Chimney for a gas boiler in a private house

Do I need a chimney for a gas boiler in a private house? - Of course. Only in this case will the safety and good operation of the entire heating system be ensured.

The design of the flue system must be carefully thought out and installed correctly. Errors will entail insufficient traction, costs will increase, the output of combustion products to the outside will be incomplete. To minimize costs and increase the efficiency of the boiler, the advice of specialists should be taken into account when installing a chimney. In this article you will find comprehensive information on how to make a chimney for a gas boiler, and how to install it correctly.

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Why do you need a chimney?

The chimney is a system that provides the disposal of combustion products from the living room. If you correctly make a chimney for a gas boiler, then you can achieve optimal operation of the entire heating system:

1. Ensure high productivity of the gas boiler (increase the efficiency level);
2. To increase the efficiency of the heating system;
3. Secure all residents of the house;
4. Provide comfortable heating of the premises;
5. Use the boiler for a long time without any problems.

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Features of the chimney device

Regardless of the type of chimney, it includes the following elements:

• Smoke exhaust pipe;
• Passage branch pipe;
• Adapter for connecting the boiler pipe to the chimney;
• Mounting brackets and clamps;
• Telescopic tubes;
• Tee with fitting for condensate drain;
• Bends;
• Cone-shaped tip.

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Which chimney is better for a gas boiler?

Chimneys for gas boilers with their own hands can be made of different materials. Consider the most common solutions. Thus, you can choose for yourself the best option.

Brick chimney

A chimney made of such material is not a construction of the past, but even the century before last. Its features include the following factors:

• Such a system has a complex structure, its installation takes a lot of time and leads to significant financial costs for its arrangement.
• In addition to all this, the brick chimney is inferior in many significant indicators to modern smoke exhaust structures.

Important! Nevertheless, a brick is a durable, environmentally friendly material, the chimney from which can be used for decades.

Galvanized Steel Chimney

One of the best and most effective is considered to be a sandwich pipe construction. Today, manufacturers offer a wide range of chimneys that differ in such properties:

1. Such a smoke exhaust system is resistant to aggressive external environment and various kinds of mechanical load.
2. It has a simple structural structure: it consists of two pipes of different diameters, one of which is inside the other. The gap between them is filled with non-combustible basal wool.

Important! The insulation thickness is 40-50 cm, and the filling density is 120 kg / m3.

Coaxial chimney for gas boiler

Such a flue design is an excellent modern option with a presentable design and good performance:

• It is made according to the “pipe in pipe” scheme.
• It is used to work with gas boilers with a closed combustion chamber. Such equipment draws air for burning gas from the street, and not from the room, which is heated.
• The air supply is carried out using an external pipe, which is laid through the outer wall of the building.
• Smoke with impurities is discharged through the inner pipe.

Important! Such a device eliminates the need to install an additional ventilation system.

• Due to the specific shape of the coaxial chimney, the possibility of condensation on its walls is excluded, which is especially important for gas-fired heating systems.

Ceramic chimney:

• It is a simple, reliable, fireproof, easy to install and affordable design.
• Such a chimney consists of a ceramic pipe wrapped in insulating material and placed in an expanded clay concrete shell.

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How to install a chimney on a gas boiler? Primary requirements

Regardless of the chosen design and material, the arrangement of the system must be carried out strictly according to certain rules for installing a chimney for a gas boiler.

Consider the most important of them:

1. The maximum allowable slope of the sections of the flue system should not exceed 30 degrees.
2. Side branches should not be more than 100 cm.
3. The flue system should be without ledges.
4. Cross sections are completely excluded.
5. There can be no more than 3 knees.
6. Rounding should be a radius not less than the diameter of the pipe used to remove smoke.
7. To clean the system and discharge the condensation fluid in the corners, an inspection hatch must be installed.
8. If a rectangular chimney is being constructed, then it should be checked so that one side does not exceed the width of the other twice. In simple words - it is impossible for the structure to have an excessively elongated shape.
9. At the bottom of the pipe, a revision and a drip should be arranged.
10. Even insignificant deflections of structural parts are unacceptable.
11. When building the chimney, one link must be worn on the second, at least half the diameter of the pipe.
12. Gaps between chimney elements are not allowed.
13. In areas where the chimney passes through ceilings and partitions, the presence of any joints is excluded.
14. All elements of the system should be connected as tightly as possible.
15. The minimum allowable inclination of the chimney in relation to the heater is 0.01 degrees.
16. From the inside, the pipes should have as smooth walls as possible. Any kind of roughness is extremely undesirable.
17. The horizontal parts of the chimney cannot be a total length of more than 300 cm in the case of houses under construction and 600 cm for already constructed buildings.
18. The permissible distance between the surfaces of flammable materials and the pipe is at least 250 mm, between non-combustible materials and the pipe - 50 mm.
19. In places where a chimney crosses partitions and ceilings, it is necessary to make high-quality thermal insulation.

Chimney height

Separately, attention should be paid to the requirements for the height of the chimney in relation to the ridge of the roof structure. It is necessary to bring the chimney out of the area of ​​the wind support and install it at a height of:

1. Above the imaginary line laid from the roofing ridge down to the horizon at a slope of 10 degrees, if the horizontal distance from the ridge exceeds 300 cm;
2. At the same level with the ridge, if the chimney is located at a distance of 150-300 cm from the ridge;
3. Not lower than 50 cm from the roof ridge, if the horizontal distance is not more than 150 cm.

Important! The chimney should be above the adjacent roof sections by at least 50 cm. In the case of a flat (combined) roof, this figure must be increased to 200 cm.

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How to make a chimney for a gas boiler in a private house with your own hands?

Using the example of the construction of a “sandwich” system of pipes, we consider the procedure for arranging a chimney. The installation of the chimney for a gas boiler can be carried out in two ways - in the house and beyond.

Installation of a chimney of a gas boiler outside the building:

1. Connect a feed-through element to the heater pipe, which is designed to be routed through the wall.
2. Mark the surface of the wall based on the size of the passage element. Cut out the opening.
3. Take the flue pipe out of the room.
4. Carefully isolate the hole and the pipe passing through it.
5. Attach a tee with a revision to the pipe. Put a cap.
6. Start building the chimney, connect new links until you reach the required length.
7. Install a cone-shaped tip to the pipe. It will protect the system from wind and rain.
8. Use brackets to secure the structure to the wall.

Important! The spacing of the fixation elements should not be less than 200 cm.

9. All joints of the structure should be strengthened with clamps. Pull them with wire or bolts.
10. Paint the chimney with a special paint composition that is resistant to temperature extremes. Thus, you will provide the material with proper rust protection.

Installation of a chimney for a gas boiler inside the house:

1. First of all, holes should be marked in the ceilings and roof for the pipe.
2. Having checked the dimensions of the pipe with marks, make an opening for the chimney.
3. Connect the adapter adapter to the nozzle of the unit.
4. Install revision and tee.
5. Start building up the chimney. In places where the pipe crosses the ceiling, use a special protective pipe.
6. Put a sheet of stainless steel on the chimney. Cut a hole in the sheet in advance, slightly larger than the diameter of the pipe. Such a sheet should be installed on both sides of each floor.
7. Strength joints reinforce with clamps.
8. If necessary, attach the pipe to the attic beams. To do this, use brackets and wall clamps.
9. Install a cone-shaped tip to the chimney outlet.

Important! Brackets should be installed every 400 cm, and wall clamps - every 200 cm.

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Installation of a chimney for a gas boiler in a private house. Construction insulation

At the points where the elements of the chimney are in contact with flammable materials, it is necessary to equip reliable thermal insulation.

Procedure:

1. It is necessary to cover with basalt cotton wool with a foil layer through passage.
2. The insulation should be strengthened with fireproof mastic.
3. Additionally, use mineral wool around the perimeter of each opening, in ceilings and partitions.

Important! At the end of the installation of chimneys for floor gas boilers, be sure to make sure that every joint in the system is completely tight. To do this, apply a simple soap solution to the seams. If soap bubbles appear, then this indicates a violation of the tightness of the system. Correct all problems as soon as possible.

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Stock footage

For the quality of the heating system, you should take care of the chimney for a gas boiler in a private house. How to properly do all the installation work is described in this article. Given all the requirements, and knowing how to install a chimney, work can be done independently. Use only high-quality and reliable materials, and be sure to carefully check the tightness of the system. Information from the article will help you do everything right.