Where should a double-circuit gas boiler be installed + its connection diagram

The creation of an autonomous heating system begins (or ends) with the installation of a gas boiler.

This procedure is one of the most important and critical stages of work, although it is not fundamentally difficult.

Depending on the design features, additional actions of various types may be required.

This applies to installing your own chimney of one type or another, connecting the boiler to a common chimney, choosing a location and other actions.

In the process of work, many issues arise, both technical and organizational and administrative, which should be discussed separately.

Where should a double-circuit boiler be installed?

Installation of a double-circuit boiler must take into account several requirements:

• The design features of the unit itself are outlined in the user manual.
• Current norms and rules for the installation of gas installations.
• The location of the common chimney, the specific placement of the heating system and other features of the system.

Most double-circuit boilers require connection to a special coaxial type chimney. This is a short unit, arranged like a “pipe in pipe” .

It is passed through the outer wall at the installation point of the unit, connected from the inside to the flue gas outlet, and from the outside it is designed according to its own operational requirements (special cap, mesh fencing or other protection elements).

To install such a chimney you need an external and strong wall . Typically, such units are installed in the kitchen.

If the boiler is of an atmospheric type (with an open combustion chamber), it requires a separate room with an area of ​​at least 8 m2, which has its own window opening.

Floor-standing boilers, as a rule, have large dimensions and weight, so they choose separate rooms in the lower floors of the house.

IMPORTANT!

First of all, you should carefully read the instructions, which clearly describe the conditions of installation work and give instructions for their production.

Tying wall models

From the bottom of the gas double-circuit boiler there are 5 fittings with external threads, designed to connect the following lines (from left to right):

1. Supply of heated coolant to the heating system.
2. Output of hot water directed to consumers (bathroom, kitchen, etc.).
3. The gas pipe connection is located in the middle.

   
   Typical wiring diagram for a double-circuit wall-mounted heat generator

4. Cold water inlet.
5. Return pipeline from the heating network.

The location of the pipes on all suspended units is the same. If you are interested in knowing the reason for installing the fittings in this order, we suggest watching a video about the operating principle of a double-circuit wall-mounted heat generator:

Important note. Five outputs are far from a sign of a boiler with two circuits. Manufacturers of water heating equipment often supply single-circuit heat generators with additional pipes for connecting an indirect heating boiler, placed in the same order.

To connect a gas unit to the heating and electrical lines of a private home with your own hands, prepare the following set of products and materials:

• ball valves with American sizes ½ inch - 3 pcs.;
• the same, with a diameter of ¾” – 4 pcs.;
• mesh filter for water and coolant (also known as a mud filter) – 2 pcs.;
• gas filter;
• expansion tank;
• pipeline fittings – tees and elbows;
• three-core electric cable brand VVG with a cross-section of 2.5 mm²;
• automatic two-pole switch with a rating of 20 amperes.

This list is recommended for wall-mounted boilers of the poorest configuration, equipped with an open combustion chamber. Products of the middle and highest price categories, which are mini-boiler rooms, are equipped with their own gas filter and expansion tank.

It is recommended to compare the dimensions of the standard heat generator tank with the amount of coolant in the heating system, following our instructions. In a situation where the pipeline network is too large and the tank volume is insufficient, an additional membrane tank must be installed.

Connection diagram to the heating system

In reality, wiring a dual-circuit heater is not a problem; there are only a couple of nuances, which we will consider further. You need to understand one thing: a gas boiler is a reliable product; during its entire period of operation it is unlikely to need to be removed and turned off for repairs. Such situations happen 1-2 times during the service life.

A shut-off valve in front of the filter on the heating return is needed to clean it without draining the coolant

Hence the conclusion: shut-off valves are installed primarily to service the heating system. It is unlikely that you will have to cut off and dismantle the heat generator.

Above is a standard connection diagram for a wall-mounted double-circuit boiler, found in every technical data sheet for the product. We expanded it by depicting the wiring and possible consumers. Based on the diagram, perform the tying taking into account the recommendations:

1. Place taps with a diameter of ½ inch (DN15) on the fittings for gas, cold and hot water.
2. Mount valves of size ¾” (DN20) on pipes with coolant. The third tap is for draining/recharging the system.
3. The fittings are screwed down with the American ones.
4. Install mud traps at the inlet from the water supply and heating networks in a horizontal position with their nose down, this makes them easier to clean.
5. Connect the external expansion tank to the return pipeline using additional fittings to isolate and empty the tank, as illustrated in the diagram.
6. Place the drain/fill pipe with a tap at the lowest point of the system.

Advice. It is much more convenient to pack and screw the valves to the fittings before hanging the boiler on the wall. If butterflies or handles interfere with rotation, remove them by unscrewing the nut on the rod. The gas valve is installed through a dielectric gasket.

Two pairs of valves on the heat supply pipes allow you to remove the heat generator and not drain the antifreeze.
For homeowners who fill the system with non-freezing coolant and want to play it safe, an alternative piping scheme for a double-circuit heater is recommended. Thanks to a pair of taps installed on the supply and return, you can dismantle the boiler and service the system without draining the antifreeze.

The scheme is relevant for two- or three-story buildings with water-heated floors and a radiator network, where an additional expansion tank is indispensable. Our expert Vladimir Sukhorukov will reveal the essence of the issue in more detail in a training video:

Connection to the home electrical network

The requirements for connecting electricity are quite simple - you need line protection in the form of a circuit breaker and grounding. If there is no powerful equipment in the furnace room, for example, an electric boiler, then it is not necessary to run a separate cable to the switchboard. Briefly, the requirements are:

1. Place the switch in a safe place where water or coolant will not enter in the event of a breakthrough.
2. The presence of a wire connected to the ground loop is mandatory. If the cord included with the boiler does not have a third core, connect the conductor to the steel body of the heat generator.
3. It is not allowed to use metal heating and water pipes as grounding conductors.
4. Lay the cable in a protective corrugated sleeve.

Simplified diagram of connecting to the electrical network of a country house

For reference. European-made turbocharged boilers are sensitive to the correct phase connection. If you confuse the neutral and phase wires, the electronic control unit will not start the boiler.

In areas with unstable mains voltage, it is better to power the unit through a stabilizer that protects the electronics from burnout. Frequent interruptions in the power supply are a reason to purchase and install an uninterruptible power supply unit, otherwise if there is a shutdown you risk being left without heat.

What requirements must be observed during installation?

When performing installation work, you will have to combine two types of requirements:

• Installation conditions set out by the manufacturers.
• Norms and rules for working with gas equipment.

The installation procedure is always described in detail in the instructions. Even if there are no specific requirements, any manufacturer must outline the procedure.

To install wall-mounted units, you must:

• The presence of a strong, ideally load-bearing wall, capable of supporting the weight of the boiler.
• Installation on thin or plasterboard partitions is prohibited.
• Gas boilers with an open burner require a separate room. If installation is in the kitchen, there must be a door and window opening.

Floor-standing boilers have their own requirements:

• The installation is carried out on a layer of asbestos covered with a sheet of metal. This seems unnecessary, but most manufacturers, as well as gas service workers, are unanimous on this.
• The room is separate, ventilated, with access to any point of the boiler.
• The distance from the walls to the surfaces of the unit is at least 0.3 m (for some installations it is greater, please check the instructions).
• The room used as a boiler room should be free of trash, flammable materials, and foreign objects. There should always be quick access to the window, and access to the boiler from all sides should be free.

When mounted in the kitchen, it is allowed to use a quick-detachable decorative box with opening doors.

The gas service requirements are a separate list of conditions. The main one prohibits unauthorized actions with gas equipment . According to it, no one, except gas specialists who have all the required permits and approvals, has the right to install, move or perform other actions with gas appliances.

There is a fine for violation. According to the rules, upon commissioning, the owner undergoes instructions, signs in the log and begins to bear full responsibility. In practice, the situation is somewhat confusing, since these rules were developed for residents of apartment buildings.

Therefore, in most cases, some deviations from the norms are ignored, provided that they do not pose a danger.

In particular, they usually make a compromise - the owner can connect the boiler to the gas supply pipeline, but the connection of this pipeline to the main line is carried out by specialists.

NOTE!

According to Art. 7.19 of the Code of Administrative Offenses of the Russian Federation, unauthorized connection to gas networks is punishable (for individuals) with a fine of 3-4 thousand rubles. Any inspector from the gas service can qualify the connection as unauthorized, so all actions should be agreed upon in advance.

Rules and regulations

If you do not adhere to clear instructions from regional authorities, then at the time of inspection, specialists from the gas distribution company will simply refuse to connect the owner to the unit to the gas pipeline. To avoid such a situation, you need to carefully study the requirements and standards, and then adhere to them during the installation process.

Installation is always carried out only after designing the system; this stage must be taken as seriously as possible in order to avoid big problems in the future.

Do I need to coordinate the installation?

The answer is unequivocal - yes, and to say more, obtaining permission and approval from the authorities takes the lion's share of the time in relation to the entire process. It is better to analyze the algorithm of actions in detail; the first thing the owner of a private house or apartment needs to do is visit the nearest office of a local company to obtain technical specifications.

There he writes an application, which will be considered for some time; it often takes 1-2 weeks to draw up the form, after which the person is given the document in his hands.

As soon as the papers are at the owner’s disposal, it is worth starting to order the development of a project, which includes a piping diagram for a double-circuit boiler and other important installation points.

Such orders can be made at the nearest engineering and design office; specialists with proper education check gas communications and carry out the order, having previously agreed on the terms. When the project is drawn up, it should be sent for consideration to one of the services:

1. Gorgaz.
2. Raygas.
3. Regional gas
4. Mingaz.

When purchasing a double-circuit boiler, you should pay attention to the presence of a passport; these documents will also need to be provided.

General requirements for the project

All important points can be found out by reading SNiP 42-01-2002, which contains information regarding the rules for installing a double-circuit boiler. The owner chooses the room in which the equipment will be installed at his own discretion; often in an apartment the unit is installed in the kitchen, but for such a room it is allowed to use devices with a power not exceeding 60 kW.

A separate combustion chamber is provided for units for which this figure reaches 150 kW. There are generally accepted requirements for a room for installing a double-circuit boiler; they look like this:

1. Minimum volume values ​​are 7.5 cubic meters. m, and the ceiling height is not lower than 2 m.
2. It is prohibited to equip basements, balconies, corridors and bathrooms with devices that operate on gas.
3. The walls must be protected from heat; for this purpose, non-combustible materials are used.
4. To organize lighting, there is a calculation algorithm: for 10 cubic meters. m. 0.3 windows will be required.
5. Connecting to the electrical network requires the use of a grounded cable, as well as for circuit options with a boiler.
6. There are separate requirements for the cross-section of the chimney; it must correspond to the power of the equipment.
7. The unit is removed from the wall by 0.7 m; there should also be no obstacles in front of it at a distance of 1.25 m.
8. From the outlet of the vertical chimney to the device you should retreat no more than 3 meters.

In addition to these rules, special attention is paid to the ventilation of the room; it must be in good working order and function well.

Documentation

To approve the project, you will need to provide a package of collected documents, which include:

1. Technical data sheet for the device.
2. Operating instructions.
3. Certificate of compliance with sanitary and technical requirements.
4. Conclusions after passing the examination aimed at inspecting the unit.

If, after performing all the necessary actions, the owner received a written refusal, then employees often make changes that will need to be corrected in order to re-check for compliance with the rules.

Wall-mounted unit installation and connection diagram

First of all, you should carefully study the instructions and prepare all the necessary materials and tools. You can start working only when there are no unclear points left.

If all issues are resolved, proceed with the actual installation.

Let's look at the procedure:

1. The boiler delivery set usually includes a template, according to which holes are made on the wall for anchors and a coaxial chimney. The bearing surface is marked on it.
2. Using a hammer drill, holes are made for the anchors.
3. A mounting plate is attached to the anchor, onto which the boiler is hung. This point cannot be neglected; the plate provides a technological and fire safety gap between the boiler and the wall. Its size must be at least 45 mm.
4. The boiler is attached to the plate using standard elements included in the delivery set. All parts must be used and their quantity must not be reduced. There are often situations when the unit is installed in a corner, thereby violating the condition of having a 30-centimeter gap on all sides of the housing. In this case, there is no possibility to secure elements located in the corner. This setting is unacceptable.
5. Communications are connected according to the location and purpose of the pipes. As a rule, the extreme left and right are the forward and return lines of the heating system. In the center there is a gas pipe connection pipe. the second ones on the left and right are the hot water pipeline and the cold water supply line. This arrangement is most common, but there may be other options. It is necessary to carefully study the instructions and clarify the location of the pipes of the existing model.

The last step is to connect the boiler to the power supply system. This also has its own characteristics . Most volatile boilers are extremely sensitive to changes in supply voltage.

For proper operation it is necessary to use a power stabilizer.

If this is a standard device produced by the boiler manufacturer as an additional peripheral element, then to connect it you will need to insert a plug into the output of the stabilizer, and connect the device itself to the network.

Other types are connected in a similar way. The main requirement will be the presence of a connected grounding electrode, without which the boiler electronics will constantly generate errors (diagnose a stray flame).

After this, the installation can be considered complete and proceed to the next starting operations.

IMPORTANT!

When connecting pipelines, you can be guided by the diameter of the pipes. On some boiler models it is different, which eliminates the possibility of erroneous connection of communications.

Connecting communications

The supply to the gas main and installation of connections is carried out by representatives of the relevant services, since the standards for connecting a gas boiler provide for the performance of this work by organizations or persons with special permission. It is not allowed to do this work with your own hands; you just need to purchase and legalize the meter, as well as buy a gas filter.

Another important step is connecting the gas boiler to the chimney properly. Units whose operation depends on natural draft must be embedded in a vertical shaft or connected to a vertical chimney pipe with a height of at least 5-6 m. When installing a horizontal section of a chimney from individual elements, you must ensure that they fit into one another in the direction of movement combustion products, and not vice versa. The insert into the vertical channel is carefully sealed with materials that are resistant to high temperatures.

Since automation equipment, electric drives and the circulation pump, which power the vast majority of heaters, are powered by electricity, you will need to connect gas boilers to the electrical network. There are no big difficulties here; it is important to correctly and safely supply electricity to the furnace room and install several sockets there. The requirements are simple:

• The sockets must be grounded, that is, 3 wires must be brought into the room, one of which is grounding.
• Receptacles should not be located near shut-off valves or safety valves.
• The degree of insulation of the wires must be observed in accordance with the operating instructions for the heating equipment.
• Plug or other sockets must be installed so that the wires they plug in do not hang down or touch hot surfaces or equipment.

Do not forget about the dependence of the gas installation on electricity, especially when frequent power outages occur in your area. Therefore, we recommend purchasing an uninterruptible power supply for the boiler. Otherwise, you risk being left not only without light, but also without heat in the house.

Installation of the floor model

Since installation is carried out on the floor, it is necessary to provide it with sufficient strength and rigidity. A cement screed or reinforced concrete slab is required; floor units should not be installed on wooden floors.

There is no direct prohibition on this installation method, but we must remember that wood is prone to warping, drying out, and cracking. Over time, the stability of the boiler may become impaired, which will entail very undesirable consequences.

If possible, a floor-standing boiler should have its own foundation . This is done for powerful and massive models, but you need to take care of flexible adapters, since the position of your own base relative to the general foundation may change, and a significant load will be created on the pipes.

This may result in leaks or destruction of connecting elements.

Procedure:

1. Unpack the boiler and check for the presence of the necessary documentation. Make sure the device is complete.
2. Place the boiler on a prepared non-combustible base. Carefully align it horizontally. To do this, you need to use all the possibilities - when building the podium, ensure that the horizontal support plane is as level as possible, and use height-adjustable boiler supports. As a last resort, you can place tiles made of non-combustible material under the legs.
3. Connect the chimney.
4. Connect the direct and return pipelines of the heating system. On the return side (the flow coming from the system to the boiler), it is necessary to install a filter to remove metal particles, scale and other small elements. This will help preserve the boiler heat exchangers and increase its service life.
5. Connecting hot and cold water pipelines is no different from connecting a heating system. A filter must also be installed on the cold water supply pipe. Some experts recommend installing shut-off valves; this will help quickly shut off water under pressure.
6. Connect the gas pipe through a special shut-off valve. This is mandatory; there must always be a shut-off unit that allows you to quickly stop the fuel supply. You can only connect the gas pipe to the boiler yourself. Only a gas service specialist who has a permit and all the necessary documents has the right to connect to the main line. He will also check the quality of the connections using a soap solution.
7. The power connection should be made using a special socket with a grounding electrode. It is strongly recommended to use a voltage stabilizer so as not to spend money on expensive repairs to the boiler electronics.

The last step will be another thorough check of the correct connection, strength and reliability of the pipeline connection.

After this, you can begin setting up and launching for the first time.

Installation of a floor-standing device

If a double-circuit heat generator requires power supply, then it is connected in the same way as a wall-mounted “colleague”. The energy-independent device has a built-in copper or stainless steel coil for heating water. Apart from the burner, automation and heat exchanger, nothing is supplied with this equipment.

To install a non-volatile unit, you will need a set from the previous list plus the following system elements:

• safety group, the safety valve of which is designed for the operating pressure of the boiler (data is in the passport);
• expansion tank with a volume of 10% of the total amount of coolant;
• circulation pump.

A safety group is always installed on the supply pipe next to the heating device to protect the most expensive part of the system from destruction during a sudden pressure surge.

The distance from the boiler to the device should be no more than 50 cm. Taps and tees must not be installed on the pipe section between the heater and the element; the line must be left clean

If the floor-standing device is connected to a gravity system, only an open-type expansion tank with overflow is installed. The pump and safety group are excluded from the diagram.

In this situation, pipes with a diameter of 40 mm or more are needed, which are laid at a slope of 5 mm for each linear meter of the main line. The heat generator remains at the lowest point, the tank is located at the highest.

If electricity is connected, it is permissible to organize forced circulation using a pump. In this case, its installation is carried out through a bypass

Most modern systems include a circulation pump , which is efficient but dependent on electricity. When the lights are turned off, heating and water heating are turned off. It is wise to organize an alternative natural circulation method for force majeure.

How to connect a boiler

There are different options for installing a boiler, depending on its design.

Can be used:

• Indirect heating boiler with heat exchanger.
• Layer heating boiler.
• Electric storage boiler.

The most accessible and inexpensive option is an external stratified heating boiler. It is not equipped with its own heat exchanger, so it is inexpensive and easy to operate.

Any type of connection is made according to the user instructions. The process is not difficult at all, you just need to connect the boiler inlet and outlet to the corresponding boiler pipes, and also connect the hot water collection line to its outlet.

Depending on the design, a connection to a break in the heating circuit supply line, or a direct DHW outlet from the boiler can be used to accumulate hot water in a container.

Work principles

The functioning system of a double-circuit gas boiler is simple. In automatic mode, the heating circuit is used. No heat flows into the second circuit, designed to provide hot water: a special valve prevents it. When hot water is turned on, the same valve blocks the flow of heat into the heating circuit. At this moment, the heat supply is directed to the second circuit, due to which the water is heated. Thus, hot water is available as needed, and not constantly, which eliminates excessive consumption of coolant (gas).

Installing a coaxial pipe step by step

The coaxial chimney is installed in close proximity to the boiler, along the axis of the chimney outlet. A hole must be made in the outer wall, 5-10 mm larger in diameter than the external size of the chimney.

This is done using a special diamond crown, or with a conventional hammer drill (which takes a long time and will require additional plastering and finishing work).

After that:

1. The base of the coaxial pipe is connected to the boiler chimney outlet.
2. The first chimney segment is installed. Immediately securely fixed with all appropriate fasteners.
3. After it, the second section of the chimney is connected, the whole procedure is repeated. All pipe sections required by installation conditions are connected in a similar way.
4. The joints of the pipe and the gap between the chimney and the wall are carefully sealed.
5. The performance of the chimney is tested.

A through hole in the wall is made with a slight inward slope so that condensate can drain into a special container. If this is not done, the chimney outlet will freeze in the winter.

Difference between closed and open chambers

The answer is quite simple and clear: in their design features, the method of oxygen absorption.

It is worth understanding that in a residential building you need to resort to an option such as a closed one, since only this will be acceptable for use in private buildings. Open spaces require a separate room.

Studying the process diagram, it can be noted that the air, which ensures normal and stable operation, is absorbed through a coaxial chimney from the external space. In the future, the already processed substances also move from the premises to the street. So there is no need for extra costs and expenses for additional ventilation devices.

It is worth resorting to purchasing an open version only for their installation in boiler rooms. Its operating principle is the absorption of oxygen from the oxygen contained in the room. Therefore, it is important that regular and stable ventilation of the building is ensured.

The main rule is to install a gas boiler completely separately from the house, which ensures safety, since the likelihood of leakage of gas and substances formed during combustion is reduced to a minimum, which is due to the non-use of air from the house. To completely eliminate the possibility of emergency situations, it is worthwhile to first undergo a thorough inspection of the pipeline for the presence of various types of distortions, scratches and damage.

Look at an example of converting a boiler room from an open boiler to a closed one:

The advantage of installing a boiler with a closed chamber

1. When getting rid of the products consumed in the isothermal process, a reverse reaction occurs - cooling, which dramatically increases the safety and reliability of such boilers.
2. The room equipped for this device does not overheat and is protected from various and numerous air pollutants, since combustion occurs only on the street, that is, not within the house.
3. High efficiency
4. Air enters the room, the pressure increases, as a result of which its temperature increases. Thus, the closed chamber is environmentally friendly and clean.

There are also disadvantages:

An installed gas boiler with a closed chamber will not be able to operate without electricity. But as soon as electricity appears, all work starts automatically.

How to start the boiler after installation

The first launch is carried out in stages:

• The system is slowly filled with water. This is necessary so that all the air has time to escape. Fill until the pressure is 1-1.5 Bar.
• Check the condition of all connections, look for possible leaks.
• After this, gas is supplied and the boiler is tested. These actions are performed by technicians from the service center. They determine what adjustments need to be made to the factory settings, determine the upper and lower limits of temperature conditions, and perform other necessary actions. Starting the boiler on your own is not recommended even for experienced people, and this procedure is strictly prohibited overnight.

Three options for installing a gas boiler

When installing a wall-mounted gas boiler in a private home, you have three options:

1. You contact the company yourself and order the service of installing a gas boiler at home. The company’s employees not only install the boiler, but also provide post-warranty service, and also place the boiler for servicing. 2. If you do not have the opportunity to order boiler service and installation directly from the company, you will order a specialist to install the boiler. Then the company that sold you the boiler itself sends a service department. It carries out commissioning work and also supplies equipment for service. 3. If you live in a rural area and there are no service centers nearby, then you can do the installation yourself, following the instructions. Moreover, instructions for installing a wall-mounted gas boiler in a private house should be exclusively from the manufacturer. You also need to consider your heating system when installing.

Pipe selection

Currently, the most common are polypropylene and metal-plastic pipes for heating, as they have considerable advantages over products made from other materials.

Polypropylene is considered one of the most durable materials; if installed correctly, pipes made from this material can last for decades. Their cost is not high, but for installation you will have to spend money on special tools and fasteners. During installation, the pipe must not be overheated; it must be quickly fixed in the desired position. This work requires special skills, so it is better to invite a specialist.

Metal-plastic pipes can be installed independently; their installation does not require special elements, except for compression fittings. But at the same time, they last less, and in addition, a serious drawback of metal-plastic pipes is the rubber seal, which quickly collapses. But they are still a better option than copper and steel, which deteriorate even faster (for more details: “Polypropylene or metal-plastic for heating - comparison of pipes”). Gas and diesel double-circuit heating boilers are currently enjoying considerable popularity, but they are dangerous if connected incorrectly. Therefore, without having experience in installing such equipment, it is better to seek help from specialists who can perform all the work correctly. Double-circuit heating system made of polypropylene on video:

Calculation of boiler power and boiler volume

The power of double-circuit and single-circuit equipment with the same heated area is different. In addition, the calculation of the power of a heating boiler is also influenced by the fact that double-circuit boilers are also used to heat water for domestic purposes. But it is worth considering that the power should not be too high either. If the boiler power is calculated correctly, the temperature in the combustion chamber will not exceed 90 degrees, and the durability of the equipment will increase. For example, for a house with an area of ​​100 square meters, the boiler power should not exceed 38 kW.

The power of the heating boiler depends on its operating conditions. Most often there are two numbers on it, the first indicates how much energy it consumes in heating mode, and the second - when heating water quickly.

The boiler capacity is also calculated based on the conditions of its use. So, 10 liters is enough for washing dishes, 30 is enough for a quick shower, and 100 liters is enough for washing and taking a hot bath.

If gas double-circuit heating is used, the diagram involves connecting gas meters. This device must be taken into account when planning work.

Premises requirements

There are several rules that must be followed when choosing a room to install the unit:

1. The presence of a window that can open at any time.
2. Functional ventilation.
3. The room must have outlets for all necessary pipelines to which the home boiler will be connected. Particular attention should be paid to the gas pipe. It must have a counter.

Usually the connection of similar devices is the same. The only thing that may differ is the location of the pipes. But this does not happen often.