destruction.

Heat exchangers are made in the form of copper coils and are used mainly in double-circuit systems. Electric heaters allow you to maintain the desired temperature of the coolant during short interruptions in the operation of the boiler.

The purpose of the BAGV, which gives its installation and operation

To understand the principle of operation and purpose of the BAGV, it is important to familiarize yourself with the following features of the operation of the unit:

  • under normal conditions, the coolant is heated in the TT boiler and enters the batteries through the pipeline system;
  • there it gradually cools down and returns to the starting point along the return line;
  • in case of an emergency shutdown of the boiler, the coolant cools down quickly until the accident is eliminated and the next laying of firewood or pallets;
  • temperature in the room during this time has time to decrease.

When integrated into the BAGW system, the problem with coolant cooling is removed.

After the TT boiler is started, the coolant will begin to move along a limited circuit (between the hot water tank and the heater). As it heats up, the latter gradually fills with liquid (photo on the right). As soon as the tank is completely full, the circulation pump turns on. With its help, the heated coolant is pumped into the heating system.

When the fuel burns out and until a new bookmark, the system operates due to the heat accumulated in the BAGV. At the same time, the temperature in the rooms is always maintained at a comfortable level.

BAGV device

Correct installation of the BAGV

According to the requirements of technical standards, the water accumulator tank is connected by branch pipes parallel to the boiler equipment. For these purposes, pipes of a certain diameter are suitable, into which control devices are built. The binding kit includes the following required knots:

  • 3 way valve.
  • Booster pump installed in the return line (between the boiler and the BAGV).
  • Protective devices.
  • Heat exchanger for hot water.
  • Valve 3-way.
  • Circulation pump (it is located between the tank and heating batteries).

At the initial stage, a flat concrete platform is prepared, after which the BAGV is set on it strictly according to the level.

Important! The upper branch pipes are located higher than the set of heating batteries.

Accumulator tanks for hot water supply

Their arrangement ensures natural circulation in the system in the event of a pump failure.

Then a pipeline coming from the boiler is connected to the upper pipe. On the other hand, the nearest radiator section is connected to the BAGV. In the supply branch, a security group is mounted, consisting of the following devices:

  • Typical manometer.
  • Special safety valve.
  • A valve designed to bleed air.

Upon completion of these operations, a 3-way valve is installed to protect the equipment from excess condensate. A circulation pump is mounted in front of it, through which heated water is pumped into the storage tank.

The lower branch pipe from the batteries is connected to the return, and on the other hand to the boiler equipment. Special plugs are screwed onto all unused pipes. At the final stage of work, the electrical equipment of the system is connected to a 220/380 Volt network.

Upon completion of the installation, they proceed to a test check of the functioning of the system, to which specialists should be invited. Invited masters will help to adjust the operation of all components of the structure and check them for operability.


In modern conditions production of containers and reservoirs for the accumulation of GW put on an industrial basis. For an ordinary consumer, it is not difficult to purchase the desired model for a certain amount. The main thing is to deal with the BAGV device and the correct methods for installing the purchased equipment.


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