Wall-mounted coaxial gas boiler - why is it better than usual. Coaxial chimney installation standards: basic installation requirements

Autonomous heating systems are deservedly in high demand among owners of private houses and commercial real estate. Gas boilers are most in demand, because "blue fuel" has affordable price on the market. IN last years crisis phenomena in the economy and a decrease in the income of the population make us think about acquiring the most economical heating equipment. No one wants to recklessly burn natural gas, winding unbearable amounts on the meter. The coaxial heating boiler has the highest efficiency among heating equipment. During operation, it consumes less fuel than any other heating equipment.

Features of coaxial boilers

Boilers of this type got their name from the system used to remove combustion products. The chimney has a design that is most easily described by the term "pipe in pipe". The inner pipe plays the role of removing the products of combustion, which have a high temperature and heat the air entering through the outer pipe. As a result, in gas burner pre-heated air enters for better heat dissipation.

The second feature of the boilers is the use of a return heating system in a condensing heat exchanger. Thanks to this technology, the “return” to the boiler comes with more high temperature coolant and for its heating requires a smaller amount natural gas.

Advantages and disadvantages of coaxial boilers

The main advantage of gas boilers of this type is high efficiency. IN technical specifications figures such as 105-109% are indicated, which are explained by the double use of the received heat. In addition, coaxial boilers have the following dignity:

• Automated ;
• Compact dimensions;
• Low fuel consumption;
• Possibility of installation in small rooms;
• Possibility of installation of weather-dependent automation.

Coaxial boilers are today the most high-tech solution for autonomous heating systems.

This equipment is produced by the world's leading companies that produce products of reference quality. It is for this reason that coaxial boilers are characterized by increased reliability in their work and have a long service life. Is it possible to find flaws in perfect equipment? Coaxial boilers have them: this high price equipment and the relative complexity of installing the chimney. The first of them scares away many buyers and in vain, since the difference in cost compared to an ordinary boiler pays off in several heating seasons.

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How to save more with a coaxial boiler?

There is no limit to the improvement of technology, as well as the desire to spend on public Utilities minimum funds. Is it possible to reduce heating costs when using a coaxial boiler even more than the equipment manufacturer promises? It is real - it is enough to install and it will be possible to significantly reduce the consumption of fuel consumed. Most of the time in country house or office, city apartment or shop where it is installed heating system, no tenants or employees. Accordingly, it is possible to lower the temperature in the room to a minimum.

The boiler can be controlled remotely using a smartphone, from any place where there is mobile connection. Going home or to work GSM thermometer it is enough to send a command by SMS message and by the time of arrival the room will be set to the maximum comfortable temperature. Optimal and carefully controlled gas consumption will reduce utility costs to a minimum.

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 ordinary pipes were used before, 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 nesting dolls. 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 more problems that are characteristic of traditional chimneys are quite successfully solved, among them:

• reduction of heat losses;
• reducing the risk of fire;
• high efficiency;
• 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, then 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 horizontal structure, displayed with the help of 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 pipe must be at least 1.5 m higher than the heater. The pipe outlets must have an angle of 3 °, which will ensure the unhindered exit of condensate. The coaxial chimney is best placed 1.5 m above the roof surface, otherwise it may become clogged.

If it is supposed to equip quite 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 pipe, 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 doesn't happen as often, this method it 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 design 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.

31.10.2017
964
Pechnik (Moscow)

The floor-standing gas boiler with a coaxial chimney is a universal heating unit that can be installed and placed in a private cottage or in a standard apartment building. Such a device is characterized by high efficiency and productive work. Floor-standing boilers with a coaxial chimney always have only a closed combustion chamber, since combustion products must not enter the room. At their core, such devices do not have a chimney, in its standard manifestation, and are installed in rooms with any footage.

Structural features and benefits

Floor gas chimney boilers of this type have the following advantages:

• When heating and using such a boiler, the air in the room is heated even in the pipes themselves, and the air masses are not taken from the room, but only from the street;
• For uniform, fast and efficient heating of several rooms or floors in a house at once, such a system can be connected to a water circuit;
• Due to the features and structure of such a heater, the air masses are cooled in a timely manner at the outlet, which prevents the body from overheating and completely eliminates the possibility of involuntary ignition;
• at the expense large sizes combustion chamber, a large amount of oxygen enters it, which ultimately forms the highest possible efficiency, reaching 80-95 percent;
• Carbon dioxide and air masses are diluted by different pipes and the described substances do not enter the premises.

Important:boilers floor chimney gasdo not take up much space, average weight and compact size, which allows them to be placed in rooms even with a small and limited area.

Gas floor-standing chimney boilers have the following structural features:

• This variety is characterized by the presence of two circuits represented by a pair of pipes, one of which is inserted into the other. However, at the same time, the flows of air and carbon dioxide do not merge and do not mix, since each pipe is separated by special jumpers;
• A small horizontally located chimney in this case performs two functions. It brings decay products to the street and sucks in the required amount of air masses.

After viewing the photo selection, you can see in detail the structure and appearance such installations, including various interiors apartments, houses.

Main varieties

Gas floor-standing chimney boilers can have different technical and operational characteristics, on the basis of which they are divided into the following categories:

Varieties	Description
	Chimney floor gas boilers are distinguished by their efficiency and versatility. For their operation and kindling, there is no need to use fuel, and installation does not require coordination with gas services with the appropriate documentation and certificates.
Pellet	The kindling of pellet models is done by hand. For work and functioning, you will need purchased pellets. The price for this variation, unlike gas modifications, is several times more expensive.

Important:chimney gas boilershave a large mass and medium dimensions. If the room for the installation of such equipment is limited in area, we advise you to pay attention to similar models of suspended wall type.

Interesting to know:gas floor standing chimney boilersare installed not through the roof and roof, but through the wall. In order for the traction mechanism to work properly and at full strength, it is recommended to use only the accessories and additional parts that are included in the set. It is equally important to equip such a chimney with a fan. Also pay attention to the tightness of each joint of the chimney and the structure itself. Before starting installation, make sure that the size of the section and the diameter of the pipes coincide with similar elements of the outlet. When installing from the outside of the building, take care of its thermal insulation.

Basics of installation work

Chimney for floor standing gas boiler needs proper and proper conduct installation work. In this case, the following instruction will help you:

1. For selection suitable diameter you need to find out the power of the heating unit, as well as take into account climatic conditions and average temperatures in summer and winter time of the year. It is also important what materials the house itself is made of;
2. If the circulation system is forced, only horizontal arrangement chimney system. If such an arrangement is not possible, it is allowed to mount in a vertical arrangement through the roof and roof;
3. During the installation process, you will need such parts and accessories as: flange, clamp, elbow, adapter, lining for decorative design;

1. In order for condensate not to accumulate and be discharged in a timely manner, there may be sections in the chimney design that have a small angle of inclination;
2. For the withdrawal of the chimney system, as a rule, is taken outer wall, located horizontally;
3. The length of the structure is no more than 2-3 meters;
4. To collect condensate, a special collector is installed in the inner surface of the pipe;
5. The angle of inclination of pipes can reach thirty degrees;
6. the outlet of the pipe must be placed at a height of at least 160 centimeters above the boiler itself;
7. The outlet will be slightly larger in diameter than the pipes of the chimney itself. This will prevent clogging of the inside surface of the hood.

Tip: since coaxial chimneys include two pipes at once, there is no need to insulate them yourself, since even in winter they will not freeze.

Important: despite all the advantages, such boilers have a number of their disadvantages. First of all, this is the high cost, as well as the difficulties resulting from the breakdown or disabling of such equipment. For the repair and replacement of individual parts, even in the best service center may take several weeks.

As a basis, professionals take the norms and requirements described and specified in SNiP 2.04.08 (87). In this case, the heat generator can be either gas equipment or a convector or radiator.

Additional installation requirements

Install this a heating element it is possible as concrete base floor, and on pre-laid insulation, represented by one or more sheets of metal (the protrusion on all sides of such a sheet should be about 30-40 centimeters).

The design provides for both vertical and horizontal arrangement of the chimney, which allows you to connect it from the top or block panel to choose from. It is equally important that the coaxial system is led out through the wall and located far from window openings, because in case of non-compliance this rule, carbon dioxide can get back into the house or apartment.

Important: it is especially important to follow the installation rules when installing such a device in a house with wooden base and finishing. Such buildings, as a rule, are characterized by a low level of thermal conductivity. Thus, in this case it is better to give preference to heating units made of copper, steel or cast iron. When installing and running pipes, wooden surfaces and floors must be insulated with special materials.

It is interesting to know: in addition to the differences between the models according to the type of fuel used and the method of operation, they can be divided into those consisting of one or two circuits. Double-circuit variations, as already described earlier, consist of two pipes placed one inside the other and separated by a jumper. This variety does not require insulation (simultaneously acts as a heater and water heater for household needs). Single-circuit boilers perform only one function of space heating, which makes them more powerful in this regard.

Standards and installation scheme

For a complete and correct operation heating device, it is recommended to take the following scheme as a basis, supplemented by the basic rules used by specialists in their work:

1. The room chosen for installation should have an area of ​​at least 5 squares. Wherein optimal height ceilings is considered a distance of two and a half meters;
2. Entrance door should have a width of 80-90 centimeters (at least);
3. The room must have at least one window hole;
4. A fan must be mounted in the window opening;
5. It is recommended to install a gas analyzer!

Important: the installation and installation of such a boiler is strictly prohibited in basement-type rooms, as well as near electrical appliances (the distance from them should be about 0.4-0.5 meters).

Conclusion of the coaxial system through the wall of a brick house

1. Installation and placement is carried out on concrete floor;
2. the chimney system should not have more than 3 branches, slopes or bending elements.

Thus, it is possible to install a floor-standing gas boiler with a coaxial chimney both in a private cottage and in a standard apartment. high-rise building located in the city.

Each heater requires the obligatory removal of combustion products. Especially urgent task the removal of smoke, soot and soot becomes for the owners country houses where there is no central heating.

IN Lately the coaxial chimney has become widespread, since it is the most efficient and practical device for a number of heating equipment.

One of the most affordable and reliable coaxial chimneys at the moment is the STOUT system. The equipment is designed to work with most modern gas boilers from European manufacturers. Elements are ideally suited to each other, do not require complex installation and tested for operating conditions in our country.

Warranty for all products - 2 years. The number of elements will allow you to assemble any smoke exhaust system that will work perfectly in your home. STOUT equipment is produced at the same factories where premium brands order goods, but it costs significantly less - there is no need to overpay for a big name.

What is a coaxial chimney

A coaxial chimney is a structure that consists of two pipes of different diameters inserted one into the other. Also inside the device there are partitions that prevent parts from touching. A coaxial chimney takes air to maintain combustion from the street, and not from the room. It is this design feature that allows the device to be operated without additional ventilation equipment. The main difference from a traditional chimney is shown in the figure:

Such equipment is installed in thermal devices equipped with closed combustion chambers, namely:

1. A gas boiler.
2. Gas convector.
3. Gas generator.
4. Gas column.

The maximum length of the device, as a rule, does not exceed two meters. The bulk of this type of chimneys is designed for horizontal installation and is led out through a hole in the wall of the building. A vertical coaxial chimney is more difficult to install, the length of the device pipe is much longer and it is brought out through the ceiling and attic.

Coaxial chimneys for gas boilers help solve many problems that remained relevant when using traditional devices. The main changes were:

1. A gas boiler with a coaxial chimney is a safer device, since the coaxial pipe cools quickly due to the influx of cold air through the outer pipe and thus the risk of ignition is reduced.
2. A coaxial chimney for a gas boiler increases the efficiency of the heater by heating the air coming from the outside from the exhaust gases.
3. A boiler with a coaxial chimney does not harm environment due to the complete combustion of fuel and the absence of harmful emissions into the atmosphere.
4. Gas boilers with a coaxial chimney are absolutely safe for humans, because the entire combustion process takes place in a closed chamber and does not disturb the comfortable microclimate in the room.
5. The small length of the device, which significantly saves space in the house.
6. A wide range of different power devices.

How is the installation of the chimney

Installation of a coaxial chimney can be done in two ways: vertically and horizontally. In both cases maximum length horizontal section cannot exceed 3 m.

Vertical installation is carried out only in cases where it is not possible to output the device through the wall. Most often this happens if:

• There is a window next to the device, at a distance of less than 60 cm;
• Insufficient street width.

A coaxial chimney for a gas boiler must be installed in accordance with SNiP, the main recommendations are:

1. A floor-standing boiler with a coaxial chimney is installed in rooms where it is not possible to provide a constant air supply.
2. The inlet pipe must be 1.5 m above the heater.
3. The diameter of the boiler nozzle must not exceed the cross-sectional diameter of the outlet channel.
4. The gas duct is introduced into the boiler room, where the turbocharged geyser or heating boiler.
5. The pressure of the gas that passes through the channel should not exceed 0.003 MPa.
6. The combustion products of the fuel that the column or boiler processes can be removed through the outer walls of the structure.

When placing the flue at a great distance from the outer wall of the building, a special extension is used to carry out the passage of the smoke channel.

• The height of the chimney must not exceed the height of the roof ridge.
• To rotate the structure of the smoke channel, knees are used with a rotation of the corresponding degree.
• It is not recommended to use more than two bends in one design. This will greatly complicate the operation and cleaning of the device.
• The elements are fastened using socket technology.
• It is forbidden to locate pipe joints at the point of passage through the wall.
• Each heating device - column, boiler, generator must be equipped with its own smoke channel, the use of combined gas ducts is prohibited, in order to avoid violation of the norms fire safety. However, the so-called. cascade connection devices.

If it is impossible to install a classic vertical chimney, chimneyless gas boilers are used for heating. For such heating equipment, a ventilated separate room for natural draft is not equipped.

Despite the name "chimneyless", there is a chimney in such boilers. Its role is played by a compact coaxial pipe, which provides traction and removal of smoke masses from the combustion chamber.

External outlet of the coaxial chimney

The design and principle of operation of chimney-free boiler equipment.

Chimneyless, like classic gas boilers, operate in heating mode - single-circuit, and even like water heaters (DHW) - double-circuit.

A distinctive design feature is the closed combustion chamber. The burner, through which the gas heats the water in the system, is located in a sealed chamber. Thus, carbon monoxide, soot and smoke from the combustion of fuel do not penetrate into the room, and the efficiency of the boiler increases.

Oxygenated combustion air enters the closed chamber through outdoor unit chimney. The air heated by the burner element heats the copper circuit through which the coolant flows. Then the "exhaust" air, together with the products of combustion of the fuel, exits through indoor unit coaxial pipe.

Scheme of operation of a floor coaxial boiler

Coaxial chimney is simple to implement. These are two coaxial pipes of different diameters, fastened together. Thus, the heated gas waste is cooled by the air entering the chamber, making the boiler fireproof and environmentally friendly for the residents of the house. Cooling the products of combustion, the air enters the combustion chamber already heated, which saves energy.

gas boilers high power to prevent lack of traction, they are equipped with deflectors that increase the air flow by one and a half times. If there is a possibility of wind blowing, a special wind protection block is installed at the pipe outlet.

Features of the installation of gas boilers with a coaxial chimney.

Floor standing chimney boilers for autonomous systems heating systems are installed in small buildings and in many apartment buildings or industrial premises.

Chimneyless gas boilers are installed on a special stand. If the boiler is controlled electronic board, then it is connected to electricity according to the rules for installing electric and gas equipment by specialists.

They are included in the heating system and gas mains in the same way as chimney gas boilers. The difference is the installation of a coaxial chimney.

Installation diagram of a horizontal coaxial chimney

Requirements for installing a coaxial pipe as a chimney:

1. The outlet of the chimney to the street passes through the wall horizontally. The length of this pipe section is no more than 1 meter.
2. The chimney is horizontal, but if horizontal chimney is not possible, a vertical chimney is used. The length of the vertical part of such a chimney is about 3 meters.
3. The outer part of the pipe is located no lower than 2 meters from the ground.
4. Distance from pipe to window or doorways is at least half a metre.
5. You can not place the outlet of the pipe under the window.
6. To prevent the accumulation of condensate liquid, it is installed at an angle of 3-5 degrees.
7. Observe the diameters of the pipes of the coaxial chimney and their ratio for fire safety.
8. The hole drilled in the wall for the pipe is lined with a heater made of non-flammable material.

Compliance with these requirements will make the operation of the boiler safe and efficient.

Chimneyless boilers - their pros and cons of operation.

The advantage of underfloor heaters equipped with coaxial pipe, - installation in the living room. To fit the boilers into the interior, the decoration of the walls and the junction of the chimney with the wall is selected.

You can learn more about coaxial chimneys and their use for gas boilers in the video below.

Coaxial boiler in the interior of the apartment

In addition, other advantages:

• simplicity and low cost installation;
• there is no need to install supply and exhaust ventilation;
• high power units of such a design that they heat large areas;
• some gas models equipped with convection holes, which makes it possible to heat the room without a radiator;
• long service life.

The disadvantages of coaxial boilers are in the smoke extraction system. The length of the smoke exhaust pipe is not more than 5 meters. During frosts, chimneyless boilers operate at high power, due to which more condensate forms in the coaxial pipe, which freezes and blocks the air supply and smoke removal. The blowing out of the chimney occurs if it is not equipped with a wind protection.

Chimneyless floor standing boilers- these are gas heating units equipped with a coaxial pipe that performs the functions of a chimney and supply ventilation

Source: kotlyhouse.ru

Floor-standing gas boilers with a coaxial chimney: price and types

When heating large-sized premises, fuel consumption and price are of particular importance. Currently one of the most economical options generators are floor standing gas boilers with a coaxial chimney. With their help, it is possible to provide heating of premises of any type and area, heating of water for household and other needs.

The principle of operation of a floor gas boiler

The fuel for such a generator is most often natural or liquefied methane or propane-butane. In the process of its combustion, a huge amount of energy is generated, which the generator redirects to the coolant.
The combustion chamber contains an element that ignites the fuel. All boilers of this type have a fuse that shuts off the gas supply when the ignition is turned off.

Gas boilers are divided into two types - floor and wall. Wall-mounted generators are more compact, due to which its power is reduced. Such boilers are suitable for periodic heating of small premises, such as greenhouses, small industrial buildings, Living spaces.

Floor gas boilers are characterized increased power and high efficiency. Such parameters are achieved primarily due to the larger combustion chamber and the body as a whole.

floor standing thermal generators used for heating or providing buckwheat with water industrial premises or residential buildings of a large area.

The principle of operation of a coaxial chimney

Any boilers that function by burning fuel produce a large number of harmful emissions into the atmosphere in the course of their work. The operation of such a boiler is impossible without the arrangement of a chimney pipe. At the moment, floor-standing gas boilers with a coaxial chimney are especially popular. This type of chimney has a double-circuit design, i.e. consists of two pipes, the smaller of which is inside the larger one. It provides two functions at once.
Smoke and other products of combustion exit the boiler through an inner pipe of a smaller diameter. A large chimney provides a constant supply of air for the combustion of the fuel. Thanks to such a chimney, the efficiency of the generator increases by 10-12%, the supply of air to the boiler and the removal of combustion products are localized in one place.

Both of these advantages are possible due to the transfer of thermal energy from the air flow from the boiler to air flow from the street. Heated air from the street increases the combustion time of a unit of fuel, thereby reducing its consumption. Combustion products, passing the way from the generator to the street, lower their temperature by an average of 10°C. Thanks to this, the outer part of the chimney can be made on the side of the room.

Types of outdoor gas boilers with a coaxial chimney

Gas floor boiler with a coaxial chimney can be convection and condensation. The principle of such division is determined by the completeness of the use of fuel.
Convection gas boilers are very common due to the fact that the average cost of such equipment is on average 20-30% cheaper than the second option. The boiler works at the expense of the lower heat of combustion. The term net calorific value refers to the amount of infrared energy that a unit of fuel emits without taking into account additional factors. The design of such a generator ensures that condensation does not form on the walls of all its parts.
Condensing boilers, in addition to the energy of fuel combustion, use the heat that forms during the evaporation of condensate. The design includes sections with a dew point - the temperature difference at which water in a gaseous state is converted into condensate. The body of such a boiler is much larger than a convection one, because in addition to the main parts, an economizer is provided in its design - a generator element made of straight or corrugated cast iron pipes on the walls of which condensation accumulates. Fuel consumption when using this element is markedly reduced.

The price of a floor-standing gas boiler with a coaxial chimney
As a rule, the chimney and boiler are purchased separately. average cost chimney, regardless of the configuration and the manufacturer's company, varies within 4 thousand rubles. Quite often, large companies selling heating boilers arrange promotions during which the chimney acts as a gift to the generator.
The generator itself will cost about 20-30 thousand rubles, depending on the power.

Fuel consumption of a floor-standing gas boiler with a coaxial chimney

For heating 10 sq. meter area requires 1 kW of power. Based on these data, it can be revealed that a generator with a capacity of 10 kW is enough to heat a room with an area of ​​​​100 square meters.

Fuel consumption depending on the power of the generator can be seen in the following table.

Based on these data, you can calculate how much fuel is needed to heat the room per month.

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Floor-standing gas boilers with a coaxial chimney: price and types

Floor-standing gas boilers with a coaxial chimney: price and types When heating large premises, fuel consumption and price are of particular importance. Currently one of the most economical

Source: heating.tv

Floor-standing gas boilers with a coaxial chimney - design features and practical application

The very word "coaxial" means "one in the other." For a chimney, this is the principle of "pipe in pipe". Such a chimney for a gas boiler is a double-circuit design - a pipe with a smaller diameter is placed in a pipe with a larger diameter. Inside, these pipes are interconnected using special jumpers that prevent their contact.

It looks like a coaxial device

In order not to bother looking for integral elements of systems gas heating: the corresponding pipes for the chimney and extensions, it is more expedient to purchase the whole set as a whole. Firstly, this should save a lot of time, and secondly, this kind of chimney, called coaxial, equipped with steel or plastic pipes, will surely turn out to be safer and more durable, because the details, ranging from tees, bends and ending with transitions and stainless steel flanges in the chimney, should correspond to each other as much as possible.

If you are not quite sure what kind of chimney pipe is required for your heating system, whether it be a gas boiler, fireplace, stove or column, it would probably be better to seek help from specialists. Those, having made an inspection and measurement of the premises, will pick up best option. And, importantly, they will help with delivery and installation (the services of such specialists, by the way, are provided in almost every store specializing in chimneys for gas boilers and related heating equipment).

In order for any heat generator (with the possible exception of an electric one) to work stably, the system must provide for the removal of gases generated during the combustion of fuel. In addition, as everyone knows, combustion itself (as a process) is possible only when a continuous sufficient supply of air is provided. Otherwise we have incomplete combustion fuel. How a coaxial chimney for a gas boiler really differs from a conventional chimney, we will consider in the article.

Installation of chimneys of this type is carried out, as a rule, with boilers that have a closed combustion chamber, these are usually floor (or wall) type devices located on any of the floors. The direction of the chimney is determined individually in each individual situation. The chimney is located both in a vertical and horizontal or inclined plane.

Note! For fire safety purposes, the chimney opening must be at least one and a half meters higher than the boiler. The hole itself should slightly exceed the diameter of the actual pipe. When bringing it out, it is necessary to slightly tilt the pipe (the angle is more than 3 degrees) to ensure the outflow of condensate. To prevent possible blockages of the air duct, the outlet is located no closer than one and a half meters from the ground surface.

How does a coaxial chimney look like indoors

In boilers with forced circulation, a horizontally located chimney is always used. If there is no (or perhaps difficult) possibility for the pipe to exit through one of the walls directly to the street (the reason may be the insufficient width of the street or closely spaced windows), then a vertical version of the coaxial chimney is used.

During installation, the so-called. coaxial not only elbows, but also flanges, clamps, adapters. In order to avoid violating the design of the room, you can buy decorative overlays by picking them up in style general interior. If it is necessary to lengthen the pipe, it is worth using only clamps, without using other improvised means such as sealants and adhesives.

This is that the air for an efficient combustion process is taken from outside (and not from the room). A simple stove takes oxygen from the room, which requires frequent ventilation. The principle of operation of coaxial chimneys is somewhat different - here combustion products enter the inner pipe, but the outer one serves as an influx of fresh air.

What does it give

This design immediately solves a number of problems inherent in conventional heaters and chimneys. We let you evaluate it.
The air coming from the outside comes already hot, because it is heated by the inner pipe due to the very hot combustion products passing through the pipe. This greatly reduces heat loss, resulting in both an increase in the efficiency of the entire system;
Increased efficiency will lead to complete combustion of natural gas. As a result, particles of unburned fuel will not be emitted into the atmosphere, which will increase the environmental friendliness of the boiler;
Of great importance is the fact that the pipe inside, when transferring part of its heat to the outer pipe, gives off part of the heat and cools down. This moment partially reduces the fire hazard;
All heating processes from the very moment of air intake to the removal of combustion products are closed - in the combustion chamber. Accordingly, there is no need to worry about additional ventilation, because neither smoke nor carbon monoxide should enter the room;
The presence of a wide variety in pipe sizes, this applies to both external and internal ones, makes it possible to choose a coaxial chimney for a gas boiler of almost any power;
Compactness allows you to save considerable space indoors;
Those who have dealt with such equipment note the ease of installation (this applies to both the boiler itself and the coaxial chimney). They also talk about the relatively easy operation and service of such a heating system.
Naturally, if frank mistakes are made in the installation of a coaxial chimney, you can not get its benefits. This also applies to safety and environmental friendliness. So the question of correct installation is very important.

Layout of coaxial chimneys

And now I propose to get acquainted with coaxial chimneys using specific examples.

Floor standing gas boilers with coaxial chimney

Floor-standing gas boilers with coaxial chimney - market analysis

Source: teplolivam.ru

What is a coaxial gas boiler - pros and cons

Content:
1. Installation of a boiler with a coaxial outlet

The constant rise in gas prices has made the efficiency of heating equipment one of the main selection criteria. Coaxial gas boiler, has a high efficiency up to 109%. Due to the special design of the combustion chamber and certain nuances of operation, it is possible to install coaxial-type boiler equipment in an apartment in a multi-storey building. The boiler is suitable for connection to any type of heating system.

Why are boilers called coaxial

This name appeared due to the peculiarities of the smoke exhaust system. A coaxial exhaust structure is mounted in the boiler device. The chimney performs two important functions at once:

• Removal of combustion products - the design of the chimney is a simple device, like a "pipe in a pipe". Through the internal cavity, combustion products are removed.
• The air supply to the burner device - the intake of air masses occurs through an external pipe. The air entering the boiler surrounds the inner chimney pipe, heated by the exhaust products of combustion, and is preheated before entering the burner, which increases heat transfer.

The boilers got their name due to the special design of the combined coaxial air supply and removal of combustion products, but the difference in the principle of operation (compared to the classic versions of heating equipment) is not only this.

The principle of operation of coaxial boilers

Coaxial gas boilers with a closed combustion chamber have a more accurate name - "condensing", reflecting the basic principle of operation. This equipment has a high efficiency of 108%, compared to classical heat generators, 92-96%. The structural differences are:

• Closed combustion chamber - a system of coaxial smoke removal of exhaust gases and air intake, prevents the combustion of oxygen from the room. Air intake and exhaust of combustion products is carried out through a horizontal chimney. This feature design, allows you to reduce the requirements for the room where the gas boiler will be installed.
• The use of heat from the exhaust products of combustion - in the heated air, there is a large amount of heat. The principle of operation of the boiler is based on improved accumulation of thermal energy from combustion products. Heat is extracted by the method of purposeful condensation of steam particles on the surface of a special heat exchanger.

The difference between coaxial boilers from others

There are several differences between a coaxial boiler and classic atmospheric versions of heating equipment.

1. Closed combustion chamber.
2. High efficiency achieved through maximum extraction of thermal energy in the gas combustion process.
3. Smaller room volume required for the installation of a gas coaxial boiler.

Boiler equipment can be placed in a room from 8 m². Allowed installation in the kitchen. bathroom (provided that the current SNiP allow). Boilers can be built into furniture or a special niche.

Coaxial heating equipment has several disadvantages associated with its operation. The disadvantages of coaxial boilers are:

• Coaxial models are recommended for connection to low temperature systems heating. It is under such conditions that the efficiency of the device will reach 108-109%. In the harsh Russian winter, it is not always advisable to install a coaxial boiler.
• Cost - the boiler design uses a stainless heat exchanger, automation, a condensing unit and many other modules that increase the cost of equipment. On average, the price of a boiler is 2-3 times higher than that of a classic heat generator.

Installation of a gas boiler with a coaxial outlet

The device of the heating system with a coaxial gas boiler, does not have complex scheme. Installation of all nodes is carried out within 2-3 hours.

The general device requirements are:

• Chimney connection - the pipe is mounted in accordance with the current SNiP and the manufacturer's recommendations. To provide good performance draft, it is forbidden to use more than two turning angles along the entire length of the flue system. The total length of the vertical chimney must not exceed 3 m.
• Minimum installation height - distance calculated from outer wall building. The requirements regulate that the head should be located at least 1-1.5 m above the ground.
• Condensate drainage system - during operation, the boiler uses targeted condensate formation. Waste condensate will need to be diverted from a special container to the sewer.
• The optimal conditions for installing a coaxial boiler are to install the equipment on the wall through which the chimney will be led out of the building. To ensure the best draft characteristics, the length of the chimney should be between 1-1.5 m.
• You can avoid icing by installing an insulated coaxial chimney. as well as a condensate collector.

Models of boilers with a coaxial chimney

To facilitate the choice, all presented models of heating equipment are divided into three categories according to the following criteria:

• Type of installation - the consumer is offered floor-standing coaxial gas heating boilers and their wall-mounted counterparts. Stationary models have great performance, but are inconvenient in installation and subsequent operation.
  Wall-mounted coaxial gas heating boilers are more popular due to their compact size and availability a large number various functions.
• The number of heat exchangers - a coaxial double-circuit gas boiler, runs on DHW heating and heating systems. Modern models have a built-in buffer capacity, providing almost instantaneous supply of hot water to the consumer.
  A coaxial single-circuit gas boiler, designed exclusively for heating, but has a higher power compared to a double-circuit analogue. If desired, after a slight modification, an indirect heating boiler is connected to the heat generator with one heat exchanger.
• Manufacturer - popular models are offered by the following companies: Buderus, Viessmann, De Dietrich, Baxi, Vaillant, Ferroli, Navien, Rinnai.

The standard of quality is the products of German manufacturers. French equipment has a simpler and more comfortable control, and Italian products are distinguished by an acceptable cost and at the same time wide functionality.

Boilers of the latest generation are equipped with weather-dependent automation, which increased efficiency and facilitated operation.

Calculation of power and temperature of a warm water floor

What is a coaxial gas boiler - pros and cons

An economical and efficient coaxial gas boiler, it is distinguished by good heat transfer, the principle of operation associated with the features of the design and device, and an efficiency of up to 109%. Equipment of this