A chimney for a gas boiler in a private home: the installation requirements

Correct operation of the heating gas equipment depends on the system products of combustion outlet. Before you build a chimney for a gas boiler in a private home, you need to be aware of types of equipment, how it works and regulations, according to which it is established. Regardless of who will carry out the work, to the choice of devices and the installation should be taken with full responsibility.

Types of chimney systems: how to choose a chimney

Installation recycling products of combustion systems for a gas boiler facilitates efficient functioning equipment and the entire heating system, safe and comfortable heating and uptime boiler. Before you buy a chimney for a gas boiler, it is useful to get expert advice on existing options chimney and the appropriateness of their use.

Types of flues for gas boilers:

• brick chimney - its construction is planned at the construction stage home and arranged the foundation under it. A prerequisite is smooth interior wall of the chimney. It should be noted that the construction must be resistant to the action of acid, which is generated due to vapor condensation. Otherwise rapid destruction will occur brick chimney pipe. Used in combination with ceramic or steel inserts. Masonry chimneys for gas boilers differ complicated device, the duration of the construction cost and cost. For technical indicators, they are inferior in many respects will be a modern smoke-deflecting systems;

• design of the stainless steel tube - a chimney embodiment has a high resistance to chemical environments and mechanical damage. The system is designed as a sandwich structure, when the tube inserted into the outer pipe with a smaller diameter. The space between them is placed fireproof material - basalt wool. The manufacturer offers a wide range of models of chimneys;
• Coaxial chimney - construction assembled on a "pipe in pipe": one tube for combustion air is drawn, on the other - derived products of combustion. Such a system has a high performance, enhances security of the entire gas equipment and increase its efficiency. And due to the fact that the combustion takes place outside the loop, with a coaxial flue boiler is environmentally friendly equipment;
• the chimney of the ceramic tube - is a ceramic blocks with insulation installed in a concrete frame. Such flue system resistant to fluctuations in temperature, is waterproof, fireproof and have a high mechanical strength. The basic requirement for installation - high quality ceramic docking modules.

What kind of pipe for the chimney is better to use - everyone decides on the basis of its particular situation. Most importantly, identify strengths and weaknesses of each option. No matter what type of chimney do you prefer, its design and the installation shall comply with SNIP 2.04.05-91 "Heating, ventilation and air-conditioning." Having studied these standards, you can learn how to install a chimney to a gas boiler.

A chimney for a gas boiler in a private home: the basic requirements of SNIP 2.04.05-91

Events for the flue gas unit for a boiler, from the stage of design to the installation of the system directly, must comply with the current regulatory framework, since improper installation and maintenance of gas appliances casts doubt on the safety of people using gas settings.

Main Chimney construction elements:

• flue - channel, exiting from the boiler to the chimney pipe connecting adapter;
• flue pipes;
• Audit - chimney attached to the bottom of the barrel and serves to channel the combustion products from the cleaning and removal of excess moisture;
• fastening members (brackets, clamps) - serve for fastening to a wall;
• Other components for system devices.

As a rule, the location of the gas boiler in a private house on the ground floor plan in a separate room (boiler). All elements of the heating system must be interconnected strictly airtight. Basic rules for installation of flues for gas boilers, regulating the order process are presented in the regulations SNIP 2.04.05-91 and contain the following requirements:

• Rod proper - ensures complete removal of exhaust gases;

• resistance to high temperatures;
• tightness of connecting places - all components over the entire length of the chimney system must fit tightly to each other;
• tube in place of its passage through the roof to be integral without joints;
• condensate - the design of this element should ensure the collection and removal of liquid;
• if the design is turning, in these places arrange audit hatches to diagnose the state of the chimney, its cleaning and condensate;
• branch pipe length direction should not exceed 1 m;
• may allowable number of rotations at the chimney pipes - not more than 3;
• height flue pipe should exceed the height of the roof (the highest point) to provide good traction and reverse occurred;
• the distance between the chimney pipe and the surface, which is made of non-combustible materials can not be less than 5 cm, and if flammable material surface - no less than 25 cm.

Useful advice!Fully sealed chimney sections will not allow hot combustion products go beyond the system.

Procedure for devices of the boiler flue gas in a private house

Depending on which stage is planned to install the chimney for a gas boiler removal system may be internal or external (remote). The built cottages, which provides for the use of gas boilers, domestic chimneys used, the placement of which is considered a project. In the houses of old construction the transition to heating by a gas boiler, a chimney discharged outside.

Compare the strengths and weaknesses of external and remote chimneys can be found with the table:

chimney type
External	Interior
It requires full insulation chimney	Insulation is required only in the region, which comes out
Subject to the rules of safe operation is guaranteed	There is a possibility of penetration of combustion products into the room, high fire hazard
Apparatus chimney made of the same elements and is simple execution	A sophisticated installation, as there is a need for a large number of components and constituent elements chimney
Availability to conduct any kind of repair and maintenance work	The difficulty in carrying out maintenance and repair of the chimney

Perform internal chimney mounting type gas boiler associated with the erection of the foundation and a protecting channel of bricks. Then the safety of operation is ensured. Such systems are more efficient and formation of condensate therein is minimal. In some cases, chimneys can be attach to the wall of the house, for which the boiler is installed.

Apparatus remote chimney requires qualitative fixing and binding the maximum thermal insulation, since the condensate in such structures is formed in a larger amount.

The main stages of the flue gas boiler installation for internal execution:

• marking places for the device holes in the ceiling and the roof of the house;
• opening device for chimney;
• connection with the boiler flue pipe;
• setting audit tee;

• capacity flue pipe;
• strengthening of the joints with clamps;
• mounting bracket structure;
• insulation outer part.

Useful advice!Location flue system should be strictly vertical, without narrowing or widening a channel.

Flues for gas boilers of stainless steel

steel chimneys may have a single-walled and double-walled construction. Monolayer exhaust pipe can be installed in heated rooms and for use gilzovaniya brick chimneys. The three-layer system between the two pipes have heat-insulating layer, which makes it possible to use them for both indoor and outdoor installation.

Because the gaseous fuel contained in the sulfur impurities in the derivation of a pair of its waste products have aggressive impact corroding wall chimney channels. Therefore, in the production of stainless steel chimney for gas boilers and acid used refractory material grade AISI 316L. Its use greatly increases the service life of chimney systems.

Of weaknesses stainless pipe for flue gas boiler can not absolutely be noted aesthetic appearance. The benefits include:

• resistance to corrosion and aggressive chemical composition;
• light weight, no need for a base device;
• incombustibility material - stainless steel is not melted even at a temperature of 500 ° C;
• modularity - serial production of a large number of tees, reducers and elbows embeds the chimney into any house;
• Factory production of all elements of the steel chimney allows to collect and withdraw it from any convenient angle;
• absolutely smooth circular internal surface - provides a minimum of obstacles to the output of the combustion products;
• can be mounted in an already built house;
• quite reasonable price for flue gas boiler.

When the device of the outer steel chimney high probability of formation of dew point: if the outside temperature is low, the exhaust vapors and form condensed water generated cork. It seals the passage, preventing the products come out, and thereby blocks the combustion process. This can be avoided by placing the pipe in the chimney channel Laid masonry brick. This method will decide and the aesthetic side of the building.

Another option to avoid the formation of water plugs - use the sandwich structure of two pipes, one of which is protected by a layer of basalt wool. This system remote chimney is no longer in need of additional insulation. The diameter of the flue gas to the boiler is adjusted so that it coincides with the cross section of the output openings of the equipment.

Useful advice! Stainless steel chimneys are easy to maintain, but once in 3 years it is necessary that the system inspected specialist.

Terms flue gas installation column

The key to the safe operation of the gas water heater is the correct exhaust system. To the column, chimneys, which displays the combustion products in chimney channel or directly to the atmosphere. Exhaust using such types of pipes:

• corrugated pipe - easy to install, flexible material allows
  pulling it up to 2-3 m in length, and also extend by connecting several segments corrugations;
• tube of aluminum - is easy to assembly, resistant to condensate requires additional insulation;
• coaxial chimneys - price of such systems may be reduced by allowing the withdrawal tube through the wall. This reduces the consumption of material and installation costs. The main advantage of such a chimney that during the operation of all the equipment is not part of the room air.

Basic requirements for the installation of chimney pipes for gas columns:

• operation of the devices is prohibited unless it is securely fixed in the chimney;
• Rod inside the chimney system must be constant;
• pipe material must be incombustible, resistant to corrosion by the action of condensation and high temperatures;
• flue outer portion should have a vertical disposition;
• construction must be sealed to prevent ingress of carbon dioxide into the room;
• exhaust pipe must be mounted in an open place for quick troubleshooting, if necessary;
• Chimney pipe must be located above the top level of at least 0.5 m;
• It is strictly prohibited to use for removing combustion products ventilation systems, space between floors, attics.

How to check the draft in the flue gas boiler

Rod - one of the main indicators of the correct functioning of the flue. Its effectiveness depends on such parameters:

• Chimney pipe section - heated gases will appear at a lower section, but if it is too small, there is a threat penetration of combustion products into the room. If the chimney section unreasonably large, it may give effect reverse thrust;

• accumulation of large amounts of soot in the barrel walls - at the expense of reduced working section, which reduces the output speed of carbon monoxide;
• a large number of turns in the system - either pipe bends inhibits movement of the exhaust gases;
• insufficient tightness of the chimney - slight cracks, gaps facilitates the penetration of cold air in the system that prevents the rapid removal of smoke;
• weather - high humidity and low atmospheric pressure can cause a decrease in traction.

Check the state of traction can be several methods. If the diagnosis is performed by professionals, they use an anemometer - instrument for measuring the gas velocity. In everyday life, enjoy the so-called folk ways:

• visual inspection - if the room there is smoke, then there is a reverse thrust;
• via a thin sheet of paper - it brings to the viewing window: the stronger the paper is pulled, the better traction;
• candle flame - lighted candle tray to the channel and is blown flame. smoke from extinguished candles direction towards the chimney indicates good traction.

Important! Thrust in gas boilers should be checked with the instrument off.

Depending on the reason for which there is a weak draft, take measures for its improvement. Cleaning channel soot is produced by using a special tool consisting of a ruff, sinkers and a rope. The apparatus is lowered into the channel and clears its translational movements along the entire length. To achieve complete sealing of the brick chimney, you must remove all the cracks formed by the collapse of masonry.

Coaxial chimney for a gas boiler: setting rules, advantages, installation

The main advantage of the coaxial installations for flue gas boiler in that a chimney not only outputs exhaust gases, but also provides a combustion chamber with air from the outside. With this premise does not require additional ventilation, the air in the house is able to maintain the health and performance of people there. Equipment with diverting combustion products is called a gas boiler without a chimney.

The design of the coaxial chimney

The basis coaxial chimney designs comprise two tubes of different diameter, one of which is located inside the other. The inner tube is designed to output the waste substances out. Via the outer tube, rather, through the space between the inner and the outer tube is drawn from the outside air, the gas used for the combustion. Thus chimney cope with several functions:

• increasing the degree of security of the chimney - the incoming air from outside is heated and the combustion products exiting cool;
• increasing the output of the boiler - the equipment efficiency is increased due to the fact that the air in the combustion chamber falls already warmed up;
• the maximum combustion gas - by the fact that the increased efficiency of the boiler, complete combustion of fuel is achieved;
• environmentally friendly heating system - the entire operating cycle of the equipment of the gas passes from the outside, which ensures comfort and safety heating.

To produce flue used round tubes: outer pipe diameter of 100 mm is made of steel 1.2 mm thick, the inner - aluminum alloy. final diameter is 60 mm. Pipes with diameter ratio of the quantities used in coaxial flues for wall gas boilers and floor devices with a camera closed type combustion. To avoid contact between the tubes themselves along their entire length jumpers.

By way of installation chimneys coaxial type can be horizontal and vertical. Horizontal embodiment is more popular due to easy installation. In the case where the mount system horizontal manner technically impossible or away from the boiler to the outer wall exceeds 4 m, resort to the installation of a coaxial vertical chimney. It is worth noting that its installation is more complicated.

Advantages of coaxial flue system

Coaxial flue gas used for different equipment, wherein the combustion chamber has a closed structure. This gas boilers floor and wall arrangement, gas flow heaters (columns), heaters and other devices.

It is worth noting the main advantages of using the coaxial flues over other types of venting systems:

• natural heat exchange - heat incoming air cooling the exhaust gases and is due to the pipe construction, which, in turn, prevents the wall become very hot;
• increase in productivity of gas equipment;
• compact - chimney neatly mounted and does not take up much space, which allows its use not only in private houses but also in the flats high-rise buildings;

• Safe operation - in the air space where the boiler is installed, there is no lack of oxygen, because the air is completely removed from the contact areas with the excretory substances;
• Easy to install - reduces the cost of installation of the coaxial flue.

Useful advice! If you purchased a wall hung gas boiler for independent heating apartments, use for him coaxial chimney is the most secure, since combustion products are not removed in the ventilation channel, but directly in atmosphere.

Requirements for the installation of coaxial chimney

As any gas equipment to install coaxial flues specific requirements imposed SNP 2.04.05-91, Section 3, "Heating"; 2.04.08-87, and the requirements regulated by "Rules of safety in the gas sector." They may be different depending on the method of installation of the coaxial chimney: horizontal or vertical.

For any type of installation there is a general requirement for the maximum length for a coaxial flue gas boiler: it can not exceed 4 m. When you want to spend the chimney system at a considerable distance, use special coaxial models with dimensions standards.

When switching coaxial vertical flue gas to the boiler through the roof slab and use adapter design which is provided by the manufacturer under the system. This applies to the extension of the coaxial chimney when you want to install a system of appropriate length. Tightness in the places where the pipes through the ceiling provides headroom special - terminal. He and prevents in precipitation.

Horizontal coaxial flue installation method is generally used for wall-mounted gas equipment. To avoid falling condensate must sustain bias the chimney downward from the boiler, comprising from 3 to 5%. There are norms location in the outer wall of the chimney flue channels. For example, if the opening is expected in the wall next to the window, the distance to the window should not be less than 0.5 m, if above the window - not less than 0.25 m.

Many manufacturers of gas equipment include supply and a pipe for discharging combustion products. If you bought a coaxial flue gas to the boiler with the equipment, you must check the availability of complete the horizontal part of the pipe (usually about 1 m in length), removal of the terminal (tip), a set of seals, membrane. If during installation of the pipe through the wall is required to bypass any protrusions or valve is used and the knee bends.

Useful advice! It is necessary to provide for the protection of all the findings and inputs on coaxial chimney against foreign objects.

Coaxial chimney for a gas boiler in a private home: how to make your own hands

Before installing the coaxial flue with their hands should be familiar with guidelines for design and operation of the acquired gas equipment. Because of the specificity of the design of the coaxial pipe, assembling the chimney to a gas boiler wall must be made very carefully. Should be avoided on pipes dents or other damage, leading to the depressurization system.

To perform work on the installation of the system will need the following items:

• tube with a flange;
• crimp collars;
• coaxial knee;
• adapter for connection to the boiler;
• strip with sealing sleeves (if needed);
• laths.

According to the requirements for mounting the chimney orifice is arranged in the required diameter of the outer wall. If the wall has a window opening, necessary to have a hole at a distance closer than 0.5 m from the window. When connected to a flue gas boiler first adapter is connected, and then all units assembled into a unitary structure.

Tube through a hole in the wall discharged outside, keeping the slope of the boiler. If it is necessary to bring the chimney to the wall structure is fixed with clamps. The gaps between the wall opening and the tube inserted blown foam or mineral wool sealed. After that close the space with decorative rings.

Chimney unit from bricks with their hands

The design of brick chimney is solely a vertical channel with a square or rectangular cross section. For masonry brick chimney use corpulent ceramic bricks, which are laid in the solution. The outer channel segment spread ordinary brick, corresponds in the style of house building that can be seen in many photos of brick chimneys. If the house is lined with stone or plastered, we can in the same way and draw the chimney.

Masonry chimneys for gas boilers: installation requirements

Before put flue boiler of brick, it is necessary to build the foundation, the height of which must be at least 0.3 m. Dimensions perimeter grounds must advocate for the canal loop is not less than 0.15 m. If the chimney is located in the part of the outer wall, its base should be flush with its base. Masonry chimney made of bricks with their hands (video instructions confirm this) start at the stage of construction of the walls of the house.

Requirements for chimneys made of bricks:

• flue channel must be vertical, without ledges, and narrowed extended portions;
• thickness for masonry brick chimney flue is taken with the exception of freezing;
• the minimum allowable cross section chimney channels - 14 x 14 cm, which corresponds to half the size of the brick with the suture;
• size of brick chimney whose height is less than 5 m, it is necessary to increase the passage section of 14 x 20 cm;
• the construction of the chimney is made in the walls between heated rooms, which will prevent it from cooling and reduction in draft;
• tightness - masonry brick chimney performed with ligation to vertical seam overlaps the previous row of the next brick;
• inner channel surface should be smooth;

Useful advice! To achieve even and smooth the inner surface, in the construction of a brick chimney with his hands using special templates.

• the distance between adjacent channels chimney must be at least 5 average outer diameter of the pipe;

• if located next to the chimney vent passages, their height should be equal to the height of chimneys.

To reduce construction costs, should be in the general chimney arrange as many channels as possible. In this case, placed near Chimney and ventilation channels will heat each other, which generally improve the functioning of the chimney.

Preparation for the masonry chimney brick solution

Composition for masonry brick chimney solution is selected in view of a length of pipe laid: external or internal. To erect the outer channel using the same solution as for the bearing masonry wall construction. It is prepared from cement, sand, water and can harden in air and in water. The mixture is prepared in such an extent that within an hour it was drawn up, as she quickly grasped.

To the mixture under the influence of an aggressive environment is not destroyed, it is recommended to add special additives which increase its flexibility, strength and acid resistance. With these additives can improve the quality of the masonry, to increase the speed of construction and durability of the work performed.

Preparation of flue bricks solution from passing inside the house, based on its use in the composition of refractory clay and fireclay in the ratio 1: 1. Such mixtures are well cope with the high temperatures, they are durable and do not emit harmful substances. To give strength clay mixture can be added to its composition table salt (about 120-150 grams per bucket).

Useful advice! Durability for masonry chimney solution can be enhanced by adding Portland cement in a proportion of 1 kg per bucket.

Performing masonry chimney made of bricks with their hands, you can buy ready-made mixtures, different heat resistance and acid resistance. Preparation of the solution can independently reduce costs for the construction of the chimney.

It is possible to build a chimney made of bricks with their hands - video, shown below, will get acquainted with the construction of the construction phases with all the basic requirements.

The feasibility of using a brick chimney to a gas boiler

Given the advantages and disadvantages of brick chimneys, possible to draw conclusions with respect to their use in conjunction with gas boilers. These benefits include:

• the possibility of using an existing chimney duct, which reduces the cost of the chimney;
• possibility of operating in conjunction with equipment having an open combustion chamber;
• reasonable cost of materials for the construction and finishing of buildings.

Durability brick channels observed only when they are used for fireplaces or stoves. In the case of using them for gas-fired boilers, due to the low temperature combustion products will be formed on the channel walls condensate, and the harsh operating conditions in aggressive environments will lead to the gradual destruction of the brickwork and the deterioration of workers' indicators.

In addition, such requirements are more stringent chimneys:

• flawless clutch - if the skills are not enough, you need to be invited to work by a qualified mason, which would cost a round sum. Prices for the work: chimney brickwork rough from 6000 rubles per 1 m³, facing brickwork - 2500 rubles. for 1 m²;

• inability to perform complex channel configuration (when bypass is required, for example, the beam in the ceiling);
• using the old channel should be conducted using gilzovaniya;
• the need for thermal insulation.

The disadvantages of this system include the reduction and traction on the warm-brick. Thus, for best flue gas boiler will house channel together with an insert of steel or ceramics. On a photo chimneys of brick shows that the inserts are fitted in the process of laying channel. Thus it is necessary to leave a gap between the liner pipe and a brick surface. This is necessary in order that the pipe can be moved within the channel.

Flues for gas boilers: the prices of various types of pipes

Its budget planning when acquiring chimney pipes must be taken into account the length and diameter of the channel, the presence and number of turns, as well as the material from which the pipe. Fundamental differences in the structure and cost of flue gas boilers for floor and wall units there. stainless steel chimney is more expensive than a brick chimney, but the steel pipe is easier to install, which makes its installation costs quite affordable.

Buy a chimney for a gas boiler can be in specialized sales outlets and online stores that implement these products. By implementing serves as a great assortment of fittings, fittings, tees, reducers, plugs and other necessary design details. Given the convenient sorting items into categories and models, you can quickly find and order the right product.

Cost of 1 m single-stainless steel pipes with diameters of 100, 110, 115, 120 is 650 mm rub., The same tube diameter of 140-150 mm cost 750 rubles. Price knee rotation angle 90 ° for stainless steel pipe with a diameter of 110-120 mm is 550 rubles. the metal thickness of 0.6 mm. Purchase 1 m sandwich tube of stainless steel may be 140-230 mm per 1900 rub.

Useful advice! Save on the purchase of high-quality and durable pipes for chimneys can be the case if you order it in the discount period.

Price coaxial flue gas boiler for a diameter of 60-100 mm length 1 m, implemented in a horizontal complete, is 3500 rubles. The acquisition of Baxi coaxial chimney - a global manufacturer of modern heating systems - will cost 4200 rubles. The complete kit for the chimney wall gas boiler enters tube 75 cm long with a diameter of 60-100 mm, outlet 90 ° and tip. All products are warranted.

Competent installation of any household appliance - the key to its safe and continuous operation. Especially when it comes to gas equipment. Installation flue gas exhaust system for gas boilers requires preliminary engineering calculation and qualified implementation.