Properly organized water heating systems are self-sufficient in terms of circulation. The movement of water occurs naturally: when heated, it rises, dragging the cold "return" with it.
If the pipes were not laid by a professional, stagnation will form in the system. Warming up of all heating radiators will have to wait a long time, and there is a danger of boiling water in the heat exchanger.
When starting the system after a downtime, especially at low temperatures, the heating of the room slows down, there is a desire to accelerate natural circulation.
Another disadvantage of natural circulation systems- airing the system. The resulting air lock blocks the heat transfer of the media, and you are faced with the same problems. A small section of the pipe is heated, there is a risk of overheating the boiler.
The issue is solved by installing a pump in the heating system.
This is a compact electrical device for the artificial circulation of water in the system. It does not have to be installed simply in a pipeline break, the most typical installation scheme is a bypass. That is, under normal conditions, when the heating system is functioning normally, the coolant circulates due to thermal convection.
When it is necessary to provide forced movement, the section of the pipeline parallel to the pump is blocked, and circulation is provided by the turbine.
Circulation pump installation- the procedure is simple, but there are rules and nuances of the operation of this device (however, as with the installation of any household appliances). If the turbine is installed incorrectly, you will at least get the opposite effect, and possibly make the operation of the heating system unsafe.
Correct installation of the circulation pump in the heating system
Before purchasing a pump, you need to understand which model is right for your system. 
The principle of operation and types of circulation pumps
With the principle of work, everything is clear- an electric motor drives the turbine impeller, which creates a pressure difference between the inlet and outlet of the pump. In accordance with the laws of physics, there is a forced circulation of the liquid.
Piston and other specific water pumping systems are not used in everyday life, due to their bulkiness and incomparable performance.
How to install a Grunfos circulation pump - video.
By design, circulation pumps are divided into two types:
wet rotor
The moving part (the motor rotor connected to the turbine impeller) is constantly in the water. The electrical part: the stator, contact groups, brushes are separated from the rotor by a sealed glass. So everything is in order with safety and protection against electric shock.
Due to the constant washing with running water, the rotor is cooled, and its bearings are lubricated with a coolant. This increases the life of the device. In addition, this design ensures quiet operation. 
There are also disadvantages. Firstly, - low efficiency, no more than 50%. Second, low performance. A powerful impeller (and, accordingly, a large rotor) is difficult to seal, so "wet" pumps are used in small systems with a short pipe length. The compact dimensions allow the device to be installed neatly and discreetly.
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For private houses with an autonomous heating system with natural circulation, one common problem is inherent. The fact that the coolant circulates through the system unevenly leads to the fact that the heaters warm up unevenly. Installation will help to cope with such nuances. circulation pump.
In this article, we'll show you how to connect circulation pump into the heating system.
Circulation pump in the heating system
Installation of the circulation pump in the heating system
Proper installation of the circulation pump in the heating system involves its installation through a bypass pipe - bypass. In this case, when the electrical energy is turned off, the system will switch to natural circulation without difficulty. In order to start the water directly, it is enough to close the valves on the bypass.
Installing a circulation pump on the bypass
Many users are constantly wondering: where is the circulation pump placed in the heating system?
It is mounted on the return pipe between the extreme radiator and the heating boiler. This is due to the fact that the pump does not push water, but sucks it in.
Under the influence of the hot coolant in the supply pipe, its elements break very quickly. In the middle of the pump and boiler are mounted only manometer, thermometer and pressure relief valve. The filter is installed.
In any heating system, a large amount of various debris accumulates: scale, silt, etc. If you neglect the installation of the filter, then the pump impeller will become clogged very quickly, and as a result, the equipment will fail.
It is very important to put it right circulation pump for heating. That is why, when performing this procedure, you must use the following recommendations:
- If the tie-in is performed in an already functioning network, then before making it, it is necessary to drain all the water from the system. The pipeline must be thoroughly flushed.
- After the installation is completed, the system must be refilled with water.
- All connections must be lubricated.
- At the last stage, you need to open the central screw on the pump housing and release excess air from it.
This is how the circulation pump is connected to the heating system.
Where to mount the pump - for supply or return?
Users are constantly tormented by the question: is it possible to put the circulation pump on the feed? Despite the large amount of different information on the Internet, it is difficult to understand where it is still correct to install the pump for heating so that there is forced circulation of water in the house.
Information regarding this issue is very contradictory. Many say that the device should only be installed on the return pipeline, arguing that:
- the temperature of the coolant at the supply is much higher than at the return, and therefore the pump will not operate for long;
- the density of hot water in the supply line is lower, so it is difficult to pump it;
- the static pressure in the return line is higher, which makes the pump easier to operate.
Sometimes a person happens to get into a boiler room, which provides central heating for apartments, and sees that the devices used there are embedded in the return line. Based on this, he concludes that such a decision is correct, not taking into account the fact that in other boiler rooms pumps can also be installed on the supply pipe.
Experts respond to the described statements as follows:
- household circulation pumps designed to operate at a maximum coolant temperature of 110°C. In home heating systems, the coolant rarely heats up to more than 70°C, and the boiler heats water to no more than 90°C.
- The density of water at 50°C is 988 kg/m³, and at 70°C it is 977.8 kg/m³. For a device that develops a pressure of 4-6 m of water column and has the ability to pump about a ton of coolant per hour, the difference in the density of the transported medium of 10 kg / m³ will not play any role.
- In practice, the difference between the static pressures of the coolant in the supply and return lines also does not have any significant effect.
The conclusion is simple: circulation pumps for heating can be inserted into both the return and supply pipelines of the heating system of a private house. This factor will in no way affect the performance of the device or the efficiency of supplying heat to the building.
Mounting position of the circulation pump
As an exception, one can single out - cheap solid fuel boilers of direct combustion, which are not equipped with automation. If the coolant overheats, then it will simply begin to boil, because. burning firewood cannot be put out in one moment. If the circulation pump is at the supply, then the emerging steam, mixed with water, will begin to flow into the housing with the impeller. The process will then look like this:
- The impeller of pumping devices is not suitable for moving gases. That is why the performance of the unit decreases sharply, and the coolant will move at a lower speed.
- Less cooling water enters the boiler tank, which increases overheating, and the amount of steam even more.
- Increasing the speed of steam and its entry into the impeller leads to a complete stop of the movement of the coolant in the system. This causes an emergency and as a result of the pressure increase, the safety valve is triggered, which releases steam directly into the boiler room.
- If measures to extinguish the firewood are not taken, then the valve simply cannot cope with the pressure relief and an explosion will occur with the destruction of the boiler shell.
In cheap heat generators, which are made of thin metal, the safety valve threshold is 2 Bar. In higher quality TT boilers, this threshold is set at 3 bar.
As practice shows, no more than 5 minutes pass from the beginning of the overheating process to the moment the valve operates. If you install the circulation pump on the return, then steam will not get into it and the time interval for an accident will increase to 20 minutes. In other words, installing a pump on the return pipe will not prevent the explosion, but it will give you a delay and you will have more time to solve the problem.
Pumps for heating boilers that operate on wood and coal are best mounted on the return pipe. For well-automated pellet aggregates, the installation location is of no fundamental importance.
Connecting the circulation pump to the mains
If you used the installation method that we described above, then the circulation pump shaft will be in a horizontal position. In this case, air will not collect in it, which interferes with the lubrication of the bearings.
Among other things, when installing the unit, be sure to ensure that the terminal box is placed on top. It is necessary to connect the circulation pump to electricity with strict observance of safety rules.
The power cable must have a plug or switch. The minimum distance between the axes of the contacts is 3 mm. Cable cross section - not less than 0.75 mm. Of course, the pump must be connected to a grounded outlet.
Number of pumps
Most often, one circulation pump is installed in the heating system of a private house. The power of the units produced today is quite enough to ensure the optimal flow rate of the coolant.
Two pumps are mounted in the system in cases where the total length of the pipes is above 80 m.
Operating rules
Today, reliable pumps are produced, which are characterized by a long service life. However, of course, like any other unit, the circulation pump can fail. A number of reasons can contribute to this:
- too strong / weak water supply;
- device operation in the case when there is no coolant in the system;
- with prolonged downtime;
- when the water heating greatly exceeds the norm (over 65 ° C).
Summing up all of the above, it is worth noting that the circulation pump is an integral part of the home heating system. With such a device, you will be protected from all sorts of mistakes, which can later lead to minor and major troubles. You can install the circulation pump both with the help of specialists and on your own. The main thing is to strictly follow the rules of the instructions.
The circulation pump increases the efficiency of the autonomous heating system, allows 100% use of all heating circuits.
Professional installation of the pump for heating guarantees high performance, reduces noise and reduces maintenance and repair costs. Installation of the device does not cause any particular difficulties, but there are a number of nuances that are important to consider.
We will tell you how to choose a circulation pump, help you decide on the optimal scheme for inserting equipment into the system, outline installation requirements, and also provide step-by-step instructions for installing the device.
Previously, circulation pumps were used only in central heating systems, and for private housing construction, the natural movement of the coolant caused by the temperature difference was the norm.
Now forced circulation is used everywhere due to the emergence of compact and inexpensive models designed to service the heating networks of small houses and cottages.
With the advent of circulation pumps, the number of circuit solutions has expanded. It became possible to lay long highways of varying complexity, while the dependence on the slope has practically disappeared
Due to the increase in the speed of the coolant in the pipeline, thermal energy flows faster to the heating radiators, respectively, the premises warm up faster. The load on the boiler has decreased because the heating of water has also become faster.
The need to install bulky and inconvenient large-diameter pipelines has disappeared, it has become easier to mask the contours under the floor covering or deepen into the walls.
It became possible to install a “warm floor” system on any floor of a private house, which effectively operates only at a certain pressure in the network
The main disadvantage of pumps for heating systems is their dependence on electricity. If the power is intermittent or there is a risk of a complete blackout for some period, it is necessary to install a backup power generator or at least an uninterruptible power supply.
The remaining disadvantages relate to the designs and functionality of devices of various types. For example, monoblock units and devices with a dry rotor are noisier and require constant maintenance, while a wet rotor pump is demanding on the quality of the coolant and has a head limit.
Criteria for a competent choice of equipment
All installation efforts will be reduced to zero if you choose the wrong equipment. In order not to be mistaken, it is necessary to first analyze all aspects of a particular heating system and make the necessary calculations.
The main types of pumps
According to the design features, all devices are divided into 2 categories: with a wet and dry rotor.
Wet pumps. This option is suitable for private houses. The unit is compact, almost silent and has a modular structure that is convenient for maintenance and repair.
But, unfortunately, it does not have high performance - the maximum efficiency of modern models reaches 52-54%.
Circulation devices for heating networks should not be confused with similar devices for hot water supply. The heating pump does not need an anti-corrosion housing made of bronze or stainless steel and additional protection against scale - respectively, and is cheaper
Dry rotor pumps productive, unpretentious to the quality of the coolant, able to work under high pressure and do not require a strictly horizontal location on the pipe. However, they are noisier, and their operation is accompanied by vibration. Many models are mounted on a foundation or metal support frame.
For installation of console, monoblock or "In-line" models, it is necessary. It is advisable to use them when a flow rate of more than 100 m³ / h is required, that is, for servicing groups of cottages or apartment buildings.
Specifications at a Glance
When choosing a pump, be sure to study the technical specifications and compare them with the requirements of the heating system.
Important indicators are:
- pressure, which covers the loss of hydraulics in the circuit;
- performance- the volume of water or supply for a certain time interval;
- coolant operating temperature, max and min - for modern models, on average +2 ºС ... +110 ºС;
- power- taking into account hydraulic losses, mechanical power prevails over useful power.
Structural details are also important, for example, the inlet / outlet diameter of the nozzles. For heating systems, the average parameters are 25 mm and 32 mm.
The number of electric pumps is selected, focusing on the length of the heating main. If the total length of the circuits is up to 80 m, one device is enough, if more, additional devices will be required
An example of a unit for equipping a residential heating network with an area of 100 m² is a pump Grundfos UPS with pipe connection 32 mm, capacity 62 l/s and weight 3.65 kg. A compact and low-noise cast-iron device is not audible even behind a thin partition, and its power is enough to transport liquid to the 2nd floor.
Pumps with built-in electronics allow you to quickly switch equipment to a more convenient mode, depending on changes in temperature or pressure in the network. Automatic devices are equipped with digital displays that provide maximum information on the operation of the pump: temperature, resistance, pressure, etc.
Additional information on the calculation and selection of a circulation pump for heating is presented in the articles:
Requirements for the installation of a circulation pump
There are a number of norms that at the legislative level regulate the installation of a circulation pump in a heating system. Some of the rules are set out in SNiP 2.04.05 "Heating ...". For example, it talks about priority in heating networks.
Almost all requirements are justified by the efficiency of the system as a whole and the circulation device in particular. For example, the shaft of a device with a wet rotor must be installed on a pipe strictly horizontally in level so that air pockets do not occur inside and the pump parts do not wear out prematurely.
An obligatory element of the system is an expansion tank, which compensates for changes in the volume of the coolant during heating / cooling. Its place in a closed-type system is on the return line, in front of the circulation pump
A filter against dirt and abrasive particles is needed in any case, even when installing monolithic models. Filtered coolant will bring much less damage to pump parts than liquid with sand and suspensions.
The sump is installed with the stopper down in the direction of water movement to reduce resistance and facilitate system maintenance.
Some rules are dictated by manufacturers. For example, it was customary to install old models of certain brands exclusively on the return line, since they could not withstand high temperatures.
Now pumps have become more versatile and can be placed in any suitable place, but subject to power parameters.
Analysis of the installation technology
The installation process itself is fast, so to fix the case, you need to fix two union nuts. This is very convenient for further maintenance and repair work. But before installation, it is necessary to choose the installation site correctly, otherwise the pump will either work intermittently or will soon fail.
Schemes for tapping the pump into the network
When choosing one of the schemes, it is necessary to take into account the type of heating system, boiler model and ease of maintenance.
Option 1. This is the most common solution: the pump is mounted on the "return", through which the cooled coolant returns to the boiler. Warm water is not so aggressive on the parts of the device, so it lasts longer.
Modern devices can easily withstand high temperatures, but there are still experts who reject such a scheme.
Private dwellings are no longer a rarity today. It has ceased to be something exceptional - to build a good, solid house on your site. All sorts of sheds and temporary huts are gone, but with them, simplicity in construction has also gone. For a good private house, all communications must be carried out - otherwise, what kind of residential building is it? And there are problems with such moments, at least from time to time. The following is an instruction for installing a pump in a heating system - this is a rather important point. Why, in the heating system of a private house - this is one of the most important things!
Device types
After the state decided that it was also possible to register in a private country house, the owners of such buildings began to think about the possibility of living on their own plot. Naturally, for this you need to carefully think through everything and redo it a little. It is not surprising, because to turn a country house into a full-fledged cottage, you should try very hard.
Capital internal heating is one of the most necessary steps in arranging a private house. So it is not surprising that the installation of a pump in a heating system is becoming more and more common. This happens only because no matter what the autonomous part of the heat supply is, for year-round operation it is required to install more and Often they get by with just one pump if there is already heating.
For consumers today there are two main options - water and circulation elements. We'll talk about them below.
water element
The heating system of the house is the most frequently requested service. But we must not forget that there are much more powerful models that can also heat an apartment building. The last option is rather exotic, not a rule. Therefore, it is the heating of an ordinary private cottage that is considered here.
Such pumps are not as popular as circulation pumps, but they still have their own audience of buyers. Installation in a heating system is a great solution if the rest of the system in a small house is already equipped.
Parts required for installation
In addition to the water pump itself, the heating system, the heart of which it should become, also includes several important parts and devices, and ignoring them will be fraught with negative consequences:
Fuel boiler.
. Hydraulic manifold.
. Hydraulic circuit (piping system).
. Radiator.
. Mixing circuit (additional element of the system).
. Sensors for pressure, temperature, water flow.
. Overheat protection system.
. Air outlets.
. Overpressure protection system.
. Air release valves.
It is not worth talking about which element is more important here in such a procedure as installing a water pump in a heating system. All of them are equally necessary, and therefore it is strongly not recommended to forget about something.
Circulation pumps
This is the second type of device that has already been mentioned. It should be noted that installing a pump in a heating system (especially a circulation pump) is not a very complicated, but extremely useful procedure. Naturally, it is better to call the masters who will do the job faster. But, in principle, you can do it yourself. Especially if you ask yourself in advance how to properly install the circulation pump in the heating system.
Benefits of circulation pumps
Undemanding to heat supply systems - that is, all sorts of slopes, narrow sections, etc. will not affect the quality of heating. In addition, these parts are also suitable for a gravity heating circuit (that is, one where there is no own circulation).
. Rapid overclocking of the system - this, as the name implies, provides a quick warm-up of residential premises. That is, installing a pump in the heating system makes it more efficient.
. Reliability of work - simplicity in service and rather simple mechanism of work provide safe and very long operation of the device.
. High efficiency - as mentioned earlier, installing a pump in a heating system increases the efficiency of its operation. The circulation element raises the efficiency of work to the maximum.
Types of circulation mechanisms
As with any other technique, there are several different types of parts. So before you figure out how to properly install the circulation pump in the heating system, it is better to find out which circulation pump is needed. They are of two types:
1. "Dry". They are characterized by the fact that the pump rotor does not come into contact with the coolant. They are mainly equipped with high-rise buildings and large premises. Installing a pump in a home heating system, if we mean the “dry” type, is fraught with some consequences, such as noise. It will create air turbulence, which, in turn, will cause noise, which will interfere with living. That is why such pumps are rarely installed in private homes.
2. "Wet". This type is characterized by the fact that the rotor is immersed in water, which it pumps. It is these pumps that are most often installed in the heating systems of private houses and small residential premises.
Mounting technology
To make it easier for yourself or the work of the specialists who will carry out the procedure, it is best to purchase such pumps and equipment, where there are detachable threads in the package. If this is not available, then you will have to suffer, choosing various adapters. In addition, you will need to purchase a deep filter, as well as a check valve that will ensure normal operation under pressure - and this does not depend on the type or type of element purchased, since installing a pump in a heating system simply requires all these parts.
Among other things, you will need some tools. To tie in the pump, you will need to stock up on different sizes - from twenty-two to thirty-six. This is usually sufficient. You also need shutoff valves and a pipe segment (the latter will play the role of a bypass) with a diameter that is equal to the diameter of the riser.
Choice of tie-in location
So that such a procedure as installing a pump in a heating system does not cause any difficulties, several points must be taken into account. First, take into account the fact that the heat supply equipment must be serviced. That is, the place must be sufficiently accessible for such procedures.
Other nuances
There are other features as well. For example, earlier pumps were installed on the return line - there was an opinion that chilled water, washing the working part of the element, prolongs its service life. Today, there is no such problem, since the details of the mechanisms are resistant to any water temperature. So installing a pump in the heating system for supply or return does not matter anymore.
In order to increase the pressure in the suction zone, it is best to install the part in the section of the supply pipe - it can even be near the point of entry into the expansion tank system. Such a scheme will provide a high temperature in a given section of the network. But for high efficiency, you need to buy an element that is resistant to strong pressure of hot water.
You can see for yourself that the installation location of the pump in the heating system must be strictly defined - otherwise it will be impossible to achieve good efficiency.
Layout of devices in the pump connection
To install the pump correctly, you should follow a number of simple rules:
Ball valves are installed on both sides. This is necessary so that the pump can be dismantled, for example during repair or replacement.
. A filter cuts into the pipe before the pump - this is necessary to avoid the ingress of large mechanical particles along with water.
. The upper part of the bypass is equipped with an air valve. Air pockets are not uncommon in such systems and are best avoided.
. The direction indicated by the arrow on the device must be observed - the movement of water must go strictly in this direction.
. "Wet" pumps are mounted horizontally. This device is protected from serious damage if not the entire electric motor is submerged in water.
. Pump terminals point up.
. Threaded connections are equipped with gaskets and protected with sealants.
. The pump must only be connected to a grounded socket.
Installation sequence
In the case when you mount the pump in an existing network, the coolant must be drained. It is better to clean a heating system with a long “experience” by running water through it several times.
. The functional chain of fittings and pump is observed according to the installation rules.
. After installation and testing of the system, it is filled with water.
. The last stage - the central screw turns, excess air is removed. When water comes out of the holes, the element is ready for use.
The last step is necessary for manual pumps - automatic models handle the air on their own. But if your unit is manual, then this procedure must be repeated each time before turning it on.
One of the main types of equipment that is used in the heating system of a private house is a circulation pump. This device allows you to more efficiently transport the coolant through the system, which will contribute to uniform heating of the premises. In our article, we will describe why an additional pump is needed in the home heating system, get acquainted with the scheme and place of its installation, use in the Underfloor heating system.
Is it necessary and in what cases
Many owners of suburban real estate, and especially two-story houses, are interested in the question of installing an additional circulation pump in the heating system. They come to this conclusion after uneven heating of the radiators in the premises, provided that the boiler has sufficient power. If the temperature difference between the boiler and the coolant in the pipelines exceeds 20 degrees, then it will be necessary to remove air pockets or put the existing pump at an increased speed.
Installation of additional pumping equipment is necessary in the following cases:
- When adding an additional circuit to the heating system, and especially when the length of the pipes exceeds 80 meters;
- For uniform movement of the coolant in pipelines.
Important! In case of incorrect calculations of the heating system, the installation of additional equipment will lead to a decrease in the efficiency of the heating system.
Before installing an additional pump, balance the heating system using balancing valves An additional pump in the heating system may not be needed if it is balanced with balancing and regulating valves, so before buying additional equipment, bleed the batteries and add water to the system. If everything works fine, then there is no point in installing an additional pump.
hydraulic separator
If there is a need to install an additional pump, then another device must be included in such a heating system - a hydraulic separator. In the list of terms used, a hydraulic separator can also be called an anuloid or a hydraulic arrow.
Such devices are recommended to be used in heating systems where the heat carrier is heated using long-burning boilers. The fact is that the heating devices in question can operate in several phases (fuel ignition, combustion process and attenuation), and each of these phases must maintain a certain combustion mode.
Installing a hydraulic arrow in the heating system allows you to create a certain balance in the work of heat and heating the system. The anuloid itself is made in the form of a pipe with four outlet pipes. The main functions of this device include:
- Automatic removal of accumulated air;
- Capturing sludge particles (works as a dirt trap).
Note! From these characteristics, it can be understood that the hydraulic separator is considered an important device in the heating system, so it must be installed without fail in the presence of a pump.
Heating in a private house performs many functions that must be implemented regardless of the coolant flow rate with possible pressure drops in pipelines. It is rather difficult to achieve efficient operation of the system, because the liquid enters the pipeline circuits from one source of thermal energy - the boiler, which will ultimately lead to an imbalance in heating. To prevent such situations, the hydraulic separator serves, it performs the function of decoupling.
Where to put
In an autonomous heating system of a private house, it is recommended to install circulation pumps with a wet rotor that rotate without the use of special lubricants. The coolant and lubricating element here is the coolant. When installing such a device, the following rules must be observed:
- The pump shaft must be in a horizontal position with respect to the floor surface;
- The movement of water flow in the system must match the direction of the arrow on the device;
- To prevent liquid from entering the pump terminals, the box must be mounted on the top or side of the equipment.
According to some users, it is better to install the pump on the return pipeline. Here, the coolant temperature is minimal, which will increase the life of the device, but not all experts agree with this statement. The fact is that the pump is designed for operation in a coolant medium, the temperature of which can reach 110 degrees.
Note! The only requirement for installing the pump is the convenience of its maintenance, that is, such a device can be mounted between the boiler and heating radiators on the direct or return pipeline. Boosting equipment must not be installed between batteries.
Installation scheme
In practice, two schemes for installing a circulation pump are used in a single-pipe and two-pipe heating system. Before carrying out installation work, carefully study the attached instructions. At the preparatory stage of the work, water is drained from the system and the pipes are cleaned of contaminants by additional pumping of the liquid. The pump is installed according to the attached scheme, then the coolant is poured into the circuit and the unit is turned on.
As we have already said, it is best to install the pump on the return line using a tap or, as it is also called, a bypass. Such a device is necessary to shut off the water and replace the pump in the event of a breakdown. The diameter of the outlet pipe must be smaller than that of the central pipeline.
At each end of the bypass, in front of the inlet and after the outlet of the pump, valves are installed for emergency shutdown of the coolant. Another valve is installed on the central line to direct the flow of fluid through the pump. Before entering the pumping equipment, a special filter is fixed, which will accumulate harmful particles in the water.
with underfloor heating
Note! In the "Heat floor" system, the circulation pump is installed in a horizontal position after the mixing unit in the section of the supply pipeline. In some wiring diagrams, several such devices are installed, each of which will pump liquid within one floor.
Pump installation diagram in the "Warm floor" system During the filling of the system with coolant, it is not always possible to get rid of the air present here. Accumulated gases often block the movement of fluid, and not every manifold can be used as a bleed valve. To solve this problem, the circulation pump has a special outlet valve, made in the form of a disk.
To release the accumulated gases, you need to turn this part with a screwdriver counterclockwise. After water is supplied from the slot, the disk is twisted and the pump is started again. This procedure is repeated several times in a row.
