Warmth is one of the components of comfort and coziness in the house. Today, there are many ways in which you can heat your home. For apartment buildings the solution lies in centralized heating, while the owners of private houses have to install boiler equipment.

Such devices that work with fire necessarily require the presence of a smoke exhaust device. And if used before conventional pipes, today they have been replaced by a more perfect solution. Everything large quantity homeowners resort to the installation of coaxial chimneys, which are efficient.

Coaxial pipe device

The coaxial pipe provides for the presence of two nodes, one of which is inserted into the other. The design has two contours, which have different diameters and are arranged according to the principle of Russian matryoshka. Inside there is a jumper, which excludes the contact of parts.

Such a device is mounted in a heat generator, which has a closed combustion chamber, it should include a gas boiler. The coaxial pipe has such a device that the inner pipe is used to bring the products of combustion to the street, while the more impressive diameter pipe, which is located outside, is used to supply the oxygen necessary to ensure combustion.

A standard coaxial type chimney has a special device, it allows you to solve problems, one of which guarantees the combustion process, the other ensures the flow of air. The length of the device does not exceed 2 m. Typically, such structures are located horizontally, and are brought out through the wall. Sometimes there is a coaxial pipe that exits through the roof and ceiling.

Problem solving

The design of the described chimney allows it to work on a principle that differs from the usual one. The oxygen required for combustion enters the equipment from the outside. This eliminates the need for a constant supply of air into the room by ventilation, which is traditional for conventional smoke ducts. Among other things, several other problems that are characteristic of traditional chimneys, among them:

• reduction of heat losses;
• reducing the risk of fire;
• high ratio useful action;
• the course of the combustion process in a closed chamber;
• saving space;
• the possibility of choosing a chimney from a wide range.

More about the advantages of a chimney for gas boiler equipment

The coaxial pipe allows you to reduce heat loss due to the fact that the air entering from the outside is heated from the outlet internal hot pipe, resulting in a higher efficiency. The risk of fire is minimized, especially in areas that come into contact with the exhaust duct and flammable surfaces, because the inner pipe is cooled to a safe temperature when it gives off heat to the one located outside.

Such chimneys for gas boilers ensure complete combustion of fuel, and unburned particles are not thrown out and do not pollute the atmosphere. Equipment equipped with a coaxial chimney is environmentally friendly. Due to the fact that processes such as combustion, exhaust gases and oxygen supply occur in a closed chamber, the operation of the equipment becomes safer for humans, combustion products that could pose a health hazard no longer enter the room. This also indicates that the device of the ventilation system is not required.

Chimneys for gas boilers are quite compact in size, this additionally saves space. Having visited the store, you can find such designs that are presented in a wide range, certain models are used for systems of different capacities.

Installation Requirements

To date, there are two ways in which a coaxial chimney can be installed:

• vertical;
• horizontal.

The flue duct will have a direction that is determined by each boiler individually. It is important to consider that horizontal structures are intended exclusively for those devices that have forced ventilation. If you look into sanitary norms and the rules, you will be able to find out that the horizontal section must have a limited length, its maximum value does not exceed 3 m. But some manufacturers set other restrictions for their products. Therefore, before designing structures, it is necessary to familiarize yourself with the characteristics of the device.

Pipe orientation and connection

The coaxial gas pipe is located vertically if it is not possible to equip the channel outlet through the wall. This case applies to small street widths or close windows. coaxial chimney can also be oriented obliquely.

Installation work should begin after you can choose the right device. If we take into account the installation standards for the internal chimney, then the diameter of the outlet should not be larger than the diameter of the outlet channel. This moment should be controlled by referring to the data of the chimney passport, where you can find its diameter.

Coaxial pipes for gas boilers are connected to the equipment using a pipe, tee or elbow. Each subsequent element must be fixed to the previous one in such a way that no obstacles are created for the removal of combustion products.

Work methodology

The list of elements that will be required for installation will depend on where the outlet pipe is located - at the top or on the side. In the first case, the chimney is much easier to remove. For the second option, you need to use a horizontal structure, which is displayed using modifications and brackets in a vertical position.

To install the pipe, you need to use a transition node. Clamps are fixed to other elements in a rigid way. Using an adapter or homemade extension cords, winding with tape and applying sealant is unacceptable, because these options will not only be unsafe, but also unreliable.

When installing the chimney, it is important to remember that the outlet must be higher heater 1.5 m minimum. The pipe outlets must have an angle of 3 °, which will ensure the unhindered exit of condensate. The coaxial chimney is best placed above the roof surface at 1.5 m, in otherwise clogging may occur.

If it is supposed to equip a rather complex system, then the total length should be 3 m. The installation of a coaxial pipe should not involve the presence of more than 2 elbows. From the nearest windows to the outlet, a distance of 60 cm should be provided, as for the distance to the gas supply pipes, this parameter should be 1/2 of the diameter of the outer pipe. Fragments of the structure should adjoin each other as tightly as possible; if obstacles are to be surrounded by a chimney, then a special elbow should be used with different angles tilt. You can use two such nodes at once.

Arrangement of a responsible area

The roof area is considered the most critical area, here work must be carried out taking into account fire safety. For this, insulating pipes are used, as well as non-combustible insulation. Between the pipe and the ceiling must be left air layer. The flue duct must not come into contact with objects; protective covers are used for this.

If the chimney is discharged through the roof, then this assembly must be sealed by protecting it with an apron, which should cover the junction. When the output is through a wall, non-combustible materials must be used. The coaxial chimney must always remain cold, this feature is one of the main ones.

Chimney freezing

Quite often, the owners of boiler equipment wonder why the coaxial pipe freezes. In this case, the boiler room may even stop functioning. In order to avoid such a nuisance, it is important when connecting the boiler to try not to ignore the manufacturer's advice. It is necessary to observe the length of the pipe, its location and slope. The presence of a fan will free the chamber from combustion products, it will provide rarefaction, which is necessary for sucking in new air.

Coaxial kits also differ in the material of manufacture, as well as in design, so some of them may freeze while others function normally. If the vertical coaxial pipe is frozen, then the problem can be partially solved by removing the plugs that are located at the top of the boiler. Flue gases in this case will go outside, and air will begin to flow from the room.

The plug should be reinstalled once the ice has melted. After all, the boiler will not be able to work in this mode all the time. Failure of the unit is inevitable if airborne particles such as kitchen dust and soot enter the equipment. When icing does not happen so often, this method is quite possible to use, but with regular freezing, you should purchase an "anti-ice" kit.

Conclusion

Coaxial pipe 60/100 can be purchased by you for 1500 rubles. It is an active structure that is able to improve the environmental performance of the boiler and its fire-fighting properties, while increasing the efficiency of operation. You can do the installation yourself, but if you doubt your abilities, then it is better to entrust the installation to professionals.

The advantages of such a chimney

Mounting Features

Every person wants to be warm in his house. After all, it depends comfortable accommodation all family. Those who don't have district heating must take care of it themselves. In addition to installing the boiler and other components, you have to solve the issue with the chimney. Without it, the smoke from the combustion of fuel would go straight into the room. Previously, ordinary pipes were used for this. However, over time, a coaxial chimney was invented. What is this device? What is its advantage? These issues deserve special attention.

What is a coaxial chimney?

Coaxial means one object inside another. The chimney was so named because it also has one pipe built into another. Inside, they do not touch each other, but are connected by a jumper. This device is designed for gas boilers, convectors, radiators, and other devices with a closed combustion chamber. The coaxial chimney has 2 tasks:

1. provides a constant supply of air for combustion of gas in the chamber,
2. removes the combustion products.

coaxial chimney design

Its working principle is easy to understand. Air enters through the outer tube and exits through the inner tube. harmful substances. Usually this design is about 2 m, and it consists of the following parts:

• straight pipes - they form the channel of the chimney system itself;
• a collector for condensate - since water vapor accumulates in the pipe, it must not be allowed to enter the boiler;
• tee - used when connected to the boiler;
• knee bent 90% - this part helps to make turns in the chimney;
• cleaning - allows you to carry out routine maintenance;
• tip - protects from rain and wind.

This is the design of a standard chimney, but if its orientation is horizontal, then more often composition will be as follows:

• straight pipes,
• bent knee,
• side tip.

3 types of steel are used for the manufacture of coaxial chimneys:

1. stainless,
2. acid-resistant
3. galvanized.

In addition to these options, there are also combined designs, where parts from different steels are combined. Due to the fact that the device is made of quality material, it is not destroyed. These are the main points to be aware of when choosing a coaxial chimney.
But for it to work well, you should seriously approach the acquisition of equipment. Before buying, you will have to consider some points:

• do detailed plan lines with exact dimensions,
• what type of fuel
• outside temperature,
• room isolation,
• boiler performance may affect the choice of pipe,
• product quality,
• wall thickness.

Given all this, it will be possible to select pipes of a suitable diameter, length, and so on.

The advantages of such a chimney

There are many arguments in favor of using a coaxial chimney.

• One of the most important benefits is that the oxygen necessary for the combustion of gas is taken from the street. Conventional boilers are fed with air from the room, so it becomes stuffy.
• Heat loss is also reduced. This happens due to the fact that Fresh air enters through the outer pipe, which is heated from the inner. Therefore, this air is also warm. This design significantly reduces the heat loss of the heating line.
• Environmental friendliness of the process. Due to the fact that such a process has a high efficiency, the gas in the boiler burns completely. Because of this, there are no emissions that harm the atmosphere and humans.
• Prevents fire. Just as the outer tube heats up, the inner tube cools down. Therefore, if flammable objects come into contact with the chimney, there will not be a high temperature for ignition.
• People won't have to breathe smoke or carbon monoxide. It is unpleasant for everyone when a strong smell of smoke from the stove appears in the house. This negatively affects the human body. But, since this chimney supplies the oxygen necessary for combustion, all processes take place in a closed chamber. This means that nothing enters the room, and there is no need to breathe smoke or equip the hood.
• A large assortment. The choice of this equipment is very wide. Therefore, you can choose it for a system of any power.
• Compactness. Coaxial chimneys are small in size, so they do not take up much space from the area of ​​\u200b\u200bthe room.
• Installation. Installation of this design is very easy.

So, from the points listed above, you can see how convenient it is to use a coaxial chimney.

Mounting Features

Speaking about the installation of this equipment, it should be remembered that there are 2 options - vertical and horizontal.

1. The vertical outlet of the pipe is used if it is not possible to mount it in the wall.
2. Horizontal installation is carried out on condition that the boiler has forced ventilation. According to the rules, the maximum length, horizontal installed chimney, should be no more than 3 m. But, before installing it, it is better to read the instructions from the manufacturer.

standard and coaxial chimney

Next, it is worth considering the basic principles of mounting this device.

• First you need to choose a place for the boiler and pipes. They must be installed at the same time. In relation to the boiler, the chimney must be 1–1.5 m higher. If there is a need, the pipe can be extended up to 3 m in height. And in relation to the ground, the structure is raised by 2 m. Also, it is necessary to maintain a distance of at least 0.5 m from windows, ventilation openings and doors. Windows located above the chimney should be at a distance of 1 m from each other. No obstacles, like walls, should be closer than 1.5 m.
• The next step is to verify the purchase. Make sure that all parts of the device are in place. Otherwise, in the middle of the installation process, you will have to run to the store for the missing element.
• Now you can start the work itself. First, a hole is drilled in the wall. Its diameter is measured by the chimney.
• The pipe is led into a hole, and then connected to the boiler using a clamp. When assembling all parts of the chimney, it is necessary to maintain an angle with respect to the ground. This is done so that condensate flows behind the building, and not into the boiler.
• The hole made is sealed mounting foam around the chimney.
• For an aesthetic look, various nozzles are put on the joints. They can be attached with liquid nails or construction adhesive.
• If a pipe exit is made through the roof, then it is important to use insulating pipes and non-combustible insulation. Also, do not forget to leave an air gap between the ceiling and the chimney. The hole through which the pipe is led must be carefully sealed.
• The last step is to test run the system.

It is very important, when installing a chimney, to adhere to safety precautions. Since the pipes can be sharp, it is safer to work with gloves. It is possible to strengthen and seal joints exclusively with refractory materials. By adhering to these installation and safety instructions, you will be able to make a quality smoke outlet.

However, there is a problem that can still be encountered - freezing of the chimney. If you ignore this possibility, then freezing can lead to damage to the heating unit. At the moment, experts believe that the problem is in the wrong thermotechnical calculation. Since the efficiency heating apparatus depends on how hot the supply air is, then the designers reduced the diameter of the pipe for the exit of the combustion product. This increased their efficiency. However, precisely because of this, more condensate appears in the inner pipe, which subsequently freezes. To avoid this problem, it is advised to choose the correct diameter and length of the pipe.

Gas boilers with coaxial chimney

Seeing the advantages of such a chimney, many want to use it. However, for this you need to choose the right boiler, because in order to use a coaxial chimney, you need a closed combustion chamber in the boiler. For this, gas-powered devices are suitable. But is it worth buying them? How are they different from conventional boilers?

exit of the coaxial chimney from the wall of the house

Nowadays, such equipment is in great demand. What is the advantage gas boiler with a closed combustion chamber?

• Today, in order to install the boiler, safety requires a specially designated place. It must be properly equipped and have forced ventilation. If the house does not have such a room, then it is necessary either to make an external chimney or re-plan the house. Both of these options are unprofitable from a financial point of view. Therefore, the solution to this problem will be a boiler with a closed combustion chamber and a coaxial chimney. Thus, it can be emphasized that this equipment will significantly save money.
• You can install such a boiler anywhere in the house, regardless of ventilation. the only important condition is the distance from the window. Therefore, such a room can be an attic, a kitchen, ground floor etc. You can't say that about many boilers.
• Chimney installation. This is another argument in favor of a gas boiler with a closed combustion chamber. To install a coaxial chimney for it, you do not need to have special skills, but just follow the instructions.
• Another advantage of such a device is its high efficiency. This point is very important in terms of fuel economy. As mentioned above, the hot air coming out of inner pipe, heats cold air, which is directed to the boiler through an external pipe. Due to this, energy is not spent on heating the air entering the apparatus. All heat energy is used for heat carrier.
• This process should be considered from the reverse side. The outer pipe, taking heat from the inner, cools it. Thus, all equipment does not heat up to a dangerous temperature that can lead to a fire. Other boilers with a chimney do not have such fire ratings.
• Due to the high efficiency, gas equipment also has high environmental characteristics. After all, if all the gas inside is burned, through the constant presence of oxygen in the chamber, then no harmful substances are released into the atmosphere.
• Resident safety. This is another clear advantage. Since the combustion chamber is closed, neither gas nor smoke enters the room. In addition, the risk of fire is eliminated.

It is not surprising that today this equipment is in great demand in the market.

Conclusion

What conclusion can be drawn from the above information? The coaxial chimney is a very practical and useful invention. Unlike the usual one, it performs 2 functions at the same time - the removal of combustion products, and the introduction of the air necessary for combustion into the chamber. Of these advantages, one can especially highlight high efficiency, safety for people and the atmosphere, ease of installation. This is what every person today expects from a heating system. In addition, this chimney is compatible with the most popular type of gas boiler.

V wooden house most often they began to use autonomous heating systems, consisting of many elements. Their composition may vary depending on which coolant is chosen or how it will be heated. It is worth noting that regardless of the material used for the furnace, the boiler must have a smoke exhaust system or, in other words, a chimney. The design can have a different configuration, features and even technical characteristics, however, among many, the coaxial chimney is recognized as the most popular.

A coaxial pipe for a gas boiler is not just a product, but one that has a lot of advantages, due to which it has become so popular. High efficiency is ensured by perfectly heated incoming air.

Compact dimensions are characteristic, since installation of 2 large pipes is not required, but one is enough.

The pipe does not require installation of additional ventilation. Environmental friendliness is extremely important for a person, since it is often possible to find heavy and cheap materials that can release toxic substances when heated.

Advantages:

1. The optimal cost of the product.
2. It is possible to solve the problem with the formation of condensate in the chimney, since it simply will not exist.
3. Reduced fuel consumption when it comes to the bath.
4. Cold air enters the chimney, which prevents overheating of the chimney during the operation of the boiler.

A device such as a vertical coaxial smoke outlet is used for a heating system in which a gas boiler is installed with a closed combustion chamber. The device for direct heating can be in the form of a gas boiler, convector or radiator. The installation of a double-circuit coaxial chimney should be carried out as correctly as possible so that the principle of operation is not violated. Each circuit is responsible for its specific task. The first is required to remove combustion products from the furnace cavity in the boiler. The second is intended for air flow into the cavity of the furnace, which ensures efficient combustion.

Our next article discusses in detail the criteria for choosing double-circuit boilers:.

It is precisely in order to have excellent draft and uniform combustion of gas that it is worth installing a coaxial chimney in a boiler with a closed combustion chamber, the length of which, according to the rules, does not exceed 2 m. Otherwise, turbulences may form on the pipe that prevent the exit of combustion products from the furnace.

Coaxial type chimney: installation requirements

In order to install a heating boiler in which the combustion chamber is closed, it is necessary to carry out installation independent system heating, can be used for individual construction, as well as in apartment building or industrial premises. If a decision is made to install a coaxial chimney, then you will need to comply certain rules and requirements that the device be carried out as correctly and without missteps as possible.

Requirements:

1. The maximum length of the coaxial chimney should be 2 m, but it is not uncommon to lengthen the distance if Ferolli is installed during installation outdoor view. In this case, coaxial chimneys are used, the length of which is 4-5 m.
2. The pipe must be brought out only using a horizontal method through the wall near which the gas boiler is installed. The length of this output section is 90-100 cm.
3. If there is a need to install forced draft, then you should choose a fan, in which case you will not need to install the vertical part of the system.
4. The hood or outlet is located at a height of 2 m from the ground level, however, it must be at least 1.5 m from the boiler.
5. The place where the chimney outlet will be laid should be next to the wall, at a distance of 50 cm from the window.

It is strongly not advisable to install a coaxial chimney under the window opening, but if there is no other option, then there should be a distance of 1 m. To eliminate condensate, installation of a coaxial chimney and a slight slope of the pipe is required.

Functions of the coaxial boiler

The coaxial boiler works, like everyone else, in order to heat the room, but why is it called that? coaxial boilers got its name due to the installation of coaxial chimneys.

Such a chimney performs the following functions:

• Combustion products are removed;
• The design of the chimney is very simple;
• The peculiarity lies in the installation of a pipe in a pipe.

The inner cavity is responsible for the removal of smoke. Air is also supplied to the combustion device or, in other words, the air mass is taken. Due to the air, the boiler functions along the cavity of the outer pipe.

Stages of installation of a coaxial chimney

The chimney for a coaxial boiler must be installed in accordance with provisions such as SNIP norms, carefully thought out, of high quality and working properly. A coaxial chimney differs from a vertical and traditional device in that it is not difficult to install it, and a number of special skills or training are not required, it is imperative to follow the instructions so that the installation technology is not violated. Only in this way can you be sure that the product is working properly and the penetration of smoke into the room is categorically excluded.

Stages:

1. Connection at the first stage consists in preparing a place for the future location of the boiler. Floor boilers should be installed on footboards, and wall-mounted on the surface of the outer wall.
2. The outlets on the chimney must be marked on the surface of the same wall near which the boiler will be installed, but only at a height of 1.5 m. The diameter of the place where the chimney is planned to be located should be slightly over size the pipe itself.
3. It is required to install a special connecting element, through which the heating boiler and chimney will be installed. Each turn and joint of the pipe is fixed with a special mounting clamp.

It is strictly forbidden to install a coaxial chimney with adhesive tape or sealant. The hole in the wall space must be laid with a special non-combustible insulation.

If the boiler has forced ventilation, then it is required to install only that section of the chimney that is horizontal.

If there is a need to make a turn in the pipe, a special swivel elbow can be used, and a maximum of 2 elbows can be installed on 1 chimney. The installation of the pipeline on the wall surface is carried out using brackets, and so that they are necessarily present at each joint. At the end of the coaxial chimney, it is undesirable to install such additional elements like umbrella, deflector and others.

The maximum length of the coaxial chimney for a gas boiler and the advantages of the chimney pipe

Depending on the model of the coaxial boiler, the length of the chimney is selected, however, an extension is possible if this is allowed by technical specifications. On average, the length can be 3 m. A coaxial chimney has certain advantages, due to which its popularity is increasing almost every day.

The advantages are:

• Ease and speed of installation;
• Possibility to use the product for any heating equipment;
• Excellent traction, provided that the installation is carried out correctly and strictly according to the technology;
• The ability to use the device for apartment building.

Unfortunately, there are also disadvantages of such products, but against the background of many advantages, they sometimes fade into the background. To carry out the installation, you need to coordinate the actions with the sanitary and epidemiological supervision. During operation of the chimney, toxic condensate is released, which is forbidden to be poured into the ground, and is a direct pollution environment. Disposal of such condensate must be carried out in a separate place. If you install a structure of this two-channel type in a house with many apartments, then there may be indignation from the residents. If there is no appropriate permission from the organization, then it will be necessary not only to remove the installation, but also to pay a fine. No matter how the condensate is isolated, it will be too large, and a minimal violation of the installation technology will lead to many problems.

What is a coaxial chimney (video)

The coaxial chimney is great option for installation on pipes for the removal of combustion products to a gas boiler, since relative to other structures, it has a mass positive sides and long term operation. The most important thing is to get quality equipment and properly install.

Examples of a coaxial chimney (photo)

accommodation in country houses impossible without arrangement heating system, and is considered the most economical gas heating. But for gas, as well as for another type of fuel, both the influx of oxygen and the removal of combustion products are necessary. AND the best system chimneys is recognized as coaxial: it can simultaneously cope with both the removal and the influx of the gases necessary for combustion.

What are coaxial chimneys

Coaxial means internally combined, or in another way, one in the other. A coaxial chimney is a structure of two pipes, which are reinforced with jumpers that do not allow them to come into contact with each other. This arrangement of the chimney system is best suited for gas heating boilers, but it can also be used in other heating systems where the combustion chamber does not have open access.

A coaxial chimney can simultaneously supply air to closed cell combustion, and remove the resulting carbon dioxide to the street.

Device

Since this system needs not only an influx of oxygen, but also an autonomous removal of condensate and combustion products, it consists of several components:

• Double straight pipes for the removal of carbon dioxide;
• A small container for collecting the resulting condensate: in no case should it fall into the combustion boiler;
• Connecting triple design is used to collect all parts;
• Bent at 90 0 elbow designed for turning the chimney pipe;
• Cleaning systems: with its help, repair or maintenance work is carried out;
• Tip - it is designed to protect the system from precipitation.

Pros and cons

What are the positive characteristics of a coaxial chimney system?

• The intake of air necessary for combustion comes from the street, which does not create a stuffy environment;
• Minimum heat loss, since the air is supplied through the external pipeline, and it warms up from the internal structure;
• Meets all environmental requirements: a gas boiler has a high percentage of efficiency, and all fuel burns completely, so components harmful to nature and humans are practically not emitted into the atmosphere;
• Meets all requirements fire safety: both pipes compensate for heating and cooling, and therefore, even if they come into contact with flammable objects, ignition cannot occur;
• The compact design allows you to install in any, even a small room;
• Installation does not provide for violation of the integrity of the roof of the house.

There are very few disadvantages of such a chimney system, these include high cost and low aesthetic perception: if installed in the basement, it can slightly reduce the harmony of the room.

Kinds

The coaxial chimney system can be horizontal and vertical view, each of them can be installed under certain conditions.

Vertical. For this system, it is necessary to equip a drain on the roof of the house, and a condensate collection tank is also very necessary, but usually the entire necessary set components are already included in the delivery of the chimney.

Horizontal. This is the most popular coaxial chimney system, because its installation is very simple: you need a hole in the wall and that's it. In addition, there is no need to equip a place for a chimney on the roof, and the collected condensate can be discharged directly, that is, there is no need to equip an additional container: it simply flows down the pipe to the street if the pipe is installed with a slight slope.

Placement of coaxial chimney systems

1. Experts recommend determining the location of the chimney system only after installing the gas combustion boiler itself.
2. Place pipes from window and doorways at a distance of at least 50 cm. To ensure the best traction, the first component pipe must be at least 1 meter long. It is fixed at the place of the boiler outlet on the branch pipe with a metal clamp.
3. If the boiler is equipped with natural exhaust, then the chimney elbow must be installed above this structure. If a fan is installed, installation can be carried out at any height.
4. Then you need to equip a hole for the pipes to exit to the street, if the house is made of wood, then you will need to install a thermal insulation layer: this will prevent a possible fire in the tree.
5. So that the resulting condensate can escape through drainage system to the street, the pipes are mounted with a downward slope.

Installation

Fire authorities require for the arrangement of the heating system the presence of a separate standing room, which is ventilated and has everything necessary equipment. It leads to extra costs, you need to either rebuild already finished house, or equip a separate chimney system.

But all this can be avoided if you purchase a gas boiler. closed type combustion and equip a special coaxial chimney system, which will save the owner of the house money on arranging a separate smoke outlet.

And only 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 basement of the house. About boilers with open type combustion is impossible to say.

The rules for mounting connections must be observed: they must end before the system exits the wall hole. The pipe itself must protrude from the wall by at least 20 cm, and a greater distance is allowed.

To ensure that the reverse thrust cannot be returned to the boiler, a special valve is equipped on it, which will prevent this phenomenon.

The connection of all parts of the chimney is carried out using clamps and, in some cases, insulation. Building foam can be used to achieve better sealing.

Tip: use as few vertical parts as possible: this way the efficiency of the chimney will be higher.

Exists regulatory rules self installation coaxial chimney:

• For installation of the system, it is recommended to use only parts of the kit;
• Do not use self-produced parts, but purchase missing parts only from service centers manufacturer;
• After installing the chimney system, it must be tested for leaks;
• Docking of joints should be carried out in free, and not in wall space.

Step-by-step instruction

1. First determine the location of the gas boiler;
2. Installation gas equipment carried out simultaneously with the installation of a coaxial chimney system;
3. The chimney itself should be located 1.5 meters above the gas boiler itself;
4. Fulfill the fire safety requirement: arrange the chimney pipes so that between the window, vent hole and the door was at least 50 cm;
5. Make a hole for the pipe outlet in the wall in accordance with the diameter;
6. Connect the pipes to the boiler outlet with a metal clamp. Do not forget about the slope to the ground to drain condensate;
7. After installing the pipe, the hole is sealed;
8. You can try the system in test mode.

How to lengthen a coaxial chimney for a gas boiler

If gas enclosed equipment is used to heat an apartment building, it may be necessary to extend the chimney system.

For installation you will need:

• Propylene elbows;
• Additional flue pipe no more than 5 meters long;
• Adaptive device for tight connection;
• Pads for fastening to an external wall;
• Flanges and clamps.

All additional extension parts must be purchased from the chimney system manufacturer's dealers, as parts from other brands may not be compatible with equipment already purchased.

Estimated cost

The cost of a coaxial chimney largely depends on the configuration. For example, the basic kit may differ in cost depending on the diameter of the pipes. The most sought-after kit can cost from 4 thousand rubles to 13.5: which chimney pipes you need to purchase. Additional knees can cost from 1.5 to 3 thousand, a condensate collector - about 3 thousand.

If you want to buy a protective grill for the exit of the chimney, then its cost 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.

Comfortable life in the house depends on the efficiency of the heating system. Home heating is associated with the use of open fire devices, which reduces the oxygen content in the atmosphere inside the house. Vicious circle? Not at all. The problem is solved by using coaxial chimneys for the removal of combustion products. What is it and how to build it yourself?

What is a coaxial chimney

An autonomous home heating system for any device requires the complete removal of combustion products. Traditional systems chimneys are used in our time. However, they are being replaced by new devices that solve several problems at the same time - coaxial chimneys.

Their appearance is associated with the solution of the problem of fuel combustion in the furnace, which occurs with the participation of oxygen from the heated room. If you do not renew concentration by airing, the room becomes stuffy and uncomfortable. The conclusion is obvious - isolate the fuel combustion device (boiler) and supply oxygen to the furnace from the outside. To do this, two-layer pipes were used, in which combustion products are removed internally, along the gap between the internal and external air from the street.

Coaxial chimney device

Advantages of coaxial chimneys

They are as follows:

• Increased efficiency of boiler equipment compared to traditional devices, obtained by supplying heated air with a normal oxygen content to the boiler furnace. This contributes to a more complete combustion of the fuel;
• no need for additional supply ventilation in room;
• increased environmental friendliness obtained by efficient fuel combustion;

Flaws

These include the tendency of the inner pipe to freeze. This is possible due to the low temperature flue gases already at the exit from the furnace. As a result, condensate is formed, which freezes when the outside temperature is below -15 degrees, which is not at all a wonder for Russia. The degree of freezing can completely block the channels for the movement of gases and air, which means an emergency.

Attention! It is impossible to allow complete freezing of the pipe, this causes the equipment of the boiler to fail.

As practice shows, such phenomena often arise from the desire to maximize the efficiency of the system by reducing the diameter of the internal chimney pipe, which leads to a decrease in gas temperature down to the “dew point”, increased condensation and, accordingly, to the formation of ice.

Kinds

Devices for removing combustion products of this type are divided according to several criteria.

Indoor and outdoor systems

Internal systems are located in mines specially arranged during the construction of the house. They are in no way in contact with the living space. In some cases, such devices are arranged in a standard brick chimney, but it should be noted the inconvenience of such chimneys for maintenance and repair.

Ways to install a chimney in a house

External chimney systems are arranged directly on the wall of the house from the outside. It is believed that they spoil the design of the house, so they are located with access to the patio. Such a scheme of the device is easy to install and convenient to maintain and repair.

Conclusion of the coaxial chimney through the wall of the building

Cold and insulated devices

As noted above, in the conditions of our harsh winters, the chimney freezes through. To avoid this effect, it is necessary to insulate the chimney. For this, several methods are used:

• Using an optional casing from a pipe larger diameter. At the same time, the interval between outer pipe and the casing is filled with insulation. For this, mineral wool is used;
• Outer pipe coaxial system turns around roll insulation. Wrap a protective jacket over this layer. aluminum foil and secure it with clamps. The winding direction should be carried out in such a way that moisture does not flow inside the insulation layer, that is, it should be done from the bottom up.

Vertical or horizontal output

Initially, coaxial designs were developed as exclusively horizontal devices. But this is a theory, but in practice the location of the thermal unit becomes a decisive factor, which in some cases requires a combined design.

Vertical outlets are used only for boilers without forced draft.

Internal vertical and external combined coaxial chimney

Design and principle of operation

The coaxial piping kit includes a different number of parts, depending on the scheme of the chimney device.

The design of the coaxial chimney

The main ones are:

• adapter for connection to the combustion unit;
• elbow 90 degrees to change the direction of the pipeline;
• The pipe is coaxial straight. Structurally, it consists of two parts located one inside the other with longitudinal partitions between them;
• a coupling with a seal and a coupling clamp to strengthen the joint;
• air intake.

The principle of operation of a chimney of this design is that during the combustion of fuel, flue gases are formed that immediately rush into the pipe. The resulting low pressure zone is filled with outside air through the channel between the pipe walls. Warming along the way from the inner pipe, it enters the furnace and the heated oxygen actively reacts with the fuel. At the same time, the efficiency of the device increases significantly. The cooled outer wall is favorable for the fire safety of the device.

Materials and tools for chimney installation

The completeness of the chimney depends on the location of the thermal unit. The device consists of a number of standard units that allow the execution of chimneys of any configuration. The modules are modified, which makes it easy to complete the device with the necessary parts and simplifies installation work. When creating a coaxial chimney, the following nodes are used:

• straight pipes - the main element of the chimney;
• tees - performed at angles of 30, 90 and 45 degrees, designed to change direction during installation;
• couplings and bends angular - connection of pipes;
• condensate collectors - used in each vertical section, equipped with a water seal to prevent outside air from being sucked in, this reduces the draft in the chimney;
• inserts with inspection windows for repair and maintenance of the chimney;
• Inlet and outlet nozzles - come complete with heads, are used to remove furnace gases and take air from the atmosphere. The outlet nozzle is installed at a distance from the air intake to avoid mixing clean air with combustion products;
• adapter - devices for connecting the chimney to the heat generator;
• mounting fittings in the form of flanges, clamps and brackets;

The material for the manufacture of chimney elements can be:

1. Steel sheet stainless.
2. The sheet is galvanized.
3. Heat resistant plastic.
4. aluminum alloys.

The general requirement for them is resistance to temperatures not lower than 250–300 degrees.

When assembling the chimney, use the simplest tool for installing fasteners such as screwdrivers and wrenches. To attach the brackets to the walls, you will need an electric drill and plastic inserts - dowels. hole in brick wall can be done with a bolt and chisel.

Preparing for the installation of the chimney

Despite the seeming simplicity of the chimney assembly process, it must occur according to a certain algorithm:

1. Purchase of a heat generator. It should be borne in mind that coaxial chimneys are used only with closed-type devices with forced draft. Their power is up to 30 kW.
2. Determination of the installation site, fixing.
3. Implementation of a draft design of the chimney, taking into account bends, rise and other features that depend on the architecture of the building.
4. Acquisition of a set of standard parts that ensure the exact fulfillment of the requirements of the preliminary design.

Do-it-yourself installation of a coaxial chimney

Before proceeding with the assembly of the chimney, you need to clearly understand the main regulatory provisions:

Rules for the device for the removal of combustion products

When assembling the chimney, you must adhere to the following rules:

1. The straight section crossing the wall should be installed with a slope of 3 degrees towards the street for unobstructed condensate drainage.
2. The chimney channel along its entire length should not include more than two elbows.
3. Inspection windows, transition devices and condensate collectors should be installed in easily accessible places for ease of use.
4. The chimney must not lead below ground level. The distance to the nearest building must be at least 8 meters. When using a deflector at the end of the chimney, this distance can be reduced to two meters for a blank wall and up to five for a building with window openings.
5. A horizontal chimney installed in the place of prevailing winds, opposite in direction to the smoke outlet, must be equipped with a visor - damper. It should be located no further than 40 cm from the smoke outlet.
6. Coaxial chimneys located at a height of less than 1.8 meters must be equipped with a reflector grille to protect against hot smoke.

Installation of a horizontal coaxial chimney

Compliance with these rules will allow safe operation heating device with high-quality removal of combustion products.

Build Order

Installation of a horizontal coaxial chimney is carried out as follows:

• connecting the adapter from the heat generator to the chimney;
• installation on an elbow adapter to change the direction of the channel;
• Marking the place for making a hole in the wall for the corresponding diameter of the chimney pipe. Important! the joint of the pipeline elements should not be inside the wall;
• installation of decorative plugs at the intersection of the chimney with the wall;
• installation of a deflector at the end;
• installation of an inspection unit and a condensate collector.

Upon completion of the assembly, it is necessary to check the compliance of the assembled device with all the rules that were outlined above. It should be remembered! The use of sealing gels and sealants in coaxial chimneys is prohibited.

Installing a coaxial chimney vertically, as a rule, is a forced measure, due to the impossibility of horizontal execution without violating the installation rules. The design feature is that such outlets of combustion products cannot be installed in a straight line from the furnace due to the formation a large number condensate. With this design, it will fall directly into the furnace, which is highly undesirable. Therefore, from the furnace you need to make a knee for the horizontal component. Next, a second elbow and a condensate collector are installed. After that, the chimney is mounted vertically. Intersection with ceiling and roofing cake performed using glasses - insulators. On the roof, the pipe is equipped with a sealing umbrella to prevent leaks.

Attention! The vertical coaxial chimney is not used for closed boilers with forced draft.

Operation features

First of all, attention should be paid to the noticeably higher efficiency of furnaces with such devices for removing combustion products. The efficiency increases due to optimal mode fuel combustion.

With normal heating of the dwelling, the air in it does not deteriorate, remaining clean, since oxygen from the outside air is used for combustion. V mandatory organization supply ventilation is not necessary, although it is usually created anyway, it will not be superfluous.

Coaxial chimneys are different long-term operation, because there is no overheating of pipes, constantly cooled by air flow.

Repair and service

The device practically does not require special maintenance. At the beginning heating season you need to inspect all fasteners and screeds, tighten loose connections.

A regular maintenance measure is the periodic draining of condensate from the storage tank. Moreover, the frequency of such an operation is determined by the weather that affects its formation.

The need to clean the wall of the inner pipe is determined by visual inspection through the inspection window before the start of the heating season. The procedure is performed with a special ruff equipped with hard bristles. Apply chemicals softening soot and soot.

Coaxial chimneys should be recognized as the most perfect for saving heating costs, which are reduced by 15–20%. This improves the living conditions in the house.