Allowable length of coaxial pipe wilant. Choosing a two-channel coaxial chimney for a gas boiler, installation tips

The German company Vaillant, which specializes in the production of autonomous heating systems, has always been one step ahead of its competitors, offering consumers the latest technological solutions. She managed to achieve incredible success in various niches of the household heating equipment market, including in such a specific area as the production of exhaust gas removal systems.

Today, Vaillant, being one of the industry leaders, is actively developing the direction of coaxial chimneys - a new global trend. In this article, we will take a closer look at one of the latest developments of German engineers - the Vaillant 60x100 coaxial chimney, which is designed for units with a closed combustion chamber.

The design is made in the classic "pipe-in-pipe" format, which provides an effective intake of fresh air and rapid removal of exhaust gases. The coaxial chimney Vilant provides complete isolation of the air supply to the furnace and smoke removal. The installation of such a chimney not only helps to maintain the optimal level of humidity and the amount of oxygen in the room, but also increases the efficiency of the boiler by several percent.

The principle of operation of the Vaillant chimney with all the perfection of the design is quite simple. The forced draft burner, which is located in the boiler, throws exhaust gases outside through the inner pipe, and fresh air is sucked in from the combustion chamber through the outer pipe of a larger diameter.

This design is compact and easy to use and install. The Vaillant smoke extraction system cannot be compared to a traditional chimney. A coaxial pipe can be installed in absolutely any room, and quite quickly. To install a chimney in an apartment, you need to make a small hole in the wall for the unimpeded removal of gases.

The versatility of the German coaxial chimney Vaillant is noted by many experts. It can be installed on either the right or left side of the boiler.

What is included in the mounting kit? It includes:

Elbow 90 degrees with a flange for aggregation with a boiler and specially provided holes that make it possible to take a sample of combustion products;
750 mm coaxial chimney section;
Cuffs for decoration of the inter-wall passage;
Mounting kit for installing screws, gaskets and clamps.

The Vaillant coaxial flue is used for horizontal exhaust gas discharge and rapid air flow into the combustion chamber. The total length of the structure is 1 meter.

Outcome

If you do not have the opportunity to equip a full-fledged exhaust system, this does not mean that your only choice is an electric water heating boiler. Today, the installation of a gas or solid fuel boiler, requiring additional installation of a gas exhaust system, is possible in any room. The coaxial Vilant design, which has proven itself among European consumers, will help you in solving this issue.

Updated:

2016-08-15

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 for solving the task at hand in private houses. This boiler fume extraction device is an effective replacement for the aging traditional pipes.

The device of a coaxial chimney (hereinafter referred to as CD) assumes a construction of a pair of pipes arranged according to the principle of a nesting doll. The pipe contours are connected with jumpers. The design itself is designed to work with closed-type heat generators. An example of this is a gas water heater. The inner pipe provides the removal of combustion products, while the outer one 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 the well-known 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, CD is taken out into the street through a hole in the wall. Much less common is a vertical coaxial chimney opening onto the roof.

In addition, there are a number of problems that the installation of a coaxial chimney successfully solves:

the compactness of the device saves 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 losses (due to the heating of the air entering through the outer pipe with hot smoke in the inner pipe);
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 excludes the possibility of carbon monoxide poisoning of residents, whether it is systems from Baxi or from other manufacturers.

How does the installation of coaxial chimneys begin?

Before installing a coaxial chimney, you first need to select the type of system - vertical or horizontal (incl. Inclined). The price here is about the same, but it should be noted that the latter option requires the installation of forced ventilation with a device. In addition, the horizontal section of the instrument should not exceed 3 m in length. A vertical CD is recommended if smoke will enter adjacent windows or a narrow street. Always follow the diagram and instructions from the manufacturer (Baxi, Ochag, etc.) for a specific system, where installation rules are detailed.

For example, the ratio of the boiler size to the diameter of the outlet pipe is important, 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 attached by a specialist. It is better not to perform operations on installing CD with your own hands, without having experience in installing a coaxial chimney. It is easier to mount a vertical CD, the main thing is to stock up on brackets. The coaxial pipes themselves are connected into the system using a special transition unit. At the joint section, clamps are used that securely fasten the elements.

Chimney outlet and finishing work

The price of success is accuracy of installation. When removing the branch pipe on the side of the heating device, there must 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 get dirty. The angle of inclination of the outlet pipe is set from 3 degrees. This will prevent condensate from flowing back into the boiler. From the window, the opening of the branch pipe should be 60 cm or more, and from the 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 branch pipe must be insulated with non-combustible materials.

If the branch pipe is brought out to the roof vertically, fire safety requirements must be taken into account. Use fireproof insulation, insulating pipes and special protective covers for the flue duct. The pipe and the ceiling must be separated by an air gap. The outlet itself must be covered with a special apron that insulates the joint.

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

Conclusion

To feel the desired coziness 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 hand, but if you have reasonable doubts about your ability, it is better to hire an experienced specialist.

Coaxial chimney is a new technical solution that replaces standard chimneys. The peculiarity and great advantage of this apparatus is that oxygen for combustion in the boiler furnace is taken from the street, and not from the house.

Coaxial chimney designs

Chimneys are used for different types of boilers:

B - chimneys for boilers with an open combustion chamber;
C - chimneys for boilers with a closed combustion chamber.

In high-rise buildings, you can find a variant of a collective chimney, to which individual boilers are connected. Such a chimney goes to the roof

Coaxial chimneys are mounted in two positions:

vertical;

horizontal.

Only the installation method differs, but the principle of the chimney is the same. Like all engineering systems, it has both advantages and disadvantages. Let's consider them.

Benefits

Structurally, the chimney consists of two pipes, one plays the role of an outer shell, the other inner. Combustion products - exhaust gases - are discharged through a pipe with a smaller diameter. Air enters the combustion chamber of the boiler through the outer pipe to maintain combustion. Such a system provides a compact and aesthetic appearance and takes up little space. The system provides heating of the incoming outside air with exhaust gases, which increases the efficiency of the boiler.

Another important advantage of this system is its fire safety. When flue gases are removed, they are cooled by air, which enters the combustion chamber of the heating unit, reducing the risk of fire to zero. Additional insulation of the chimney with fire resistant materials is not required.

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

on gas;
on liquid fuel;
solid fuel.

Disadvantages of a coaxial chimney

Freezing. This is probably the main and most serious drawback when installing a horizontal chimney.

The first models of coaxial chimneys that appeared on the Russian market were not designed for such low operating temperatures - -15 - -30 ° С. They are designed for countries with milder climates. As a result - the possibility of freezing of the chimney and failure of the heating unit.

Although not all experts are so categorical. In their opinion, the main reason for the freezing of the coaxial chimney is the incorrect heat engineering calculation. In this case, the boiler efficiency depends on the supply air temperature. In pursuit of increased efficiency, the designers reduced the diameter of the exhaust pipe. In this case, the temperature of the flue gases drops below the dew point, which leads to an increase in the formed condensation inside the exhaust pipe and freezing. To reduce the effect of this factor, it is necessary to increase the temperature of the flue gases by increasing the pipe diameter. A properly sized coaxial chimney must not freeze up.

When installing a vertical coaxial chimney, we face the problem of collecting condensate. Since the problem is known to all manufacturers, the models of coaxial chimneys intended for vertical installation are equipped with a condensate trap.

Rules for installing a coaxial chimney for a gas boiler

When installing a coaxial chimney yourself, you must read the manufacturer's instructions. Be sure to adhere to the rules for installing a coaxial chimney.

When installing, use only materials and components that have been tested in the state gas supervision; it is forbidden to make any changes to the configuration and construction of the chimney.
During installation, it is prohibited to use materials not manufactured by the manufacturer of the chimney; the necessary additional components can be purchased only at service centers.
All parts of the chimney are firmly connected and tested for flue gas leaks.
The use of sealants and adhesives is prohibited.
It is forbidden to join pipes in the thickness of the wall, it is necessary to provide a joint outside of it.
A horizontal coaxial chimney is installed (unless otherwise specified by the manufacturer of the boiler): for condensing boilers 2-3 ° towards the boiler, for classic 2-3 ° outwards, ensuring the drainage of condensate and no precipitation entering the boiler.
The length of the coaxial chimney depends on the boiler model, the complexity of the chimney route and ranges from 1 to 7 m (maximum length for a straight-line installation for a boiler with an installed turbine, with a capacity of more than 30 kW.).
It is forbidden to equip the outlet of the coaxial chimney below ground level into the window pit of the semi-basement room.
Remember, for breakdowns and accidents during the operation of the chimney, the installer is responsible.

Installation diagram of a coaxial chimney

The exit of the coaxial chimney through the enclosing structures must comply with a number of rules and requirements. Since boilers of type C are with a closed combustion chamber, they can be installed in all types of premises. Regardless of the presence of windows of the ventilation system and the volume of the room itself, several norms must be adhered to. The photo shows the requirements for installing a coaxial chimney in different versions:

a - the minimum distance from the axis of the chimney to any opening element of the facade of the house;
b is the minimum distance from the axis of the chimney to any air intake;
c - the minimum distance to the sidewalks (to reduce the distance, a grill with a deflector is installed, in this case the distance will be 0.15 m);
d is the minimum distance from the ground;
e - the minimum distance from the axis of the chimney to the wall at an angle of 90 ° with opening elements or air intake holes; (0.15 m with a deflector);
f - the minimum distance from the axis of the chimney to the wall at an angle of 90 ° without opening elements;
g is the minimum distance to green spaces;
h is the minimum distance to the gutter system or vertical pipeline.

Choosing a coaxial chimney

When choosing a coaxial chimney, first of all, you need to pay attention to the recommendations of the boiler manufacturer. There have been cases when the service center did not accept the equipment for warranty through the installation of a coaxial chimney that was not recommended for this boiler.

The coaxial chimney must ensure not only the outlet of flue gases, but also completely ensure the intake of oxygen from the street, therefore, its reliability is very important. It is worth choosing from trusted foreign brands: Baxi, Vaillant, Navien, Ferroli, Ariston, Viessmann.

Coaxial chimney Baxi

Chimneys are made of stainless steel and high-strength polymeric materials. The standard kit includes a 1 meter flue pipe, 90 ° elbow, wind protection nozzle, decorative rings. If you need to use an extension cord, purchase it separately. It should be noted that for a chimney with a length of up to 1 m, a narrowing diaphragm must be installed on the boiler air duct. The procedure is carried out to compensate for the draft, since the boiler fan is designed for the maximum chimney length (5m), and in the absence of a diaphragm, a large amount of air will enter the combustion chamber, which will lead to a decrease in the boiler efficiency. To protect against freezing, the coaxial pipe should protrude from the wall for the length of the tip, no more. If the length of the pipe is longer than necessary, the excess is cut off from the inside.

Photos of the main Baxi coaxial chimneys:

Chimney coaxial Vaillant

The Vaillant company equips boilers of its own production with coaxial chimneys. Compliance with the dimensions of the nozzles is the key to the successful operation of the boiler. Also, Vilent coaxial chimneys can be purchased for boilers from other manufacturers.

Coaxial chimney Navien

Smoke removal systems Navien from a Korean company have proven themselves well in the heating equipment market. Chimneys are produced for wall and floor boilers up to 75 kW. The cost of Navien coaxial chimneys is slightly lower than its European competitors, while the quality of performance is not inferior to them.

23 May 2014 Alexei

The use of modern boiler equipment is impossible without a combustion product removal system. It is necessary for the efficient operation of the boiler using any type of fuel.

But the installation of a classic smoke channel is carried out during the construction of a house and is impossible in an already constructed building. In this case, a coaxial chimney device would be an ideal solution. In this article we will look at what this structure is and how to install it.

Purpose and types of coaxial systems

Let's start with the name. The word coaxial is interpreted as a double channel. In constructive terms, such a chimney is double-circuit. In it, a smaller pipe is located in a larger one. Moreover, they do not touch each other, but are connected into one whole with the help of special jumpers.

In general, this is a system that carries out the removal of combustion products and air supply from the street for the most complete combustion of fuel inside the boiler. About 90% of modern heating units are equipped with a closed combustion chamber, with a smoke exhaust pipe within 3 m in length.

When deciding to use a coaxial chimney, it is important to know that it is installed in a horizontal position. The outlet is carried out through one of the outer walls.

The following are presented on the market:

And from stainless steel
Galvanized

Depending on the installation method, they are divided into:

Internal
External

Having decided to equip a coaxial chimney, the installation standards must be studied in advance, this will help to perform all the work correctly and guarantee trouble-free operation of the equipment in the future.

Installation rules

No matter how simple the chimney design is, its installation must be carried out in accordance with the requirements of regulatory documents. When installing coaxial chimneys, you must adhere to the following rules:

The outlet is made 1.5 m above the gas boiler and at least 1 m above ground level
If it is necessary to extend the pipe, its length should not exceed 3 m, while the use of sealants and other similar materials is prohibited
Horizontal installation is performed with a tilt angle of 3 degrees
It is forbidden to use more than 2 knees
A distance of 60 cm is allowed between the chimney and the nearest opening in the wall.

Only by fulfilling all the above requirements can you be sure of the high-quality operation of the system.

Benefits of using

Why do most consumers choose such designs today? The answer to this question can be her positive qualities. The main advantage of a coaxial chimney is the possibility of air intake from the outside.

This allows you to maintain a good microclimate in the room without additional investment in ventilation systems.

Another plus in favor of this design is the heating of air during intake, which completely eliminates heat losses and significantly increases the efficiency of the boiler. The latter factor contributes to the complete combustion of the gas, which makes the operation of the unit environmentally friendly.

We watch the video, system operation:

Design features avoid heating the outer surface of the pipe. This makes it possible to minimize the risk of ignition of cladding materials located at the junction of the pipe and the wall.

Add to this:

Wide range of diameters
Ease of installation
Compact dimensions

If you compare the capabilities of a conventional design and a coaxial one, you can once again be convinced of its superiority. The only drawbacks are the high cost and expensive maintenance.

How does the installation begin?

Installing a coaxial chimney will not take long if you draw up an action plan. Make sure in advance that the equipment of the unit corresponds to the one declared by the manufacturer and take care of purchasing the necessary tools.

The chimney section must correspond to the diameter of the boiler outlet pipe. This can be determined by the passport.

Build without errors

The first step in installing the chimney is to prepare a hole in the wall. Its diameter should correspond to the pipe that is led out.

Then connect the chimney to the outlet of the boiler using a clamp to fix it. The assembled structure is bolted on both sides. Next, proceed to the assembly of the chimney itself. Its parts are connected to each other using clamps, in order to ensure their reliability. On top of them put on decorative overlays. Their function is to preserve the design of the room.

No matter how simple the installation and the device of a coaxial chimney may seem, certain knowledge is needed to complete it. Indeed, with incorrect calculations of the combustion product removal system, smoke, carbon monoxide can enter the room.

Installation of an external chimney

Installation of such a design can be performed in two versions:

Outside
Internal

The first is used if the building has already been built. Before proceeding with the installation, determine the place for the location of the system and for the entrance of the chimney.

On the outer wall, mark where the exit will be located. When performing it, you should adhere to the fire safety rules. After the hole of the required diameter is ready, proceed to the installation of the chimney.

For this, all internal work is preliminarily carried out: connecting the pipe to the boiler using a sectional single-circuit elbow and a double-circuit tee. The latter is necessary to secure the system in an upright position. Further, the chimney is reinforced with brackets on the wall surface.

The installation of the internal system begins with the correct selection of the pipe diameter. Usually its diameter is indicated in the product passport. The main thing is that it matches the size of the boiler outlet.

The connection between the unit and the chimney is performed using a tee. In this case, the links are fastened with a chain (the lower ones should go into the upper ones). This design allows smoke to escape unhindered.

Double-circuit pipes are connected using a transition unit. The joints are fastened using clamps.

If the branch pipe is located on the side of the boiler, then horizontal assembly is carried out for the outlet of the chimney. When the exit is from above, the chimney is brought out in a vertical position using brackets.

Checking the performance of the structure

After all the installation steps have been successfully completed, you must check:

Reliability of fastening of the chimney connecting parts
Correct location of the flue pipe (it should be slightly inclined)
No obstacles at the exit of the structure outside

Only after making sure that the equipment is installed correctly, the hole in the wall is closed with decorative overlays. They are fastened to construction glue or liquid nails. It is recommended to foam the hole around the chimney, this will avoid cold air entering the room and condensation accumulation.

It is important

The coaxial exhaust gas system is a design that not only improves the characteristics of heating boilers, but also increases their efficiency.

Its installation can be done independently, with the necessary skills and knowledge. If you are not confident in your own abilities, then it is better to entrust this work to professionals.

After all, competent installation of a condensate drain can only be done by a specialist. Therefore, it is not worth the risk.

Coziness and comfort in the house creates warmth. And nowadays there are many ways to heat your home. 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 quarters. The standard pipes are replaced by more advanced and compact ones.

The coaxial chimney is an innovative system with an increased level of safety. 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 structure, installation standards.

What is a coaxial chimney?

Many owners of heating boilers are asking this question. A coaxial chimney is a structure that is assembled according to the principle of "pipe in pipe" and is used in heat heaters such as: gas boilers, convectors, radiators with buried combustion chambers. The uniqueness of such chimney channels is that this structure is assembled from several parts, which are inserted into each other and held due to the fact that there are specialized jumpers inside this device. They prevent parts from touching and sliding off.

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

increased safety during the operation of the chimney 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 removal of the burning out;
the efficiency of heating devices increases due to warming of cold air streams against a heated exhaust pipe;
good efficiency increases the degree of environmental friendliness of heat generators and improves the afterburning of gas fuel;
the whole work process is carried out outside the room, which increases the comfort in it when heating with a gas boiler;

Read also about on our portal.

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 fire resistance and high quality steel. Especially these qualities are known for the coaxial chimney for the baxi gas boiler;
they have a special drain for condensation;
the risk of fire is reduced to zero, as due to constant circulation, the air temperature in the chimney is reduced to a safe temperature.

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

Advice! They are great for houses, as they provide comfort and safety to the owners of even wooden houses due to their construction.

For the modern 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 that are suitable for this purpose, so it is important not to make the wrong choice. To do this, you need to take into account the specific conditions and comply with the established requirements.

Types of coaxial chimneys

They are divided into two types: insulated and non-insulated. The first of them is most adapted to winter conditions and is successfully applied throughout Russia.

They are classified into three types of installation:

vertical coaxial chimney. It 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 engaging in the design of the structure, it is necessary to study the characteristics of the installed device;
inclined coaxial chimney. This is the rarest installation option and should be used only when the other two options cannot be used.

The chimney direction is individual for each boiler.

Installation Requirements

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

you should carefully prepare for the installation work. First you need to choose the correct 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 indicated, then you should be guided by the generally accepted framework. In the best case, the length of the chimney should 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 installation of the flue duct is improperly made, leakage or smoke supply into the heated room may occur;
with the correct installation of the chimney, the outlet duct must be larger in diameter than the outlet from the boiler;

Advice! Before installation, it is necessary to check the data with the technical data sheet for the flue duct in the field - diameter. This will help you avoid mistakes.

the device for heating must be installed one and a half meters lower than the outlet of the flue duct, while the pipe entry must have an angle of at least three degrees. This arrangement allows the condensate to drain freely.
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 a false chimney system is being installed, it should not be more than three meters long. This will allow the smoke to enter freely outside.

Required fasteners

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

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

With the right choice of elements, installation will not take much time, and the system will serve for a long time.

Features of Baxi chimneys for boilers

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

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 millimeters and 125/80, while the size of the chimney protrusion is 350 millimeters. This type is suitable not only for the southern, but also for the northern regions of Russia. They prevent the appearance of internal ice at low temperatures. Baxi chimneys have an elongated head and a protective structure, which allows them to work without interruption at fifty degrees 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, therefore, residents of the northern regions are best off paying attention to the heating system from Baxi. Providing a home with heat with the advent of such a system will become easier.