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August 12, 2017 18:06

Installation requirements for coaxial flue gas boiler

Installation requirements for coaxial flue gas boiler

At arrangement of the heating equipment operating on gas, it makes sense to equip the coaxial chimney, which the installation will not cause difficulties.

Rules and regulations of the installation of any heating equipment, including solid fuel, require that the respective device chimney.

Its main purpose - is to ensure the necessary supply of oxygen, while the challenge of all the products of combustion.

chimney can only provide the necessary combustion of the coolant used in the boiler.

If the solid fuel boiler can be used in almost any type of chimney, the boiler that runs on gas, the optimal solution will be universal coaxial chimney.

Currently increasingly used a heating equipment, which is provided in the combustion chamber is closed.

This type of boilers can be installed in almost any building, including a wooden.

boilers designed for such standards and requirements do not allow to equip the classic extraction systems, which tend to take up much space.

In this case, may be installed coaxial chimney, which has a simple and compact structure.

There are certain requirements that must be done, if it is mounted coaxial chimney for gas heating boiler.


  • The principal features of the installation
  • Installation Requirements chimney
  • Tips and tricks

principal features

Classic Coaxial chimney is quite specific design.Any such chimney is composed of individual tubes, placed one inside the other, which have different diameters.

In the interior of the pipe does not come into contact with each other by installing special bridges along its entire length.


These jumpers provide not only the rigidity of the entire structure, but also give the whole system a certain strength.The pipes that have different diameters, perform specific functions.

Ta tube which has a smaller diameter, is responsible for removal of the combustion products of the boiler.

pipe whose larger diameter, in turn, ensures the inflow of a combustion chamber in the required volume of oxygen.

thus coaxial tubes allow both the supply air stream and out of the smoke chamber.

In this case, the air in the house does not mix with air masses inside the boiler.

It should be noted that a special tube coaxial with all its positive characteristics is not for all heaters.

For example, a solid fuel boiler, usually a combustion chamber is not gated, and thus, this tube in this case is not suitable.

This type of discharge the products of combustion systems for the boilers, which are closed type combustion chamber.

The biggest advantage of this product is the simplicity of the installation and subsequent operation.

addition, during installation it is not necessary to carry out work on the roof, so the pipe can be displayed by the window directly into the wall.

Installation coaxial tube completely eliminates the contact of air in the house and the products of combustion from the boiler.

The standard scheme

Also, the air, which is taken from the street, enters the chamber in an already heated state, which allows to significantly increase the overall efficiency.

coaxial pipe for a gas boiler is the optimal solution for any home, in addition, it is possible to build in a wooden structure.

for installation

Requirements Installation of home, including wood, heating equipment, which is provided with a closed type combustion chamber, the device requires a mandatory stand-alone heating system.

It has some differences from the system that is intended for solid fuel boiler, which is installed in most cases only in a private home.

current requirements allow you to set the gas boiler of this type, including in apartment buildings.

Under coaxial chimney for gas boiler developed certain rules and safety regulations, binding on everyone.

Chimney for sauna

Thus, the maximum permissible length draft tube of such a system should be on average up to three meters.Displays the main pipe on the street is to be made only in a horizontal position.

In turn, the length of the tube section, which should be in a horizontal position, must not exceed one meter.

In the case where the forced draft provided by the installation of additional fans, there is no need of installation of the vertical section of the coaxial tube.

outlet for coaxial pipe must be located at a distance of not less than one and a half meters from the boiler.

If necessary, make a tube of greater length, you should use only the standard extension cable prefabrication.

distance the outside of the coaxial tube from the base of the wall is chosen arbitrary value.

should also be compulsory to make a small slant horizontal runs of the pipe to the interior space of the chimney does not accumulate condensate.

diameter of the outlet in the wall of a chimney of a coaxial type should be slightly larger than the diameter of the pipe itself.

For more information about how to build a house or apartment coaxial chimney, described in the video, which is available below.


Installing chimney

order to independently mount coaxial chimney in the house under the gas boiler, do not need to have any special knowledge.

main advantage, which has a coaxial chimney, is the maximum ease of installation, as opposed to the chimney for solid fuel boilers.

All that is required for its arrangement - it is clearly appropriate to follow the recommendations and instructions as closely as possible to adhere to the current regulations and safety standards.

Mounting the chimney

Typically, coaxial chimney is mounted in conjunction with the boiler, but it does not matter.To start with all the rules set heating equipment itself.

Next on the surface closest to the boiler wall is marked outlet.Its distance from the unit should be at least one and a half meters and a diameter slightly greater than the diameter of the pipe.

should be firmly attached to the special extension cable taps the boiler.Fixing is carried out using special clamps.

outlet for coaxial chimney, which is located in the wall, it is mandatory to impose a non-combustible insulation.

Next is the installation of the horizontal part of the chimney.It must be possible to rigidly attach the wall surface by means of special brackets.

Thereafter, the horizontal section of the pipe is connected to the vertical.When installing this type of chimney you must make all connections tight and as airtight as possible.

on the outside of the chimney of the coaxial type is not necessary to wear additional protective elements in the form of umbrellas or deflectors.

For more information about how to install a chimney, described in the video posted below.


Tips and tricks

Coaxial tube has a specific construction and its installation should be done very carefully.

should not prevent the formation of defects and any damage, as it can occur internal depressurization, resulting in the boiler fails.

length, both horizontal and vertical section of this type of tube is chosen on the basis of technical specifications, it is recommended to take its minimum value.

great importance is the distance from the boiler outlet.The optimal value from half to two meters.

As practice shows, in compliance with all requirements of the installation, the room will be supported by the best possible living conditions.

In any case, prior to installation is recommended to get acquainted with the relevant requirements and rules of operation of the heating equipment.

coaxial chimney installation is done with a slope overlooking the pipe.If it is done in the direction of the street, then the image on the walls of the condensate will flow by gravity to the outside.


It should be noted that in this case the system can work effectively only when there is no outside sub-zero temperatures, since at the end of the pipe from time to time can form icicles.

They will complicate the work of the boiler, and reduce the value of its efficiency.Experts recommend making the necessary pipe slope directly towards the boiler.

In this case, necessarily require the installation of additional devices, which is called the siphon.

There is no need to hold additional insulation of the pipe of the coaxial type.

If you perform installation of a coaxial flue correctly and in accordance with conventional technology, the problems will not arise in the operation of heating equipment.