In the modern world, the coaxial chimney for the gas boiler began to be very popular. With the proper installation, such a pipe performs two important functions at once: displays the combustion products and ensures the necessary air flow to operate the heating system. There are several types of chimneys that differ in design, material and technical properties.

These designs differ in some characteristics.

Basic characteristic

In order for the system of heating, in which the open flame burning, it works, it is necessary to follow two rules: a regular air flow is needed in sufficient sizes, and a safe output of combustion products and spent gases should be adjusted.

If in the private sector it is possible to use a chimney, then in the conditions of an urban apartment, it will be very difficult to implement this option. However, in both cases, this method will have a lot of significant minuses:

1. For flame burning, a significant air flow is needed, which will be borrowed from residential space. This contributes to the occurrence of drafts, and also increases the arrival of cool air from the street.
2. Chimneys installed in private homes are most often performed in the form of brick blocks with vertical or horizontal channels for smoke. Gas boilers are categorically forbidden to connect them to such chimneys.
3. In order to make a separate chimney with removal in the apartment, a lot of money will be required. This is a difficult task, since, in addition to large financial costs for installation and manufacture, it will take permission from the executive authorities that are responsible for the visual component of the city.

In this video you will learn how to modify the coaxy chimney:

In view of these factors, the installation of coaxial chimneys for boilers is considered the most rational. In addition, this is an economical option that does not require huge funds for the purchase and installation.

Appearance and principle of work

The design of such a chimney consists of one long metal pipe located inside another, shorter, but possessing the largest diameter. In addition, there are various connecting accessories in the set - the knees, clamps, lining, and also receiver to collect condensate.

The varieties of such equipment may have minor differences, however, the device diagram and the principle of operation are almost identical to all systems:

1. Thin inner tube is necessary for the output of combustion products. It is made of high quality and reliable stainless steel. The inner end is connected to the opening at the outlet of the boiler, and the outdoor is outlined outside the residential premises.
2. The outer tube is responsible for the influx of air from the environment in the burning area. Its inner end joins the opening at the entrance, and the outer is excreted from the residential zone.
3. Waste waste due to thrust is discharged into the atmosphere on the inner tube, and clean air along the outer tube enters the burning area.
4. The outer tube does not in contact with the hot gases directly, however it is in the region of a strong temperature difference. This item can be made of cheaper steel.

Varieties of chimneys

On how the burning products will be made, it affects the type of gas boiler, as well as the layout of the room that will be heated. This process can occur in two ways: through the outer area of \u200b\u200bthe building in the side or through the ceiling overlap and the roof of the private house. Therefore, coaxial chimneys for gas boilers are divided into two types: vertical and horizontal.

Vertical coaxial chimney for a gas boiler is operated only in the private sector. It is designed to remove the waste elements through the ceiling overlap. This method is more sparing in an environmental plan and allows you to achieve a full-fledged heat exchange between the incoming and outgoing air. The placement of the mouth of the pipe affects the formation of good thrust.

With the vertical placement of the pipe in its lower area, it is necessary to install a special receiver for collecting condensate. The vertical variety of chimney has a higher cost, since more labor-intensive in the installation, more material is consumed to create it.

The horizontal type is the only available option for boiler equipment that can be connected in an urban apartment. Such a removal can be equipped independently, since this will require a minimum of materials. Installation is also simple, the device for collecting condensate will not need to be installed. Water can flow into the street naturally due to the negative tilt of the chimney.

The horizontal option is one of the optimal for the corresponding boilers.

Advantages and disadvantages

The coaxial system has many advantages compared to other varieties of chimneys. You can highlight such advantages:

1. Clean air, which is needed for burning flame, moves from the street along a closed equipment system. To operate the device, air from heated space is not used.
2. This scheme does not allow carbon monoxide or natural gas to enter the premises. There will be no drafts in the house, the operation of the system will not affect humidity and air temperature.
3. Coaxial chimney increases the productivity of the gas boiler, the consumption of natural gas will be economical, and the amount of substances allocated to the environment will decrease.
4. The smoke canal is reliably protected by the air layer, so there is no open contact with the surrounding structures and objects.
5. In terms of competent installation and operation, the possibilities of ignition or receiving burns are excluded.
6. The acquisition and installation of a coaxial pipe will require much less financial costs than buying and arrangeing another kind of chimney.

Such a system has only one disadvantage - the freezing of condensate on the surface of the outer pipe into severe cold. However, this is an absolutely solved problem. The end of the chimney can be insulated with basal or mineral wool.

Some masters are confident that the condensate freezing can be avoided if you shorten the pipe. Professionals do not recommend changing the design with their own hands. Manufacturers have developed a model with a glider against ice formation. It can be used to prevent freezing.

Air flow into this pipe occurs through its holes in the lower area. This invention is designed to work even in conditions of harsh frosts. The device has a nozzle for the inner tube, inside which is placed a special spiral. Holes to obtain air along the edge of the pipe at the same time are distributed from below.

FEATURES OF MONTAGE

The horizontal type of chimney is easy enough to install, besides it takes much less space. To obtain the highest quality work, it is necessary to follow a number of requirements:

1. The outer tube must be 2 meters from the ground.
2. Distance from pipe to doors, windows, ventilation channels, etc. Vertical and horizontal should be at least 0.5 meters.
3. If a window is present above the ventilation hole, the distance to its lower domain should be at least a meter.
4. Under the coaxial pipe must be free space of at least 1.5 meters. At this distance there should be no obstacles, pillars, walls and fences.
5. If there is no receiver for collecting condensate, then the pipe must be placed with a slope to the ground. Its angle should be from 3 ° to 12 °.
6. It is forbidden to remove the channel to any other space except the street.
7. If the gas pipes and the details of the chimney take place nearby, you should withstand between them a distance of 20 cm.

The chimney tube can be placed under a canopy or balcony. The closer to the balcony there is a chimney hole, the more the length of the exterior of the pipe should be. It is believed that with a horizontal installation scheme, the smoke length should not be more than 3 meters. It is not always true. Some varieties of equipment have a length of 4-5 meters.

To make the installation of the coaxial chimney with their own hands, you need to stock the necessary materials. The list of tools may differ depending on the situation, but most often such devices are required:

• pipes themselves;
• adapter connecting chimney and boiler;
• tee, knee;
• crimp clamps for efficient fixation of parts.

Most often, all equipment for mounting is supplied with chimney. To spend the pipe through the roof, wall or overlap, you should use fire-resistant gaskets. They are required to protect from ignition and overheating materials near the chimney.

Installation and operation

Installation and proper connection of the system to the boiler is a simple process. To set the horizontal chimney, you need to follow the phased instructions:

1. First you need to place the gas boiler in your place, and on the wall of the building outside the center of the intended pipe outlet.
2. Now the boiler should be temporarily removed and with a perforator and cutting crowns drown a hole in the bearing wall. Its diameter should be greater than the size of the outer tube by 20 mm.
3. The adapter must be connected to the opening of the boiler at the output. When connected, use the sealing gasket. After that, with the help of self-screws or screws, you should attach the adapter flange to the surface of the boiler.
4. The pipe must be connected to the outer nozzle of the adapter. To create reliable fixation it is impossible to use any sealants.
5. Be sure to check the tightness of the compounds and fixing the fasteners. If everything is done correctly, the pipe will be cut into the hole in the wall.
6. Now the boiler can be returned to its former place and secure on the wall. The smoke tube needs to be installed with a slope of 3-5 degrees towards the street. It should be fixed in the wall with small pebbles.
7. The soles between the outer casing and the wall should be chopped by polyurethane sealant.

Quality ventilation

Although the spent substances overlook the hermetic channel, and the air intake occurs outside, you need to take care of good ventilation of the room in which the boiler is placed. This will allow to maintain the ideal indicators of humidity in the room, which will have a positive effect on the work of the equipment and will prolong its service life.

Whatever quality system, it can fail after a while. If a small breakdown occurs in the boiler room, in high-quality ventilation, the carbon black gas will be out of natural way. In this case, the risk of gas poisoning is significantly reduced.

Coaxial chimney is a reliable, efficient and easy equipment. In order for the system to work efficiently, it is necessary to comply with the requirements for installation and follow the instruction manual.

The modern autonomous heating system consists of a variety of elements. Its composition may vary depending on the type of coolant or from the method of its heating. When heating the coolant in pipeline systems or in heat exchanger with open fire, heating furnaces operating on different types of fuel can be used. Regardless of the combustion material, the heating boiler must include a combustion product challenge system, or chimney. This design can also be built in different ways. So, if there is a gas heating system with good elections, there will be a coaxial chimney, for gas boilers they happen:

1. wall (vertical);
2. horizontal (cutting through the wall).

The very concept of "coaxial" provides for the premises of one cylinder inside another cylinder. Thus, the coaxial chimney system for gas boilers is one pipe, which is placed inside another pipe. Thus, the system will have two contours created from a pipe larger and smaller diameters. So that the distance between the large and small pipe remains the same - they are fixed by jumpers, which prevent contact of the walls of the pipelines.

Appointment of coaxial chimney system

The main area of \u200b\u200buse of coaxial chimneys is heating systems with gas heating boilers equipped with closed fireboxes for fuel combustion. It can be represented by a gas boiler, convector or radiator. Two contours of the coaxial chimney perform different functions:

• The first contour is responsible for the removal of gas combustion products from the boiler firebox.
• The second outline is responsible for the inflow in the furnace of fresh air required for efficient burning.

In order to ensure efficient traction and uniform combustion of gas - boilers with closed fuel chambers must be equipped with coaxial smoking systems not exceeding 2 meters. Otherwise, during the pipe there are twists, which will prevent the free conclusion of combustion products and the flow of fresh air.

Rules for the placement of coaxial chimney systems

A small length of coaxial chimney systems dictates a strict framework of their placement. The most frequent installation method is direct passage through the wall to the street. More rarely, when installed, there is a passage of coaxial chimney systems through overlap or through the roof. The most efficient coaxial chimney pipeline works if it has a strictly horizontal location. In the event that the gas heating boiler is located in an uncomfortable place for such an output - it can be concluded through the roof using the vertical areas of the structure.

Composition of the coaxial chimney

The standard design of the coaxial chimney for gas boilers consists of the following main parts:

Straight pipes - from them the channel of the chimney system is formed

Connecting elements (tee or rotary portion) are designed to connect direct portion and connecting the chimney directly to the gas boiler. Plot of clearing, intended for regular regulations,

Place for collecting water condensate - Gas combustion products carry water vapor, which as cooling can accumulate on the walls. To prevent its combustion into the combustion chamber and such a plot is formed.

The upper external portion of the chimney is designed to protect the inner contours of the chimney coaxial smoke system from the effects of atmospheric conditions: snow or rain, as well as to protect against wind.

What materials most often make coaxial chimits?

Industrial production of elements of coaxial chimneys for gas heating boilers is carried out from many materials:

Pipes made of stainless steel. This is perhaps the longest material, but such equipment has an increased price.

Galvanized steel pipes - such devices are sold cheaper, but they are more corrosion.

In addition, various parts of the chimney, as well as the outer and internal pipelines can be made of a variety of materials, up to high-strength polymers.

What gives the installation of a coaxial chimney?

The most important advantage of placing a coaxial chimney for a gas heating boiler is the fact that the fence of fresh air for constant maintenance of combustion in the furnace occurs outside the room. In this case, you will not experience discomfort due to the burning of oxygen in the room, will not come across an excessive dry air. The use of coaxial chimneys will avoid the frequent ventilation of the room in which the gas boiler is located. This is especially important in cold weather, because when carrying out through the windows, you cool the air in the rooms, and for reverse heating, the increased consumption of coolants and energy is required.

In addition, the air coming along the contour of the coaxial chimney when moving from the street in the combustion furnace heats up, which facilitates the burning reaction and increases the efficiency of your gas boiler. With a constant influx of fresh air heated to room temperature - the gas in the furnace of your boiler is completely burned, significantly increasing the efficiency of the entire heating system.

It is worth noting that the full combustion of fuel increases both the ecology of the heating system - you do not pollute the ambient air by unburned elements.

Also, combustion products during the passage of the emission contour give part of their heat incoming from the outside of fresh air. This reduces the risk of ignitions inside the pipe in areas with the accumulation of unburned particles. The coaxial tube has a temperature of the outer surface is significantly lower than the classic chimney, which reduces the fire requirements for its installation. Thus, coaxial pipes (with the appropriate isolation, of course), it is possible to carry out wooden walls or overlaps, which is impossible for a conventional steel chimney. The gas heating system with a coaxial chimney creates a completely closed contour of the combustion of fuel, in which oxygen for constant burning is closed from outdoor air and combustion products are displayed. It creates a comfortable atmosphere in the room where the gas heating boiler is located. This is important, since gas water heating boilers are often placed in inhabited rooms, for example, in the kitchens.

A wide range of

The selection of the coaxial chimney is possible for almost any gas heating system, regardless of its power: there are pipes of the most different diameter, performed from a variety of materials. Installation of such a system relatively simple and can be easily made even an unprepared specialist.

Installation of coaxial chimney

Note that the improper construction or installation of the coaxial chimney system can reduce all its advantages. For the correct installation, follow the step-by-step instructions:

1. Make sure all the necessary materials and tools are available. To do this, you need a set of coaxial pipes and connecting elements, lining on the walls for the formation of seals and the street tip.
2. Before starting to install, make a marking, calculate the path of the chimney, remove unnecessary items, make a hole in the wall of the corresponding diameter. When designing the installation, make sure that there will be no flammable items near the pipe.
3. The best choice will be the simultaneous installation of a gas heating boiler and the coaxial chimney corresponding to it.
4. The discharge point of the chimney should be located about a meter-one and a half above the level of the gas combustion chamber. To achieve an optimal arrangement, the chimney system can be extended, but the installation of more than two knees will lead to the formation of twirls with a sharp decrease in its efficiency.
5. Coaxial tube is connected to the outlet of the combustion chamber of the gas boiler with a clamp. It is fixed by two bolts.
6. After that, we collect a chimney system in accordance with the configuration designed.
7. Among the knees of the chimney are also fixed by the clamps.
8. On the weekend of the chimney, we form a small bias down, so that the condensing moisture is selected from the system.
9. The protective fluorca can be put on the upside part of the coaxial chimney.

Warm coaxial smoke

At low negative temperatures on the street, some areas of the coaxial chimney may well bleed, which adversely affects its effective work. In order to avoid negative moments - such sites must be insulated. It would seem that a reasonable solution, but the design of the "pipe in the pipe" negates any insulation. " Instead, the best output will be a decrease in the cross section of the chimney system. In the event that frost is observed on the headside of the chimney - try making the internal pipe of the system. In this case, the death of condensate can be avoided. In extreme cases, the installation of two separate steel pipes is practiced, one of which takes the air, and the other displays the combustion products.

Coaxial Chimney for Gas Boiler Video

Accommodation in country houses is impossible without arranging the heating system, and gas heating itself is considered. But also for gas, as for a different type of fuel, the influx of oxygen and the removal of combustion products is also needed. And the best chimney system is recognized as coaxial: it can simultaneously cope with the tap, and with the influx of the necessary gases.

What is coaxial chimneys

Coaxial means internally combined, or in a different one in the other. Coaxial chimney is a design of two pipes, which are reinforced with jumpers that do not allow contact with each other. Such an arrangement of the chimney system is best suited for gas heating boilers, but you can use it in other heating systems, where the combustion chamber does not have open access.

Coaxial chimney can simultaneously serve air into a closed combustion chamber, and take the resulting carbon dioxide to the street.

Device

Since this system needs not only the inflow of oxygen, but also autonomous disposal of condensate and combustion products, it consists of several components:

• Double straight pipe for removal of carbon dioxide;
• A small container for collecting condensate forms: in no case should not fall into the burning boiler;
• Connecting Triple Design is used to collect all parts;
• Bent under 90 0 knee, intended for turns of the chimney pipe;
• CLEANING SYSTEMS: With it, it is carried out repair or preventive work;
• Tip - It is designed to protect the system from atmospheric precipitation.

Pros and cons

What positive characteristics have a coaxial chimney system?

• The fence required for combustion of air takes place from the street that does not create a stuffset;
• Minimum heat loss, since air supply is conducted along the outer pipeline, and it warms up from the inner structure;
• Meets all the requirements of the ecology: the gas boiler has a large percentage of useful, and all fuel combines completely, therefore, the components harmful to nature and person are practically not thrown into the atmosphere;
• Responsible to all the requirements of fire safety: both pipes compensate for heating and cooling, and therefore even if they come into contact with flammable items, it cannot happen;
• The design compactness allows you to install in any, even a small room;
• Installation does not provide impaired integrity of the roof of the house.

There are very few minuses of such a smoke system, here you can attribute a high cost of and low aesthetic perception: if installing it in the basement, it may slightly reduce the harmony of the room.

Views

The coaxial chimney system is the horizontal and vertical species, each of them can be set under certain conditions.

Vertical.For this system, it is necessary to equip the removal on the roof of the house, and the capacitance for collecting condensate is also very necessary, but usually the entire desired set of components is already included in the chimney.

Horizontal.This is the most popular coaxy chimney system, since its installation is very simple: you need a hole in the wall and that's it. In addition, it is not necessary to equip the place for the chimney on the roof, and the collecting condensate can be diverted directly, that is, it is easy to equip an additional capacitance: it simply flows through the pipe to the street if the pipe is installed with a slight tilt.

Placing coaxial chimney systems

1. Experts recommend to determine the location of the chimney system only after installing the gas combustion boiler itself.
2. Pipes to arrange from window and doorways at a distance of at least 50 cm. To ensure the best traction, the first component of the pipe must have at least 1 meter of length. It is fixed on the place of removal of the boiler on the pipe with a metal clamp.
3. If the boiler is equipped with a natural hood, then set the knee of the chimney is above this design. If the fan is installed, the installation can be carried out at any height.
4. Then you need to equip a hole to exit pipes into the street, if the house is made of wood, then it will be necessary to install the thermal insulation layer: it will prevent the possible fire fire.
5. So that the condensate forms can leave the drainage system into the street, the pipes are mounted with a slope down.

Installation

Fire supervision authorities require to improve the heating system the presence of a separate room, which carried out ventilation and has all the necessary equipment. This leads to excess costs, you need to either rebuild the finished house, or equip a separate smoke system.

But all this can be avoided if you purchase a gas boiler of a closed type of combustion and equip a special coaxial system of chimney that save the funds of the home owner at the arrangement of a separate removal of smoke.

And for these reasons, the installation of the boiler is allowed in any suitable room, even where there is no ventilation system: in the attic, in the kitchen, in the base of the house. It is impossible to say about the boilers with an open type of combustion.

Mounting rules for compounds should be followed: They must end before the exit of the system into the wall hole. The pipe itself should come out of the wall at least 20 cm, allowed and more distance.

To ensure the impossibility of returning the reverse thrust to the boiler, it is equipped with a special valve, which will prevent this phenomenon.

The connection of all parts of the chimney is carried out using clamps and in some cases and insulation. To achieve better sealing, you can use the construction foam.

Tip: Use as little vertical parts as possible: so the efficiency of the chimney will be higher.

There are regulatory rules of self-installing coaxial chimney:

• For installation of the system, it is recommended to use only parts of the kit;
• Do not use independently manufactured parts, but to acquire missing parts only in the manufacturer's service centers;
• After installing the smoke system, it must be tested for the presence of leaks;
• The docking of the compounds is carried out in the free, and not in the wall space.

Step-by-step instruction

1. Initially, the location of the gas boiler is determined;
2. Installation of gas equipment is carried out simultaneously with the installation of the coaxial chimney system;
3. The chimney itself must be located 1.5 meters above the gas boiler itself;
4. Perform a fire safety requirement: chimney pipes to position so that between the window, the ventilation hole and the door it was at least 50 cm;
5. Take a hole for the exit pipe in the wall in accordance with the diameter;
6. Connect pipes with an outlet of the boiler with a metal clamp. Do not forget about the bias to land for condensate;
7. After installing the pipe, the hole is sealed;
8. You can try the system in test mode.

How to lengthen coaxial chimney for gas boiler

If gas closed equipment is used to heat the apartment building, it may be necessary to eliminate the chimney system.

For installation you will need:

• Knee from propylene;
• Additional snifting pipe length no more than 5 meters;
• Adapting device for hermetic compound;
• Lining for fastening to the outer wall;
• Flanges and clamps.

All additional details for elongation must be purchased from the dealers of the producer of the chimney system, since the details of other brands may be incompatible with already purchased equipment.

Approximate value

The cost of the coaxial chimney largely depends on the configuration. For example, the base kit may differ in terms of cost depending on the diameter of the pipes. The most sought-after kit can cost from 4 thousand rubles to 13.5: What chimney pipes you need to purchase. Additional knees can cost from 1, 5 to 3 thousand, condensate collection - about 3 thousand.

If you want to buy a protective grille for the yield of the chimney pipe, then its value is about 3 thousand rubles.

As can be seen from our review - the coaxial chimney system is a new word in the construction of chimneys, it is completely autonomous and easy to use.

Coaxial chimney is a new technical solution that has replaced standard chimneys. A feature and high advantage of this apparatus is that oxygen for burning in the firebox of the boiler is closed from the street, and not from home.

Construction coaxial chimneh

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 meet the variant of the collective chimney to which individual boilers are connected. Such chimney goes to the roof

Coaxial chimneys are mounted in two positions:

• vertical;

• horizontal.

Only the method of installation differs, and the principle of the chimney is the same. Like all engineering systems, he has both advantages and disadvantages. Consider them.

Benefits

Structurally chimney consists of two pipes, one executes the role of an outer shell, the other internal. Through the pipe of a smaller diameter are distinguished by combustion products - exhaust gases. On the external pipe into the chamber of burning the boiler, air comes to maintain combustion. Such a system provides a compact and aesthetic appearance, takes little space. The system ensures heating of the exterior air by the spent gases, which increases the CPD of the boiler.

Another important advantage of this system is its fireproof. When the flue gases is removed, they are cooled by air, which enters the combustion chamber of the heat unit, reducing the risk of fire. Additional isolation of the chimney is not required by the foolish material.

This chimney system can be installed on various types of boilers:

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

Disadvantages of coaxial chimney

Frost. Probably, this is the main and most serious drawback when installing the horizontal chimney.

The first models of coaxial chimneys, which appeared in the Russian market, were not calculated on such low operating temperatures - -15 - -30 ° C. They are designed for the countries with a softer climate. As a result, the possibility of frosting the chimney and the failure of the heat unit.

Although not all experts are so categorical. In their opinion, the main reason for the frost of the coaxial chimney is the wrong heat engineering calculation. In this case, the efficiency of the boiler depends on the temperature of the supply air. In pursuit of an increase in efficiency, designers reduced the diameter of the exhaust pipe. In this case, the flue gases temperature drops below the dew point, which leads to an increase in the formed condensate inside the exhaust pipe and frost. To reduce the action of this factor, it is necessary to increase the temperature of the flue gases by increasing the pipe diameter. Properly selected coaxial chimney should not freeze.

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

Mounting Rules Coaxial Chimney for Gas Boiler

By installing the coaxial chimney independently, it is necessary to read the manufacturer's instruction. Be sure to adhere to the rules for installing a coaxial chimney.

• When installing, use only materials and components that have been checking in the State Romanzor; It is forbidden to make any changes to the configuration and the design of the chimney.
• When installing, it is forbidden to use the materials of the producer of the chimney; Required additional components to purchase only in service centers.
• All parts of the chimney are firmly connected and are tested for the presence of flue gases.
• The use of sealants and adhesive compositions is prohibited.
• It is forbidden to cut pipes into the thickness of the wall, it is necessary to ensure the place of the joint beyond.
• The horizontal coaxial chimney is set (unless otherwise specified by the manufacturer of the boiler): for condensation boilers 2-3 ° in direction to the boiler, for classic 2-3 ° outward, ensuring condensate drain and not falling into the boiler.
• The length of the coaxial chimney depends on the boiler model, the complexity of the chimney highway and ranges from 1 to 7 m. (Maximum length with a rectilinear installation for a boiler with an installed turbine, more than 30 kW.).
• It is forbidden to equip the yield of the coaxial chimney below the ground level in the window veil of the semi-basement room.
• Remember, for breakdown and accidents during the operation of the chimney, the installer bears responsibility.

Coaxial chimney installation scheme

The yield of coaxial chimney through the enclosing structures must correspond to a number of rules and requirements. Since boilers type C - with a closed combustion chamber can be installed in all types of rooms. Regardless of the presence of windows of the ventilation system and the size of the room itself, you must adhere to several norms. The photo shows the requirements of the installation of a coaxial chimney in different versions:

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

Choosing a coaxial chimney

When choosing a coaxial chimney, first of all, it is necessary to pay attention to the recommendations of the boiler manufacturer. There were cases when the service center did not accept equipment for a guarantee through the installation of a coaxial chimney that is not recommended for this boiler.

Coaxial chimney should ensure not only the withdrawal of flue gases, but also to fully ensure the oxygen fence from the street, so the reliability of its work is very important. Choose from proven foreign brands: BAXI, VAILLANT, NAVIEN, FERROLI, ARISTON, VIESSMANN.

Coaxial Chimney Baxi.

Chimneys are made of stainless steel and high-strength polymeric materials. The standard set includes a chimney pipe 1 meter, knee 90 °, nozzle for wind protection, decorative rings. If you need to use the extension, it is purchased separately. It should be noted that for the chimney up to 1m long, it is necessary to install a narrowing diaphragm for the boiler duct. The procedure is carried out to compensate for the thrust, since the boiler fan is designed for the maximum length of the chimney (5m), and in the absence of a diaphragm in the combustion chamber there will be a large amount of air, which will lead to a decrease in the CPD of the boiler. To protect against frost, the coaxial tube must perform from the wall on the length of the tip, not more. If the length of the pipe is more needed, too much is cut off from the inside.

Photo of Baxi main coaxial chimneys:

Chimney Coaxial Vaillant.

Vaillant is equipped with coaxial coaxial chimneys. The correspondence of the size of the pipes is the key to the successful operation of the boiler. We can also purchase coaxial chimneys of Wilter for boilers of other manufacturers.

Coaxial chimney Navien.

The smoke farming systems from the Korean company have proven well in the market of heating technology. Chimneys are released for wall and floor boilers with power up to 75kW. The cost of coaxial chimneys is a little lower than its European competitors, while the quality of execution is not inferior to them.

Various elements can be used in modern heating devices. Their composition depends on the variety of coolants and the method of heating. The obligatory component of such installations is the chimney responsible for the removal of smoke and other combustion products from the room. Let's figure it out that it is a coaxial chimney for a gas boiler and what is its advantages. With a competent installation, such a design does not only eliminate gary and smoke, but also provides a flow of fresh air.

So it looks like a design for the removal of combustion products

The design of the coaxial chimney for the gas boiler is not as complicated. It consists of two pipes of various diameters, which are installed in each other. In this case, there is a few centimeters between the walls.

Such chimneys are two types:

• collective structures are made only in industrial environments and are mounted only at the construction work. The device assumes the presence of heat insulating components;
• individual options are used in everyday life and can only be connected to one heating unit.

It works a coaxial installation as follows: on the external highway, the air is closed from the street, then it moves through the pipes and heats up. The air is fed to the furnace already heated, which makes it possible to lower the gas consumption. On the channel from within the smoke is derived. In certain devices there is a system of insulation. In order for the chimney design to work correctly, a high-quality assembly should be carried out. This includes security nodes.

For units with closed-type cameras, chimneys are suitable, the length of which is no more than two meters. This will prevent deunions from the appearance.

Helpful information! The coaxial option can be installed even in a wooden building, as it is perfectly protected from fires.

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Do you know what this technique is so good? In this review, we will consider all the advantages and disadvantages, as well as the secrets of choosing this type of boilers.

The location of the coaxial chimney system

Most often, the installation of the coaxial chimney is performed using a direct passage through the wall. In some cases, the device is used through the roof or overlaps. The best location for such a design is horizontal. If the heater is in a hard-to-reach place, the air duct is derived using vertical sites.

Such highways are ideal for parapet equipment and convectors. A coaxial type system can be used with a burner. Steel chimneys are suitable for dual-circuit and single-circuit units. In the manufacture of pipes, stainless steel, aluminum or plastic is used.

For your information! When selecting pipes for gas equipment, it is necessary to take into account that only the designs are suitable for individual heating devices, which are made by the same manufacturer as the main aggregates.

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In the article, consider the design features of the design, average prices, customer reviews and secrets of the right choice of this type of boilers .

Composition of the coaxial pipe to the gas boiler

Coaxial chimney for gas boiler contains such elements:

• straight pipes were used to form a chimney;
• a swivel element or a tee is used as connecting parts. With their help are mounted to the boiler direct parts of the device;
• special plot for maintenance work;
• capacitance for condensate accumulation;
• the upper part of the design that is used to protect the installation contours.

For the manufacture of installation, acid-resistant stainless steel is used capable of withstanding significant temperature increases. Chimneys are such:

• pipes without insulation have a simple device. This design must be additionally insulated to reduce the falling condensate;
• tubes with insulation are used for vertical structures. Insulated highways have excellent aerodynamic characteristics.

Important information! Many boiler manufacturers advise to mount coaxial equipment with a bias to the heating unit.

Why do you need a coaxial installation?

The most important advantage of the outdoor gas boiler with coaxial chimney is that fresh air flows allow to maintain the combustion process. When mounting such a device, you will not have problems with excessive dryness in the room. In addition, you do not have to air the rooms often.

The air passing along the installation contour warms up, thereby improving the combustion process. This contributes to greater equipment efficiency. Due to the constant inflow of air - the gas in the furnace chamber is completely burned, which increases the efficiency of the system. Coaxial highway has not such a high surface temperature as the traditional chimney.

For your information! It is possible to choose a coaxial type chimney to each heating structure. There are pipes of various diameters and from various types of material. Such a device will easily install even an unprepared specialist.

Coaxial Chimney: Installation and Installation Requirements

Some rules for mounting a coaxial chimney will help you build a high-quality heating system. Of particular importance is the step-by-step instruction:

• make sure all the elements are in their places. In addition to the pipe set, there must be connective parts and various insulation;
• before installing, you need to mark up, calculate all channels of the chimney and make all the necessary holes;
• installation of the heating unit and chimney is performed simultaneously;
• the output is placed above the heat chamber for one and a half meters;
• the chimney highway is fixed to the outlet with a clamp and a bolt pair;
• the design is collected by a special project;
• the installation knee is fastened with clamps;
• at the outdown section of the chimney, a small slope is created.

The chimney device through the wall does not require special devices and skills. This design is relevant for buildings with an autonomous heating system.

Such chimney elements are easy to install, and also have a high service life. Under the influence of low temperature values, some sections of the chimney design may vary, which affects the efficiency of the entire system. Insulation will avoid such situations. It is important to take into account the features of a specific device when the pipe in the pipe. An effective solution will be a decrease in the cross section of the chimney installation. You can try to make the inner tube shorter. This will prevent condensate icing. The installation of separate pipes made of steel is practiced. At the same time, one will take the air, and the second output combustion products.

Table You can see prices for separate models.

Picture	Models	price, rub.
	Ferroli Ø 60/100 (010012x0 / kit12x0)	1750
	Kiturami 125.	4300
	De Dietrich DY 908 DN 60/100 mm (800 m)	4100
	Set Universal 60 * 100 (pl) 750	3200
	Buderus 60/100 - Length 810 m	2900
	Navien set	3100

The decision to install the coaxial chimney will give good results. And useful recommendations and the application of instructions will help to establish a similar design yourself, without attracting specialists.

Coaxial chimney for the parapent gas boiler (video)

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