Content

If there is no possibility to connect a country house or a cottage to a central heating system and hot water supply, homeowners are installed a heat generator, which can simultaneously heat the heat carrier and water for the DHW circuit - independently either in the complex with an external boiler. Consider the principle of operation of the two-circuit gas boiler to assess the advantages and disadvantages of this equipment.

Types and features of dual-circuit gas units

Manufacturers of gas boiler aggregates offer a wide range of models that differ in the following parameters.:

• design (condensation and convection heat generators, the second option is distinguished by an increased efficiency, but more expensive and more difficult to maintain);
• power;
• version (outdoor or wall units);
• the type of heat chamber (atmospheric or closed, in the first case requires the installation of a classic chimney, the second is used coaxial);
• ignition system (piezoelectric element either electrojiggig).

Unlike a single-mounted heating boiler, dual-circuit models also differ in the principle of preparation of hot water. To choose such equipment should be taken into account the functional parameters of the heat exchanger for the DHW circuit.

Condensation floor double-circuit gas unit

Models with a bietermic heat exchanger

The principle of operation and the device of the unit equipped with a bitter heat exchanger is based on the configuration of the heating element itself. The heat exchanger is made of copper and has a complex configuration - in fact it is a curly tube inside an oval tube. The external sections move the coolant, on the tube inside - water for the DHW. The heat exchanger heats up with a gas burner operating under the control of the automatic valve.

The principle of the boiler is as follows: while the unit works in heating mode, the burner heats the coolant to the set temperature and turns off to turn on again when the fluid in the external heat exchanger tubes will cool up to a certain level. This allows you to maintain the set temperature of the heating circuit in the house.

When the cerave with hot water (one or more) is opened, the fluid movement along the inner tube of heat exchanger begins. In this case, the valve overlaps the flow of the coolant into the outer circuit and the heated liquid circulates in the heat exchanger, intensively giving it heat in the inner tube, from where it enters the DHW pipeline. The burner at the same time works continuously.

After the hot water cease to spend, the valve that blocks the outer contour of the heating opens, and the coolant again begins to circulate, passing through the heating devices.

The advantages of the two-circuit boiler of this type include compactness (the Bi-Letter heat exchanger takes less space compared to monotermic), lower cost. The shortcomings are included:

• water heating for household needs to the temperature of the coolant - if the limiter is not installed, you can get a burn;
• the circulation of DHW and the coolant alternately stop, which increases the risk of salt deposits in the inside tube of the heat exchanger, in the heating devices and the external contour pipes;
• at the Bi-Letter Heat Exchanger, there are many joints, which increases the risk of leakage, while the element is practically not maintainable.

Bi-Letter Heat Exchanger Double-Circuit Boiler

Operation of equipment with a bitter heat exchanger is justified in conditions of low hot water consumption. Otherwise, the aggregate will not have time to warm it up to acceptable temperatures.

Models with flow heater

The principle of operation of gas boilers, which includes a flowing heating element, is the transmission of thermal energy "from water to water". The scheme involves the use of a three-way thermostatic valve responsible for switching the flow of the coolant from the main water heating circuit into the secondary or in the heating system. Also, the design of the unit includes a circulation pump and two expansion tanks (for heating and DHW circuits).

Consider the principle of functioning of the unit. In standard mode, the main heat exchanger consisting of a copper tube and steel plates is heated with the help of the burner. The liquid that passes through it provides the heating of the premises. When the consumer opens the crane with hot water, the control unit receives information from the flow sensor and switches the three-way valve equipped with an electric drive, to work the system in the DHW mode.

This means that the fluid passing through the main heat exchanger ceases to enter the heating circuit and forcibly circulates inside the boiler, heating water for the DHW in the secondary (plate) heat exchanger. At the same time, flows are directed in the oncoming direction to ensure maximum transmission of thermal energy from the coolant to water for the DHW. After the consumption of hot water is completed, the coolant again begins to flow into the outer contour.

The device of the boiler with a dual heat exchanger and two heat exchangers

The advantages of models with a flow heater can be attributed:

• the ability to adjust the degree of water heating for the DHW;
• high speed of hot water preparation;
• durability of monotermic heaters in comparison with the bittermic.

The lack of an aggregate of this species is the same as in the previous version - a long stop of the heated fluid in the circuits provokes the occurrence of deposits.

Models with a flow heater and a full-time boiler

The device and the principle of the functioning of units with a built-in boiler differs from previous options, where there is a regular shutdown of the burner in the heating mode of the boiler. To maintain the temperature of the coolant in the specified range, the burner does not need to work constantly - to turn it on and off the controller receiving signals from the temperature sensor is provided.

A double-circuit boiler, in the design of which the boiler enters, in pauses between the heating cycles of the coolant uses the energy of the burner for heating water in the built-in accumulative tank. The three-way valve at the same time heating the heating circuit from circulation. As a result, the circuit of DHW and heating work alternately, due to the constant reserve of hot water, there is no need to overheat the liquid in the heat exchanger, provoking accelerated salts deposition, and the consumer at any time receives water from the accumulative container heated to a given temperature.

Dual-circuit gas unit with built-in boiler

This principle of operation of the two-door gas boiler provides economical gas consumption and comfort during equipment operation. The unit for functionality exceeds the boilers of a different type, and has the only drawback - the high cost.

Features of the device of double-circuit units

The device of the two-circuit gas boiler allows the unit to function in two modes, ensuring heating of the coolant and water for economic needs. The basis of the design of the outdoor or wall gas heat generator is represented:

• the housing equipped with a thermal insulation layer;
• burner;
• heat exchanger;
• circulation pump;
• automation responsible for the operation of equipment and safety.

Gaseous fuel combines in a special chamber, highlighting heat and oxidation products. Heat is used to heat the heat exchanger, combustion products are removed through the chimney, pre-passing along the heat exchanger and giving it the main part of thermal energy.

Water heating for the DHW double-circuit boiler is provided by using a dual plate heat exchanger (including complete with a storage capacity) or a bietermic heat exchanger.

The device of the dual-circuit boiler NAVIEN

Functioning aggregate

The description of the principle of operation of the two-kinning gas boiler of heating will help to understand the features of the functioning of the unit, which ensures not only autonomous heating, but also hot water supply.

During operation, the unit does not need to interregate - it is enough to correctly adjust the heating level of the coolant using a regulator if an automatic programmable system with thermal sensors is installed.

Consider how a two-round gas unit works. When the temperature of the coolant is lowered below the specified value (or indoor temperature, if remote sensors are used), the automation starts the pump, under the action of which the coolant is raised in the return pipeline. The heated liquid enters the heating circuit when the required pressure is achieved, the relay is triggered and the burner is started.

The process of starting and operation of the boiler is controlled by a microprocessor. When the coolant in the circuit heats up to a predetermined temperature, the burner goes to work in modulation mode or wait. The cycle is repeated when the temperature will fall below the specified values.

The circulation pump ensures the transportation of the coolant in the circuit, the function of the three-way valve - turn off the heating circuit from the coolant supply when it is prepared with hot water in the heat exchanger. To this end, the coolant moves inside the boiler for a small contour, giving heat to water for DHW.

In the summer, when the heating is not required, the double-circuit unit can only perform the water heating function for hot water supply.

Note! The heating equipment of this type is sensitive to the quality of water!

Failures in the work of the unit are usually associated with the heat exchanger of sediments. The precipitate, scale accumulate on the inner walls of the tubes. To avoid problems, it is not recommended to connect the heating circuit for fill and feed directly to the water supply, as well as the DHW circuit. At a minimum, mesh filters should be installed.

Results. Dual-circuit units are automated, which provides convenience of operation and reliability. The benefits of gas boilers also include compact dimensions - wall-mounted models occupy a minimum of space and are suitable for installation in a residential room. The model range makes it possible to choose a multifunction boiler for a suitable price category.

Modern control panel of the two-door condensation gas boiler

The advantage of double-circuit models is the available cost - cheaper to buy one such unit than a set of one-circuit boiler and a direct or indirect heating boiler.

The disadvantages include a relatively small productivity of hot water, especially if we are talking about models without a built-in boiler - if two or more cranes are open at the same time, the unit will not cope with heating to a predetermined temperature. While a separately installed boiler always keeps the sufficient stock of hot water.

Another drawback is energy dependence. The design of the two-kinet heat generator includes a circulation pump, automation, drive for a three-way valve that require power supply. If the house regularly turns off the light due to interruptions in the supply of electricity, it is necessary to provide a backup source of electricity.

Otherwise, dual-circuit boiler units are quite suitable for homeowners who want to create an effectively working offline heating system and DHW without unnecessary financial costs.

It was impossible to introduce a house or an apartment without heating. The person invented many dwelling devices, but gas dual-circuit boilers, having unique consumer properties, are extremely common and occupy up to 75% of the heating equipment market. The market offers boilers of imported and domestic production, the choice of products from different manufacturers is huge. How to choose the most efficient, safe and durable unit for home heating? For example, if you choose a double-circuit gas boiler - what is it and what it is better than other devices?

For comfort in the house of one heating, there is little, because there are still hot water for economic needs, and its feed can provide a two-round gas boiler for heating, which needs to choose. This device is quite complicated, expensive and purchased for many years, so rough errors when choosing a boiler is not allowed. To the question, gas dual-circuit boilers How to choose which very best and reliable, it is difficult to answer unequivocally, because when buying should take into account many different factors.

The modern is a high-tech product that heels housing and serves hot water for the DHW circuit. To minimize human intervention in the operation of the heating system, the aggregates are supplied with complex automatic systems.

The capacity offered in the market of boilers is different, from tens to hundreds of kilowatt, which makes it possible to choose a heating unit for home of any area and storey. The price of gas boilers depends on the brand of the manufacturer, power and boiler model. The design of most models perfectly fits into the interior of the premises.

Dual-circuit boilers at the place of installation are divided into two large groups:

1. outdoor dual-circuit units with high power and weight;
2. wall double-circuit gas appliances.

Outdoor dual-circuit boilers

For private houses with a large area and with several floors in specialized stores or online stores, you can pick up and buy a double-circuit floor gas boiler with a calculated power required for heating a specific home. These units have considerable weight and sizes, therefore, for their installation, a separate room is provided - boiler room.

Models are produced depending on the network and non-volatile. This criterion should be considered primarily before you buy a heating gas boiler, because the power grid can be unreliable or completely absent. It should be borne in mind that the closed heating systems of the complex configuration do not work without, so the uninterrupted operation requires the installation of an uninterruptible power supply (UPS) or a gasoline generator. For simple open systems in which the movement of the coolant is carried out by gravity, there is no dependence on the electrical network.

Types of floor gas boilers:

Wall gas double-circuit boilers

Not so long ago, the Russian consumer was able to acquire a two-round wall-mounted heating boiler. Products of this type have deserved recognition of consumers and in a short time have become popular for autonomous heating. Extremely compacts, they can be entered into any interior or embedded in the closet, making it imperceptible. The capacities of mounted boilers depending on the model - from 13 to 55 kW.

Wall-mounted models of gas boilers, despite small sizes, contain the following nodes and devices:

When choosing a wall double-circuit boiler, you need to try to take into account the set of characteristics for the optimal selection of the model of the unit, which will ensure the heating of the house and hot water.

You should not choose the gas boiler heating wall-mounted double-circuit with a capacity of significantly exceeding the calculated value.

Typically, 20% is added to the calculated power, and for areas with extremely low temperatures in winter to 50%.

The main advantages of dual circuit wall boilers:

Leaders in the market of heating equipment

To understand the trends in the development and demand for heating equipment, leading specialists of companies make analytical reviews in which the ranking of gas double-circuit boilers, those that have had the greatest demand and popularity. Reviews explain in detail why the most demanded models of heating equipment were included in the list of best products.

Recently, a stable tendency is noted - the demand and sale of two-circuit gas boilers increased significantly, especially the new generation boilers. Many companies offer completely new innovative solutions that will create even more advanced products.

Most Popular Gas Boilers in Russia

The popular gas boiler Ross is produced in the Kharkov factory in the form of wall, outdoor and parapet models. They are distinguished by the capacity and number of additional functions. The popularity of Ross boilers is obliged to be affordable and high quality aggregates. You can order the boiler at the factory without intermediaries, which will significantly reduce costs.

Wall double-circuit gas boiler avant-garde with a rating capacity of 24 kW. The boiler in its technical characteristics complies with European standards and has all the necessary certificates. The device is non-volatile with a cast iron heat exchanger and with a manufacturer's warranty - 10 years. In the unit installed Italian non-volatile automation. All components of leading European companies.

Wall-mounted gas boiler Volcano is among the top ten best-selling aggregates in Europe. Models are produced with a power of 7 to 20 kW. All models of boilers volcano are supplied with import automatic, they are relatively inexpensive and designed for the heating of small houses and apartments.

Popular gas boiler The thermotechik is a standard heating device of a simple design. Its technical data is lower than that of advanced foreign samples. But the fact that its price is several times lower than that of imported products, it works steadily and reliably, and determined its extraordinary popularity in Russia.

Of all the above, it is possible to make an assumption that the popularity of wall-mounted double-circuit boilers will increase.

Many manufacturers work on improving productivity, efficiency, safety and reliability of their products.

In many companies that produce heating equipment, the main part of the range is wall-mounted double-circuit boilers intended for the organization of GVS systems and heating houses. It seems that such a tendency will be maintained in the foreseeable future.

Can one device and heat the house, and ensure the presence of hot water in the crane? Yes, if this device is a double-circuit boiler with a built-in boiler (otherwise the "built-in boiler of the DHW").

• 1 of 1.

On the picture:

Diagram of the "double-circuit" boiler: one part is responsible for heating water in the heating system, the other is for hot water from the tap.

The concept of "double-circuit boiler" implies that the unit works for the needs of two systems at once: hot water supply (DHW) and heating. At the same time, many models are arranged on the principle of the priority of hot water. That is, when water starts to spend (open a water tap), the boiler power is redistributed in favor of the DHW circuit. The heat carrier in the heating system does not heat up.

However, there is nothing terrible in such a scheme of work: even with the active use of water for some time, the temperature in the house drops no more than 1-3 degrees.

Double-circuit boilers are nasty and outdoor.

Wall double-circuit boiler It is distinguished by relatively low power and performance. His advantages - compactness and low weight. Wall-mounted two-circuit boilers are well suited for small houses with 2-3 points of water treatment.

The cooking system of hot water in these devices is similar to flow water heaters: they also use a plate heat exchanger, heated due to the operation of the gas or diesel burner. There are accumulative models of double-circuit boilers: inside the boiler there is a small container for several tens of liters. However, the volume of the reservoir in the built-in boiler is small. Such an aggregate, unlike flow, is unable to fully ensure the needs of a large family in hot water. The dual-circuit boiler of the accumulative type can only be installed in the country house.

• 1 of 1.

On the picture:

The wall double-circuit boiler will be located in a small room and will not spoil the interior with its appearance.

Outdoor double-circuit boiler it has a much more spacious cumulative tank for the DHW system. However, its tank rarely exceeds 100-150 liters (otherwise the device body would be unnecessar than large).

Hot water is prepared in the same way as in indirect heating water heaters. The outdoor double-circuit boiler allows you to provide the needs of a family of 4-6 people, despite the houses equipped with 2-3 bathrooms. With more waterproof points, water reserves from the built-in boiler will be insufficient. In this case, it will have to use additional water heaters or to abandon the two-circuit boiler at all, preferred by the independent DHW circuit based on a separate water heater.

• 1 of 1.

On the picture:

The outdoor two-round boiler will have to be taken out in a separate household room, but it will provide a whole home with water and warmth.

What is better: have an independent hot water and heating system or buy a double-circuit boiler?

The advantages of a two-kilt boiler:

• Saving space.
• Below the cost of installing equipment and that. Maintenance of only one device (albeit combined) is much cheaper.
• Two on one system of DHW and heating will work on one fuel line, chimney. They need only one set of control and security automation.
• All inclusive. In most cases, such aggregates are supplied complete with all the necessary additional devices (strapping) - circulating, expansion tanks, etc.
• In the summer, not "Topit" . A double-circuit boiler is very simple to translate from the "Heating and DHW" mode to the "DHW only" mode.

Disadvantages of the two-door boiler:

• Low hot water performance at a double-circuit boiler of any type.
• Forces water saving. Hot water due to the tough restriction of its volume has to be spent very economically.
• Hot water / heating \u003d not proportional. If you enlarge the tank of the tank, you will need more powerful (more expensive) boiler. And this is completely unjustified costs. Indeed, for heating at home, sometimes a quarter of the rated power of the device is sometimes sufficient.

The article uses Sankon.com.ua images, Sogreemdom.com,

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Korean heating boilers

Do not depend on the quality of central heating and hot water sufficient simply. It is only worth installing the boiler at home and independently adjust the temperature and duration of the heating season. And if in apartment buildings the installation of autonomous heating can be prohibited, depending on the floor, then in single-storey cottages and private homes, this is the best solution to the problem of heating and hot water.

The main thing in the system of autonomous heating is of course the boiler. There are several types of them. As fuel, they use both traditional fuel - gas and stone coal and alternative fuel - chip and briquettes. Most preferred for installation in the cottage single and two-circuit boilers.

Single-mounted heating boilers

A single-mounted boiler primarily works on the heating of premises and create a comfortable temperature in them. As can be seen by the title, one contour of the coolant passes through the boiler. If you wish to the source of heat, you can attach a heat exchange device for water heating. The principle of operation of a single-mount boiler is extremely simple. A fuel is entered into the furnace, which heats the coolant circulating over the pipelines inside the boiler. The circulation of the coolant for the heating circuit occurs or due to the temperature difference or with the help of the circulation pump. For high-quality heating of rooms, water circulation in the circuit should be constant.

one-connecting boiler with a connected boiler, hot water comes from a boiler

As for connecting an additional heating circuit, which is outside the boiler, it will not be difficult to connect it. But is there any benefit in this? The thing is that the connection of the boiler for heating water will make the work of the boiler is not stable. This is due to the fact that the amount of heat required for water heating is not constantly during the day. The maximum waterscence falls on the morning and evening hours. The boiler must be rebuilt and served a larger fuel on the burner. After stopping the consumption of the boiler, it remains only to the heating system. Such work of a single-mounted boiler will not be economical and will result in fuel consumption.

Advantages of a single-circuit boiler:

• Such boilers are equipped with an automatic security system. It is it that allows you to choose the optimal mode of operation of the equipment and fuel consumption.
• On the basis of single-circuit boilers, you can create a variety of heating systems with different wiring around the room. The right choice allows you to increase the life of the boiler, as well as improve its specifications.
• Weather regulation sensors are built in new models of single-circuit boilers. This means that from the outdoor temperature, the fuel supply is regulated on the burner, and therefore a decrease or increase in temperature in the supply pipeline.
• The simplicity of the design makes the model of single-mount boilers very reliable and easy to manage and regulate.

Double-circuit boilers

If there is no hot water to live in plans, it is worth thinking about the acquisition of a two-kilt. It differs from one-circuit in that its design provides an additional heat exchanger for heating water. Depending on the power of the boiler, you can organize water heating and feeding it into two water treatment points at the same time. To minimize the cooling of water along the way to the parsing points, the boiler is preferably located closer to them.

There are two varieties of double-circuit boilers: with one or two heat exchangers. In the first case, a coolant for heating needs through the heat exchanger. If it is necessary to heat the cold water, the supply of coolant on the heat exchanger overlaps, and the cold water supply to heating opens. It is not very convenient, especially in the cold season.

Boilers with two heat exchangers are greater popularity. They work independently of each other. In one heat exchanger, heating the heating water is heating, and the heating is cold to the needs of hot water supply. Modern double-circuit boilers are equipped with steel heaters that heat the water in a short period of time.

two-bundle boiler, hot water comes from the boiler

The advantages of the two-door boiler:

• Buying such a boiler will cost a cheaper kit consisting of a single-circuit boiler and boiler.
• The boiler is compact enough.
• Water is not recruited in a cumulative tank, and exactly the amount of water that is currently being needed is heated. This allows you to reduce heat loss due to cooling.

How to choose the boiler of the corresponding power

If the choice in favor of one- or two-kilt boiler is already made, then it is necessary to choose the boiler of the corresponding performance. In order for the air temperature in the rooms was comfortable and the temperature of hot water about 50 degrees Celsius can produce the simplest calculation of the power of the installed boiler. For this, the area of \u200b\u200ball heated rooms is summed up and divided by 10. This obtained an approximate heating load. By increasing it by about 15-20%, we have the total boiler power, taking into account hot water supply. However, how professionals advisors The boiler should be purchased with a slightly greater productivity than was calculated. The fact is that over time, the performance of the equipment falls, the heat transfer from fuel to the coolant decreases, due to the contamination of the heating surfaces. In addition, when selecting equipment, the magnitude of thermal losses from pipelines should be taken into account, possible voltage drops.

Boiler manufacturers - what model is better?

In the manifold of brands offering their products easy to get confused. How to choose a boiler and not mistaken with the choice. Now in the market of thermal power products mainly proposed equipment of several countries. This is Germany, Italy, Korea and Russia. All boilers have some differences related to the technical characteristics of the work and also significant differences in the cost.
German heating boilers.

Bosh boilers have proven themselves for a long time since the best side. Their design is constantly improving. The boiler is equipped with automatic and security devices that adjust the fuel supply to the burner and are triggered in case of an emergency. To improve the heat grinding in the process of operation of the boiler, all heat exchangers are made of copper, which are covered with a special composition to prevent corrosion process. The estimated service life of such a boiler is 20 years.

Another German firm producing high-class boilers is company Viessmann.. They specialize in the release of both the same dual-circuit boilers. Their equipment characterizes excellent assembly and specifications. According to the claimed characteristics of the efficiency of such boilers reaches 93%. In addition, the company's engineers have developed a unique design of the chimney, which prevents the condensation of flue gases in the pipe and as a result of their freezing.

Italian heating boilers

The boilers of Italian firms also differ in good quality assembly. One of the most famous Italian brands is Beretta, produces high power boilers. In the model range you can choose the heating equipment with a capacity of up to 24kvt. It can be like single-mounted, double-circuit boilers, boilers with built-in and detached boiler. The distinctive feature of the Beretta equipment is that it can also work at very low outdoor temperatures.

Baxi on the heating equipment market for several years. During this time, experts constantly develop and implement new solutions. In the fifth generation boilers, an atmospheric type burner is installed, which works almost silently. BAXI equipment is represented by a wide model number of 10 to 80 kW. Boilers have a relatively small size and a large efficiency - up to 90%.

Korean heating boilers

Korean production boilers combine modern technology and reliability. They are equipped with protection systems from voltage drops, increase pressure and temperature in collectors. Also in the boiler built in the leakage leakage of natural gas. When it is detected, the automation of the boiler will block the gas supply to the burner device.

Navien company occupies a leading place among the manufacturers of boilers. It produces boilers working in a variety of fuel with different number of contours. The equipment is equipped with burner devices that work even at low pressure of natural gas. In addition, a voltage stabilizer is built into the boiler, which protects the system from overloads.

Olympia specializes in the release of double-circuit boilers equipped with a weather regulation system. The range of power models of this brand is quite wide, which allows you to choose a boiler for the room of any area. All boilers are equipped with a newest automation system that allow you to smoothly adjust the operation of the equipment and even protect the system from moving.
Boilers of domestic production.

Danko boiler equipment regularly receives good reviews from users and experts. From the model range represented by the company in the range from 7 to 15 kW, you can easily choose a boiler for heating a small country house or apartment, in the presence of permission. The boiler unit is equipped with a gas filter, steel heat exchanger and microfacled economical burner.

Another company producing competitive boiler equipment, JSC Borinskoe Ischma BSK. A distinctive feature of these boilers is that they are produced with a built-in circulating pump. At the same time, the work of the boiler is possible both at the working pump so without it. This is very convenient with frequent interruptions of the supply of electrical energy.

What to pay attention to when buying a boiler

1. Burner. It is from it that the economical work of the boiler depends. It is important that the design of the burner contributes to the quality mixture of gas and air, which means that the full combustion of fuel without a chemical nosta. The most economical are automatic burners with a built-in fan. Before serving in the furnace, the gas is mixed with air, and then fed to the boiler. The disadvantage of such a burner is an additional noise generated by a fan.
2. Heat exchanger. The quality of heat transfer depends on the material of heat transfer from the combustion products to the medium. The optimal choice will be a heat exchanger made of steel or copper. They are distinguished by high thermal conductivity and resistance to aggressive environmental influence. In addition, it should be borne in mind that under the influence of high temperatures and corrosion, its elements often come out. The more famous brand of the boiler is the easier to choose the item for replacement.
3. Electronics and automation. The boiler is equipped with sensors and allows you to adjust the operation of only by pressing several buttons, simple and easy to operate. But it is worth considering that when the electricity is disconnected, the boiler protection will work and the fuel supply will be stopped. Equipment should be selected on which it is possible to manually regulate its operation in any cases.

According to customer reviews, they are considered, in their opinion, the boilers of German and domestic production. They are easy to serve. Repair also does not represent difficulties, as there are many service centers that order components and parts for repair directly from the manufacturer. The boilers of Italian brands, on the contrary, caused complaints from consumers due to the short warranty period, difficulties in repair and selection of spare parts.
It is important to take the choice of the boiler carefully. After all, he will serve not one dozen years and will create a feeling of comfort and comfort with winter evenings.

Dual-circuit gas boilers - device and principle of operation

The highest use of heating equipment is found in private cottages that are not connected to the hot water system and have autonomous heating. Residents of such households have to acquire electric water heaters or double-circuit gas vehicles.

In this case, the advantage on the side of the latter, which is due to their constructive features and, as a result, the possibility of preparing the necessary volumes of hot water in the shortest possible time. We will try to explain the principle of operation of the two-king gas boiler so that you can make the right choice.

Types of boiler equipment

Modern boiler equipment is presented in a large assortment. It not only has various manufacturers, but also essential constructive and functional differences. If we consider gas devices, then they are

Moreover, each type contains various models. Depending on the design features, they can be:

• single-mounted
• double-circuit

If the first are used exclusively for the heating of premises, then the second functionality allows the preparation of hot water in the required quantity. Moreover, this ability does not in any way reflect the heating of the room.

Gas apparatus device

All heating boilers have the same main nodes and differ, as a rule, in detail. If we consider their drawings, then all of them consist of the heat insulated housing, within which there are:

• heat Exchanger
• burner
• automation

As for the burner, its shape and design differ in devices working on different types of fuel. For example, in gas models, it is a chamber in which fuel is combustion with heat excretion and oxidation products.

Its main function is the production of the energy required for heating the coolant. The heat exchanger is located with a burner - this container with the coolant.

The combustion products rising along its walls transmit heat water, which is then distributed through the pipes of the heating system. At the same time, cooled combustion products come into chimney and outward.

Depending on the design features of the heat transfer device distinguish the devices:

• with dual (lamellar)
• with bittermic

Consider the features of each of them. A dual heat exchanger consists of two. One - for the contour of heating, it consists of copper pipes and plates, the surface of which is covered with a special protective layer protected from corrosion. Its main function is heat transfer.

The second - carries out the preparation of DHW. It consists of plates, they transmit heat into the heated medium. For his design, he received the name - plate.

Bi-meter heat transfer device is a pipe in a pipe. Moreover, its internal part is used to prepare hot water, and the outer - for heating the room.

Not a small value for gas devices is also played by the ignition option. This device is responsible for burning fuel. Rosge can be two types:

At the same time, it is necessary to take into account the flow of air into the combustion chamber. There are several options. For open - air is served from the room. In closed cameras, both natural and forced ventilation can be used.

From devices, be sure to be used in most gas devices, it remains to consider automation. It controls the work of all the components of the apparatus and in the latest models is made on microprocessor systems. This allows you to control the operation of the device by setting the necessary program, everything else is performed automatically.

Operating principle

The device of the two-king gas boiler allows it to work in two modes:

• heating
• cooking GVS.

In the first case, heating the coolant located inside the heat exchanger. In its quality there is ordinary water. Depending on how hot it should be at the output and heated - from 35 to 80º C.

The heating mode is launched by a thermostat that responds to a change in the room temperature. When it decreases it transmits a signal to start the pump, which creates a vacuum in the return pipeline. This process leads to the fact that the water heated in the heat exchanger enters the heating system, while the pressure is taken into account if it is more than 0.45 bar, the contacts of the relay and the ignition of the burner are circulated, which controls the microprocessor.

Next, the boiler begins to work at the minimum power, gradually increasing it to the maximum. If at some stage heating the coolant to a predetermined temperature, the device switches to modulation mode. In the case when at the initial stage, the power turns out to be high, the electronics turns off the burner and allows its next ignition only after 3 minutes.

The combustion chamber is a metal container coated with a layer of thermal insulation material above which the copper heat exchanger is located. At the same time, the burner is located in its lower part. It is mounted automatically at the moment. When the water heated is needed. Together with it turns on the pump used to forced circulation of the coolant via the system pipeline.

When the specified parameters are reached, the gas supply is automatic and the apparatus transition to standby mode. With the subsequent decrease in the temperature from the thermal sensor, the signal is received on the valve, which opens and passes the fuel in a larger volume, which leads to a roasting of the burner.

To prevent water from entering the second circuit, a three-way valve is used. The heated coolant is supplied to the heating system from the boiler through the feed line, and returns through the reverse.

Since the water in the first heat exchanger moves along a closed contour, it practically does not form a plaque. In the second, there is a fluid supply from the pipeline which has a large number of impurities, which can lead to a breakdown of the device. At the failure of the DHW circuit, the device can be operated in heating mode, which is relevant during the cold season.

Device operation in DHW mode

In the warm season, when there is no need for heating the room, the boiler can be included on the summer mode. In this case, only the contour of the DHW will function.

The principle of operation of the gas double-circuit boiler in this mode is as follows: The three-way valve overlaps the heating line, and the coolant from the primary heat exchanger is supplied to the secondary one.

Passing through it, cold water heats up and falls into the circuit of the DHW. This process is started using a pressure relay, which closes at water consumption exceeding 2.5 liters.

First, the command is automatically served on the burner ignition, and then the gas valve opens and gradually power increases to the maximum. The device works in a given mode until water is heated, and then goes to the smooth regulation step.

Moreover, the burner is adjusted automatically to the amount of fluid consumed. Its shutdown occurs when the temperature is exceeded by 5º C, and the inclusion - with a decrease in 1º C.

When operating in this mode, the contour of the heating is turned off and the heat from the burner is transmitted by a fixed heat carrier, and through it in the circuit of the DHW.

Filver and convenient

Having considered the principle of operation and the device of two-circuit gas boilers can be concluded relative to their application:

1. first, they allow you to save money and avoid acquiring water heating equipment
2. secondly, even when the secondary circuit fails, they can work in heating mode, which allows them to be used in the cold season
3. thirdly, the replacement of this circuit will cost cheaper than the repair of a similar bitterm.

Consequently, the use of a two-circuit gas boiler is not only convenient from the point of view of its functionality, but also profitable.

Advantages and capabilities of double-circuit boilers

The use of gas boilers has long been considered to be the most practical solution at once two problems # 8212 heating and hot water supply at home. In modern private housing, this is actually the best way out of the situation. In apartment buildings, a double-circuit gas boiler is installed as a spare option (with frequent interruptions with hot water, the danger of defrosting the old central heating).

What are the advantages of the gas boiler?

• The device does not require a separate boiler room, it can be safely mounted directly in the kitchen.
• Due to the economical consumption of fuel, double-circuit units justify themselves for the year of work
• Modern heat generators are equipped with a multi-stage security system that protects them from overheating in the event of a water pump breakage. The device itself turns off the burner if the flow of gas for some reason is interrupted
• All the latter, including gas floor boilers have an external temperature sensor, an electronic filling that supports the required level of heat, regulating the heating intensity.

Dual-circuit boilers not only heaten the room, but also provide a DHW. The device can heat the flow water or have a drive.

Some electric heating boilers are equipped with separate gas supply for water heater and housing heating, which makes it possible to use DHW regardless of heating.

Principle of operation of contours of the device

In the system of automatic control of contours of the device, priority is given to hot water supply. As soon as the user opens the water supply faucet, the heating circuit is turned off, the burner begins to work only on the DHW. Water heats up in flow.

If hot water is often needed and in large quantities, it is better to install gas double-circuit boilers with an integrated boiler. In this case, it is possible to avoid long-term disconnection of the heating circuit, and as a result, decrease in temperature in the apartment.

In addition, such boilers are able to keep in stock and 70 liters of hot water. Their drives are protected from scale and adequately work even with a small water pressure. If there is a significant consumption of hot water, an indirect boiler with a volume of up to 1000 liters can be connected to a two-circuit boiler.

Wall boilers

Outdoor gas boilers are more often used in country houses, and wall-mounted - in apartments. The modern gas wall-mounted heating boilers have small dimensions and sufficient bandwidth, so massive boilers should not be purchased. It practically does not affect performance. All manufacturers today seek to reduce the mass of heat generators so that they can be placed in any, the smallest room.

Solid fuel boilers are significantly losing gas in performance and efficiency. At the same time, it is not so important, natural or liquefied gas - wall-mounted two-circuit heat generators are much economted and justify their cost in a couple of years.

The principle of operation of the two-killets

The cost of dual-circuit units is higher than one-contact, but do not forget that the double-circuit unit provides more hot water supply.

Technical device of the gas wall instrument:

• Housing
• Burner
• Heat Exchanger
• Water pump for water circulation on the heating system
• Expansion tank

When installing the boiler, it remains only to bring the pipe to mixers and to the entrance to the heating system.

Boilers differ in the type of burner.

If the burner is open, it is necessary to bring the chimney working on the principle of natural traction. Oxygen for the burner is closed from the room where the boiler is installed, so a constant flow of fresh air is required.

The closed burner requires a coaxial chimney (pipe in a pipe) through which oxygen comes and combustion products are displayed. The system is activated using forced thrust, by means of a fan embedded in the boiler. Pipe comes out of the room through the wall.

Choosing a boiler

First of all, it is necessary to calculate the power of the heating boiler. This indicator is measured in kilowatts and indicates what area can the boiler be able to drop. It should be noted that at the consumption of energy into two circuits on 10 square meters of living space, it will take from three kW of boiler power.

It is better if the heat generator has several outputs, especially if it is purchased for a country cottage. This will allow you to connect additional nodes and devices: warm water floors, indirect boilers, swimming pool heat exchangers, supply canorifers.

Electronic ignition burner preferably Piezorozaga. There will be no need to approach the boiler every time to ignite it: you can drive both automatic and remote span. In addition, there is no constantly burning outstanding device, which is important in terms of security. Also, to protect against jumps it is better to use a voltage stabilizer for the boiler.

As for security, it is better to buy a boiler with additional support for the reliability of work - the gas does not forgive errors.

The modern device has the following danger warning functions:

• Blocking thermostat # 8212 turns off the gas supply during water overheating
• Flame sensor - turns off the gas supply when the fire is attenuation
• Traction control sensor
• Disconnection device with insufficient coolant level
• Blocks that are triggered when the gas supply is disconnected when the power supply drops, when the water supply is disconnected

All these systems protect the residential complex from fire and explosion. When taking the specified parameters, the gas boiler will relogate the house for many decades.