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3 popular models of solid fuel boilers

When choosing a solid fuel boiler, study its functionality. Now the owners of private houses are preoccupied with finding a universal unit. Manufacturers are expanding the capabilities of products: they offer models that work on different types fuel, automate the process as much as possible. Consider 3 models of solid fuel boilers within the parameters described above.

1.Candle 18 firm AREMIKAS (Aremikas), Lithuania
Fuel: firewood.
Type of: long burning.
Material: steel.
Power: 18 kW, which is enough to heat a house with an area of ​​50 to 120 m2.
Chimney diameter: 160 mm, thrust - 15 Pa.

The shape is elongated, cylindrical, the minimum burning time of one bookmark of firewood is 7 hours, the maximum is 34 hours. Compact, non-volatile, economical.

Testimonial: “Empirically determined optimal size logs 10-20 cm, so that they fit comfortably in one hand. The better you put the wood, the better it will burn. " Ivan

2. Zota Mix 40 manufacturer Russia
Fuel: firewood, diesel, gas, coal, fractional coal.
Type of: classic, combined.
Material: steel.
Power: maximum 40 kW.
Chimney height: 8 m.

The boiler is equipped with an electronic control module. The water jacket is located along the contour of the combustion chamber. The efficiency of the combustion process is ensured by a mechanical traction regulator, a thermomanometer for controlling the temperature and pressure of the coolant.

Reviews: "I also have Zota, there are no problems with the equipment, but I had to contact the manufacturing plant ... If there are problems - call or write ... There are offices in many cities ... intelligent, responsive people" Peter.

3. Alpine Air Solidplus-4, country of origin Turkey
Type of fuel: coal, firewood.
Material: cast iron.
Combustion chamber type: open.
Power: 25.5 kW.
Efficiency: 70%.

The boiler is finished with a special corrosion-resistant paint on top. The manufacturer gives a guarantee for 3 years of trouble-free service. It is non-volatile, which allows it to work effectively at low temperatures.

What consumers say: “I am the owner of a small country house an area of ​​90 squares. I got Alpina a year ago. It works like a clock, without failures, both under heavy loads and not so much. I chose a cast iron boiler because it keeps heat for a long time. I am satisfied with the purchase, the optimal ratio of price and quality. " Alex.

You should buy equipment for heating after a thorough study of the technical characteristics of the device, reviews on forums from real consumers, and an analysis of your own needs. Only a properly selected unit will help create a comfortable atmosphere at home and fill it with cozy warmth.

Solid fuel heating boilers in the past were somewhat primitive and inconvenient, but today everything has changed. Manufacturers offer consumers advanced equipment that harmoniously combines high efficiency and ease of use. Such units are used in areas where there is no gas main, and there are also power outages.

The device and the principle of operation of the equipment

Devices of this type are structures consisting of several basic elements:

• heat exchanger - this unit transfers energy from heated water;
• combustion chamber - it is made of high-alloy steel, high-quality cast iron;

Heating schemes can include the simplest single-circuit devices and powerful units

• thermostat;
• ash pan - combustion products accumulate here;
• grate - firewood, coal, pellets are placed on it;
• cleaning hatch;
• dampers that regulate the operation of the chimney.

The principle of operation of the units boils down to the fact that the fuel burns in a volumetric furnace, the water is heated and supplied to the system. Ash and slag enter a special bunker and are periodically removed from there manually.

During the development of equipment, original technical and ergonomic developments are used

Companies producing modernized solid fuel heating boilers are trying in every possible way to simplify the operation process. Modern devices are equipped with draft regulators, thermostatic valves. Draft regulators affect the combustion rate by opening and closing the throttle. As for thermostatic valves, they consist of cooling circuits, thermostats and are designed to drain water in case of overheating.

This is important to know: in pyrolysis boilers, a different principle is applied: in one chamber, firewood smolders with limited access to air flows, and the resulting gas is burned in the second.

Connection diagram for a solid fuel heating boiler

The duration of the uninterrupted operation of the devices depends on how correctly the design and installation was carried out. Solid fuel boilers for hot water heating are devices that heat the heat carrier. But do not forget that there are additional elements. The standard connection diagram looks like this:

• unit;
• circulation pump- driving force moving water;
• expansion tank - such an element compensates for the temperature expansion of the water;
• buffer tank - a vertical tank, the main purpose of which is to accumulate excess heat. A heating system with a solid fuel boiler using a buffer is an excellent option, because the number of loads is reduced, the temperature regime of the equipment is improved, and the consumer is provided hot water;
• safety group - three devices combined on one console: a pressure gauge, a Mayevsky cock, a safety valve. It is designed to protect the system from air and overpressure;

The safety group is mounted vertically above the boiler

• emergency circuit - it ensures the normal operation of the system in non-standard situations.

The heating scheme with a solid fuel boiler can be different, because there are many nuances. For example, if the system is open, the tank is installed in attic, on the staircase. In other cases, membrane tanks are used, which are strong vessels separated by a partition made of environmentally friendly rubber.

The piping of a solid fuel heating boiler solves several important problems. These include maintaining the temperature of the coolant, creating optimal conditions for the operation of equipment, one hundred percent protection against overheating, and air removal. The heating system with a solid fuel boiler is quite complex, therefore, intelligent specialists should carry out the design and installation.

How devices are classified

There is a wide range of equipment on the market that differs not only in size and appearance, but also by many other indicators. We will talk about them further.

The method of fuel combustion is a fundamental parameter that has a priority value. According to this indicator, devices are divided into:

1. Classic - in them the usual process of combustion of firewood, coal, with the release of fertile heat, takes place.
2. Pyrolysis - at high temperatures and in the absence of oxygen, flammable gas is released. Such boilers are equipped with a blower fan and provide almost complete combustion of pellets and firewood.
3. With natural draft - the combustion process of pellets, peat briquettes in such models is controlled by a thermostatic regulator.
4. With additional draft - such units are equipped with fans, with the help of which air is supplied to the firebox.

This is important to know: pyrolysis equipment has significant advantages, but it costs more. In addition, the devices are more demanding on the moisture content of the wood.

Fuel type - depending on this indicator, boilers are coal, pellet, wood-fired. In the first, briquettes, brown and black coal, anthracite are used, in the second - cylindrical granules standard sizes, thirdly, dry firewood. There are also universal solid fuel boilers for hot water heating.

Heat exchanger material - not less important indicator, on which a lot depends. On this basis, there is such a classification:

• steel units are unpretentious equipment in operation that does not fail when exposed to high temperatures. Thanks to the introduction of modern design solutions, the devices have good efficiency and serve for 20-25 years;

Steel solid fuel boilers "Viessmann Vitoligno 100-S" operate on wood logs and have an electronic control system

• cast iron solid fuel heating boilers - they are reliable, durable and resistant to corrosion. But there is one drawback: cast iron heat exchangers can collapse with sudden temperature changes.

What is the advantage of modern solid fuel boilers

For homes without gas, solid fuel boilers are ideal. This statement can be argued by the fact that the equipment has a lot of advantages:

• profitability - the cost of fuel (peat briquettes, granular waste from the woodworking industry) is acceptable. Therefore, throughout the season, a comfortable temperature is maintained in the house, and the budget does not suffer much;

Solid fuel boilers – perfect solution because they can function on coal, straw, wood - ideal solution because they can function on coal, straw, wood

• high efficiency - rooms of any size are provided with heat;
• safety - this moment is carefully thought out, because the devices are equipped with monitoring systems;
• long service life - this indicator is 20-30 years and is directly related to the correct installation, regularity of maintenance;
• autonomy - heating country house a solid fuel boiler does not depend on third-party factors: the presence of a gas pipeline, electrical networks;
• ease of placement - to equip a functional system, you need to install a heating unit, connect pipes, an expansion tank, radiators to it;
• ease of use - modern solid fuel heating boilers for long burning are fully automated, so human participation is minimized. Naturally, in this case, one should not forget about the periodic cleaning of the ash pan from waste products, since this process is carried out in manual mode.

What to look for when choosing a heating boiler

The purchase of heating equipment is associated with a number of tasks that must be solved in advance. Therefore, before making a purchase, you need to understand the following points:

1. Power is the primary parameter by which units are selected. The calculation of the power of a solid fuel heating boiler is carried out according to a simple formula: the area of ​​the house is divided by 10. Why is it so? Because 1 kW of power is required for high-quality heating of ten square meters housing.
2. Heat exchanger type.
3. Dependence external factors- solid fuel electric heating boilers with a forced-draft fan do not function without electrical energy. If the circulation is natural, there is no problem.
4. Duration of work from one download.

Polish solid fuel boilers "PEREKO" are equipped with a blower fan, which increases the time of continuous fuel combustion

Heating a wooden house with a solid fuel boiler is the right decision if the home is cut off from the benefits of civilization. But you need to understand that the correct operation of the system is possible when the design and installation of all units and components is carried out by the master. Competent specialists know the intricacies of their work and guarantee the uninterrupted operation of the equipment for many years.

Video: heating a house with a solid fuel boiler

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For a long time, in every house located in the Russian open spaces, the heating stove has been the most important place. Thanks to the stove, the house was warm in winter. In addition, food was cooked on them, and some designs with a stove bench even made it possible to sleep. In many rural huts, stoves have been preserved to this day. Over time, they have undergone significant changes and now, to provide heating, owners use heating boilers solid fuel, electricity or gas.

Deservedly gas heating is considered the most optimal solution to the problem of heat supply, but, unfortunately, the highways are not laid in all settlements. Electric heating of a house is an expensive option, and an unstable supply of electricity can lead to a shutdown or breakdown of equipment. Therefore, property owners, especially in rural areas, prefer to install solid fuel heat generators.

Classification of solid fuel boilers

• cast iron;
• steel.

The operation of all models of devices operating on solid fuels depends on the presence of water in heating structure... If the amount of coolant in the system reaches a critical level, overheating and deformation of individual elements is possible. Steel units are more resistant to temperature fluctuations, and cast iron products are more resistant to corrosive processes.

Thus, cast iron and steel heat generators differ not only in weight, material of manufacture, but also in other characteristics, including structural differences. So the cooling coil in steel solid fuel boilers is located inside them. When the coolant heats up to a critical temperature, you can open the thermostatic valve, after which it will begin to flow cold water and thus, it will turn out to lower the temperature.

In cast iron boilers, such as in the photo, similar elements are located on the feed. It is possible to lower the temperature in them only by partially draining the hot water and adding a cold heat carrier. In the production of a cast iron product, its sections are assembled into a single device using steel pins. As for the steel unit, its parts are connected by welding. The strength of the seams depends on its quality.

Loading of wood, coal, pellets into solid fuel boilers is done manually by opening / closing the loading door. Since its inner part is in contact with fire and heats up very much, a person can get a serious burn in contact with it. To prevent this from happening, cast iron units have a door with a special protective layer. For steel appliances, the door is equipped with a water-cooling circuit along the contour.

To clear ash and ash from a cast-iron boiler, you will need a poker. Steel heat generators are equipped with mechanically controlled swivel grates - as a result, to clean the stove you do not need to open the door to the firebox.

• single-circuit;
• double-circuit.

In this article we will introduce the reader to the world of modern solid fuel heating systems. What are solid fuel water boilers?

Is the use of this particular type of fuel economically justified? Does it have serious flaws? We will try to answer all these questions.

The canonical scheme of the device, including hob... As we will see later, this is far from the best design.

Boiler classification

It is clear that all solid fuel boilers for hot water heating are characterized by a number of common features. By definition, they use the heat of combustion of wood (as an option - the products of its processing), peat or coal. In addition, the temperature of the coolant leaving the boiler does not exceed 100 degrees.

How do these devices differ from each other?

Material

We are talking about the material of both the boiler itself and its heat exchanger - the unit through which the coolant contacts the firebox.

There are two main options:

• Steel boilers are, on average, somewhat cheaper and have much less weight. However, they are also characterized by a shorter service life. Steel is a metal that is afraid of corrosion; flames and highly aggressive condensate rapidly destroy it.

However: Russian-made high-quality solid fuel heating boilers, like imported ones, are made of heat-resistant grades of corrosion-resistant steels. In addition, the firebox is often additionally protected by a refractory brick lining.

• Cast iron is a material that is much less afraid of corrosion. That is why it is used for the manufacture of grates and doors in ovens; that is why cast iron boilers, on average, are much more durable than steel ones.

The price of a longer service life is a large mass of products. As a rule, even boilers of modest (up to 16 KW) thermal power require mandatory installation exclusively on a capital foundation.

Fuel

The most versatile are solid water boilers capable of operating on several types of fuel. Without any adaptation, you can, after cleaning the ash pan, throw coal after firewood or peat briquettes after pellets into the furnace.

However, devices oriented to only one type of fuel, as a rule, have a higher efficiency. Their design is optimized for combustion with a well-defined flame temperature and fuel humidity.

In addition to single-furnace boilers, boilers with two separate fireboxes and two heat exchangers are produced. They allow you to burn different types of fuel, which require a different design of the combustion zone. In fact, a burner for a solarium will quickly deteriorate if it is among the burning wood.

Efficiency

Efficiency at different types boilers are very different. The factors determining this parameter are the temperature of the combustion products at the outlet and the amount solid waste... In both cases, less is better.

The minimum efficiency, often not even reaching 50%, is for the simplest hand-made devices. Yes, a box made of steel sheet with two doors and a coil inside will cost quite inexpensively; however, you will have to burn a LOT of wood to get the heat you need.

Factory production of solid fuel boilers relies on accurate calculation of their shape and size of the heat exchanger. Even in younger models, the temperature of the combustion products usually does not exceed 120 degrees. In addition to the fact that more heat is given to the coolant, this also means greater fire safety.

The so-called pyrolysis, or gas-generating boilers stand apart. How do they work?

• The device contains two furnaces with heat exchangers in each of them. They communicate with each other and are placed one above the other.
• In the upper firebox, under conditions of a lack of oxygen and high temperatures, the wood smolders slowly, gradually decaying into ash. There are no large coals left during normal operation of the boiler.

However, due to the lack of an oxidizing agent, the fuel does not burn completely: it emits a large amount of pyrolysis gas, consisting of CO (carbon monoxide) and volatile hydrocarbons.

• This gas is forcibly fed into the lower furnace, where it burns out completely after oxygen-rich air is added to it.

Solid fuel gas-fired hot water boilers have a very high efficiency, reaching y best devices 95 percent. However, they are 1.5-2 times more expensive than traditional designs and require low-moisture fuels. In addition, the younger models work ONLY on wood.

Autonomy

Devices of traditional design require the constant presence of a person - the furnace must be loaded every 2-4 hours. The profession of a fireman was not born out of nowhere. This property is the main disadvantage of solid fuels; This is partly why if main gas is available, a rare owner of a cottage will think about wood or coal.

The pyrolysis boiler, however, by virtue of the principle of its operation, makes the fuel not burn, but smolder. The boiler can operate on one load for up to 12 hours.

Relatively recently, the Lithuanian company Stropuva has established an in-line production of the so-called overhead combustion boilers. They provide heating with even greater autonomy: for certification in 2003, the serial model, after loading 50 kilograms of fuel, gave about 6 kW of thermal power for about one and a half days.

How is such a long run time achieved?

• The volume of the furnace has been increased and can hold several tens or even hundreds of kilograms of fuel.
• The grate and ash pan are absent.
• Only the top layer of the loaded fuel burns. Air to maintain combustion (more precisely, smoldering) is supplied from above through a movable unit, which, under its own weight, descends as wood or coal burns out.
• Ashes are carried away with smoke.
• The area of ​​smoldering fuel is separated from the upper part of the chamber by a massive metal disk (slang name - stascoblin). Above it, air from the outside is added to the products of incomplete combustion of the fuel, and they burn with the release of residual heat.

As you can see, at their core, these devices are pyrolysis hot water solid fuel boilers, but with serious structural modifications. It is clear that even here the price tag will not please the economical owner.

Boilers operating on pellets - pressed pellets made from sawdust - stand apart. In them, the problem of autonomy is solved by the controlled feeding of granules from the hopper.

In the photo - a boiler with a pellet hopper.

However: in addition to being expensive, these devices have another problem. Pellet production in our country is not established; not everywhere you can provide yourself with this type of fuel.

Automation

In classic boilers, all automation is limited to the simplest protection against overheating of the coolant. The mechanical thermostat with a lever pulls on the chain covering the damper. The air intake rate decreases; the heat dissipation of the boiler is reduced.

There are much more possibilities in pyrolysis heaters:

• Dampers with mechanical or electrical control here, too, allow you to adjust the draft;
• Along with this, in devices with forced draft, their thermal power can be controlled by adjusting the speed of the exhaust fan.

In addition, it is possible to control not the temperature of the coolant, but the temperature of the air in the room.

Useful: Inexpensive Russian-made solid fuel boilers are usually operated by primitive mechanical thermostat or generally only manually. Do not look for devices among the younger models that can independently support comfortable temperature... However, it is precisely because of their simplicity of design that they are extremely fault-tolerant.

Advantages and disadvantages

Operating costs

At current Russian prices, purchased firewood is the second cheapest after main gas. The difference between them is small - a few percent. It is clear that we are talking about the cost of generating one kilowatt-hour of thermal energy.

Coal is more expensive, but not much.

Several more factors speak in favor of firewood:

• Main gas is not available everywhere, and heating with liquefied gas costs several times more and is close to electric heating in terms of costs.
• Firewood can be harvested on your own, which will reduce costs to zero altogether.
• Solid fuel heating will make it possible to usefully dispose of most of the household waste. The rest in a country house will go into compost and serve as soil fertilization.

The convenience of use

But in this area there are some disadvantages.

• Combustion products must be removed. Moreover, a coaxial outlet - an air intake, as in gas boilers with a closed burner, the utilization of furnace gases will not work. We need a full-fledged chimney.

This roof decoration is an invariable attribute of solid fuel heating.

• Solid fuel boilers exist only in floor-standing design. They are massive and large in size. In most cases, it is better for them to take separate room.
• The fuel should be stored close to the boiler, and under a canopy. Compare this requirement with the convenience of being connected to gas or electricity.
• Fuel filling and removal of combustion products are often required. Even in long-burning boilers, where there is no ash pan, in principle, you still have to clean the pan between the fuel fillings. Aside from the rather dirty work, this means one more thing: you can't go away for a few days and leave the house warm.

Installation

All devices of the type we are discussing can be mounted independently. No accounting and control of utilities is required.

However, a couple of rules must be followed.

• Massive boilers are mounted, as already mentioned, exclusively on their own foundation. Putting 300 - 500 kilograms of cast iron on a wooden floor is definitely not worth it.

In general, it is better to play it safe with lighter steel ones: for example, solid fuel boilers of Belarusian production KSV 12.5 with a modest power of 12.5 kW weigh 180 kg.

• The second instruction is related to fire safety... The boiler body and chimney become noticeably hot during fuel combustion. It is recommended to place the boiler at a distance of at least half a meter from the nearest wall.

If the walls are made of combustible material, they are protected by brick or galvanized sheet with asbestos lining.

The chimney is separated from the combustible structures of the ceiling or walls with a distance of at least 25 centimeters.

Conclusion

A lot of interesting things about what solid fuel boilers are - Russian-made and imported from abroad - will be told by the video at the end of the article. We hope that you will find there answers to those questions that might have remained with you.

1. Types of hot water solid fuel boilers
2. Pros and cons of a solid fuel boiler
3. Technical characteristics of TT boilers

For those living outside the city or just considering a purchase country house, the problem of heating is extremely acute. Main gas is absent in 34.5% settlements in Russia. There is also often no access to power grids when the village is new or when a house is being built at a distance from power supply lines. Therefore, a solid fuel heating boiler is sometimes the only available option.

Let's try to figure out what solid fuel boilers are, how they work and what they are. We will also consider their advantages and disadvantages, and the main specifications... We hope this material will help you decide which one is better to choose for heating your home.

Types of hot water TT boilers

A solid fuel boiler is a heating device that uses the energy of burning solid fuel. Most often it is firewood or coal. However, some manufacturers produce models that work on pellets and fuel briquettes.

By the type of solid fuel used, boilers are divided into:

• wood-burning

  This category includes conventional wood-fired boilers. Their downside is that wood has low heat transfer and burns out quickly. Therefore, it is necessary to add firewood to the firebox every 2-4 hours.

• coal

  Coal boilers operate on brown or black coal, anthracite, coke. The heat transfer of coal is 2 times higher than that of wood, besides, coal is more compact. One bookmark will last for 8-10 hours.

• pellet

  They work on special granules - pellets. They have a high efficiency of 85-95%. Their significant disadvantage is the high cost of the devices themselves and of the fuel for them.

• universal

  They can work on wood, coal or pellets to choose from. The efficiency of universal boilers is lower than that of those using one type of fuel. Manufacturers also produce two-fired models. Each type of fuel has its own combustion chamber and its own heat exchanger.

According to the material of the heat exchanger, they are divided into:

• cast iron

  The advantage of the cast iron heat exchanger is its high heat capacity and resistance to corrosion. Such products will last 30% longer than steel counterparts. The disadvantage of cast iron heat exchangers is fragility and sensitivity to temperature extremes. We also note that cast iron is 2-3 times heavier than steel, as a result of which even low-power models have to be installed on a concrete foundation.

• steel

  Boilers with a steel heat exchanger are 30-60% cheaper than their cast iron counterparts. The disadvantage of a steel heat exchanger is the formation of corrosion due to condensation water.

There are two ways to burn solid fuel: classic and pyrolysis. Depending on which method is used, all models are divided into two types:

• classic

  In classic boilers, the combustion process takes place naturally... They are characterized by simplicity of design, and as a result low price... Their disadvantage is their low efficiency (75-85 percent) due to incomplete fuel combustion.

• pyrolysis (or gas generating)

  A feature of these devices is that solid fuel and the gas emitted by it burns separately. This achieves a higher efficiency compared to classical ones (about 85-92%). Such devices are much more economical and environmentally friendly than classical ones. more expensive than traditional ones by about 1.5 times.

According to the loading method, solid fuel boilers are distinguished:

• with manual loading

  To maintain a constant heating temperature, it is necessary to manually add a new portion of solid fuel every 2-4 hours.

• with automatic loading

  The design of the heating system is complemented by bunkers for automatic fuel supply. Depending on the volume of the bunker and the amount of solid fuel in it, the battery life reaches from several tens of hours to one month.

According to the degree of dependence on electricity, they are divided into:

• non-volatile

  In volatile boilers, the air will be forced into the combustion chamber by a mechanical thermosyphon.

• volatile

  Volatile boilers use an electric fan to force air into the combustion chamber. This process is controlled by an electronic unit that requires an electrical connection.

We figured out the classification, now let's look at the device and principle of operation of the TT of the heating boiler. It consists of the following components and assemblies:

• Combustion chamber

  The fuel combustion process takes place in this section of the boiler;

• Heat exchanger

  This device is made of cast iron or steel. It transfers the energy of the burning fuel to the coolant;

• Cleaning hatch

  Especially the hole in the ash pan. Ash and combustion waste are extracted through it;

• Grate

  A metal grate between the combustion chamber and the ash pan on which the combustion process takes place. Ash falls through holes in the grate into the ash pan, from where it is then manually removed;

• Thermostat

  A mechanical or automatic device that regulates the intensity of combustion, and therefore the temperature of the coolant;

The operation of a boiler with a water heating circuit is very simple. Solid fuel is placed through the loading door into the combustion chamber. During combustion, the heat exchanger heats up and transfers energy to the heat carrier, for example water. The coolant circulates through the heating system, heating the room. Ash and other wastes from combustion accumulate in the ash pan.

Pros and cons of a solid fuel boiler

Any heating device has its own advantages and disadvantages. Let's weigh all the pros and cons of TT boilers. The advantages of solid fuel heating devices include:

• fuel availability

  Wood and coal rank first in terms of common types of fuel in Russia and in the post-Soviet space. Forests cover 46.5% of the territory of our country.

• low cost

  For many of us, the cost of a product is critical. The cost of solid fuel models is significantly lower than gas or electric models.

  For example: a solid fuel boiler Dakon with a capacity of 24 kW costs 52,000 rubles, and a gas boiler of the same capacity - 97,000 rubles.

• lack of dependence on the power grid

  In many villages and country houses there is no power supply. Therefore, this quality of solid fuel boilers in this case is very useful.

• long service life

  With proper care and maintenance, timely cleaning and careful operation, the service life of solid fuel boilers reaches 30 years.

We figured out the advantages, now let's talk about the disadvantages:

• the need for constant monitoring

  The fuel in the firebox burns out quickly. It is necessary to carry out repeated loads every 2-4 hours to maintain the required temperature in the room.

• difficult and time consuming care

  Caring for a solid fuel boiler is not an easy task. It is necessary to remove ash from the ash pan in a timely manner, as well as to clean the combustion chamber from soot. It is better to entrust complex works such as cleaning from scale, rust and tar deposits to professionals.

• low efficiency of solid fuel combustion

  Compared to fuels such as gas and diesel, solid fuels have a low combustion efficiency. The combustion process leaves waste in the form of ash, while gas and diesel do not leave waste.

• need for fuel storage

  Firewood and coal have quite impressive dimensions. It is necessary to equip a separate room for storing their stock.

• inertia of the combustion process

  main feature solid fuel boilers - their high inertia. The combustion process must not be interrupted quickly. The boiler will continue to heat the water in the heating system even if it is already overheated. One way to solve this problem is to install a heat accumulator (buffer tank).