A heating gas boiler is a device that, by means of the combustion of fuel (natural or liquefied gas), heats the coolant.

The device (design) of a gas boiler: burner, heat exchanger, thermally insulated housing, hydraulic unit, as well as safety and control devices. Such gas-fired boilers require a chimney to be connected to remove combustion products. The chimney can be either a conventional vertical or coaxial (“pipe in pipe”) for boilers with a closed combustion chamber. Many modern boilers are equipped with built-in pumps for forced circulation of water.

The principle of operation of a gas boiler- the heat carrier, passing through the heat exchanger, heats up and then circulates through the heating system, giving off the received thermal energy through radiators, underfloor heating, heated towel rails, and also providing water heating in an indirect heating boiler (if it is connected to a gas-fired boiler).

Heat exchanger - a metal container in which the coolant (water or antifreeze) is heated - can be made of steel, cast iron, copper, etc. The reliability and durability of a gas boiler depends on the quality of the heat exchanger in the first place. Cast iron heat exchangers are resistant to corrosion and have a long service life, but are sensitive to sudden temperature changes and are quite heavy. Steel containers can suffer from rust, so their internal surfaces are protected with various anti-corrosion coatings that prolong the “life” of the device. Steel heat exchangers are the most common in the manufacture of boilers. Corrosion is not terrible for copper heat exchangers, and due to the high heat transfer coefficient, low weight and dimensions, such heat exchangers are often used in wall-mounted boilers, but of the minuses, it should be noted that they are more expensive than steel ones.
In addition to the heat exchanger, an important part of gas boilers is a burner, which can be of various types: atmospheric or fan, single-stage or two-stage, with smooth modulation, double.

To control the gas boiler, automation is used with various settings and functions (for example, a weather-compensated control system), as well as devices for programming operation and remote control of the boiler.

The main technical characteristics of gas heating boilers are: power, number of heating circuits, type of fuel, type of combustion chamber, burner type, installation method, pump and expansion tank, boiler control automation.

To determine required power gas heating boiler for a private country house or apartment, a simple formula is used - 1 kW of boiler power for heating 10 m 2 of a well-insulated room with a ceiling height of up to 3 m. If heating of a glazed basement is required winter garden, rooms with non-standard ceilings, etc. the gas boiler output must be increased. It is also necessary to increase the power (about 20-50%) when providing a gas boiler and hot water supply (especially if water heating in the pool is necessary).

The peculiarity of calculating the power of gas boilers: the nominal gas pressure at which the boiler operates at 100% of the power declared by the manufacturer, for most boilers is from 13 to 20 mbar, and the actual pressure in gas networks in Russia can be 10 mbar, and sometimes even lower . Accordingly, a gas boiler often works only at 2/3 of its capacity, and this must be taken into account when calculating. In more detail with a table for calculating the power of a heating boiler, you can

Most gas boilers can switch from natural gas to LPG(ballooned propane). Many models switch to liquefied gas at the factory (check these characteristics of the model when purchasing), or nozzles (jets) are additionally supplied to the gas boiler to switch to bottled gas.

Pros and cons of gas boilers:

Boiler piping- These are devices for the full operation of the heating and water supply system. It includes: pumps, expansion tanks, filters (if necessary), manifolds, check and safety valves, air valves, valves, etc. You will also need to purchase radiators, connecting pipes and valves, thermostats, a boiler, etc. The issue of choosing a boiler is quite serious, so it is better to entrust the selection of equipment and its complete set to professionals.

What is the best boiler? The Russian market of gas boiler equipment has its own leaders in quality and reliability. The best manufacturers and brands of gas boilers are presented in the assortment:

"Premium" or "Lux"- the most reliable and durable, easy to manage, the kit is assembled as a "constructor", more expensive than the others. These manufacturers include German companies

The most profitable and definitely the right decision during the heating season is to competently equip independent heating of your own home. This allows you to improve the microclimate and achieve maximum cost savings. Gas can help double-circuit boilers heating, equipped with all the required systems responsible for safety and automation.

There will be no doubt about the financial feasibility of the decision to replace outdated equipment with more modern equipment in the first months of its use. At the same time, the house will be as comfortable as possible, without interruptions in hot water and heat in batteries.

A little about gas boilers: advantages and disadvantages

The market share of heating gas equipment is about 75%. The rest includes solid-state, liquid, electrical or universal counterparts. A large category among them are dual-circuit models, represented by a wide variety on the market. Each of the devices is characterized by similarities and differences in design features.

Introductory video lesson

If you choose the right model, taking into account all its main indicators and characteristics, it will provide heat to all rooms in the house. One of the main advantages of double-circuit gas boilers is versatility. Among other positive aspects, it is worth noting:

• The ability to automate the boiler saves the owner of the house from worries about heating
• Provides maximum security
• The boiler supplies the house not only with heat in heating radiators, but also with hot water supply (DHW)
• Boilers are compact in size, some models can be hung in a convenient place on the walls, while they do not need a separate boiler room
• Relatively low cost

However, looking at the positive aspects, it is worth highlighting several disadvantages:

• Even with the ability to easily organize hot water supply, you will have to wait until heated water flows from the tap
• Normally, a double-circuit boiler is capable of providing hot water only one point in a certain time period
• At the same time, the equipment is not able to heat the premises and provide the DHW line, priority belongs to the second operation
• The heat exchangers installed in modern models are very unstable to hard water: the higher the pH value, the shorter their service life.

The device of a double-circuit gas-fired boiler

The market is rich in a variety of models, which are gas double-circuit heating boilers from a wide variety of manufacturers. Some of them are similar to each other, others have many important differences.

One of the main differences between double-circuit heating boilers is how the heat exchanger is arranged, which transfers the heat released by the combustible fuel to the coolant. This element in most models is placed at the top of the equipment, under which the burner is located.

When the fuel burns, it releases upward heat. The latter heats the heat exchanger through which water circulates. Heat exchangers can be made of stainless steel, aluminum or copper. However, stainless steel models are considered the most common and resistant to aggressive coolant.

Conventionally, double-circuit boilers can be divided into the following two categories:

1. With bimetric heat exchanger
2. With two heat exchangers

Bimetric heat transfer models are a "pipe in pipe" system. The main external circuit is necessary to ensure the heating of the coolant flowing inside the second circuit. The main advantage is low cost, however, too high a thermal load can disable the equipment after a short 6-7 years.

Double-circuit gas heating installations with primary and secondary heat exchangers are much more reliable, but they are characterized by a more significant cost. This construct works like this:

1. As a primary heat exchanger, a system of copper tubes is used, on which copper plates are soldered - it is necessary for heat transfer
2. A secondary type heat exchanger (its second name is plastic) is designed to transport heat between the coolant and water to provide a DHW line
3. When hot water is needed, the coolant moves in a closed circuit inside the boiler, without entering the heating system and giving off heat to the hot water line

Classification of gas double-circuit boilers

It is possible to classify gas double-circuit heating boilers according to various characteristics:

• Design options
• According to the heating method
• How to remove liquid

Design options

The main classification of gas boilers is design features. Depending on the installation method, the equipment on the market is divided into 2 types:

• wall
• outdoor

The most common are wall-mounted models that can be mounted anywhere (in the corridor, in the kitchen or in a separate small boiler room). Low cost and high performance are their main positive features. Such equipment can heat a house up to 350 sq. m.

Any wall-mounted model is equipped with everything required for stable and reliable operation. There is no need to purchase additional expensive large units that expand functionality.

The cost of floor models is slightly higher, but the difference in the money spent will quickly pay off due to high efficiency. Installations of this type are capable of exceeding a power of 20 kW, allowing you to heat a spacious cottage several floors high.

Significant disadvantages of floor models are:

• Large dimensions and weight due to the use of a cast-iron heat exchanger
• The need for a separate room for the placement of equipment and arrangement of interchanges
• More complex care and the need for regular preventive examinations

According to the heating method

Depending on the method of heating water for hot water supply, a gas heating boiler can be of one of two types:

1. Boiler
2. flowing

Models that use separate boilers to heat water to the DHW system are less common. In them, the liquid, before entering the mixer, must be heated in a separate tank.

Flow models are more popular. They are characterized by high power, due to which hot water enters the mixer much faster.

The first type of water heaters is more often used in conjunction with floor models. Flow heaters are installed in wall-mounted units to make them more compact.

How to remove liquid

According to the smoke removal method, divide the double-circuit gas boilers can be divided into two main categories:

• With natural traction
• Forced draft

To organize natural draft, you need a boiler with an open chamber. It will receive oxygen directly from the living quarters. But since this is not always possible, forced draft or turbocharged models are most common.

Calibrated boilers have some advantages over analogues:

1. They use air that is pumped from outside, and not from living quarters
2. High power, thanks to which you can heat up to 12 liters of water per minute
3. Cost-effectiveness and autonomy - all work operations are controlled by automation, which eliminates human influence
4. Good tightness

Power is the main selection criterion

Considering and choosing gas double-circuit heating boilers, it is necessary Special attention draw on their power. If it is too small, the equipment will not be able to fully provide heat for hot water supply and the heating system. Too powerful equipment, in turn, will cause increased costs, failures, condensation, etc.

The easiest way to calculate is to take for every 10 sq. m of residential heated premises, an indicator of specific power equal to 1 kW. In modern insulated houses, this value can be 20-25% less due to reduced heat loss. Toward the north, the situation is diametrically opposite.

Specific power, as a rule, is chosen equal depending on the regional location in which the house is located:

• In the northern regions- about 1.5-2 kW
• In Moscow and nearby areas - 1.2-1.5 kW
• Central Russia– 1-1.2 kW
• Southern areas– 0.7-0.9 kW

In cases where the ceiling height exceeds the standard 2.7-3 m, it is recommended to enter a correction factor of 1.1-1.2.

Several installation features

For a double-circuit boiler with a boiler, any of the heating system piping provided for in the house project is suitable. Some features must be followed when installing equipment with instantaneous water heaters.

It must be remembered that double-circuit flow-type boilers are capable of operating exclusively in the "either heating - or hot water" mode. Priority is given to the DHW line, so if it is used for a long time, the house may become colder.

To make the work of a double-circuit boiler the most practical, it is necessary to adhere to a number of rules:

If there is a nightly electricity tariff, you should consider installing a second electric boiler. Such a solution may seem expensive, but from the point of view of economy, it is justified.

Detailed installation instructions can be

average cost

One of the main exciting questions - how much do gas double-circuit heating boilers cost today? The price range for equipment is quite wide - from $500 to $2000. They depend on specifications and the manufacturer of the installation in question.

If we talk about popular manufacturers, it is worth highlighting the following market leaders:

• DAEWOO (Korea)
• Ariston (Italy)
• Junkers (Bosch, Germany)
• Rinnai (Japan)

Device diagram

Today, bulky boiler thermal installations have been replaced by compact wall-mounted double-circuit gas boilers. These are real mini-boilers, in the body of which there is a heat exchanger, its own pumping system, control devices, tonometers and technical units responsible for the safety of operation. Such equipment is used in private homes, because the characteristics of gas boilers make it possible to organize an autonomous heating system as efficiently as possible. Gas installations have compact dimensions, simple intuitive controls and the necessary set of functions.

How do such devices work?

All wall-mounted gas boilers can be divided into two large groups - single-circuit and double-circuit. The former are used for the installation of autonomous heating systems, and the latter are purchased if, in addition to heating, it is necessary to provide hot water for technical needs.

All wall-mounted double-circuit boilers are arranged quite simply. Inside them are two circuits. The first provides heating radiators with coolant, and the second plays the role of a water supply system. Moreover, the technical characteristics of some models allow the use of the secondary circuit in two modes of operation. It can function together with the heating circuit and separately from it. This function is very convenient in the summer when you need to use hot water without heating the house.

When studying the technical parameters of the device, it is also necessary to pay attention to the principle of operation of the installation. Some manufacturers produce gas boilers that heat water only after the supply tap is opened. cold water. Other manufacturers offer samples operating in boiler mode. In them, water is supplied to a separate tank, and only there it is heated to a certain temperature.

Note! Practice shows that the boiler mode is more economical, but only if a large tank is available.

Other operational features of gas boilers

Modern gas boilers are complex devices, the technical characteristics of which make it possible to ensure both the efficient operation of the installation and the safety of its use. What is being done for this?

Specifications Hydrosta Gasboiler

• Firstly, almost all manufacturers install special protection that protects the installation from sudden power surges. Therefore, thermal equipment can work both when there are only 150 volts in the network, and when the voltage rises above 260 volts. In addition, sophisticated automation controls the level of gas supply. If it drops sharply to the minimum and the flame spontaneously goes out, the technical units independently turn off the gas and block its supply. This is very convenient when the house is left unattended by the owners for a long time.
• Secondly, you can easily adjust yourself. With a properly set mode, a conventional double-circuit boiler is able to heat water up to 37 degrees at a flow rate of 7 liters per minute.
• Thirdly, the dimensions of the described thermal equipment are very compact.

Installation types

It is impossible not to mention the varieties of wall-mounted gas boilers. There are two of them:

1. Bithermic installations.
2. doothermal units.

Boiler Domitech F 32

What are biothermal gas boilers? These are installations consisting of two metal tubes. One is larger and the other is smaller. The smaller diameter tube is inserted inside the larger diameter tube. Hot water flows through the inner loop, which is used for technical needs, and the coolant moves through the outer loop for heating the house. This solution allows you to heat water for heating more intensively, while using its temperature for heating process water.

Duothermic boilers work on a different principle. They have two heat exchange systems independent of each other. Two copper tubes are located on two different sides of the body, each heats up separately and gives off its coolant to different systems pipeline lines. Such installations have both advantages and disadvantages.

Boiler piping

The advantage is that the heat is spent rationally and economically. The downside is that heating is much slower than in biothermal boilers. In addition, the circuits in duothermic boilers are usually made of copper. Limestone deposits often form on it, so magnetic filters must be used to filter the water. They get clogged quite often, so they have to be changed systematically. And these are additional difficulties in the maintenance of installations.

Note! The burners of biometric gas boilers operate only on excess air draft. That is why the water heats up in them much faster. But at the same time, fuel consumption is maximum. About the savings this case do not have to speak. In duothermic heating boilers, the burners operate on natural draft, so the fuel savings are very significant. But the heating of water is 15% slower.

Which model to choose?

It is necessary to navigate when choosing a particular installation, taking into account the area of ​​\u200b\u200bheated premises. The second landmark is the type of water heating. It can be boiler or flow. If you correctly compare the power and volume of the coolant, then it is easy to achieve good performance. A conventional double-circuit gas boiler with a capacity of 35 kW per hour consumes only 3.7 cubic meters. m of gas, while it can heat a house of about 300 sq. m. If you choose a boiler type of boiler, the volume of the tank will not exceed 20 liters.

Installation in the kitchen

When choosing a model of a gas boiler, it is important to consider the following technical characteristics:

1. Installation power. This indicator is calculated by a simple formula - a power of 1 kW is enough for heating 10 square meters. m area. If a double-circuit gas boiler is purchased, its power must be increased taking into account the consumption of hot water for technical needs. As practice shows, up to 40% of the boiler power is spent on heating hot water. Therefore, it is they who should be added to the average indicators - per 10 square meters. m area 1.4–1.5 kW.
2. Setting power control range. This will allow you to control the rate of water heating.
3. Gas consumption.
4. If there is a storage tank, its volume.
5. Type of burner installed.
6. The principle of operation of the heat exchange system.

Note! Gas consumption and plant capacity are directly related. The more power, the more fuel the boilers will consume. But at the same time, it will be possible to heat the water faster.

Connection to a power generator

For those who choose gas country houses, experts recommend paying attention to the anti-freeze function. It will help prevent utility accidents and rupture of heating pipes in case of extremely sub-zero temperatures.

Another important technical feature is the indicator of maximum heating of running water. For autonomous heating, heating of running water to +35 degrees and above is considered the norm. If the installation cannot provide such indicators, it is better to give preference to models with a boiler tank.

The following important technical characteristics are the power supply parameters of the unit. Almost all modern models assume the presence of three types of power:

1. Low-power home boilers have a single-phase power supply - 220 V.
2. Industrial installations have a three-phase connection - 380 V.
3. Non-volatile gas boilers do not require electricity to operate.

Note! When studying the technical characteristics of wall-mounted boilers, it is important to take into account the maximum allowable pressure in the system. Conventional household single-circuit models are designed for a pressure of 3 bar, and double-circuit boilers can withstand a pressure of 6 bar. Experts recommend purchasing gas boilers that have a reliable protective system capable of shutting off the water supply when the allowable indicators increase.

Features of connecting and operating gas boilers

Assortment in the store

Modern wall mounts can be easily installed and connected by yourself. Information on how to do this is contained in the instructions and technical data sheet. It also indicates the dimensions of the nozzles, the maximum allowable pressure on them and information about what materials these technical elements can be made of.

Almost all are mounted on a vertical sheer surface at a distance of at least a meter from the floor. It is impossible to fix such equipment directly to the ceiling in a cramped unventilated room.

Double-circuit models are more difficult to install than simple single-circuit ones. To avoid connection errors, it is better to entrust this process to professionals.

Gas heating equipment is considered the safest and most efficient, but only subject to strict adherence to the rules for its operation. What should I pay attention to when using such devices?

Detailed scheme

1. Before turning on the installation, you should check the quality of the draft. If not, the unit cannot be used.
2. Do not use faulty gas equipment. This can lead to injury and even death.
3. It is allowed to start the boiler only if there is running water in the system.
4. During operation of gas equipment, do not close the taps for supplying hot coolant. This can provoke an increase in pressure inside the device, which will certainly lead to a breakdown.
5. After installing the unit, make sure that all options and functions work properly. It is important to check whether the automatic shutdown of the gas supply is working, and after how long this option is triggered - the supply must be shut off within 10 seconds.
6. When installing, maintaining and repairing the selected model, manufacturers strongly recommend that you use all the technical documents attached to it and strictly follow the operating rules specified in them. Only then can the safety of the installation be guaranteed.

Generalization on the topic

The popularity of wall-mounted gas boilers is understandable. Small mini-boilers are able to solve a wide range of problems. However, they have overall dimensions. In order for such equipment to work properly and efficiently, it is necessary to study in detail the technical characteristics and know what to focus on when choosing it. Connection features, device power, burner type, version, scope of use - this is not a complete list of criteria that should be taken into account when buying thermal equipment.

The price of a gas double-circuit boiler for heating a private house depends on the technical characteristics of a particular model. First of all, you should pay attention to the calculation of the power required to heat your apartment or house. Here, one should take into account not only the general quadrature, but also a lot of other factors (windows, wall thickness, thermal insulation, and so on). If we talk about the provision of warm water, then it is also worth paying attention to the amount of its consumption. For example, a turbocharged double-circuit gas boiler in St. Petersburg is in great demand today, since such models have high power with compact dimensions.

If you decide to buy gas double-circuit boilers for heating a private house, you need to pay attention to the following differences between this equipment:

• traditional heat exchanger by means of convection;
• open combustion chamber, where the mechanism runs on natural draft;
• a closed chamber with a built-in fan;
• condensing technology, which uses an additional heat exchanger that uses heat from burnt energy carriers;
• wall models, characterized by minimum overall dimensions;
• floor standing boilers, with greater power, therefore, they are often used for heating large private houses or industrial premises.

Double-circuit gas boilers for heating a private house

You can buy a gas double-circuit boiler for heating a private house at the manufacturer's price in the Tekhnodom online store. We provide only original products with a manufacturer's warranty, so when buying from us, you can not worry about the durability and quality of your purchase. Products presented in the online store are distinguished by the following advantages:

• profitability;
• versatility and rich functionality;
• durable and reliable work;
• convenient control functions.

You can buy a double-circuit gas boiler for heating a private house, the price of which suits you, in just 1 click. If you have any questions regarding the features of the operation or installation of a particular model, call the phone numbers listed on the website. Our experts will provide you with professional advice on all issues of interest.

You can also buy a gas double-circuit boiler for a private house in St. Petersburg and Moscow at the company's representative offices, the contact details of which can be found on the website.

With the development of gasification of the country, more and more consumers are switching to heating residential premises using natural gas.

If boiler rooms are built to heat industrial enterprises, public buildings and apartment buildings, then a private household or cottage is heated using a gas boiler.

At heating system design all stages of work are important from project development to its installation at the consumer, but the most important part is the choice of a gas boiler.

• What should you pay attention to when choosing it?
• How to determine the optimal parameters of the boiler for your home?

To do this, you need to know the general characteristics of gas boilers heating. Let's try to figure it out.

1. Power of the gas boiler (characteristics of gas boilers)

First of all, it is necessary to determine the power of the boiler, since this one of the decisive technical characteristics. It is selected based on the magnitude of the heat loss of the building. The calculation of the heat balance of the house, taking into account the features of its design, should be carried out by a specialist, however, for an approximate assessment of this parameter, if the house building is designed taking into account building codes, you can use the following formula:
Q = k V ∆T
1 kWh = 860 kcal/h
Where
Q - heat loss, (kcal / h)
V is the volume of the room (length × width × height), m3;
ΔT is the maximum difference between the air temperature from outside and inside the room in winter, °С;
k is the generalized heat transfer coefficient of the building;
k \u003d 3 ... 4 - building from boards;
k = 2…3 - brick walls in one layer;
k \u003d 1 ... 2 - standard masonry (brick in two layers);
k \u003d 0.6 ... 1 - well-insulated building;
Calculation example:
For a building with a volume of V = 10m × 10m × 3m = 300 m3;
At ΔT \u003d (Tvn - Tnar) \u003d 20 - (-30) \u003d 50 ° С;
The heat loss of a brick building (k = 2) will be:
Q \u003d 2 × 300 × 50 \u003d 30000 kcal / h \u003d 30000 / 860 \u003d 35 kW
This will be the required minimum power of the boiler.
Usually, a 1.5-fold power reserve is selected, however, factors such as constantly working ventilation of the room, open windows and doors, a large glazing area, etc. should be taken into account. If you plan to use a double-circuit boiler (space heating and hot water supply), then its power should be further increased by 10 - 40%. The additive depends on the amount of hot water consumption.

2. Factors affecting the power of a gas boiler (characteristics of gas boilers)

• First of all, these are seasonal peak loads. With an increase in gas consumption by consumers, the working gas pressure in the network may decrease and the boiler will not produce the parameters stated in the passport.
• Strong salinity, hardness of the supplied water (scale on the inner surface of the heat exchanger).
• Long-term operation of the boiler without preventive cleaning of scale in the heat exchanger, soot and soot on surfaces from the gas side. Usually the first cleaning is carried out after 3 years of operation, however, the timing largely depends on the quality of the water and the intensity of operation of the equipment.
• Frequent use of hot water. You should be aware that when heating water for household needs, up to 85% of the boiler's power is spent.

3. Which boiler to choose wall or floor? (characteristics of gas boilers)

This issue is discussed in detail in the article:. But to put it in a nutshell, then by its design floor gas heating boiler differs from wall, first of all, the parameters of the heat exchanger, the material from which it is made and the range of generated space heating power.

Floor boilers have a massive heat exchanger made of cast iron or high-alloy steel. Cast iron heat exchanger is more fragile than steel, but it is more durable in operation. Boilers with a steel heat exchanger are lighter, less damaged during transportation and installation at the consumer. The power of floor boilers reaches thousands of kW. The weight of the boiler is about 100 - 150 kg. Large capacity boilers are supplied with additional external equipment (pump, security system, expansion tank). Most often they are in a separate room of the house (boiler room). Here is a detailed brief description and evaluation of brands presented on our market.

heat exchanger wall boiler made of copper tubes, so it has a shorter service life. The power of wall-mounted boilers does not exceed 35 kW, weight 30 - 50 kg. The wall-mounted boiler can be installed in the household premises of the house: kitchen, bathroom. It is quiet and does not take up much space. Actually - this is a miniature boiler room with a heat exchanger, an expansion tank, pumps for pumping water, a ventilation system and a control unit.

New direction - condensing boilers. They are more powerful than traditional wall boilers are produced with a capacity of up to 100 kW), have a heat exchanger made of steel pipes, the resource of which is 2.5 times longer than copper, but condensate must be drained into the sewerage system. The efficiency of such boilers is higher than that of conventional ones. You can read more about this in the review article, which describes their principle of operation.

4. Gas boilers according to the type of combustion chamber design (characteristics of gas boilers)

For closed combustion chamber(turbocharged boilers) oxygen is supplied through an external coaxial pipe, which is a two-loop pipe (pipe in a pipe), brought out through a hole in the wall. Exhaust gases are removed through the internal contour of this pipe.

For open combustion chamber oxygen comes from the room in which the boiler is installed, the products of combustion of gas fuel are removed through the ventilation system of the building. This method requires the flow of air into the boiler room.

5. Single and double-circuit gas boilers (characteristics of gas boilers)

In the presence of a gas boiler, it is natural to satisfy the need for hot water using its power. To heat water for domestic needs, a double-circuit boiler is most often used, in which a flow heat exchanger is installed, sometimes with a small boiler. For single-circuit boiler an external boiler is mounted and hot water is taken from it.

6. Profitability and safety of operation of gas boilers (characteristics of gas boilers)

Natural gas boilers are characterized by high efficiency. fuel usage: 90 - 95%. The gas boiler control system has several degrees of protection:

• Burner flame control. The gas is turned off if the flame goes out.
• According to the pressure of the supply gas. When the gas pressure drops below the critical value, its supply will be turned off.
• In the event of a power failure, the gas supply valve closes.
• According to the required air temperature in the room. In the thermoregulation mode, the boiler is switched on / off when the limit values ​​of the air temperatures in the room, set by the user, are reached.

Depending on the type of performance ( economy, comfort or elite), additional features or improved hardware design are possible.

What affects the efficiency of the boiler, what parameters you should especially pay attention to, how to achieve the maximum return from the boiler, we described in the article.

It should be noted that the price for gas boilers of the same class is somewhat different for different manufacturers, however, it is determined primarily by the type of manufacture of the product. The most expensive will be a boiler in an elite version.

Afterword

Now, having understood and determined for yourself the optimal characteristics of the gas boiler suitable for your needs, you can safely proceed to the search and selection of a specific model, which allows you to make ours, where each model has a detailed description and reviews of users who have bought a specific model. Having wandered through the catalog, you will get an idea of ​​the cost and range of models presented on our market, which is important. Also, when choosing, pay attention to - what exactly is the warranty, its terms, operating rules for the warranty period, specifics of service.

Remember that the boiler is the center of the heating system of the building, therefore, when choosing it, be sure to consult with specialists, however, it is better to consult with a specialist having a basic understanding of the options and characteristics based on which the price is formed.