Single-circuit gas boiler designed to equip the heating system, but can also be used for the needs of domestic hot water (in conjunction with an indirect heating boiler). When choosing the power of a heating boiler, the dimensions of the heated rooms are primarily taken into account. To interact with the boiler, it is necessary to buy a single-circuit boiler with a power of 21–24 kW, capable of quickly heating water (so that the interruptions in the operation of the boiler for heating are short). Often single-circuit boilers heating service rooms up to 300 m 2 .
Types of single-circuit gas boilers
According to the installation method, you can choose wall and floor single-circuit gas boilers. In apartments and small cottages, hinged models are often used - compact, easily attached to the wall, and sometimes built into furniture. For service large areas(from 200 m 2) it is recommended to buy a floor-standing single-circuit gas boiler - more powerful and more complex in design.
According to the principle of operation, boilers are:
- atmospheric - equipped with an open combustion chamber and use a chimney to remove exhaust gases;
- turbocharged - units with a closed combustion chamber using a fan and a coaxial chimney;
- condensing - the most economical boilers, which additionally use the heat of condensation of water vapor present in the flue gases.
It is most profitable to buy a single-circuit gas boiler in situations where there is a centralized hot water supply or an electric heater is used to implement these tasks.
The principle of operation of a non-volatile gas boiler
Single-circuit gas heating boilers are often equipped with an open combustion chamber, and the existing natural draft is used to remove exhaust gases. In the premises for the installation of such equipment, it is important to ensure compliance with sanitary and hygienic requirements and create fire safety conditions. Since thermal units with an open combustion chamber consume air from the room, they should be placed in a separate room. To eliminate flue gases, a chimney or an exhaust hood is used.
A single-circuit boiler with an open combustion chamber has a relatively low efficiency, since a significant part of the heat energy is wasted through the hood or chimney. A wall-mounted gas boiler with a closed combustion chamber is more economical, which takes air from the street using a special fan. Flue gases are removed in the same way. A coaxial chimney is used to supply air and remove exhaust gases, consisting of combined pipes of various diameters. A wall-mounted single-circuit gas boiler with a chimney of this type is distinguished by simple installation and low installation costs.
Trading House "StroyObjectSnab" offers extremely favorable prices for single-circuit gas heating boilers. We sell reliable, energy-efficient and safe equipment of the best world brands.
Good day. Who will explain what a coaxial boiler is, and I need it if I just want to replace the old boiler in the house with a new one?
"Coaxial" refers more to the type of smoke exhaust, but in general, these are wall-mounted gas boilers of a closed type, i.e. they take combustion air from outside the room, and the products of combustion are discharged outside in most cases through the wall. See figure - smoke is removed through the inner pipe, air for combustion enters between the inner and outer pipes. When replacing an old boiler, in any case, it is worth focusing on a closed boiler - there are no problems with draft in the chimney, it does not take air from the room. The specific nuances of the installation must be clarified with the specialists who will install the boiler.
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What kind of coaxial boiler, only in a simple way
And if I have an old Zhukovsky boiler, can I put such a closed one?
What kind of coaxial boiler, only in a simple way
Anatoly wrote: And if I have an old Zhukovsky boiler, can I put such a closed one?
It has an open combustion chamber, such a boiler is not designed for air supply from outside the room. We somehow got out of the situation for a long time in this way, the grandfather conducted ventilation from the street from under the floor and air was supplied to the boiler blower. If you put your hand into this gap under the floor, then a strong cold breeze blew from there, especially in winter. The air, as it were, was taken from the room, but at the same time it was partially compensated by this self-made ventilation.
What kind of coaxial boiler, only in a simple way
When replacing an old boiler, the cheapest option is to install the same boiler, only a new one. Another question is whether you are satisfied with the gas consumption, lack of heating hot water, condition and draft of the chimney? If everything worked well, except for the boiler (drip, for example), change to a similar device, otherwise start looking for other options.
What kind of coaxial boiler, only in a simple way
Serg_i_K wrote: When replacing an old boiler, the cheapest option is to install the same boiler, only a new one. Another question is, are you satisfied with the gas consumption, the lack of hot water heating, the condition and draft of the chimney? If everything worked well, except for the boiler (drip, for example), change to a similar device, otherwise start looking for other options.
Yes, in this case, it is not required to receive equipment from the gas distribution organization for replacement, there is no need for a project, no approvals. It is only necessary that the apparatus be replaced by representatives of a specialized organization that has access to this type of work. And write an application to the territorial service for the operation of the gas economy (gorgaz, if it’s quite simple), a person will come from them, he will need to present equipment and documents for it, he will put a mark in his “object passport”. This is how everything will be legal and correct.
What kind of coaxial boiler, only in a simple way
Very interesting, it turns out, you can do without a chimney at all?
And what about such a pipe in a wooden house? Can you get through the wall? And how should the passage through the wall be isolated? If you wrap it with an asbestos cord, is that enough, or are there any special means or insulation?
What kind of coaxial boiler, only in a simple way
Artemy wrote: how about such a pipe in a wooden house? Can you get through the wall? And how should the passage through the wall be isolated?
The release of a coaxial chimney through the wall in a wooden house is quite possible, this is normal practice. Since the coaxial chimney is made according to the "pipe in pipe" principle, the combustion products are removed from the boiler through the inner pipe of a smaller diameter, and the combustion air is taken in through the outer, larger diameter. That is, the surface of the coaxial flue will have a low temperature, there is no threat of fire when in contact with wood.
The passage through the wall is carried out in a metal sleeve, with a seal (often with mounting foam) in order to protect the gas duct itself from possible damage during temperature deformations, as is known, wooden house"breathes" and "sits down".
What kind of coaxial boiler, only in a simple way
And in recent times increasingly began to appear coaxial chimneys in cities. For example, three apartments in an old building were heated by a boiler installed by one of the owners. Paid according to the heated area. Now with installation gas meters the situation has changed. One of the neighbors decided to make his own heating system, and the second one decided to disconnect the third neighbor from his boiler. It was the gas convector that came to the rescue, installed in the room and equipped with just such a coaxial pipe, passed through outer wall. Five years in operation and no problems ...
What kind of coaxial boiler, only in a simple way
Anatoly wrote: And recently, coaxial chimneys in cities have begun to appear more and more often. For example, three apartments in an old building were heated by a boiler installed by one of the owners. Paid according to the heated area. Now with the installation of gas meters, the situation has changed. One of the neighbors decided to make his own heating system, and the second one decided to disconnect the third neighbor from his boiler. Here it was the gas convector that came to the rescue, installed in the room and equipped with just such a coaxial pipe, passed through the outer wall. Five years in operation and no problems ...
Anatoly, can you be more specific - what is the "old house"? How many floors? How many apartments? How is smoke removal organized? At what height is the smoke emitted? Where is the convector installed - in the living room? How is the gas supply made - also directly into the living room? On what facade are the chimneys from all these "free owners" of heating equipment? Very interesting, please give details!
Modern gas equipment is constantly being improved. New technologies in the production of gas boilers improve the efficiency, stability of the gas boiler, and increase fuel efficiency.
According to the regulations, the boiler must be placed in rooms with forced ventilation and a gas outlet channel. In houses where there are no premises with the necessary conditions, combustion products are removed using an external chimney or changes are made to the layout of buildings. Both options are quite expensive, and redevelopment is laborious. Whiter inexpensive option combustion products discharge is a coaxial chimney, which is used with a boiler with a closed combustion chamber. 
In the presence of a coaxial chimney, you can choose different places for installing the boiler and you don’t have to think about supply ventilation. A gas boiler with a coaxial chimney can be installed in the kitchen, attic or on the basement. There is only one necessary condition - the window.
The design of the coaxial chimney of a gas boiler consists of pipes of different diameters. The burnt gas is removed through the inner pipe, and air enters through the outer pipe. A boiler with a coaxial chimney does not burn the air inside the room. Installation is carried out horizontally using through hole in the outer wall. A slight slope will help in the removal of condensate, it is also recommended to install special condensate traps. Close proximity to the window is excluded - exhaust gas can enter the house.
One of the most important advantages of boilers with coaxial chimneys is high efficiency. The hot air in the inner tube heats the air flowing through the outer tube. The energy of the boiler is not spent on heating the air, but is directed directly to hot water supply and heating.
Stable and efficient operation of a gas boiler directly depends on the design of the chimney. Not a single boiler can work without air flow and draft. The parameters of the vertical chimney must correspond to the power of the boiler and the volume of air burned. Any violation will result in a fire hazard. Insufficient removal of combustion products will lead to harm to human health. Authorized bodies monitor compliance with fire safety rules and compliance of structures with standards, they issue permits for the use of boilers.
