Chimneys for a gas boiler in a private house varieties and features of the device

Few things are more crucial to maintaining a warm and comfortable home than a dependable heating system. Chimneys are essential for the safe and effective operation of many gas boilers in homes. The key to making wise decisions is knowing the various kinds of chimneys available for gas boilers, whether you’re building a new house or replacing your old heating system.

Because of their dependability and efficiency, gas boilers are a common option for heating private residences. But in order to guarantee safe operation and stop the accumulation of dangerous gases like carbon monoxide, adequate ventilation is necessary. As the main way to expel these gases from the house, chimneys are an essential part of any gas boiler system.

The traditional masonry chimney is one of the most popular chimney designs used with gas boilers. These chimneys, which are made of stone or brick, have long been a mainstay of residential heating systems. Although they are very durable and offer good draft, they also need to be maintained on a regular basis to stay in good working order.

Prefabricated metal chimneys are another option on the market for homeowners seeking a more contemporary chimney. These chimneys come in a range of sizes and configurations to accommodate various heating systems and home designs. They are made of stainless steel or other heat-resistant materials. Prefabricated chimneys are frequently less expensive than traditional masonry chimneys and provide an easier installation process.

Whichever style of chimney you select, ensuring optimal performance and safety requires proper sizing and installation. Oversized chimneys may result in excessive heat loss and wasted energy, while too-small chimneys may cause poor draft and inefficient combustion. For your particular heating needs, it is imperative that you collaborate with a qualified HVAC professional to determine the ideal chimney size and configuration.

Chimney Type Features
Masonry Chimney Built with bricks or stones, durable and traditional.
Metal Chimney Constructed from stainless steel or other metals, easier to install and less maintenance.
Contents
  1. What it"s for
  2. Building Regulations
  3. Gas boilers without traditional chimneys
  4. Gas boilers without chimneys
  5. Varieties of chimneys
  6. Metal variants
  7. Ceramic varieties
  8. Coaxial chimney
  9. Installing a sandwich chimney
  10. Principles of the device of the heating boiler chimney
  11. Installation in a private house
  12. Coaxial chimney for wall placement ↑
  13. Gas boilers without a chimney
  14. Connection of the chimney system to the boiler scheme of the workflow
  15. Rules for installing a chimney for a gas heater
  16. Manufacturing and installation of the chimney with their own hands
  17. From what materials it is better to make
  18. Diagrams and drawings
  19. Calculation of dimensions
  20. How to check and adjust the draught in the chimney of a gas boiler
  21. Why the boiler blows out and how to eliminate it
  22. Video: how to check the draught in a gas boiler
  23. Types of pipes for heating boilers
  24. Metal, ceramic or coaxial chimney
  25. What to do if the boiler furnace blows out
  26. Precautions and tips for operating gas boilers
  27. Chimneys and variants of materials for their device
  28. Galvanized pipes
  29. Asbestos-cement pipes
  30. Brick chimney
  31. Protective sleeve
  32. Furanflex
  33. Stainless steel
  34. Chimney insulation.
  35. Some findings and conclusions
  36. Installation of the chimney according to the rules
  37. Stages of chimney installation
  38. Internal design of the chimney
  39. Arrangement of the external chimney
  40. Material requirements
  41. How to check the draught in the chimney of a gas boiler
  42. Chimneys for units with closed combustion chamber
  43. Choice of material
  44. Steel chimneys single-walled, double-walled (sandwich)
  45. Ceramic chimneys
  46. Types of modern chimneys
  47. Video on the topic
  48. How to choose a chimney for a gas boiler and do not make a mistake.
  49. Chimneys for gas boiler / Which chimney to choose? #chimney
  50. Gas boiler and chimney in the house. Placement of a wall-mounted boiler. Coaxial chimney into the shaft. Installation.

What it"s for

Gas is actively oxidized in the combustion chamber, releasing a great deal of heat that is required to heat the house as well as H2O (water vapor), N2 (nitrogen), and CO2 (carbon dioxide). Incomplete combustion results in the addition of the following: Hydrogen (H2), carbon monoxide (CO), and leftover methane (CH4)

It is significant that the butane, propane, and methane found in our homes are not pure; instead, they contain impurities such as hydrogen sulfide and ash, which contribute a variety of chemical compounds, including sulfuric acid, to the combustion products. Just this entire set of parts needs to be diverted from the combustion chamber outside the house safely and continuously so that they never enter the residential area.

Operation principle of the smoke exhaust duct

Along with the automatics, the chimney really determines the occupants’ safety in addition to the gas boiler’s quality. Only materials that have been tested and approved should be used to make smoke exhaust ducts, and all regulations and guidelines must be strictly followed.

Fresh air with a fresh supply of oxygen enters the chamber in place of the discharged combustion products, making boiler maintenance impossible without it.

Building Regulations

SNiP 2.04.05-91, DNP B 2.5-20-2001, SNiP 42-01-2002, and SP 7.13130 must all be complied with by chimneys. Never use anything that hasn’t received certification.

Fundamental requirements for chimney fire safety:

  • The cross-section of the chimney must be selected according to the boiler output;
  • The chimney must not deviate from the vertical by more than 30 degrees;
  • The thickness of the walls of the chimney – not less than 6cm for heat-resistant concrete, not less than 12cm for brick and is not standardized for sandwich and asbestos cement;
  • The length of the branch (horizontal section) of the chimney should not exceed 1m:
  • The minimum distance between the chimney and walls made of combustible materials is 250mm, and 50mm for non-combustible materials. In places where the chimney passes through walls and partitions it is necessary to install quality thermal insulation;
  • The diameter of the chimney channel is chosen equal or larger than the boiler outlet;
  • The air in the system should move at a speed of 15-20m/s;
  • The distance from the hot surface of the channel to the wooden elements of the flooring should be more than 13cm for concrete, brick and sandwich and 25cm for the pipe made of ceramic or asbestos cement;
  • At the base of the chimney it is necessary to organize a spigot for condensate removal;

Requirements for draughts:

  • The chimney for gas boilers should not be lower than 3m in height (recommended 5m);
  • Height of pipe above the roof:
  1. flat roof – up to 500mm;
  2. in line with the ridge at a distance from it by 1.5-3м;
  3. at the level of an imaginary line drawn from the ridge at an angle of 10 degrees to the pipe, when the distance between the pipe and the ridge is more than 3m;
  • The permissible radius of pipe curvature in the system is equal to the diameter of the product;
  • Cleaning pockets (revisions) are obligatory;
  • The chimney should not have narrowings and curvatures.

It should be remembered that there shouldn’t be more than three turns in the chimney system. If not, there is a dramatic drop in the draught.

You are already aware of the negative effects of inadequate draft proofing.

Gas boilers without traditional chimneys

Apartments can benefit from gas heating boilers without the need for conventional chimneys. These units feature a closed combustion chamber and an integrated carbon monoxide removal system. Since the exhaust gases from the furnace are removed by a unique turbine operating in forced mode, these boilers do not require a chimney with a natural draught. For these gas boilers, the flue system can be composed of polyvinyl chloride with an arbitrary number of turns; verticality observation is not required. An aesthetically pleasing coaxial chimney is arranged and led outside through a hole in the apartment wall.

Guidelines for chimney installation in respect to the building’s facade

When selecting a chimney for a gas heating boiler, pay close attention to the specifications of your appliance and the rules that apply to chimneys. This will ensure that your gas equipment operates smoothly and that you are safe.

Gas boilers without chimneys

The invention of chimney-free gas boilers is an example of innovative technology in this field. There are notable distinctions between how these systems operate and how traditional gas boilers operate. Their primary advantage is that they don’t have a conventional chimney.

The combustion products from any heating system must be released into the outdoors. distinct variations in chimney design. The use of PVC pipes (for "exhaust" gases at low temperatures) with an unlimited number of turns is permitted by the ultra chimney system. Additionally, the structure itself is not limited to a vertical placement.

Any temperature range is suitable for the boiler to operate in. Its operation suggests that liquefied and natural gas may be used. The boiler will automatically shut off if there are even the smallest operating malfunctions.

Varieties of chimneys

Know the different types of chimneys available for floor gas boilers before making your selection. The popularity of brick models has declined over time. They have a large footprint and require intricate installation. Many gas heating owners choose more contemporary solutions over brick buildings.

Setting up the chimney for wall and floor boilers

Metal variants

Models made of stainless steel are among the most popular kinds. Their durability and resistance to corrosive elements are regarded as advantages. These kinds of mechanisms are sandwich systems consisting of trunk lines with varying diameters. Insulation material fills the spaces between them. These models have a contemporary appearance and are very dependable.

Steel construction is put together using a variety of components.

The construction’s dependability is guaranteed by its multi-layer sandwich panels and thermal insulating qualities. These products hardly ever produce condensate. It is necessary to follow certain guidelines when installing these products:

  • the first elbow, which is fixed to the heater, should be without insulation;
  • the diameter inside the structure depends on the type of gas equipment;
  • When assembling the upper part should be installed on the lower part from above, which will allow to lead the condensate outside;
  • heat-resistant sealant is used to connect the elements.

Product structure for sandwiches

Sandwich constructions have a strong resistance to fire. There is no heat in the surrounding components.

Ceramic varieties

Ceramic products are robust, easy to use, and fire-safe. They are distinguished by a simple apparatus. The chimney is composed of a mineral wool-wrapped ceramic pipe.

Ceramic installationinstallation

A system like that is regarded as robust. It is distinguished by its resistance to harsh chemical substances and high temperatures. Ceramic products must by definition have condensate collectors. The features of the ceramic chimney are as follows:

  • The pipe consists of individual elements that are connected by a special mastic;
  • insulation is made of mineral wool;
  • The casing is made of concrete blocks with ventilation holes.

The ceramic device’s structure is depicted in the diagram.

The insulation and concrete surface are separated, which is essential for ventilation and moisture removal. Sometimes people use gas boilers that don’t have chimneys. Small diameter ducts are used to remove smoke and supply air at the same time.

Coaxial chimney

For gas boilers, you can purchase a coaxial chimney, which has superior design and performance characteristics. This kind of construction is done in accordance with the layout of one pipe inside another. may be selected for boilers that have a closed combustion chamber. The air intake of this kind of device comes from the street. An external pipe that goes through the exterior wall is used for air supply. The inner pipe is used to release exhaust smoke. There is no requirement for an additional ventilation system when installing such equipment. The coaxial chimney’s design prevents condensate from building up on the walls.

Characteristics of coaxial architecture

The equipment of the coaxial type has the following features:

  • Increased performance of the heating system;
  • complete safety;
  • If the size of the pipe is less than 3 meters, the boiler performance increases due to the increased draft;
  • There is no need to touch the roof for installation of such a construction.

One characteristic of this variant is its ease of installation.

The boiler can be placed in the kitchen, pantry, or basement if it has a coaxial design.

Efficient heating is essential in private homes, and selecting the right chimney for a gas boiler is critical. Gas boiler chimneys are available in a variety of styles, each with unique features and purposes. Every choice has specific benefits and things to consider, whether it’s a metal flue, a balanced flue system, or a traditional masonry chimney. The choice is influenced by various factors, including the type of fuel, the design of the home, and local laws. Ensuring safety and maximum performance requires proper installation and maintenance. Comprehending the various types and attributes of gas boiler chimney alternatives enables homeowners to make knowledgeable choices that maintain their residences secure and comfortable all year round.

Installing a sandwich chimney

Punching a hole in the outer wall and getting ready to lay the horizontal section is the first step in installing the attachment structure. When designing an opening in a combustible-material house, consideration is given to the fire indentation (38 cm from the wooden wall’s edge to the sandwich’s inner pipe) and the placement of the passage unit’s flange, as seen in the picture.

Note: The fire separation device is not necessary for non-combustible structures composed of bricks and foam blocks. A segment of the gas duct is placed into the gap created by the metal sleeve, and the seam is sealed with an inflammable substance.

The following is the order in which the modular sandwich installation and gas boiler connection are completed:

  1. Assemble the lower part of the attached chimney, including 2 tees and condensate drainage section. Attach the horizontal section going into the opening.
  2. Try the assembly to the wall and determine the place of mounting the support pad. Fasten it and install the lower section by driving the pipe into the wall. Observe the vertical by controlling the position of the assembly with a construction level.
  3. Having fixed the lower part of the gas duct, install the vertical section. Connect the straight sections in such a way that the shell of the upper one is put on the lower one, and the gas pipe, on the contrary, is inserted inside (assembly "by condensate").
  4. Fixing of the wall chimney should be carried out at an interval of not more than 2.5 м. Brackets should not fall on the joints of the sections.
  5. Route the horizontal section of the sandwich to the gas boiler and put on the adaptor. Fasten the flue duct with clamps to the building structures with a maximum pitch of 1.5 м.
  6. Connect the heat generator to the chimney with a piece of single-wall stainless steel pipe.

Remind yourself. Install metal flanges on both sides and use basalt fiber to seal the space in a wooden house between the intersecting pipe and wall ends.

There’s no need to smear sealants at the joints—straight sections are just inserted into each other and secured with clamps. Shorten the bottom end of the section where the insulation is flush with the metal linings if trimming is necessary. On the upper cut of the chimney flue, a protective cone is installed.

An interior installation detail

Similar procedures apply when laying smoke exhaust ducts inside buildings; the only difference is that you may have to pass through the buildings twice or even three times. Everywhere, the same guidelines apply to the placement of partitions where combustible floors and walls meet. Lastly, as demonstrated in the video, the roof in the pipe passageway needs to be carefully sealed.

Principles of the device of the heating boiler chimney

Adhering to the guidelines for installing smoke output channels can contribute to guaranteeing a strong and, above all, continuous draught. In the event that the chimney is installed improperly, the boiler will not operate at maximum efficiency and the draught will decrease. The most dangerous outcome of improper chimney connections is known as "overturning of the draught," which occurs when harmful gases enter the home instead of exiting it through the street due to wind or high humidity. Thus, the chimney’s device needs to fulfill certain requirements.

Adding more than one boiler to the chimney system is not permitted. In this instance, pipe alignment is useless because combustion products will still enter the structure.

The chimney must be installed completely vertically, with a minimum height requirement of five meters. Greater heights result in stronger draughts in structures. There are instances when the chimney device has 45-degree sloping sections. Thirty degrees per linear meter is the maximum vertical slope that can be allowed in the pipe.

A horizontal pipeline segment up to two meters in length is used to connect heating boilers to the chimney. The horizontal section’s slope cannot be less than 2%. There needs to be a vertical pipe that is at least one meter long before the horizontal portion. In the event that installing a vertical outlet pipe is not feasible, as is the case with wall-mounted boilers, a horizontal connection is used to connect the main flue pipe. The boiler draught will be better if the chimney construction has fewer bends.

The way a solid fuel boiler’s chimney base is arranged suggests that specific inspection hatches are there to make cleaning the pipe easier. There are some contemporary gas boiler models that don’t need inspection hatches.

The draught force depends on the chimney being positioned precisely vertically.

Very helpful advice! Coaxial chimney connections are permitted in a horizontal plane. Their apparatus presupposes a specific incline, adequate to allow condensation to drain into the roadway. When utilizing a coaxial chimney, the smoke outlet needs to be placed 60 centimeters away from the windows.

If the finish is made of non-combustible material, the distance between the connecting pipe and the wall or ceiling surface is 50 mm. There is an additional 250 mm between the wall and the chimney if the wall cladding is composed of combustible materials.

Tees on the gas pipe are mounted in the base of the vertical chimney trunk when stainless steel structures are used. Tees with varying slopes (87 degrees, 45 degrees) are also utilized for chimney maintenance and ventilation. Tee revisions with plugs are used to remove soot from the chimney and make repairs easier. The chimney should be elevated well above the common hood if it has an exit to the roof, as is typical with ventilation pipes.

In the event that connecting the chimney to both gas and solid fuel boilers is required, these guidelines are taken into consideration.

Any chimney installation requires careful attention to detail, especially in the sections that pass through roof slabs or walls. Flexible aluminum roof penetrations are used for these sections, and they also have the benefit of providing a sealing effect.

Installation in a private house

Find the chimney channel’s location before beginning the installation. Placement may consist of:

  • internal, i.e. in the house;
  • external, that is outside the house, which implies the presence of insulation, which does not allow freezing of the channel.

Think about a few different locations inside the home.

Coaxial chimney for wall placement ↑

Coaxial wall construction is thought to be the best option. Sandwich pipes and two-circuit schemes are comparable, but the space between the two pipes is not insulated. The "exhaust" gas exits through this opening while fresh air is drawn in. Because the air from the outside heats up as it travels through hot, exhaled smoke to reach the combustion chamber, this design improves the efficiency of heating equipment.

The setup process for these systems is very easy.

A pass-through spigot connects the smoke exhaust pipe to the boiler after it is led out through the wall.

The pipe’s outlet opening is marked on the wall at the boiler’s location, more than two meters above the ground. Since non-combustible insulation is required to cover the hole in accordance with safety regulations, its diameter should be marginally greater than the chimney’s outer diameter.

Deflectors and other extra components cannot be installed on the head of the coaxial structure.

Gas boilers without a chimney

This is by no means a typical gas-fired heater, and its greatest asset is most likely the fact that it does not have a conventional chimney. Of course, the combustion products will need to be taken outside, regardless of the heating system. The creative system assembles the outlet channel out of plastic pipes. It’s not necessary that it be installed precisely vertically in this instance. Furthermore, there is no cap on the quantity of turns. In addition to natural gas, the heating boiler can run on artificially liquefied gas. Any malfunction results in the heating system shutting down automatically.

Connection of the chimney system to the boiler scheme of the workflow

The primary technological moments are utilized to carry out the internal arrangement of the chimney design.

The style and form of the home’s roof determines the height of the chimney’s outer section.

For the system to work as it should, the rules have to be strictly followed.

  • markings are applied to the floors in accordance with the approved plan of the chimney. After checking that the markings are correct, holes are cut for the flue outlet;
  • The connection of the gas boiler branch pipe with the adapter is performed;
  • connection of the tee and revision is carried out, the main brackets for fixing the gas pipes to the wall are installed;
  • the chimney pipe is mounted directly. Knees are used to increase the height;
  • On the slabs are installed spigots for the passage of the chimney through them;
  • the other wall fixing elements are assembled. The step between wall clamps is 2 meters, between brackets – 4 meters;
  • The chimney device is completed with a special tip, usually made in the form of a cone. The header protects the chimney from precipitation;
  • the optimal operation of the system is influenced by how high the chimney is above the roof. The height of the chimney above the adjacent part of the roof is at least 50 cm. In the case of flat roofs, a height of 200 cm or more is taken.

The solid fuel or natural gas-fired boiler’s heating system device initially poses a risk. A home emergency may result from mistakes made in the installation or selection of chimney pipes. Seeking professional assistance makes sense if there is any doubt as to whether all of the boiler heating system’s calculations were done accurately.

Rules for installing a chimney for a gas heater

An appropriate exhaust system is essential for a gas water heater to operate safely. Use chimneys for the column that direct combustion products into the chimney or into the atmosphere. Use the following kinds of pipes for the exhaust gas output:

  • corrugated pipe – easy to install, the flexibility of the material allows you to
    pull it to 2-3 m in length, as well as extend it by connecting several sections of corrugation;
  • Aluminum chimney – easy to install, resistant to condensation, needs additional thermal insulation;
  • coaxial chimneys – the price of such systems can be reduced due to the possibility of outputting the pipe through the wall. This reduces material consumption and installation costs. The main advantage of such a chimney is that in the process of operation of all equipment does not involve air from the room.

Suggestions regarding the Gas Heating Installation

The following are the primary prerequisites for installing flue pipes for gas stoves:

  • The operation of appliances is prohibited without a chimney securely fixed in it;
  • The draught inside the chimney system must be constant;
  • pipe material should be non-flammable, resistant to corrosion, condensate and high temperatures;
  • The outer section of the chimney must be vertical;
  • The design must be airtight to avoid the entry of carbon monoxide into the room;
  • the exhaust pipe should be mounted in an open place for quick troubleshooting, if necessary;
  • the chimney should be located above the roof level by at least 0,5 m;
  • It is strictly forbidden to use for the removal of combustion products ventilation systems, the space between floors, attics.

Manufacturing and installation of the chimney with their own hands

From what materials it is better to make

The three most common materials used to construct chimneys in private homes are ceramic, steel, and brick. I advise you to familiarize yourself with the benefits and drawbacks of each material before making a decision.

Brick, advantages and disadvantages

Affordability, great strength, inflammability, resistance to high temperatures, and relative ease of repair;

A professional stove operator is needed for installation due to the hygroscopic, bulky, complex construction and the additional foundation required. Additionally, the brick does not adequately provide the gas flow required for a gas boiler. By sleeving, or inserting a steel pipe inside the brick channel, the issue is resolved.

Ceramics’ benefits and drawbacks

Enhanced durability and heat retention, exceptional fire resistance (able to tolerate temperatures as high as 1200C), and comparatively simple installation.

High fire resistance, smooth inner walls, high heat conductivity, and ease of installation.

When it comes to ferrous metals, which are prone to corrosion, stainless steel is an expensive material.

The conclusion is obvious: using a ceramic chimney with pipes buried in shafts is the best option when building a residential home. Stainless steel pipes can be of assistance in setting up a smoke extraction system in a home that has already been constructed.

Diagrams and drawings

Figure 2: System’s general drawing

Fig. 3. Brick chimney system variations:

Figure 4: A solitary metal chimney

Sandwich chimney in Figure 5:

Fig. 6. Coaxial pipe system:

Figure 7. Ceramic fireplace:

Calculation of dimensions

The computations for the chimney system’s components come down to figuring out the following fundamental parameters:

  • The cross-sectional area of the main pipe;
  • Height of the flue duct.

Coordinating the acquired data with the SNiP tables and the details found in the boiler manual is always required. Remind yourself that the pipe’s height should be at least three meters, preferably five.

The appropriately chosen pipe diameter determines the draught.

Let’s look at two methods for figuring out pipe diameters for gas-fired boilers:

You multiply the heater power (in kW) by 5.5. Use the nameplate capacity for computation rather than the thermal capacity. The rated output is added together when two units are connected to the same chimney.

We determine the inner diameter of the pipe to be at least the diameter of the boiler outlet after taking this measurement.

How to check and adjust the draught in the chimney of a gas boiler

A drop in pressure occurs in the area where fuel is burning, causing a draught. The removal of combustion products through the flue duct causes a reduction in pressure. In the context of this article, it means that the draft drives fresh air into the combustion chamber, which experiences a drop in pressure as a result of the gas’s combustion products being released.

Draughts are a sign that the equipment in the chimney is operating correctly and that it was built and installed correctly. The absence of draught may indicate, either directly or indirectly, that the equipment and chimney system require preventive maintenance or repair.

Anemometers are specialized instruments used to measure the speed of air flow in chimneys.

The level of draft can be checked using the following techniques:

  • visual inspection – in the room where the heating equipment is located, there should be no smoke;
  • Use of improvised means, e.g. a sheet of paper. It is brought to the inspection hole. If there is a draft, the sheet will be deflected towards the opening;
  • Measurement with a special device – anemometer. It is used to check the air velocity.

The last method is the best to monitor the draft because it is the only one that will display the precise value. The ideal range for the flue gas velocity when measuring the natural draught is 6–10 m/sec. The value comes from "Design of autonomous heat supply sources," SP 41-104-2000.

Rebuilding the chimney based on a larger cross-section chimney will be required if lowering the level of draught is necessary. It is advised to use a steel cable with a rinsing nozzle to mechanically clean the flue duct in order to enhance the draught. Additionally, it is advised to inspect the quality of the installation joints.

The only other option if this doesn’t work is to replace the chimney using an approximate cross-sectional calculation. Reducing or eliminating the number of turning elements is preferable.

Why the boiler blows out and how to eliminate it

The primary cause of the boiler’s burner blowing out is the result of a reverse draught brought on by chimney issues.

Prior to initiating any actions, make sure the chimney is tall enough to clear the ridge and that a deflector has been installed to lessen wind current penetration into the chimney channel. If the chimney device is not constructed in compliance with the regulations, it will be necessary to install a deflector and increase the pipe after taking the steps outlined below.

There are occasions when cleaning the chimney of soot is required to create a stronger draught.

To address the issue of the boiler blowing out, you must take the following actions:

  1. First of all it is necessary to check the level of draught in the chimney. It is better to use an anemometer. If you can not find it, then when the boiler is running, you need to lean a paper against the chimney outlet hole. If the sheet is drawn to the chimney, there should be no draft problems.
  2. If it was possible to find that the blowing is due to the loss of natural draught, then it will be necessary to check the joints of the flue pipe. A thermal imager is used for this purpose. If the pipe is leaking air, the device will show a strong temperature difference between the main pipe and the junction of the two modules.
  3. If the chimney is assembled correctly, then it is necessary to clean the flue channel with a rope with a nozzle. The diameter of the nozzle is selected to match the cross-section of the chimney pipe. To remove soot, tar and other products of combustion is used revision hole at the bottom of the chimney.
  4. After performing these simple actions, it will be necessary to check the draught level again. If the natural draught has not improved, it is necessary to carry out work to correct the height of the chimney and install a deflector. During installation, a heat-resistant sealant and crimping clamps are used.

To have the gas equipment checked, call the gas service if the previously mentioned work has not succeeded. It’s possible that hypersensitive automatics are the cause of the blowing issues.

Video: how to check the draught in a gas boiler

Adherence to the regulations ensures that no anomalous circumstances arise while the chimney is in operation. This is particularly true for vertical chimneys, where installation errors will require a significant amount of time to fix.

Types of pipes for heating boilers

It is feasible to differentiate between the primary chimney types. They’re not just one, there are several.

Block. Brick chimneys are traditional chimney designs and have a pleasing appearance. Meanwhile, there is a decrease in their demand. It takes a lot of time and money to lay bricks. A solid fuel heating boiler should never use a brick-made pipe. Brick’s structure deteriorates over time because it is highly susceptible to the poisonous smoke released when solid fuel is burned.

The square design of brick chimneys is one of their main drawbacks. This is why soot buildup in chimneys needs to be cleaned on a regular basis. The chimney channel is covered with a cylindrical steel pipe to lessen the effect of the acidic environment on the brick structure. There is a metal sleeve inside the brick chimney.

Metal. Stainless steel is a material that is most frequently used in production. These pipes work well with solid fuel heaters and are utilized in gas heating boilers.

A stainless steel chimney system is the most sensible and long-lasting.

Chimneys made of stainless steel require extra insulation. Multilayer chimney factory models are available for purchase, or you can DIY insulation. Typically, a "sandwich"-style construction is used for this purpose, consisting of two pipes of varying sizes, one serving as a chimney and the other as a protective sleeve.

Very helpful advice! Construction that is insulated shouldn’t be overly heavy. The space between the sleeve and the chimney is filled with lightweight materials like basalt wool.

Ceramic. Refractory chimneys—made of high-quality ceramics that can tolerate temperatures as high as 1200 degrees Celsius—are used with solid fuel heaters and gas boilers. These chimneys are constructed in two parts: the outer shell, known as chamotte, is made of expanded clay concrete, and the inner tube is made of ceramic.

Coaxial. Several materials, including polypropylene, steel, polyphenylene sulfide, and ceramics, can be used to create this kind of chimney. Coaxial chimneys are inappropriate for use with solid fuel boilers. Only gas boilers with sealed furnaces use coaxial flue pipes. Coaxial chimneys differ from other pipe types in that they have two structural components. The first one allows gases to be released outside, while the second allows air to enter the boiler.

Coaxial chimneys are only appropriate for boilers that burn gas.

Metal, ceramic or coaxial chimney

Chimney pipes for gas-fired boilers in private homes can be coaxial, ceramic, or made of metal. The manufacturer typically specifies in the technical documentation the ideal kind of chimney material that is appropriate for use with a specific boiler.

Design of chimneys

A metal chimney is the most popular choice because it can function at temperatures up to 800 degrees Celsius. These chimney structures typically have stainless steel pipes, but black metal coated in zinc can also be used in their manufacture.

In general, the standard design consists of multiple parts: a thin iron casing, a layer of heat-resistant basalt wool, and an inner layer of stainless steel comprise the chimney. Metal chimneys have several benefits, including a strong resistance to mechanical harm, enhanced dependability, and a generally presentable appearance.

Chimney ceramic pipe

Though it can withstand temperatures as high as 1200 degrees Celsius, ceramic is somewhat less popular among consumers. Three layers make up the construction as well: a ceramic component, an insulating layer, and a hard shell made of expanded clay concrete. Chimneys made of this material stand out for their high fire safety, simplicity, and dependability during installation.

Coaxial chimneys are prized for their adequately high performance qualities and attractive exterior appearance.

This type of construction generally has a rather specific shape, which gives it a significant advantage in that condensation does not form on its inner walls. When selecting an appropriate material, you should think about purchasing a coaxial chimney specifically because this feature is crucial for gas equipment.

Scheme: coaxial chimney device

Take note! Gas equipment should not be used with brick chimneys, but solid fuel equipment can. As a result, in order to use gas boilers, the old brick chimney must be converted by installing a metal insert and then adding insulation.

What to do if the boiler furnace blows out

There could be a number of causes for this phenomenon:

  1. Insufficient height of the pipe.
  2. Freezing of the chimney.
  3. Excessive number of pipe fractures.
  4. Planting of the chimney.
  5. Wind blowing down the chimney.

The cause of the phenomenon must be found and removed in order to stop the boiler blowing.

There are a number of reasons why the burner could blow out, some of which are transient.

Installing a deflector on the chimney’s upper end is a tried-and-true method of reducing draughts. This apparatus yields a 20–25% increase in extraction efficiency. Furthermore, the boiler gains an ally in the wind by using a rotary deflector to change it from an enemy. The deflector’s wind-driven rotor forces a draught into the chimney.

Considering the wide range of deflector models available, their sole purpose is to increase chimney draught.

Precautions and tips for operating gas boilers

When every burner, including the igniter, is out of commission, the situation becomes extremely hazardous. This may lead to a build-up of gas in the space and an explosion. There are a few possible reasons for this:

  1. Pressure drop in the gas line or short-term fuel supply interruption.
  2. No draft in the chimney.
  3. interruption of the supply voltage.
  4. Igniter fading.

The first thing to do in any of the aforementioned scenarios is to manually cut off the gas supply right away. A required set of sensors makes up the built-in safety system of modern gas boilers.

  • flame sensor;
  • draught control device;
  • gas supply blocking device in case of a short-term drop in pressure in the network;
  • a device that switches off the boiler when the voltage in the boiler control network disappears;
  • a device for shutting down the boiler in the case of fuel consumption below the established norms.

Each boiler must have this kind of control equipment. In the event of any of the aforementioned situations, the gas supply must be turned off and the room must be ventilated first. Then and only then are spark-producing electrical appliances safe to use. One spot in the house where an LED flashlight should always be available is for safe mobility around the house.

Chimneys and variants of materials for their device

The low temperatures of combustion products and relatively high efficiency of today’s gas-powered heating appliances suggest that there will be a greater need for the materials used to construct chimney flues. More appropriate materials are gradually taking the place of asbestos pipes, steel, galvanized steel, and bricks in the construction industry. Not only are stainless steel Hungarian furanflex sleeves used more often, but special protective sleeves as well. Let’s take a closer look at each of these materials’ specifications.

Galvanized pipes

The lifespan of a galvanized chimney is only about three years, because steel pipes corrode easily enough. The service life can be increased by up to five years by applying a protective coating that has been specially created.

Asbestos-cement pipes

Although this material could only withstand a maximum temperature of 300 degrees Celsius, it was used quite frequently in the organization of the removal of combustion products. Although this option is reasonably priced, there are a few issues that need to be resolved (such as the difficulty of installing a chimney on a gas boiler in a vertical plane, the possibility of pipes rupturing or splitting when they overheat, and the capacity of asbestos cement to absorb moisture and condensate).

Brick chimney

Brick is by no means the ideal material for a chimney because condensation accelerates the material’s rapid deterioration. Damp spots, which are caused by the brick’s absorption of moisture and condensation, are frequently seen "decorated" on walls and ceilings in homes with brick chimneys.

Protective sleeve

The smoke venting device is a composite multilayer shell with equal ventilation duct and protective sleeve perimeters. This design’s primary purpose is to shield the flue ducts from the damaging effects of thermal gas flows. Ventilation ducts can be sealed with special sleeves, which can also reduce the effect of combustion products on the chimney, increase the draft, and extend the building’s overall operating time.

Furanflex

It is a brand-new variation that is applied to the chimney appliance. It is composed of plastic that has been strengthened with unique fibers. This material stands out for its low thermal conductivity, ability to function efficiently at temperatures below 200 degrees Celsius, and resistance to interaction with the acidic condensate environment.

Stainless steel

This material rapidly overcomes the condensation formation threshold and has high tightness and fire safety indicators. Because of its smooth surface and round cross-section, stainless steel helps to create the maximum amount of draught.

The marking information on pipes of this kind should be carefully considered before purchasing, as it can have a substantial impact on the options available for joining different parts of a single structure as well as the quality of the welded joints.

Chimney insulation.

The insulation of the chimney structure is the next crucial area to focus on. This must be done, or else the exhaust fumes’ quick cooling will worsen the draught.

Also shortens the chimney’s lifespan because of the buildup of condensation and its effects on the structure of the chimney. Furthermore, more frequent chimney maintenance (draining of the same condensate), and so forth, are needed.

Chimney insulation needs to be applied with the same care as building structures. Considering the unique characteristics of condensate formation, the chimney should be insulated to a minimum height of six meters, depending on the height of the building. The primary steps of chimney insulation are depicted in the picture below. Thermal insulation needs to be shielded from outside influences.

The lack of condensation during operation is a crucial practical criterion for chimney insulation quality.

Some findings and conclusions

Regarding the challenging selection of a chimney pipe.

Information regarding the inadequacy of ASB pipes for the device chimney and the superior quality of contemporary modular chimneys (made of stainless steel, glass, ceramic, etc.) can be found on the Internet. д.). As a result, I want to bring the following to readers’ attention. When all factors are considered, pipe ASB meets or exceeds modern analogues in certain parameters when used as a chimney for gas-operating boilers.

Using the ASB pipe when the boiler runs on solid fuel (coal or wood) is extremely risky.

Exhaust fumes can reach temperatures of 250–400 degrees, and the ASB pipe will burst if soot—a substance created by burning solid fuel—is burned. However, burning soot raises the temperature to over 1000 C, which is why most modular chimneys break down as well.

The primary benefits of modular chimneys include their ability to be manufactured with high precision in dimensions and their capacity to produce a wide range of intricate parts, such as elbows, tees, transitions, and other components. д. is most practical for installation companies and suppliers.

It makes it possible for a small team (three to four people) with average qualifications to install a chimney on an object in a day or two without the need for expensive equipment, earning them a very good living in the process. The primary benefit of modular chimneys is this.

Condensate about "scarecrows."

Another advantage of modular chimneys is this.

  • Yes, if we are talking about a chimney for a boiler room with a capacity of about 100-150 and above kilowatts.
  • Indeed, such a problem is possible there. But if we take into account that in most private buildings the power of heating boilers does not exceed (30-50) kW, and sometimes even less, and the insulation of the chimney is made qualitatively, then the problem with condensation practically does not arise at all.
  • An important point from the point of view of condensate formation is the boiler operation mode. Imported boilers (unlike Russian-made boilers) usually use the "start-stop" mode of operation (economical mode in terms of gas consumption). Therefore, when the boiler is switched off, the cooling of the flue pipe of the modular chimney, made, for example, of stainless steel will be more intensive than, for example, from the pipe ASB. It is logical to assume that the probability of condensation for a modular chimney is even higher than when using insulated pipe ASB (taking into account its properties and parameters). Example from personal experience: Russian-made boiler, most of the time (percent 50-60) it works on the ignition wick (wick power is about 2.5 kW). This is enough to maintain the temperature in the house (except for severe frosts), and to keep the temperature in the chimney constant. Condensation has never happened. The total gas consumption, taking into account the boiler (16 kW), gas stove (19 kW) and gas 4-burner stove is about 2100 cubic meters. m for seven months of the heating period (from October 1 to May 1). The area of the residential building is about 100 m 2 (8.5×12.5) m. Region of residence – the middle strip of Russia.

Installation of the chimney according to the rules

There are two methods for installing the chimney, depending on where the gas boiler will be placed in relation to the house:

Within the space. Such a system is difficult to install, and tight fire safety regulations must be followed because there is a greater chance of an ignition or carbon monoxide leak into the room from such a chimney. Only the pipe on the roof will require insulation if the chimney pipes pass through all heated rooms. Remember that fixing a chimney like that is challenging.

Choices for Coaxial Chimney Installation

In order to drill holes in the ceiling and roofing for the pipe gas drain, you must first mark the area where the chimney for a heating gas boiler will be mounted independently. After that, do a final check-through because as they say, "measure seven times, cut once." Remove the opening by cutting. Now let’s get the chimney put together:

  • connect the heating boiler socket with the adapter;
  • now it is necessary to connect the tee and the revision. After that, a sheet of steel is attached and the main holder is fixed;
  • Increase the gas outlet pipe from bottom to top, if required, then apply knees;
  • a special spigot is used in the place where the chimney crosses the ceiling of the house;
  • Then you need to put a sheet of galvanized sheet on the chimney with a hole made in it, which is larger than the diameter of the chimney, and fix this sheet on top and bottom of the ceiling;
  • All the places where the joints of the construction of the gas outlet, it is necessary to additionally reinforce with clamps;
  • at the top of the chimney put a tip – it will protect the chimney from the weather.

Chimney placement: internal and external

Externally. The chimney is simple to install and maintain because its component parts are all the same size. All the way up to the chimney, thermal insulation is needed. The steps to follow in order to mount the chimney outside the house are as follows:

  • mark out the places for drilling openings and double-check them. Then in the drilled opening we put through the passage part of the system, one end of which is hermetically connected to the boiler socket. The section that penetrates through the wall is insulated;
  • fix the revision and tee, then connect the plug;
  • install the elements of the gas duct from bottom to top. We do not forget to fasten with holders to the surface of the house;
  • all joints reinforce with clamps;
  • now it is necessary to attach thermal insulation along the entire length of the chimney, you do not need to do this if you have used a pipe – sandwich.

Techniques for installing the chimney

While putting in the chimney, keep in mind:

  • All elements of the structure must be assembled correctly, gaps are inadmissible, as well as inadmissible deflection of elements;
  • in places where the chimney crosses the structure of the house, it is necessary to install passage elements;
  • The boiler and the chimney are connected by applying a heat-resistant sealant to the joints.

Advice: To insulate against heat loss in chimneys, cover the mineral wool with foil or a sheet of galvanized steel from above. However, ready-made items composed of mineral materials are already available for purchase; all you have to do is measure the pipe’s diameter and length.

Stages of chimney installation

The chimney’s cross-section and dimensions cannot be determined unless the boiler is purchased. Only then should the chimney selection process begin. A circular cross-section is the ideal form, but a rectangle will do as well. Multiplying the internal size by the chimney’s length will yield the usable area:

Inside, S=π x d. ̅ L

It is important to note that the pipe’s entire usable cross-section is larger than the boiler’s internal area.

The chimney’s location in relation to the roof ridge should be taken into consideration when choosing its height.

The table displays the minimum heights of the chimneys. It is permitted to go up, but it is not permitted to go down. It is therefore necessary to use a pipe with a smaller cross-section but a longer length if the calculation indicates that the requirement that the pipe’s useful cross-section be greater than the internal area of the heating unit is not met.

An internal chimney requires a foundation to be built underneath it. Dew will be reduced if a protective brick channel is also added. Chimneys are occasionally affixed externally to the wall the unit is situated behind.

Internal design of the chimney

Select a location before moving forward with installing the chimney underneath it. Next, indicate the locations where it will pass through the roof and ceiling. Make openings and carefully verify that the markings are accurate. The boiler branch must then be connected to the chimney before the revision and tee are mounted.

Secure a steel sheet, place the main bracket, extend the pipe, and use your "knees" if needed. Where there is contact with the floor slab, spigots are utilized. Attach a piece of galvanized steel to the floor that has a hole punched through it to allow the pipe to flow freely through. To strengthen the joints, clamps are utilized. The chimney is fastened with clamps every 2 meters and brackets every 4 meters.

Verifying the tightness of the seams completes the work. Apply a soap solution to each joint to accomplish this. Bubbles won’t form in these areas when the unit is connected to the chimney if everything is done correctly.

Arrangement of the external chimney

Create a hole in a blind wall big enough for an insulation-filled pipe to pass through freely for a remote chimney. The first component of the future chimney will be installed in the opening, fixed, and covered in insulation. The following sections are added from the street side, using a plumb line to control verticality.

Outside chimneys are safer, but they need to be properly insulated. The components of the purchased construction are all properly fitted, ensuring a trouble-free assembly.

Brackets are used to secure the pipe to the wall until the desired height is reached. Affixing the pipe to the boiler spigot and caulking the joints completes the procedure. The external chimney is fully insulated with basalt wool to facilitate rapid warming.

Material requirements

Essential material specifications:

  • fire resistance;
  • anti-corrosion properties;
  • resistance to the effects of acid formed by the interaction of condensate with combustion products;
  • long service life.

Chimney made of brick. Its low draft and propensity for quick disintegration stem from the copious amounts of condensation that form on its surface and solidify into an ice crust during the winter. Perfect only for fireplaces or as a type of chimney flue cover made of stainless steel.

Stainless steel. It is among the most well-liked among its counterparts because of its many benefits. Its long service life, resistance to corrosion and fire, and good draft are noteworthy features (especially two-circuit models). Even non-professionals can construct steel chimneys with a variety of configurations thanks to the modular assembly method. suitable with boilers of high power. will endure for fifteen years.

Chimneys made of galvanized steel significantly worse usage-related behavior. It is possible for rust to form on galvanized.

Maximum service life of five years.

Fireplace made of ceramic. As large on the outside as a brick one. Option for installation: only vertically only. Manufacturers in Austria have created ceramic chimney models that have a metal outer contour in addition to the ceramic material. Although they are significantly lighter, you must account for the loads on the walls and foundation when installing them. Promise valid for 30 years.

Cement pipes with asbestos. Five-year service life, installation complexity, and non-ecological nature. The choice of such a chimney outlet cannot be justified, not even by the material’s low cost. Overheating can cause a pipe to burst. It is appropriate as a backup plan for infrequent use in the dacha.

Coaxial pipes are made of aluminum and are arranged one inside the other in the shape of two sandwich pipes with varying diameters. The inner one is meant to remove combustion products, while the outer one is meant to supply air. prefabricated building materials. Usually horizontal.

The benefits of a coaxial chimney

  • Safety
  • Increased efficiency of the heating system
  • Environmental friendliness

How to check the draught in the chimney of a gas boiler

One of the key signs that the chimney is operating properly is draught. These factors determine how effective it is:

  • cross-section of the chimney – heated gases are removed faster with a smaller cross-section, but if it is too small, there is a threat of penetration of combustion products into the room. If the chimney cross-section is unreasonably large, a reverse draught effect can occur;

The brick flue duct’s interior surface needs to be smooth.

  • accumulation of a large amount of soot on the walls of the trunk – this reduces the working cross-section, which leads to a reduction in the rate of carbon monoxide exhaust;
  • a large number of turns in the system – any of the pipe turns inhibits the movement of exhaust gases;
  • insufficient tightness of the chimney – the presence of small cracks, gaps contributes to the penetration of cold air into the system, which prevents the rapid removal of smoke;
  • weather – high humidity and low atmospheric pressure can cause a decrease in draft.

There are multiple ways to assess the level of draft. When a professional makes a diagnosis, they use an anemometer, which is a tool for measuring the velocity of gas movement. In daily life, "folk methods" are employed:

  • visual inspection – if there is smoke in the room, there is a back draft;
  • using a thin sheet of paper – it is brought to the inspection window: the stronger the paper is attracted, the better the draft;
  • candle flame – a lit candle is brought to the chimney and the flame is blown out. The direction of smoke from the extinguished candle towards the chimney indicates a good draft.

The procedure for clearing soot from the chimney

Crucial! When turning off the equipment, gas boilers should have their draughts inspected. Depending on the cause of the draft’s weakness, improvements are made.

With the aid of a unique tool made up of a rope, a weight, and a ruff, the soot-filled channel is cleaned. Gradual movements are used to clean the entire length of the device after it is lowered into the channel. In order to completely seal a brick chimney, all of the cracks brought on by the masonry’s degradation must be fixed.

Various actions are taken to strengthen the draught, depending on its cause. With the aid of a unique tool made up of a rope, a weight, and a ruff, the soot-filled channel is cleaned. Gradual movements are used to clean the entire length of the device after it is lowered into the channel. In order to achieve full sealing of the brick chimney, any cracks resulting from masonry deterioration must be repaired.

Chimneys for units with closed combustion chamber

A gas boiler with a chimney and an air intake pipe that feeds air from the street to the burner is known as a closed combustion chamber heating unit. The coaxial chimney can be swiftly installed on site because it is delivered ready-made. Its diameter ought to match the boiler outlet nozzle’s diameter.

Coaxial flue

While the work is being done, the pipe is attached to the gas boiler spigot and is withdrawn at a convenient height through the wall in a horizontal manner (90 degree turn). Several guidelines need to be followed:

  • There must be at least 20 cm clearance between the ceiling and the horizontal section of the chimney;
  • The outer edge of the pipe must be removed from the surface of the outer wall by at least 30 cm;
  • The distance between the chimney and the ground surface must be at least 20 cm;
  • From the edge of the chimney to the wall of the neighboring building should be at least 60 cm.

Diagram for installing a coaxial chimney

When selecting a gas boiler with a closed combustion chamber in an area with a severe climate, one should consider both the coaxial chimney’s ability to prevent freezing and its kW capacity. Condensate in the external pipe circuit may be supercooled by cold air, which could cause it to freeze on the inner walls and clog the channel.

Normal operation of heating equipment is impossible without a competent approach to chimney arrangement.

A video about the subject:

Choice of material

A question that usually does not cause problems for the average resident, but more often the usual inlets are very unsuitable. In the old house try to attach a brick chimney for a gas boiler, use often out of habit pipes made of asbestos cement, black metal or ordinary stainless steel or galvanized. All these options are categorically inadmissible to use for the removal of combustion products of natural gas. These materials are not able to resist corrosion from the rattling mixture of condensate, sulfuric acid and ash, and people who used them, simply do not connect their poor health, heavy air in the room, constant problems with the boiler with the quality of materials from which the chimney was made.

It is acceptable to use for setting up the chimney for a gas boiler:

  • acid-resistant steel grades (AISI 316L, AISI 310S);
  • dense ceramics.

Only series 4xx steel grades may be used, and only on the boiler manufacturer’s advice.

All the components and materials needed to construct a high-quality chimney without any unique issues are already available in building material markets and specialty stores. While there isn’t much of a price difference when using homemade versions, the outcome is more dependable, aesthetically pleasing, and clean. Select from:

  • sandwich pipe;
  • uninsulated steel pipe;
  • ceramic pipes.

Steel chimneys single-walled, double-walled (sandwich)

Exhaust gas temperatures can reach up to 680 °C, which is ideal for gas boilers that operate between 170-240 °C.

A ready-made and sensible solution. There are two different sized pipes that are inserted into one another. The diameter of the inner one, which forms the chimney channel, dictates the properties of the entire construction. The thermal insulation layer is shielded by the large outer pipe. To ensure that the insulation is safe to withstand temperatures as high as 1100oC, the space between the pipes can either be left empty or filled with basalt wool without the use of synthetic binders.

Prefabricated components are made:

  • straight pipe 5, 1.0, 1,2 meters;
  • elbow 30, 45, 90 degrees;
  • tee;
  • cone;
  • gate valve;
  • header;
  • adapter;
  • penetrating elements.

In a matter of days, the chimney is put together like a builder, accounting for any passageways between floors and walls.

The best sandwich chimneys are made of steel 310 and 316 for the inner pipe, but sheet steel 4xx series can be used for the outer casing because it is not exposed to corrosive environments and is affected by lower temperatures.

Both traditional single-wall steel chimneys and their component parts are used for low-temperature chimneys. The priority steel grades correspond to those of the inner channel of the double-walled elements 310 and 316. In severe circumstances, single-wall pipes can be used to independently construct a chimney, and insulation can be added on top of them. For instance, the business Rockwool creates cylindrical insulation specifically for this use, and it can tolerate operating temperatures of up to 680 oC.

Ceramic chimneys

For a gas boiler, an operating temperature of up to 1500 oC is more than sufficient.

Fresh from the ancient and forgotten. Contemporary ceramic chimneys are distinguished by their completely resistant nature to corrosion and the effects of abrasive media, as well as their interior surface roughness. Ceramic chimneys are unique primarily because of their robustness and longevity. This is a contemporary take on the typical brick chimney, but it has a convenient design and no drawbacks.

The configuration of the ceramic chimney

Small sections are assembled to create the ceramic chimney. They are all composed of a square concrete base with a rounded channel with branches formed inside. The channel for the future chimney outlet is formed by the ceramic pipe that is fixed inside.

Because concrete gives a structure strength, chimneys up to 12–15 meters high can be built without the need for additional reinforcement. Direct reinforcement is applied to the sections’ inner channels.

For dependable thermal insulation, basalt wool can also be used to insulate the section’s ceramic pipe.

But ceramics cannot be used for the entire chimney, from the boiler to the roof flashing. Steel pipes, including corrugated ones, are used to form horizontal and numerous inclined elements if the boiler equipment installation project permits it.

Types of modern chimneys

Currently, three types of flue ducts are used in private homes to provide natural drafts:

  • brick with stainless steel insert;
  • ceramic;
  • double-walled insulated pipes of sandwich type, shown in the scheme.

Note: The different coaxial systems for gas turbine boilers are primarily similar in design and are constructed of stainless steel.

Since it is challenging to compare cheap asbestos pipes to contemporary ones, we have excluded them from the list. It should be noted that SNiP only permits their installation in single-story buildings and that exterior insulation is required. The savings will be negligible considering the weight of asbestos cement and the troublesome installation process. Using basalt fiber and a layer of galvanized roofing steel to encase stainless steel is a simpler task to accomplish by hand.

Pure brick chimneys are also a thing of the past. The best course of action when building a sturdy and dependable chimney inside a brick wall is to choose between these two options:

  1. Insert a stainless steel pipe with a wall thickness of at least 1 mm inside the brick shaft.
  2. In the process of construction, lay in the wall special blocks with insulated basalt fiber ceramic sleeves.

Although less reliable than a set of ceramics, the version with a metal insert is less expensive. Once more, purchasing and assembling a modular sandwich is considerably simpler than constructing brickwork and adding a sleeve in that spot. The act of putting together a gas duct using pipes with two walls is taken into consideration. Another challenge is that the outer diameter of the boiler spigot and the shaft’s cross-section do not always line up due to the size of the bricks. The aperture can only be increased, which isn’t always feasible, and cannot be decreased.

Ceramic components for chimneys

Selecting the appropriate chimney for your gas boiler in a private home is crucial for both safe and effective heating. Knowing the different kinds of chimneys available will help you choose the right one for your house.

First, think about the kind of gas boiler you currently own and whether it works with various types of chimneys. Seeking advice from a professional is advised because certain boilers may need particular kinds of chimneys in order to function at their best.

Next, assess the various types of chimneys, including direct vent, metal, and masonry chimneys. It is important to choose a type that best fits the layout and heating requirements of your home because each has a different set of features and installation requirements.

Furthermore, be mindful of the installation procedure and make sure that it is completed by trained experts. In addition to guaranteeing optimal operation, proper installation reduces the possibility of safety risks like carbon monoxide leaks.

To guarantee the chimney’s longevity and effectiveness, regular inspections and maintenance are also essential. Plan yearly examinations to identify possible problems early and take immediate action.

In conclusion, compatibility, variety, installation, and maintenance are all important considerations when choosing the ideal chimney for your gas boiler. For many years to come, you can take advantage of effective heating in your own home by making wise decisions and putting safety first.

Video on the topic

How to choose a chimney for a gas boiler and do not make a mistake.

Chimneys for gas boiler / Which chimney to choose? #chimney

Gas boiler and chimney in the house. Placement of a wall-mounted boiler. Coaxial chimney into the shaft. Installation.

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