How to connect the boiler to the boiler

Not in all cases in the house immediately it turns out to make the connection of the necessary communications. In most cases, the DHW is performed at the end of the repair or during the period when the cold season is approaching. As a rule, a boiler is often installed for this system. But as you know, during continuous operation, this device consumes a large amount of electricity. And in order to make water heating more economical, we suggest you understand how to connect it to the heating system. This will allow the water heater, during the heating period, to use the heating heat energy and only in the summer to heat the water with heating elements. Compare various techniques.

Connection to a double boiler

In order to supply heated water to the water heater from a double-circuit heating system, a three-way valve is mounted. It switches the flow of coolant from the batteries to the water supply circuit coil. In such a scheme, it is important to ensure that a signal is applied to the three-way valve. There is also no need to install a recirculation pump on the coil. The main work is carried out by the heating system, which contains this device in its configuration. A recirculation pump is only necessary if the system includes a thermostat. As a result, when connecting a water heater to a dual-circuit heating system, you can select equipment based on your needs.

To increase the hydraulic circulating power of the heating system, a recirculation pump is mounted. Due to this, it is possible to control / adjust thermal inertia, i.e. hydraulic friction heating.

There are boilers with a built-in boiler, both wall-mounted and floor-standing. Such equipment is more expensive, plus you can completely get rid of excess fittings. But on the other hand, the floor has built-in water heaters up to 100 liters. This imposes obvious restrictions. Moreover, such samples cost around 60 thousand rubles. If we compare with the price of a water heater, then there is a significant difference, which varies within 4.5 thousand rubles. Given this, it is much more profitable to buy a device.

Indirect heating boiler

Let's compare several options for connecting an indirectly heated water heater:

• Using a three-way valve.
• Dual pump system.
• With the use of hydraulic arrows.
• Method of circulation circulation.

Three-way valve

В основании этого метода лежит 2 контура: нагревательный от бойлера и отопительный. Three-way valve будет распределять теплую воду между ними. Для управления клапаном используется автоматика (термостат). Как только температура воды в контуре нагревателя достигает заданной отметки, автоматика подает сигнал на трехходовой клапан. После этого теплая вода поступает в батареи. Этот метод считается наиболее востребованным.

If you set the maximum temperature, it is important to provide to what extent the boiler heats the water. Accordingly, the temperature in the water heater circuit must be set lower than in the connected device. Otherwise, the coolant will be constantly sent to the water heater.

Bi-pump system

Pumps will direct warm water to different circuits, i.e. connection of the water heater occurs in parallel. Each line is equipped with a pump, whose operation is controlled by a thermal sensor.

A check valve is introduced into the system after each pump. This will prevent conflict between the two branches.

When DHW is turned on, the heating temporarily stops working. Given the fact that water is heated in a water heater in a short period of time, hot water in radiators will not reach the critical temperature. If 2 boilers are used, the DHW heating and heating operation will be uninterrupted.

Diagram with hydraulic arrow

When using circulating pumps, it is important that the flows are equal. To do this, you can use the hydraulic arrow and hydraulic distributors. This is especially effective if it is necessary that the heated coolant is directed to the floor heating, boiler and radiators. To level the pressure difference in the circuits, the parallel action of the hydraulic module with a hydraulic collector. Although they can not use, installing balancing taps. But in this case it will be difficult to install and adjust the system without the help of a specialist.

Return circulation method

This connection technique is only possible if there is a third entrance in the boiler. It will be possible to connect the coolant recirculation to it. Due to this, the process of water heating can be done very quickly. As a result, you will get rid of the problem of draining cold water from the tap until hot. This is a significant savings.

As a result, a loopback highway will be formed through which water will constantly (forcibly) circulate. You will also need to connect the following items:

1. Expansion tank. With closed taps in a hot pipeline, stable pressure will be maintained.
2. Safety valve. It will protect the water heater from pressure surges.
3. Automatic air vent before check valve. This will completely avoid the airing of the pump before starting it directly.
4. Check valve If the system is under high pressure and, as a result, the water overheats, the hot coolant will not get into the pipeline with cold water. It is installed at the entrance to the water heater.

The maximum pressure that is allowed in the expansion tank is not allowed above the set pressure in the safety valve.

So, we have considered the main options for connecting the indirect heating water heater. Highlight the pros and cons of this method:

Advantages:

• It is possible to use several heating devices simultaneously.
• Recyclable.
• DHW and heating flows are separated.
• High performance.
• Significantly unloads the electrical network during the heating period.
• The internal surface of the water heater does not come in contact with running water.

Disadvantages:

• More costs are required to retool the heating system.
• The first water heating takes more than one hour.
• It is necessary to have a separate room in which all the equipment can be located.

Connection of a boiler to a single-circuit boiler

In this case, a circuit is used where 2 pumps are mounted. This will completely eliminate the use of a three-way crane. Above has been described a similar system, where the contours run in parallel. As soon as the thermostat gives a signal, the pumps leading to the tank are turned on. It is also necessary to install a check valve that prevents the mixing of the coolant.

To gas boiler

With this connection of the water heater, the return circulation method is also used. In this case, the coolant circulates continuously under the influence of the pump. Due to this, heated water enters the faucet faster.

To solid fuel boiler

In this case, it is allowed to have at the same time a system that will allow emergency release of the coolant and the possibility of connecting the DHW. Often thermostatic taps are mounted on batteries, but be aware of the risk of overheating. If a water heater is installed, then there is no such problem, because excess warm water will be sent to the tank. But remember that such a connection of the boiler is possible with natural circulation.

So, the following security group is necessarily mounted:

• Shut-off valve.
• Drain cock.
• Cut-off valve and check valve.
• Pump on the water heater.
• The valve in the feed.
• Water heater safety group.
• Expansion tank.

Mistakes made during installation

When carrying out installation work, it is important to avoid any mistakes. This can lead to unpleasant consequences. For example, it is important not only to take care of the proximity of the water heater to the boiler, but also to set the correct direction of the pipes to the pipeline for easy installation. Another common mistake is incorrect connection of the pressure pipe and the coolant inlet. Cold water is always supplied to the lower nozzle and hot water to the upper part of the water heater. There is also the risk of incorrectly connecting the pump. It is important to observe the parameters set out by the manufacturer.

So, we have considered with you possible methods of connecting the water heater to the heating system. We hope this information will be useful for you and will help you complete this task yourself. To help also provide schemes and video.

Video

The principle of operation of the indirect heating boiler is shown in the video: