The boiler is cast-iron solid propellant double-circuit. Double-circuit solid fuel boiler

Today, the range of heating equipment operating on different types fuel, quite diverse. You can easily buy boilers for gas, diesel fuel, electricity. However, our country traditionally prefers traditional solid fuels - wood and coal.

Such boilers do not require permits for installation, and our goal is to tell you how to choose them correctly.

AT countryside such equipment is often used not only for heating, but also for hot water supply. Therefore, we will consider just such boilers in our review, focusing on their technical characteristics.

Equipment Features

Before purchasing any boiler model, answer three questions for yourself:

• What fuel did you decide to use in greater quantities?
• Which principle of combustion are you most interested in?
• what type of heat exchanger should be installed?

Fuel

Firewood	The most affordable fuel today are coal and firewood. It should be borne in mind that not all models can work with anthracite, it is better to use brown coal. When using firewood, you need to monitor their humidity - raw logs will not give the desired result. At the same time, well-dried firewood has a much higher efficiency than briquettes and pellets. Choose models that for 12 hours normal operation one bookmark is enough.
Pellets	A product of processing secondary raw materials that remain from agricultural waste and wood. When choosing equipment for burning pellets, you need to be sure that they can be purchased freely at any time and in the right quantity. The copper is convenient in operation, gives the chance to establish automatic giving of raw materials in a fire chamber. Now such equipment is more concentrated in the industrial sector.
Chips and sawdust	It is advisable to install equipment designed to work on wood chips, sawdust and briquettes near wood processing enterprises or on them. The instruction does not recommend using such boilers for the home as the main source of heat if there is no constant access to fuel.

Tip: for maximum savings it is better to select models that can operate efficiently on several types of fuel.

Combustion principle

An important aspect on which the comfort of using the equipment depends. Agree, not everyone will agree to throw fuel into the furnace after 4-6 hours, especially at night. In addition, in winter, someone is required to be constantly in the house who will monitor the boiler ().

You can choose the option with a large firebox or controlled combustion. Although in the first case the equipment will be many times cheaper, it still will not solve the problem, but will only postpone it in time.

Boilers are offered in two types:

1. Gas generating models - designed in such a way as to use the maximum possible amount of heat energy in the combustion process.

The design consists of two chambers:

• large - for loading and pre-burning fuel;
• the smaller one is for burning the rest.

As a result, the efficiency of the installation reaches 98%, which often plays a big role in the choice.

From the negative - the high price of gas-generating boilers long burning that can run on solid fuel. Besides, no special choice models. But, if you want to save on fuel as much as possible and get autonomy, we recommend that you take a closer look at them.

1. The boiler with the upper combustion principle can also be operated offline. He very often has a ceramic firebox and rather complex automation, which significantly increases the cost of the product.

From the pros:

• does not require constant care;
• high efficiency;
• automation allows you to leave the boiler for a long time unattended;
• can be connected to a heating system where forced circulation is not required;
• safe in operation;
• manufacturers give a long-term warranty on the equipment.

Of the minuses:

• metal parts inside the boiler are poorly cooled;
• loading can be done with your own hands only with dry firewood of a certain size;
• it is difficult to get rid of condensate, which may form due to water pressure or increased traction;
• it is difficult to kindle a firebox that is half loaded with fuel;
• Do not use sawdust or small chips.

Heat exchanger material

This is an important aspect, it must be taken into account when choosing a solid fuel boiler that can burn for a long time.

Usually steel, ceramics and cast iron are used.

1. Steel parts make it possible to reduce the cost of equipment. They normally tolerate temperature changes, but quickly rust. The service life of such a heat exchanger does not exceed 15 years.

Tip: This option is suitable for temporary heat needs.

1. The ceramic version is also made of steel, but ceramic coating is made on top.. Such parts are used in new generation boilers. In all respects, they are superior to any other options.

1. From cast iron, the heat exchanger is assembled by hand. The material is not afraid of rust, but it is quite expensive and subject to mechanical stress. Service life up to 30 years.

Conclusion

The options for long-burning equipment discussed above have both positive and negative technical specifications, therefore, when choosing for a home, this must be taken into account. We recommend giving preference to models for which there is an excess of fuel in this territory ().

The video in the article will help you find Additional information on this topic.

A solid fuel boiler is a common option for heating private houses and summer cottages.

Features of work

A double-circuit solid fuel long-burning device is a device that provides not only, but also hot water supply. Such units are easy to install and are the main competitor of gas boilers. Unlike gas boilers, solid fuel units are more independent of the fuel source.

One boiler circuit is directed for heating and heating a private house, and the other to serve hot water . The circuits maintain the same temperature due to built-in sensors that can detect the minimum drop in setpoints. Having received a signal from the sensor, the device burns the raw material, giving off heat to the water in the circuits. Often double-circuit boilers equipped with a container - a boiler, where hot water is accumulated, maintained at a given temperature and distributed throughout the house without requiring additional work devices. The heating circuit is cyclic, the waste liquid is returned back to the unit.

Fuel

When choosing a boiler for your home, you need to pay attention to the fuel. Various models of appliances, coal, pellets or several types of fuel at once. Coal and firewood are considered the cheapest options.

Sawdust, wood chips, briquettes are also inexpensive material, but they require a lot, so this type of fuel is convenient to use if there is a timber processing plant nearby.

is an environmentally friendly type of biofuel in the form of granules, which is obtained from peat, waste Agriculture and the timber industry. The granules consist of crushed material, dehydrated and pressed under pressure without adhesives. Pellet models of boilers have a special container into which pellets are poured, and they are consumed automatically, so there is no need to monitor the fuel supply. Depending on the type of equipment, you can fill the container with coal, sawdust, wood chips.

Read also: Solid fuel hot water boiler

Types of long-burning boilers

Depending on the method of fuel combustion, dual-circuit devices for the home are:

1. Ordinary equipped with a volumetric firebox.
2. Long burning, in which the fuel burns out almost completely due to the pyrolysis process (fuel and combustion gases are burned separately).

Double-circuit pyrolysis gas boilers have two types of construction:

1. The gas-generating type of devices has two combustion chambers, fuel is placed in the first, and the gases resulting from combustion are burned in the second. This version of the device has a high efficiency - about 98%. The combustible raw material burns out very efficiently (there is almost no ash left) and releases a large amount of heat. This unit works in standalone mode.
2. Top burning. The design has a cylindrical shape, water circulates between the two layers of the boiler body, heating up from contact with the wall of the firebox. Pipes hot water goes into the heating system and comes back. At of this type appliances have a large amount of space inside, into which a large amount of fuel (usually wood-burning) is loaded from above. The combustion process takes place in the upper gas part of the fuel layer, where oxygen is supplied.

Advantages and disadvantages of long burning boilers

Advantages:

1. Ease of installation and connection to the heating and hot water supply system.
2. Ease of use, many models are equipped with electronic systems management of work, in which the necessary mechanisms for automating processes are already installed.
3. The low price of the fuel used and its variety.
4. Economical consumption of resources and high efficiency.
5. Environmental friendliness. combustible material burns almost without residue, the emitted flue gases have a minimum content of impurities.
6. Many manufacturers guarantee a long service life - more than 25 years.
7. Does not require special permissions for installation in a private home.

Sometimes heating equipment requires not only heat, but also hot water. And if the house does not have gas, natural or liquefied, a double-circuit solid fuel boiler should be adapted for this purpose. It is highly desirable that this be a model of long burning, which does not require too frequent fueling. There are a huge number of such boilers on sale, so you should learn how to choose them. That is why we have prepared this review.

Principle of operation

Double-circuit boilers are universal devices. They can heat homes and provide prepared hot water. heated to a certain temperature. Their device is quite complex, there are many additional nodes and modules, because the finished design should be as compact and functional as possible. This is what distinguishes double-circuit boilers, both gas and solid fuel.

The hardest set up gas equipment, in which, in addition to the burner and heat exchanger, there are gas units, security systems, piping, various sensors and fans. All this makes the equipment difficult to maintain and repair. As for double-circuit solid fuel boilers, they are much simpler. In them we will find:

The device of a solid fuel boiler with two circuits: heating and hot water.

• Burner - classic or pyrolysis;
• Dual heat exchanger;
• Additional branch pipes for water supply and intake.

A wood or wood gas burner generates heat, which heats the coolant circulating through the heat exchanger. In this heat exchanger, pipes are laid that are responsible for heating the incoming water from the water supply. Since direct contact with hot metal is excluded here, this scheme allows you to get rid of scale- the temperature for its formation is insufficient here.

Some boilers are arranged differently - the flame passes in the middle of a cylindrical heat exchanger, which first heats the heating circuit. The hot water circuit in such units is located on top of the heating circuit. This approach ensures that there is no overheating of water in the DHW preparation system.

Thus, no three-way valves and there are no other complex nodes here, which is already a definite plus. As soon as you open the faucet, hot water immediately begins to flow from it. Moreover, it is too hot, since it is very problematic to adjust the temperature in the DHW circuit in a double-circuit solid fuel boiler - especially if it does not have a combustion control system.

It is possible to count on a more or less stable water temperature in the hot water supply circuit only in pellet models. But gas and liquid models do it best.

Solid fuel double-circuit boilers of long burning are equipped with capacious combustion chambers, which can accommodate a large amount of solid fuel. Some models can work up to 12 hours from one bookmark. The record holders are pellet devices operating on compressed wood pellets - they can be equipped with extremely capacious bunkers that provide continuous burning for 7-10 days.

How to choose

The purchase can be made in heating engineering stores or in specialized stores - in the latter case, the chances of buying a good double-circuit boiler with suitable characteristics increase significantly.

Fuel types

When choosing a model by type of fuel, think about how you will store this fuel. After all, everyone separate view requires certain storage conditions.

Double-circuit solid fuel boilers for heating a private house can run on a variety of fuels. The most popular type of fuel is ordinary firewood. In the southern regions, 13-14 cubic meters of firewood from oak, beech and hornbeam cost about 14-17 thousand rubles, but you can find cheaper. If possible, firewood can be bought cheaply from a local forester - this is often used by residents of small towns, villages and villages.

Firewood has good heat dissipation, and if it is obtained in the nearest forest, then it will also be free - the main thing is to manage to make a normal supply for the whole winter and allocate space for their storage. And it becomes main problem, because the wood is quite voluminous. And it still needs to be dried to improve combustion. For example, pyrolysis double-circuit solid fuel boilers need fuel with a humidity level of not more than 20-25%.

Pellets for pellet boilers are quite an interesting and cheap type of fuel. One ton of granules can be purchased for about 7,000 rubles. They are easy to store in bins or in the nearest corner. Their advantages:

• Convenience of bookmarking - loose pellets can be poured into the chamber or into the bunker directly from the bag or with a spatula;
• Good heat dissipation - 5 kW per 1 kg of pellets;
• Low ash formation - true for special low ash pellets.

Thus, pellets can easily replace firewood.

Stone and brown coal can be used in almost any solid fuel boilers. But it is still preferable to use coal(black), since it burns for a long time and with a large release of heat - brown coal is demanding on storage conditions and burns too quickly.

In terms of ease of use, pellets win - they contain a large amount of thermal energy, they are easy to store and very convenient to fall asleep.

Heat exchanger material

Choose a unit with a cast iron heat exchanger, it will last you much longer.

We must say right away that preference should be given to models with cast-iron heat exchangers. Cast iron is ideal material for such purposes - it easily withstands temperature overloads, is resistant to corrosion, and is characterized by a long service life. And it also heats up quickly and cools down slowly, continuing to give off the accumulated heat to heating system even in the absence of a flame.

The serious disadvantages of cast iron include its brittleness. It does not withstand shock, so care must be taken when installing equipment. The brittleness of this alloy increases as it is heated.

Steel heat exchangers are good because they easily withstand water hammer, and double-circuit solid fuel boilers built on their basis are cheap. Among the shortcomings - the tendency to form corrosion and scale. But such boilers are easier to install, as they are very light - cast iron is a very heavy alloy.

Combustion principle

Double-circuit solid fuel boilers for long burning are divided into three categories:

• Pellet, with automatic fuel supply;
• Classic, with a large loading chamber;
• Pyrolysis, with the combustion of wood (pyrolysis) gas.

If you do not have time to frequently add fuel, take a closer look at pellet boilers with a large bunker.

Pellet models can burn for a very long time - some models are endowed with giant bunkers that can hold up to several tens or even hundreds of kilograms of granular fuel. Pellets are fed into the furnace automatically. Some units even know how to regulate combustion and are even equipped with automatic ignition systems.

Classic solid fuel boilers burn wood and coal traditional way. The frequency of bookmarking is 1 time in 3-5 hours. On sale there are modifications of long burning, including double-circuit ones, with volumetric combustion chambers. They contain a large amount of fuel that can burn up to 8-12 hours (burning time for some models is up to 24 hours).

Pyrolysis units are arranged according to the principle of a gas generator. They burn wood in the primary chamber, with a small amount oxygen. The resulting wood gas is sent to the afterburner, where it burns with the formation of a large amount of heat. Part of the thermal energy is sent to the first chamber, contributing to more intensive gas generation. Such boilers can burn from one tab for a very long time.

Advantages and disadvantages of such units

The price of a double-circuit solid fuel boiler for long burning can be very high. Especially if it is a pyrolysis or pellet model. The minimum prices start at 17 thousand rubles for a classic 10 kW model. For a 20 kW pyrolysis-type unit that can work on any type of solid fuel, you will have to pay from 55 thousand rubles. Thus, the cost consists of power and functionality.

As you can see, there is nothing complicated in the device of a classic solid fuel, which is why it costs less than pyrolysis or pellet models.

• The minimum number of approaches for laying fuel - in some models it needs to be loaded every 7-10 days;
• Possibility of heating houses without electrification and gasification- for this, non-volatile models were created;
• Work on inexpensive solid fuel - reduces the cost of operating the heating system;
• Profitability in comparison with electric heating equipment - costs are 3-4 times lower.

A modern residential building is a whole complex complex, the task of which is to provide the domestic needs of its residents and inhabitants. The comfort of the inhabitants and the level of livability depend on the level of technical equipment of a residential building. One of the leading roles in this regard is played by the heating system, which should not only provide heating interior spaces during the cold season, but also guarantee the operation of the hot water system. For country house, in the absence of central gas supply, issues with heating and DHW operation can solve a double-circuit solid fuel boiler.

Let's take a closer look at what this technique is.

The feasibility of installing a solid fuel boiler in a residential building

This type of heating equipment is very convenient for those residential buildings where there is no centralized gas supply system. Variant with electric heating recognized today as ineffective due to the high cost of electricity, so it is often used only as an aid. Solid fuel units, on the contrary, are able to operate on fuel, which is sometimes at our fingertips. It can be firewood, woodworking waste, coal. Solid fuel, available in sufficient quantities, will not only provide a working boiler with a constant load, but will also bring significant savings to the home budget.

Single-circuit and double-circuit solid fuel boilers presented for sale today are devices with high technological characteristics. This technique has now been brought to perfection by manufacturing companies. A number of design innovations have made it possible to significantly increase the efficiency of boilers, have changed in better side operating conditions for solid fuel heaters. The double-circuit solid fuel boiler copes well with heating a residential building during the heating season, at the same time providing residents with household needs hot water.

Thanks to technological progress modern technologies do not stand still. Demand creates supply. Just yesterday, unpopular heating boilers wood-fired or coal-fired are becoming popular again. Extra-urban intensity housing construction has become one of the reasons that solid fuel heaters are back in price. The people massively install heating units for the home heating system, using organic and fossil raw materials as fuel.

Double-circuit long burning - optimal solution for heating a private house. A powerful unit that provides all living spaces with sufficient heat energy, is at the same time a very economical and easy-to-maintain heating device. Moreover, such heating devices require minimal human intervention.

The combustion of the fuel placed in the boiler takes a long time, freeing the residents of the house from the need to constantly throw up fuel material. Exactly long process combustion and makes such equipment as attractive to the consumer as possible. Not everyone wants to be a stoker and stand near the firebox on cold winter nights, throwing firewood or coal in the boiler. The very principle of operation, which is the basis of the operation of the devices, gave them the name - long-burning boilers, solid fuel.

The principle of operation of heating equipment of this type

AT various materials Much has already been said about what the principle of operation of heating solid fuel technology for long-term combustion is based on. The achieved effect is due to a fundamentally different way of fuel combustion in the combustion chamber. Due to the multi-stage combustion process, complete burnout of the fuel mass loaded into the boiler is ensured. At the same time, it stands out in in large numbers wood gas, which performs the main work of heating the coolant.

For reference: units operate on the basis of pyrolysis, the process of generating volatile combustible compounds obtained from wood as a result of exothermic reactions. In the process of fuel smoldering, wood (pyrolysis) gas is formed, which, when interacting with hot air, ignites. This technique is also called gas generators.

The principle of operation of boiler equipment is relatively clear, let's figure out how a double-circuit autonomous solid fuel boiler works at home. Let's consider its main functions. The presence of two circuits in the system provides heating in the house and hot water supply. In the primary circuit, boiler water circulates, which diverges throughout the pipeline, supplying heat to the heating radiators. The second circuit is designed to remove the waste coolant back to the boiler for subsequent heating. Sensors installed on both circuits - determinants, sensitively react to the slightest change in the set temperature of the coolant, giving signals to the control panel. Accordingly, automation activates mechanical device, which regulates the air flow in the combustion chamber of the heating device.

Design features of the two-circuit model

Having a double load, heating and hot water supply, solid fuel units of this type are equipped with additional devices. There are two types of such devices:

• storage boiler (heat accumulator);
• additional coil.

The difference in both devices lies in the principle of heating water. In the first case, it is storage capacity, which accumulates hot water and from there hot water diverges to the connection points. In the second case, a cast-iron hot water coil is installed inside the boiler. Heating of water occurs in the mode of constant circulation of hot water. Both options are equally successful and effective, providing a stable supply of residents of the house. hot water. Together with the boiler, the heater will not take up much space, however, the presence of two circuits requires certain rules to be observed during the operation of these devices.

Wiring diagram double-circuit boiler on solid fuel it looks like this. By their design, all heating devices of this type are almost the same, with the exception of some differences.

The only condition: when connected to a heat storage system, it is necessary to have strict control over the use of hot water. Installing more than two hot water connection points in the house can adversely affect performance DHW systems. The flow-through method of heating hot water is more dynamic in terms of operation, however, at the same time, the boiler power should be much higher.

Long-burning double-circuit boilers have a standard design, which is almost the same for many models, with the exception of some differences.

The figure shows standard design solid fuel unit operating on the heating system and hot water supply.

Solid fuel boilers with two circuits consist of:

• main, heat-insulated body;
• combustion chamber (furnace);
• podzol chamber (ashpit);
• the main heat exchanger of the heating system;
• additional heat exchanger (coil) for hot water supply;
• automation and control devices;
• damper and chimney.

In some cases, additional circulation pump, providing forced circulation of the coolant in the main heating circuit. For better job heater long burning, fans are used that force air into the combustion chamber and contribute to a better outflow of combustion products through the chimney.

Some nuances in the operation of double-circuit solid fuel boilers

An obvious plus that solid fuel boilers of this type have is long work with a single load of fuel.

For example: 30-50 kg. firewood laid in the firebox can burn up to 12 hours. During this time, the unit is able to provide the maximum possible heat to heat the living quarters in the house and provide normal domestic hot water needs. Reducing the consumption of hot water will increase the duration of fuel burning up to 24 hours. The boiler will operate in nominal mode, maintaining a certain temperature in the house.

It should be remembered! A solid fuel unit extinguished for a long period during the winter can cause the entire heating system to freeze. To avoid such troubles, antifreeze can be used for the main heating circuit.

It is also important that long-burning double-circuit boilers do not allow high accuracy to regulate the temperature of the coolant in the heating system. The reason for the difficulty lies in the inertia of the operating heating equipment. The built-in boiler will solve this problem by creating optimal conditions to control the heating unit.

In conclusion, a few words should be said about where and how it is better to install this heating equipment in the house. Long-burning solid fuel boilers are produced only in a floor version. Due to the bulkiness of the design itself and the need to install a storage tank, the best option will be equipped with a special boiler room.

A modern solid fuel double-circuit boiler has a design that provides fast heating of the coolant for the heating system and water for hot water supply. In the summer season, boilers with two circuits are able to work exclusively for heating hot water.

For convenience, an electric heater is built into the body, which performs the function backup source heat.

The design and principle of operation of a double-circuit TT boiler

All household double-circuit solid fuel heating boilers have a similar device. Manufacturers change the principle of operation, modify the combustion chamber, increasing the volume and configuration, but the coolant is heated according to the same scheme:

• The heating circuit consists of two empty containers inserted one into the other.
• The heat carrier of the heating system circulates through the internal cavity, and water for hot water supply circulates through the external tank.
• Contour surrounds smoke channel through which combustion products are discharged. The heating temperature is sufficient to ensure uniform heating of the coolant and water.

A modern double-circuit solid fuel boiler, in its design, uses a broken chimney channel, surrounded by a coolant along its entire length. The heated smoke is not immediately discharged into the chimney, as happens in classic boilers, but first circulates inside the boiler, giving off heat.

As standard, the device of a 2-circuit boiler includes the following components:

1. Traction regulator.
2. Air preheating chamber.
3. A damper that regulates the operating mode.
4. Combustion chamber and afterburner chamber (in some models).
5. Air distributor.
6. Grids.
7. Cast iron or steel heat exchanger.
8. Fuel conveyor (models with automatic loading).

In modern models of heating equipment, the main emphasis is on automating the combustion process and increasing the duration of work on one fuel tab. An enlarged combustion chamber is provided, afterburning of exhaust gases and sensitive automation are used.

Dual and Single Circuit - What's the difference?

To explain simply, without complex technical terms, the difference between a single-circuit and a double-circuit boiler is that the former work exclusively for space heating, the latter additionally heat water for hot water supply. A single-circuit unit, if necessary, can also be converted for hot water supply by connecting a boiler indirect heating but this will incur additional costs.

Solid fuel boilers with 2 circuits have a built-in tank with two cavities through which the coolant and water circulate for domestic needs. During operation, the liquid heats up and enters the heating or hot water supply system.

Old models of double-circuit solid fuel heating boilers could not work separately for hot water and heating systems. AT modern designs, the "summer" mode is provided, which allows providing hot water without heating the building.

How to heat hot water in summer

Dual circuit solid fuel boilers heating and domestic hot water, the latest models, are able to work exclusively for heating water in the summer. Providing hot water is carried out in the following ways:

Some consumers, in addition to purchasing a double-circuit boiler, additionally, to get hot water in the summer, buy and install an indirect heating boiler.

The advantage of this solution is that in the storage tank, the liquid retains its temperature for several days. Therefore, there is no need to fire single or double-circuit solid fuel heating boilers every time hot water is needed. One kindling is enough to provide the need for hot water for several days.

How to choose a solid fuel boiler with two circuits

In spite of wide range of manufactured products, choosing a solid fuel boiler with a DHW circuit on your own is not as difficult as it might seem at first glance. It suffices to consider a few important features related to the configuration and the principle of operation:

• Type of heat exchanger - the consumer is offered a steel and cast iron boiler. The first option is cheaper, approximately 2-3 times cheaper, has less weight and is resistant to temperature changes in the supply and return of the coolant.
  The disadvantage is a relatively short service life, about 10-15 years. The minimum term for a cast iron boiler is 35 years. Models made of cast iron are distinguished by better thermal performance compared to steel counterparts.
• The presence of a built-in heating element - the heating element performs the function of a backup heat source. After the fuel burns out, the coolant gradually cools down. A temperature sensor is installed on the return line, which fixes the changes and is connected to the heating element.
  After the coolant cools below the set parameters, the electric heater automatically turns on, maintaining the required temperature of the liquid. After the boiler is reheated, the heating element will automatically turn off.

In addition to the specified technical parameters, when choosing a boiler, a power calculation is made, a model is selected according to the manufacturer and cost.

We calculate the required power

The calculation of classic single-circuit boilers is carried out according to the formula 1 kW = 10 m². Calculations help to find an approximate power value and are suitable for rooms with a ceiling height of not more than 2.7 m. A solid fuel boiler with a separate hot water circuit, calculated taking into account the cost of heating water.

For a building with a heated area of ​​100 m², the calculation is carried out as follows:

• Exclusively for heating, a boiler with a capacity of 10 kW is required.
• For DHW heating, additional power is needed, equal to 30-40% of the heating boiler capacity.
• A building of 100 m² will require a double-circuit boiler with a capacity of 13-14 kW. Rounding in the parameters is performed up. If the selected manufacturer does not have 14 kW boilers, purchase standard 15 kW equipment.
• The built-in heating element is not used as the main source of heat and is intended only for periodic operation.

Accurate calculations, taking into account possible heat losses, are performed using special calculators.

Brands of 2-circuit solid fuel boilers

Double-circuit boilers are made by several manufacturers. Several models of Russian, Ukrainian and European equipment are especially popular with the domestic buyer. Among them:

• Conord KS-TV- a model offered by the manufacturer in the power range from 16 to 50 kW. The design provides thermal insulation of the body with a thickness of 40 mm. Even with intensive use, the surface of the boiler remains cold. The efficiency of solid fuel combustion is 90%. Can be converted to gas.
• Karakan TPEV- a universal model designed to use any type of solid fuel. The design provides for an open combustion chamber, a built-in heating element. Power 10 and 15 kW. The boiler is completely non-volatile with manual fuel loading.
• Mimax KSTGV- a boiler that runs on solid fuels and gas. Equipped with automation. The model is standardly manufactured with a steel combustion chamber. Productivity from 16 to 40 kW. Efficiency 89%.
• Hephaestus KSTGV- boilers, at the request of the customer, are equipped with a DHW circuit or a built-in boiler. Possibility of conversion to natural or liquefied gas. Power sizes available are 12.5; 20; 25 and 40 kW.
• CTC Trio- fully automated universal boilers designed to run on gas, electricity and solid fuels. Manufactured by Enertech Group, based in Sweden. The concern's products are included in the hundred of the most popular heating equipment manufactured in the EU. The intensity of the hot water supply is 730 l / h, the efficiency of the device is 96%. The design includes a block heating elements, 3 pieces, 4 kW each.
• Teplopribor KS-T- Belarusian model of a solid fuel boiler with two water circuits, commonly called "Birch". The combustion chamber is designed for any type of solid fuel, briquettes and wood waste. Adjustment is carried out manually.
• KAZ Kordi AOTV- the manufacturer produces a line of household solid fuel units with standard sizes in terms of performance from 10 to 100 kW. Models are equipped automatic regulator traction, pumping equipment and blower fans.
• Buran- a universal boiler that uses the principle of upper combustion and is equipped with a vertical combustion chamber. Its design resembles the Latvian Stropuva. Power from 12 to 40 kW. The boiler works for 30 hours on one tab of fuel.
• Atem Zhytomyr- It has classic design. Non-volatile. The main advantage is the possibility of installation in a heating system with a pressure of up to 6 bar. The presence or connection of a heating element is not provided.

When choosing suitable model, take into account real feedback from customers who have been using a boiler of a domestic or foreign manufacturer for some time.

Cost tt boilers with 2 circuits

There is no strict cost limit for double-circuit solid fuel boilers for heating and hot water supply. The price is affected by the ruble exchange rate, the brand of the manufacturer, the type of combustion used and the automation of work. The cost increases the presence of a built-in storage boiler, cast iron heat exchanger etc.

A 30 kW Conord KS-TV boiler will cost 30 thousand rubles, the Karakan model will cost approximately the same cost. CTC Trio equipped with the latest developments and operating on almost any type of solid fuel and gas, will cost approximately 450-500 thousand rubles. High price due to cost-effectiveness, a record efficiency of 96%, several combustion chambers and almost complete automation of the combustion process.

Advantages and disadvantages of a double-circuit TT boiler

The main common disadvantage of double-circuit solid fuel boilers is the dependence of the operation of the equipment on a person. AT recent times many completely autonomous stations with mechanized fuel supply appeared. But budget models still depend on the individual.

Until recently, another disadvantage that boiler owners often encountered was the frequent overheating of the coolant. Modern models connect to a security group that prevents emergency and when water boils, relieving pressure from the system. Additionally, valves are installed that mix cold water to the coolant and constantly leveling the temperature of its heating.

As advantages, they distinguish ease of installation, reliability and no need for registration. For correct connection double-circuit TT boiler, it is enough to follow the manufacturer's recommendations and the requirements of PPB and SP. Each model is accompanied by a wiring diagram that takes into account various nuances and configuration features.

Modern boilers operate up to several days from one fuel load. Mechanized stations with automatic fuel supply, able to function without stopping during the entire heating season providing heat and hot water.

Universal models, in addition to solid fuels, use natural and liquefied gas, as well as electricity. All these points explain why boilers with two circuits are in demand among domestic consumers.