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It is no secret that one of the main components of comfort in the house is the warmth in it. A coaxial chimney will serve as a faithful assistant to solve the problem in private homes. This boiler fume extractor is an effective replacement for aging traditional chimneys.

The device of a coaxial chimney (hereinafter referred to as CD) involves a design of a pair of pipes arranged according to the principle of a nesting doll. The contours of the pipes are connected by jumpers. The design itself is designed to work with heat generators closed type. An example of such is geyser. The inner pipe ensures the removal of combustion products, while the outer pipe serves to supply air from the outside. This allows you to forget about the constant ventilation of the room. The price justifies the means, because boilers with CD, especially from famous company Baxi are much more efficient than traditional ones, and at the same time their maximum length does not exceed 2 m in length. Most often, KD is taken out into the street through a hole in the wall. Much less common is a vertical coaxial chimney leading to the roof.

In addition, there whole line problems that the installation of a coaxial chimney successfully resolves:

• the compactness of the device allows you to save a lot of space;
• an impressive selection of CD models for systems of various capacities, the price of which may surprise no less than their quality;
• ecology and economy: due to its high efficiency, the system not only ensures complete combustion of fuel, but also reduces heat loss(due to heating the air entering through the outer pipe with hot smoke in the inner one);
• the risk of ignition of surfaces in contact with the coaxial chimney is significantly reduced (due to constant cooling of the inner pipe);
• after installing a coaxial chimney, additional ventilation of the room is not required, the design eliminates the possibility of poisoning residents carbon monoxide, whether systems from Baxi or from other manufacturers.

Where does the installation of coaxial chimneys begin?

Before installing a coaxial chimney, you first need to select the type of system - vertical or horizontal (including at an angle). The price here is about the same, but it should be noted that last option requires installation forced ventilation with the device. In addition, the horizontal section of the appliance must not exceed 3 m in length. A vertical AC is recommended if smoke will enter nearby nearby windows or into a narrow street. Always follow the diagram and instructions from the manufacturer (Baxi, Ochag, etc.) for a specific system, which describes in detail the installation rules.

For example, the ratio of the size of the boiler to the diameter of the outlet pipe matters, they must be equal in order to avoid overheating of the channel. And so that the combustion products come out unhindered, pipes, tees and elbows are fastened by a specialist. With your own hands, it is better not to perform the installation of a CD without having the experience of installing a coaxial chimney. Mounting a vertical CD is easier, the main thing is to stock up on brackets. The coaxial pipes themselves are connected into a system using a special transition node. At the joint site, clamps are used that securely fasten the elements.

Chimney outlet and finishing work

The price of success is the accuracy of installation. When removing the branch pipe from the side of the heating device, there should be a horizontal section of the CD. In this case, the level of the branch pipe must exceed the level of both the boiler and the street by 1.5 m or more so that the CD does not become contaminated. The angle of inclination of the outlet pipe is set from 3 degrees. So condensate will not fall back into the boiler. The opening of the branch pipe must be 60 cm or more from the window, and from gas pipes- half the diameter of the CD. In order to circle the device around an obstacle, you can use up to two differently inclined knees. The joint between the wall and the pipe must be insulated with non-combustible materials.

If the branch pipe is displayed vertically on the roof, fire safety requirements must be taken into account. Use fire-resistant insulation, insulating pipes and special protective covers for the flue duct. The pipe and the ceiling must be separated air layer. The outlet itself must be covered with a special apron that isolates the joint.

If the working CD is always cool, even when the geyser is working intensively, then the installation is done correctly. However, everything has its price: in cold climates, the device can freeze. As a rule, this happens when it is horizontal. In this case, you should contact the office of Baxi or another manufacturer supplying heating products to purchase special protection.

Conclusion

To feel the desired comfort in the house, sometimes it is enough to know what a coaxial chimney is and how it is installed. Literally in a few days, as if by magic, the home will be transformed, and life will become even more beautiful. The installation of a coaxial chimney is also done by one's own hands, however, if there are reasonable doubts about one's abilities, it is better to hire an experienced specialist.

Choosing the optimal chimney for gas boiler is not an easy task, but it is quite feasible. After all, I want it to be an extremely simple design in installation and operation, and even with high efficiency. All requirements are met by a coaxial type, the installation of which can become a kind of "snag". Do you agree?

We'll help you sort through some of the more complex issues. We provide site visitors with extensive information about the rules for the construction of a coaxial chimney, about the selection and arrangement of the best option. Here you will find valuable tips for decorating sections of canals laid inside houses.

The article we have proposed describes in detail the norms for installing a coaxial chimney. Given useful diagrams for its competent assembly and installation. The information is confirmed and supplemented by photo collections and video guides.

In the family of devices for removing combustion products, the coaxial chimney stands apart. This modern design much more efficient and safer than a conventional chimney. This system is ideal for boilers with closed camera combustion.

To make a coaxial chimney, you need to take two pipes different diameter and put a narrow pipe inside a wide one. You also need to connect the inside of the wide pipe and outside narrow pipe with special jumpers so that the central axes of both pipes coincide. Well, the coaxial chimney is ready.

In practice, such a design, of course, is easier and more reliable to buy than to make. The cost of a coaxial chimney will be higher than the price of an ordinary pipe made of of stainless steel, but the costs will pay off in full.

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Any heating equipment: a heating stove or boiler, a fireplace or even a simple gas water heater connects common feature: they need to utilize the air that is saturated with combustion products. This is not only a guarantee of comfort, but also safety. Failure to comply with the rules for installing chimneys can even lead to sad consequences - carbon monoxide poisoning.

The latest solution for modern technologies heating is a coaxial chimney. It allows you to significantly reduce the volume of the chimney, in addition, the air from the room is not used at all during operation, which, of course, is important advantage. This type of chimney is suitable for boilers with a built-in smoke exhauster (forced draft). It is much shorter and more compact than a conventional traditional pipe. Its European quality is combined with an excellent price.

The principle of operation of the coaxial chimney

The smoke exhauster, built into the boiler system, allows air to be taken from the outside through the outer pipe simultaneously with the removal of flue gases through the inner pipe. Since the air draft is practically ensured, the outer pipe has a small diameter and a length corresponding to the layout of the installation. Exhaust air containing an admixture of combustion products is ejected from the boiler through the inner pipe. It is also shorter than the traditional one, and the boiler, therefore, does not take up much space. The coaxial chimney is made of modern reliable acid-resistant materials, therefore inner pipe does not react with harmful impurities, that is, it is not subject to destruction.

The structure of such a chimney is such that flue gases do not enter the air duct when they exit. All this must be taken into account when designing a coaxial chimney, installation standards and fire safety including. Another essential condition its reliable operation is the tightness of the connection of the external air duct and the branch pipe.

SNiP for installation

Heating systems operating on gas fuel, are somewhat different from coal and wood stoves. Therefore, if a coaxial chimney is installed, the installation standards are also different.

In the case of this type of chimney flues, combustion products can be vented to the atmosphere through outer wall premises. In this case, in particular, there is no need for a vertical channel from the system, through which the combustion products will be forcibly removed. In this case, the smoke channel opening on the facade of the house is placed according to the installation instructions. gas equipment from the manufacturer, but subject to the following conditions:

• at a distance of at least 2 meters from the ground level;
• the minimum distance to doors, windows and open ventilation grilles (holes) horizontally should be 0.5 meters;
• the minimum distance to the upper edge of doors, windows and open ventilation grilles (holes) should also be 0.5 meters;
• vertical distance from windows located above the opening of the smoke channel - from 1 meter;
• in the area of ​​​​1.5 meters from the coaxial pipe there should not be any obstacles, say, walls, poles, etc.

The chimney, if there is no condensate trap, must be installed at an angle to the ground, preventing condensate from flowing back. The optimal slope is 6–12°.

• If smoke channel placed under a balcony, canopy or eaves of the roof of the house, then it should go beyond the circle with radius R. It is equal to the width of the part of the building protruding above the chimney.
• The smoke channel should not go through the outer wall into driveways (arches), underpasses, tunnels, etc.

When exiting through the wall, the length of the horizontal section of the channel is taken no more than 3 meters. However, in this matter, manufacturing plants allow discrepancies. For example, according to the instructions, the Ferroli coaxial chimney has a maximum allowable length pipes - 4 m (60/100) or 5 m (80/125), and the Navien coaxial chimney - 3 m. it is supposed to be installed, since for different boilers some of the main parameters may not match.
(below are the documents of SNIP, and installation rules for chimneys of some manufacturers)

Coaxial chimneys of the best manufacturers - a guarantee of reliability and quality

Coaxial chimney Ariston
Italian-made Ariston chimneys are suitable for most modern boilers. They also come with sealing gaskets and wall linings.

Coaxial chimney Baxi
The chimney in its design should have a length of up to 5 m. If it is directed to the street, it is given a slope of 1 cm per meter of its length. For the conditions of the Russian climate, insulated options are more suitable with the following changes made to the design:

• elongated head,
• the design of the air intake duct is especially protected,
• made of composite material.

Such a system makes it possible to prevent icing of the chimney and cause the boiler to stop in emergency mode if the outside temperature drops to -50 C.

Coaxial chimney Proterm
These products are very easy to install and increase the efficiency of the respective Protherm boilers. In addition to them, the company also offers extensions for chimneys, adapters designed for separate smoke exhaust and other.

Vaillant coaxial chimney
This company is considered one of the leaders in the European market. Its products are in high demand in last years. When choosing chimney it is especially important that its cross section correspond to the cross section of the Vaillant boiler nozzle. When installing, it is necessary to ensure the distance between the chimney and flammable structural elements at least 100 mm.

Viessmann coaxial chimney
In addition to the coaxial outlet (diameter 60/100, 90°), the kit usually includes: a coaxial pipe equipped with a tip (diameter 60/100, length 0.75 m) and wall plates. Its special design prevents the pipe from freezing in winter period.

Coziness and comfort in the house creates warmth. And in our time there are many ways to heat housing. In multi-storey buildings, heating is central, but the owners of private houses prefer various boilers that directly require a chimney. Through it, the smoke will go out into the street, and not into the living room. Standard pipes are being replaced by more advanced and compact ones.

The coaxial chimney is the latest system with increased level security. It is designed for many gas boilers. The baxi coaxial chimney is especially popular. Let's take a closer look at what a coaxial smoke exhaust system is, with its device, installation standards.

What is a coaxial chimney?

This question is asked by many owners of heating boilers. A coaxial chimney is a design that is assembled according to the “pipe in pipe” principle and is used in heaters, such as: gas boilers, convectors, radiators with buried combustion chambers. The uniqueness of such chimney channels is that it is going this design from several parts that are inserted into each other and held due to the fact that inside this device there are specialized jumpers. They do not allow parts to touch and slide off.

The advantage of these models of chimney channels is that the cold air flows that are needed for draft penetrate through outer pipe from the street, not indoors. Also, coaxial-type chimney channels solve several of the most important issues in heating at once:

• safety during the operation of the chimney is increased due to the flow of cold air through the outer pipe, which cools the inner one;
• carries out the supply of oxygen, which is simply necessary for combustion and the output of burning;
• coefficient increases useful action heating appliances due to the warming of cold air streams on a heated exhaust pipe;
• good efficiency increases the degree of environmental friendliness of heat generators and improves afterburning of gas fuel;
• the entire work process is carried out outside the room, which increases comfort in it when heated by a gas boiler;

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• they reduce the consumption of combustible material and increase the efficiency of the heating system as a whole due to full combustion;
• with low weight and affordable price, they have high refractoriness and high quality steel. Especially these qualities are known for the coaxial chimney for the baxi gas boiler;
• they have a special drain for condensate;
• the risk of fire is reduced to zero, because due to constant circulation, the air temperature in the chimney is reduced to a safe temperature.

Equipment with such a chimney is ecological, as they do not allow the remnants of unburned particles to fly out into the street and enter the atmosphere.

Advice! They are great for homes, as they provide comfort and safety to the owners even wooden houses through their device.

For the current situation in the field of heating, an urgent issue is the arrangement of the selected type of equipment. An important point is the chimney for a gas boiler in a private house or apartment. Today there are a number of products suitable for this purpose, so it is important not to make a mistake in choosing. To do this, you need to take into account specific conditions and comply with established requirements.

Types of coaxial chimneys

They are divided into two types: insulated and non-insulated. The first one is the most suitable for winter conditions and is successfully used throughout Russia.

They are divided into three types by installation:

• vertical coaxial chimney. Can be used if it is not possible to bring the chimney through the wall;
• horizontal coaxial chimney. It is installed when installing forced ventilation of the boiler. The maximum length of the horizontal section is limited. It should be no more than three meters, but still manufacturers set their own limits. Before designing a structure, it is necessary to study the characteristics of the device to be installed;
• inclined coaxial chimney. The rarest installation option and only be used when the other two options cannot be used.

For each boiler, the direction of the chimney is individual.

Installation Requirements

The coaxial chimney, the installation requirements of which are indicated in the passport for each device, is individual, but there are also general ones. Among them:

• To assembly work should be carefully prepared. First you need to choose the right section. It is necessary to carefully study the passport for the boiler and the instructions from the manufacturer, which should contain information about the required length of the chimney;

Advice! If it is not specified, then you should focus on the generally accepted framework. In the very the best options the length of the flue duct must be at least five meters.

• in order for the draft in the chimney to be better, it should be installed slightly higher than the roof ridge;
• they must be installed very carefully and carefully fastened. If the chimney duct is installed incorrectly, leakage or smoke may enter the heated room;
• outlet channel at correct installation chimney should be larger diameter than the exit from the boiler;

Advice! It is necessary to check the data with technical passport on the chimney channel in the field - diameter. This will help avoid mistakes.

• the heating device must be installed one and a half meters lower than the outlet pipe of the flue duct, while the pipe entry must have an angle of at least three degrees. This arrangement ensures unhindered condensate drainage.
• The chimney inlet must be located at a height of at least a meter and a half from the floor. This will keep it from getting dirty.

Advice! If false chimney systems are being installed, its length should not exceed three meters. This will allow the smoke to freely enter the outside.

Required fasteners

The list of elements required for assembling a coaxial flue duct will depend on where the smoke outlet will be installed: from the side or from above. For the first case, a horizontal assembly of the structure will be required, in the second case, the withdrawal of the chimney channel will be much easier. To bring the outlet to a vertical position, brackets of various modifications and clamps for fixing the joints will be required.

Important! It is strictly forbidden to use sealant and homemade adapters for fastening, as this is unsafe and can lead to incorrect functioning of the system.

At right choice elements installation will not require much time, and the system will serve for a long time.

Features of Baxi chimneys for boilers

Baxi is one of the most famous companies in the production of heating systems. It manufactures chimneys from high quality polypropylene.

The coaxial chimney for the Baxi gas boiler has such characteristics as: reliability and lightness. They are manufactured by the manufacturer in two types of diameters: 100/60 mm and 125/80, while the size of the chimney protrusion is 350 mm. This type is suitable not only for the southern, but also for the northern regions of Russia. They prevent the formation of internal frost at low temperatures. temperature conditions. Baxi chimneys have an elongated head and protection design, which allows them to work without interruption at fifty degrees below zero Celsius.

Video: tips for installing a coaxial chimney

Coaxial chimneys are a new step in the creation of modern heating systems for private houses. They are environmentally friendly, safe and comfortable, and easy to install. When choosing, it should be borne in mind that some of them are not designed to work at low temperatures, so residents of the northern regions are best to pay attention to heating system by Baxi. Providing heat at home with the advent of such a system will become easier.

The coaxial chimney for the gas boiler is new technical solution, which has replaced standard options. It is used for heat generators with a closed combustion chamber of boilers). main feature and the great advantage of this chimney is that the combustion air enters the boiler furnace not from the house, but from the street.

purpose

Coaxial is designed to perform 2 functions at once:

• removal of combustion products to the outside;
• ensure the flow fresh air necessary to maintain the gas combustion process in the chamber.

Boilers with a closed combustion chamber, as a rule, are equipped with a chimney, the length of which is usually not more than 2 m. It should be noted that most often the chimney is installed outside through the wall. Less common is the option when it is taken out through the ceiling and roof.

If the place in the wall where the chimney is supposed to be led is located near the window, then it is best to place it just above the roof. However, in this case it is necessary to mount the vertical part of the chimney.

Coaxial chimneys are installed in vertical and horizontal positions. They differ only in the way they are installed, but the principle of their operation is the same.

Components

A coaxial chimney for a gas boiler consists of the following components:

• several straight pipes;
• tees;
• cleaning;
• condensate collector;
• upper tip of the chimney;
• knee (angle 90).

A chimney is formed from straight pipes. The purpose of the elbow is to connect a horizontal chimney with its vertical part, as well as a gas boiler.

If the chimney is located only in a horizontal position, the kit includes the following items:

• straight pipes;
• knee (angle 90);
• chimney tip (side).

Coaxial chimney for a gas boiler, like everyone else engineering systems, has its pros and cons.

Advantages of a coaxial chimney: customer reviews

• Oxygen to support the combustion process comes from outside, and not from the room. This is the main advantage of a coaxial chimney. Its design includes two pipes, one of which performs the function of an external, and the other an internal shell. Through a pipe with a smaller diameter, combustion products are removed - exhaust gases, and air is supplied through the outer pipe to the combustion chamber of the boiler to support combustion.
• The design takes up little space, which can significantly save space indoors.
• The chimney heats the incoming outside air with exhaust gases, which significantly increases the efficiency of the boiler.
• The system is fireproof. When exhausted, the flue gases are cooled by the air entering the combustion chamber of the heating unit, which reduces the risk of a possible fire. It is not necessary to additionally insulate the chimney with flame-retardant materials.
• Ease of installation.

A similar chimney system can be installed on the following types of boilers:

• on gas;
• solid fuel;
• on liquid fuel.

Disadvantages of coaxial chimneys

Freezing. According to user reviews, this is the most important and serious drawback. installed chimney. His first models that appeared on the markets were not designed for low temperatures operation (-15 - -30 °C), which can cause freezing of the structure and failure of the heat unit. A coaxial chimney for a gas boiler (photo presented in the article) was intended for countries with a milder climate.

But not all experts are so categorical. In their opinion, the main reason for the freezing of such a chimney is an incorrect thermal calculation. If the chimney is properly selected, it will not freeze over.

When installing a vertical coaxial chimney, there is a problem of collecting condensate. Since this drawback is known to manufacturers, certain models are equipped with a condensate trap.

Carrying out installation work

At self-fulfillment installation of a coaxial chimney, be sure to read the attached manufacturer's instructions and follow all the recommendations:

• During installation, only those materials and components that have been tested by the state gas supervision should be used; it is strictly forbidden to make any changes to the design and configuration of the chimney.
• When carrying out work, the use of materials that do not belong to the manufacturer of the chimney is strictly prohibited. All necessary additional components should be purchased only in a special service center.
• All parts of the chimney are connected and tested for flue gas leaks.
• It is forbidden to use sealants and adhesives.
• Docking of pipes in the thickness of the wall is prohibited. The junction should be provided outside of it.
• The installation of a horizontal coaxial chimney is carried out (unless otherwise specified by the boiler manufacturer): for condensing units 2-3 ° towards it, for the classic version 2-3 ° away from it, to remove condensate and prevent precipitation from entering the boiler.
• The length of this chimney depends on the model of the heating boiler, the complexity of the chimney line.
• It is forbidden to carry out the chimney exit equipment below ground level into the window pit of the semi-basement building.
• It is important to remember that during the operation of the chimney, all responsibility for breakage and possible failure rests with the installer.

Mounting sequence

The chimney is attached to the boiler and taken outside the room. All unnecessary and flammable items are best removed before work.

Installation of a coaxial chimney of a gas boiler begins with the choice of a place for a thermal unit and a chimney. Gas boiler and it is better to install together. Most best option when the chimney is located 1-1.5 m above the boiler. If necessary, the chimney can be extended, but taking into account that there are no more than 2 knees, and their total height does not exceed 3 m.

Now you can start drilling holes of the desired diameter (within 11 - 12.5 cm).

The next stage of work is the assembly of the chimney of the required configuration. Clamps are used for all connections. The chimney that leaves the room must have a slight slope to remove moisture (condensate).

This is over. It remains only for aesthetics to put on decorative overlays.

How to make a choice?

When choosing, first of all, you should pay attention to the recommendations provided by the boiler manufacturer. In some cases service centers do not accept equipment for warranty due to the installation of a coaxial chimney that is not recommended for this boiler.

The function of a coaxial chimney is to ensure not only the removal of flue gases, but also the intake of oxygen from the outside, for this reason, the reliability of its operation is very important. We offer to consider proven foreign brands: Baxi, Vaillant, Viessmann, Navien.

Coaxial chimney Baxi

It is made of high strength polymer material. The standard kit includes a chimney pipe with a length of 1 m, a 90 ° elbow, a wind protection nozzle, and decorative rings. If necessary, you can purchase an extension cord. It should be borne in mind that the coaxial chimney for the Baxi gas boiler, whose length is up to 1 m, requires the installation of a narrowing diaphragm on the boiler air duct. This is necessary to compensate for the draft, since the boiler fan power is designed for a certain length of the chimney (5 m). If the diaphragm is missing, an excess amount of air will enter the combustion chamber, due to which the efficiency of the boiler will decrease. To avoid freezing, coaxial pipe set so that its protrusion from the wall is no more than the length of the tip. When exceeds right size, in this case with inside the excess is cut off.

Chimney coaxial Vaillant

The coaxial chimney for the Vaillant gas boiler is included in the heating unit kit of this company. Compliance with the dimensions of the nozzles is the key to successful and long-term operation boiler. In addition, such chimneys can be purchased separately for boilers from other manufacturers.

Chimney coaxial Navien

The coaxial chimney for the Navien gas boiler from the Korean company has proven itself in the heating equipment market. It is available for both wall-mounted and floor-standing boilers with a power of up to 75 kW. The price of the coaxial chimney "Navien" is lower than that of European competitors, but the quality of workmanship, judging by the reviews, is not inferior to them at all.

Viessmann coaxial chimney for gas boiler

Its advantages:

• Natural heating of the sucked-in oxygen in the winter period of time.
• The cost of a chimney and its installation is much cheaper than other types.
• It takes less time to install the chimney.