Coaxial tube for gas boiler

Independent heating with the use of a gas boiler is possible only with proper removal of exhaust gases from it. But it is not always possible to install a pipe passing through the roof, so a coaxial chimney was developed for wall devices.

This made it possible to reduce the length of the chimney without disturbing the thrust, and also the removal of combustion products through the external wall of the building became possible. This device deserves to talk about it in more detail.

Purpose

The work of gas heating equipment should be organized in such a way that the resulting combustion products are effectively discharged outside, and there is also constant access of fresh air to the burner zone.

It is considered expedient today to install in multi-storey buildings a wall-mounted or floor-mounted domestic boiler for heating with a coaxial chimney, which makes it possible to solve this problem with little financial expenditure and re-equipment of the room.

According to the rules of fire safety, the exhaust of smoke through the ventilation channels in apartment buildings is prohibited. There are also problems with access to the required amount of fresh air needed for full combustion of fuel.

The purpose of the coaxial chimney is to successfully solve these two problems simultaneously. At the same time, its installation is simplified by the need to punch only one hole in the bearing wall of the building.

Design

What is a coaxial chimney?

This device consists of two circuits:

• the first one brings out the combustion products of gaseous fuel;
• the second is designed to supply the required amount of fresh air into the combustion chamber.

They consist of two pipes of different diameters, inserted one into another. Smoke is discharged through the central channel, fresh air flows through the gap between them.

If you look at the cross section of this chimney, we see two circles, between which there is a small distance, the value of which is constant along the entire length of the structure. The same scheme applies to bends and other fittings used during installation.

The main material for horizontal or vertical coaxial chimney is steel:

• galvanized - its price is the most affordable, however, it has a limited lifetime;
• stainless greatly increases the operational life of the device.

The best material for chimneys of this type is considered to be steel, which can resist acid-containing substances. This is directly related to the products of combustion of fuel, which in their composition have very aggressive chemical compounds. The latter can damage the unprotected surface of the structure.

What is coaxial chimney

Smoke extraction systems incorporate the following structural elements:

• coaxial tube;
• revision device, designed for maintenance of the chimney;
• condensate collection tank, generated by the passage of smoke through the system;
• coaxial pipe extension, the length of which should be no more than 3 m;
• tee, if you need to connect 2 devices;
• elbows and knees, required to connect the chimney to the boiler and docking horizontal and vertical sections;
• protective device and decorative covers, not allowing the wind to extinguish the flame;

Tip: if a horizontal installation of the chimney is used, add an electric exhaust fan to the system, ensuring stable draft in it.

Device advantage

Experts say good performance characteristics of such chimneys. They also provide a safe working environment for gas equipment.

Today there are a number of companies that specialize in the production of such products. Many of them supply their products to the domestic gas equipment market. Below we consider the positive sides of coaxial chimneys:

Installation

We recommend not to engage in the installation of gas boiler equipment in an apartment or a private house with their own hands. To do this, there are special certified professional companies that will not only install, but also take the equipment under warranty.

Below we consider the rules that must be followed when installing a coaxial chimney:

1. The instruction permits installation of pipes in a horizontal, vertical position and at an angle. In the first case, the installation should provide a minimum slope (from 3?) Towards the condensate collector.

Tip: this system requires a fan that can provide normal traction.

1. Vertical coaxial chimney for a gas boiler is used mainly when it is impossible to maintain the regulatory distances to gas pipelines, windows and other objects. It should be warned that such a system will require large financial investments.
2. The minimum distance from the ground to the exit of the chimney (when installed on the first floor) is 1-1.5 m. The chimney should also be located above the firebox also 1.5 m.
3. The installation of the chimney can be performed using no more than 2 swivel knees.

1. The distance to the window must be at least 600 mm (in all directions and planes), to the gas pipes - more than half the diameter of the chimney.

There are also other specific requirements that only a specialist can figure out, especially the many nuances when mounting condensate collectors and revision devices. We recommend to ensure the safe and reliable operation of gas heating equipment to entrust its installation to professional teams.

Conclusion

Independent heating makes it possible to independently regulate gas consumption and provide an apartment or house with high-quality heat.

A large role in this is played by the coaxial chimney, thanks to which the creation of systems was succeeded, the products of combustion from which are brought out through the supporting wall of the building. Work with gas equipment is considered dangerous, so trust their performance to professionals. The video in this article will help you find additional information on this topic.