Solid fuel boiler Stropuva: review, owner reviews

Types of boilers Stropuva

Long-burning solid fuel boilers operating on wood and wood waste. They are completely independent of the power supply and will heat the room even if there is no electricity. These include models: S-7, S-10, S-20, S-40.
Universal long-burning solid fuel boilers operate on several types of fuel: firewood and wood waste, sawdust or peat briquettes, coal, regardless of their quality and humidity level. Such a unit requires connection to the electrical network, this is necessary for the regular supply of oxygen to the firebox; it consumes about 20 W per hour, which is very economical. Models of universal boilers: S-10U, S-20U, S-40U.

The boilers of this company are completely safe to use; if the load is exceeded, which is permissible, or if there is severe overheating, the boiler will not explode; its design is made in such a way that it will shrink inward. The boilers are equipped with a large-volume firebox, which allows you to add a large amount of fuel at once, which will gradually burn through thin layers. As it burns out, the air distributor lowers, as a result of which the heated gases rise into the chimney, giving off heat to the inner walls of the boiler.

Operating instructions for boilers Stropuva ↑

First of all, you will need to adjust the bimetallic valve. To do this, before the first kindling, use the adjusting screw to set a gap of 3-4 cm between the heating chamber and the damper. Next, the boiler is ignited and when it reaches 70°C (if wood) or 85°C (if coal), the damper is lowered with the same screw, stopping the further increase in water temperature.
Firewood is laid horizontally until the firebox is fully loaded, and a layer of wood chips and sawdust is poured on top. You can use kindling liquids for stoves. It is possible to replenish fuel during operation, but this reduces combustion efficiency for a short time.
To use coal, the boiler must be equipped with an air supply manifold. The coal is ignited using firewood weighing about 5 kg, loaded on top. When the boiler is operating, the fuel is never mixed - this can lead to combustion failure.
It is not recommended to use too fine fractions - both wood and anthracite or coal. After the bookmark burns out, it is necessary to remove the remaining ash.

Reservation of work

The Stropuva boiler will delight you with long-lasting fuel combustion. But even in this case, you can miss the moment of the next bookmark. As a result, the temperature of the coolant in the heating circuit will begin to fall. To prevent this from happening, we recommend installing a backup electric boiler in the circuit. If it detects a temperature drop below the set limit, it will turn on and maintain the set temperature.

Electricity consumption will be small if you don’t forget to add firewood for 2-3 days. The vast majority of the time the boiler will burn, providing heat to consumers. Therefore, you should not expect huge expenses. In addition, the auxiliary boiler does not have to be as powerful as the main one - a model with a power 2-3 times lower is quite enough so as not to make your teeth chatter in the morning. We also recommend working on insulating your home so that it retains the accumulated heat longer.

Consumer reviews ↑

We were able to collect several reviews from conversations with users of Stropuva boilers in Russia.

Vasily Nikolaevich Nazarov: Before last season, I bought an S20U boiler for my woodworking workshop. Once every 5-6 days you fill a full bunker with coal - and that’s it, no problems. With pieces of wood, of course, there is more hassle, but I still need to put them somewhere.

Oleg Vladimirovich Serov: The main thing is to correctly determine the required power. There is no point in taking based on the principle: the more, the better. Each model will be effective where it is designed, and the price will be higher - why overpay?

Andrey P.: I have a dacha, there’s not even light there always. At first I tried to heat it with gas from cylinders, it was a hassle and too expensive. Now I have installed a small wood-burning unit with ten kilowatts, the car has enough firewood for the winter. I heat it 2-3 times a week, the house is 6x12 meters plus massandra, I haven’t seen any shortcomings yet.

Main models

You can buy a Stropuva boiler in specialized stores that are dealers of the manufacturer, as well as in online stores. The minimum price is 60 thousand rubles for the minimum power model. Let's continue the review with a description of the models being produced.

Stropuva Mini S8

Before us is the smallest wood-burning boiler with a power of 8 kW, designed to heat rooms up to 80 square meters. m. It works on wood briquettes and firewood, is equipped with a safety valve and a thermometer. The heating temperature of the coolant is from +60 to +95 degrees. The maximum pressure in the circuit is up to 1.5 Bar. The efficiency of the model is 85% - a pretty good result for solid fuel equipment. The estimated cost of this boiler is 61 thousand rubles.

Stropuva Mini SP8

This boiler differs from the previous model by supporting operation with pellets. In this mode, it needs to be connected to an electrical network with a voltage of 220 Volts - the electricity is used to operate the fan used in the fuel ignition system. When working with wood and briquettes, the boiler operates in autonomous mode. The remaining parameters are almost 100% similar.

Stropuva S20

One of the most popular models. It allows you to heat residential buildings up to 200 square meters. m. The boiler is built according to an energy-independent scheme; briquettes and ordinary firewood are used as fuel. Burning time is up to 31 hours. If you want to forget about adding fuel for several days, we recommend purchasing the Stropuva S20U modification - it can run on coal, providing up to 120 hours of continuous combustion. The Stropuva S20P model can work on pellets for up to three hours.

Stropuva S40

Before us is the most powerful boiler in the entire line. Its thermal power is 40 kW, combustion duration is up to 31 hours, heated area is up to 400 sq. m. The device is equipped with a rather impressive heat exchanger jacket that holds 58 liters of water. The maximum pressure in the system is up to 2 atmospheres at an average temperature of up to +75 degrees. Over 90 kg of firewood is placed in the combustion chamber of the device. Modifications for working on pellets and coal are also available.

Other models and manufactured modifications

Also on sale are solid fuel boilers from the Stropuva company with a capacity of 15 and 30 kW. They are designed for areas up to 150 and 300 square meters. m. All models discussed in the review are available in three modifications:

The main one is that the equipment runs only on wood and fuel briquettes (euro firewood).
With index P – the possibility of working on pellets is provided, burning up to 72 hours.
With index U - units with the ability to operate on coal, burning time up to 120 hours.

Naturally, the actual burning time may be shorter - it depends on the characteristics of the fuel (type of wood, degree of dryness).

Some people have design requirements for heating equipment

If you really care so much about how the boiler looks, then we have good news - Stropuva produces its equipment in several colors. The main color (and most common) is yellow. It is possible to purchase boilers in brown, blue, red, green and black colors

Spotted colors are also available (yellow and dirty green)

It is possible to purchase boilers in brown, blue, red, green and black colors. Spotted colors are also available (yellow and dirty green).

Boiler power

When choosing a quality boiler, you should always pay attention to its power. The size of the room that can be heated will depend on this indicator.

So that everyone can choose their own option, they produce boilers of three different classes. They all have different powers and can be used in different conditions. Some are suitable for small houses and sheds.

Other boilers (solid fuel) Stropuva, in turn, are intended for large shops and warehouses. First class units have a power of 10 kW, and they are capable of heating up to 100 sq. m. The second type at 20 kW can already cope with a room of up to 200 sq. m. m. Solid fuel boilers Stropuva of the third class have the highest power - 40 kW. This is quite enough to heat an area of up to 400 square meters. m.

Boilers "Stropuva"

Today it is a leader in the production of solid fuel boilers. At the same time, it is able to offer many modifications. All this allows the buyer to choose the desired option based on the power of the device, as well as its dimensions. Stropuva boilers operate successfully using coal and wood.

Also, some people prefer wood chips. In this case, the temperature in the house will rise very quickly, but in this situation the user will be forced to bookmark it frequently. This is due to the fact that the wood chips burn out quite quickly. It is worth mentioning separately the various modifications. Features include heat-resistant windows, high-quality chimneys, and large dampers. In general, setting up Stropuva boilers is quite simple. At the same time, they have an interesting design. In terms of pricing policy, the company is quite soft and meets the consumer halfway.

How to start a Stropuva boiler

First, you need to purchase a piping kit to connect the equipment to the heating system. We recommend purchasing a kit with the ability to connect an indirect heating boiler. It includes a set of pipes, a safety group, an expansion tank and a circulation pump. Also on sale are kits for connecting underfloor heating.

It is not recommended to use damp firewood - this will interfere with the normal operation of the boiler.

Ignition is carried out in the following way - here are brief instructions for use:

We load the wood combustion chamber full with the air distributor raised.
We fill the finished masonry with sawdust.
Open the flap for switching to wood.
Open the air damper 3-5 cm.
We light the top layer, close the loading door, leaving a gap 3-5 cm wide.
We wait for reliable combustion, close the loading door and immediately lower the air distributor.

Please note that the cleaning door must be closed. A new portion of firewood can be added to the Stropuv boiler at any time, but doing this with coal is dangerous. In any case, the manufacturer recommends that you always wait until the fuel burns out completely before adding a new portion.

In any case, the manufacturer recommends that you always wait until the fuel burns out completely before adding a new portion.

A new portion of firewood can be added to the Stropuv boiler at any time, but doing this with coal is dangerous. In any case, the manufacturer recommends that you always wait until the fuel burns out completely before adding a new portion.

Operating principle of Stropuva boilers

These are top combustion boilers, which gives them a lot of advantages. The fuel in this boiler is ignited from above and burns in thin layers, gradually falling down, this allows you to significantly increase the burning time of one load of fuel. This technology also allows for the release of much more heat, even during long-term smoldering.

high efficiency, eliminating constant thermal load

This also made it possible to reduce the thickness of the boiler walls and, accordingly, reduce its weight, which is important. These boilers help save money and time; many of them require very little human intervention. Long-burning boilers operating on wood need to be loaded with fuel once every 30 hours; when using briquettes, loading is done every two to three days, and when operating on coal, the boiler can maintain heat for up to five days without adding fuel.

Advantages and disadvantages ↑

Sectional diagram of the Stropuva boiler

It is worth briefly listing the main advantages of Stropuva boilers:

Cost-effectiveness and convenience - their installation does not require an expensive gas supply, and the long duration of work on a one-time fuel supply saves money and time.
Energy independence - there are no electronics in the design, so wood-burning boilers, when used in a gravity heating system, do not require electricity.
Safety and reliability - one of the advantages is control using a bimetallic valve - a simple and trouble-free draft regulator.
Aesthetics along with simplicity - STROPUVA boilers differ from similar types of devices in their elegant appearance and compact placement. The clear design of the unit eliminates any difficulties during operation.

Among the disadvantages, the following can be noted: their performance is greatly affected by the humidity of the loaded fuel. But this is rather a minus of all solid fuel boilers, and not of a specific brand in particular. The solution here is simple - keep firewood or coal in a dry place.

Characteristics of Stropuva boilers

You can consider the technical characteristics related to a specific model, highlighting the advantages and disadvantages of the boiler.

Solid fuel boiler Stropuva S-10

This unit has a floor-mounted installation type, operates on wood and wood waste, the main material is steel, the boiler type is single-circuit.

Main characteristics:

power - 10 kW;
heated area - 100 m²;
Efficiency - 87%;
the volume of water in the boiler is 34 liters;
chamber capacity up to 25 kg of firewood;
the length of the log should not exceed 35 cm;
firebox dimensions - 350*210*250 mm;
general dimensions: height - 192 cm, diameter - 45 cm;
weight - 185 kg;
country of origin - Lithuania;
average price from 80,000 rubles.

This boiler has an aesthetic appearance, fits well into any room, takes up little space, has a cylindrical shape and a pleasant light color. It does not have many parts, the design of the boiler is simple, the room does not become dirty during operation, and the burning time from one load of firewood is up to 30 hours.

This unit may well compete with other gas or electric heating devices. It ensures environmental friendliness and good cost-effectiveness throughout its operation, which can last more than 25 years.

Solid fuel boiler Stropuva S-20U

This is a universal long-burning floor-standing boiler. The work is carried out using wood, peat and wood briquettes, coal, without taking into account the level of humidity and quality of the fuel. The boiler is easy to operate; with one full chamber load of coal it can heat a room for up to five days without outside intervention. Technical characteristics of this boiler:

power is 20 kW;
the area of the heated room can reach 200 m²;
Efficiency - 85%;
the volume of water in the boiler is 45 liters;
the firebox can accommodate up to 130 kg of coal at a time;
opening dimensions for fuel loading - 220*260 mm;
general dimensions: height - 2100 cm, diameter - 560 cm;
boiler weight is 246 kg;
country of origin - Lithuania;
the average cost is about 120,000 rubles.

Such a unit is quite popular; it can be placed in a small room, while it operates in a completely environmentally friendly manner and provides good cost savings due to the low cost of fuel consumed.

Guide to self-assembly of a Stropuva boiler

Before starting work, prepare the necessary equipment for this.

You won’t need any extremely difficult to use tools or hard-to-find materials. However, it is better to collect everything in advance so as not to be distracted by searching for missing elements in the future.

Stropuva boiler assembly kit

Metal barrel. Use a large container with a capacity of 200 liters or more.
Welding machine.
Thick-walled metal pipe.
Fiberglass.
Metal channels.
Asbestos.
Chisel.

The function of the body of the heating unit in question will be performed by a large metal barrel. You can use either new or old container. The main thing is that the barrel does not have through holes and signs of severe corrosion damage.

The function of the body of the heating unit in question will be performed by a large metal barrel

If possible, it is best to use a Soviet-made barrel. Such products are much more durable and high quality compared to their modern counterparts.

If you have access to a rolling machine, you can purchase a large sheet of metal and use it to assemble the boiler body. The recommended sheet thickness is 2.5-3 mm. The optimal dimensions are 125*250 cm. At the end you should get 2 cylinders with a diameter of 50 and 45 cm.

Furnace assembly

The work of making a sling boiler is carried out in a few simple steps.

First step. Clean the barrel from all sorts of contaminants, and then cut a hole in its top. That is, you simply need to “knock out” the top of the container to gain free access to its interior.

Sheet metal housing

Second step. Cut a small piece from a metal pipe with a diameter of about 15 cm. From it you will make a pipe for connecting the chimney.

Third step. Cut a hole in the side wall of the barrel to install the previously prepared pipe, and then weld a section of the smoke exhaust pipe to the finished hole.

Hatch for cleaning ash

Fourth step. Take the previously cut top of the barrel and make a hole in it with a diameter of about 100 mm.

Double fuel loading hatch with asbestos gasket

Fifth step. Prepare a pipe with a diameter of 10 cm and weld it to the hole prepared in the previous step. The length of the pipe should slightly exceed the height of the barrel.

Double wall boiler with asbestos lining

The holes in the inner cylinder are pre-cut

The external hole was cut and the exhaust pipe was welded in

Sixth step. Take 4 metal channels and weld them along the radius of the boiler lid. You need to weld at every 45 degrees of the circle.

A pancake with an air supply pipe was made

Seventh step. Weld a pre-prepared pipe to the back of the cover. Place the lid on the barrel.

Eighth step. Make a damper for the blower pipe. By changing the position of this damper, you can set the desired intensity of traction.

Brief characteristics of STROPUVA boilers

The declared fuel for such boilers is any kind of solid fuel and, as manufacturers say, the efficiency of these boilers reaches 90%.

The innovative technology used in the design of the boilers allows them to work with one load of firewood for up to 30 hours, with special fuel briquettes for up to 48 hours, and with coal for up to 5 days.

The buyer can choose a boiler option based on power:

7 kW for areas from 20 to 80 m²;
10 kW for an area from 50 to 100 m²;
20kW for an area from 100 to 200m²;
40 kW for areas from 200 to 400 m².

As you can see, the choice is quite wide and the buyer can easily choose a small solid fuel for a utility room or a huge house, and even a workshop.

Patented combustion scheme ↑

The long-burning solid fuel boiler under the Stropuva brand is well-deservedly popular in the country due to its certain fuel versatility and affordable price.
Heating boilers using solid fuels are widely used when there is no possibility of connecting to a gas main or in places where there are problems with the electricity supply. In such cases, wood, coke or coal can be used as fuel. Also, these devices are in demand as a backup (additional) heat source.

The manufacturer of Stropuva products is a Russian-Lithuanian company that produces solid fuel boilers, the operating principle of which is based on a patented top-down combustion scheme. The long period of fuel combustion ensures continuous operation of the boiler for up to several days.

Stropuvo boilers offer such advantages on the heating market as a unique (up to 5 days!) combustion duration on one load of solid fuel, as well as energy independence and simplicity of design

Recommendations for installation and operation

To install the device, choose an isolated room equipped with forced ventilation or an opening window. The height of the boiler room ceilings must be at least 2.5 m, the area - from 4 sq. m. Installation work is carried out strictly according to the instructions.

Installation features:

the boiler is installed on a concrete foundation 10 cm high from the floor or on a non-combustible base;
the bottom is lined with concrete mortar, the joint is sealed with heat-resistant sealant;
maintain the following intervals: in front - at least 1 m of free space, in the back - 0.6 m, on the side to the wall - 0.6 m;
The connection points between the device and the chimney and heating system are carefully sealed.

The heat generator is a source of increased danger. The boiler room must be equipped with fire extinguishing equipment and a container with sand for emergency fire extinguishing.

Other operating features:

Do not store fuel or other flammable materials near the heating device;
once a month it is necessary to check the condition of the chimney using a mirror, and if necessary, clean it from soot accumulation;
operation in systems with forced circulation is not allowed if the pump fails or there is a power outage;
When heating with wood, ash is removed as needed;
when using peat or coal, the ash pan must be cleaned every time before refilling;
It is advisable to lubricate the distributor lifting cable with oil to prevent wear;
It is necessary to inspect the doors for tight closure.

Reservation of work

The use of two or more boilers in a heating system is justified by the risk of failure of one of the devices. The circuit is also used to quickly increase power if necessary.

Stropuva units are easily assembled in a cascade, thereby increasing the reliability of the heating system.

Advantages of cascade installation:

uninterrupted operation (if one device fails, the other will continue to operate);
increased power (in the off-season you can use one unit, in winter - two);
ease of repair and maintenance;
saving space in height (for limited spaces - attics, basements).

What fuel is suitable

There are several suitable types of fuel.

Stropuva units heat:

Hardwood. The logs are placed evenly throughout the volume of the firebox. Long ones are in the middle, short ones are at the edges. The stack should be completed with large firewood and approximately 0.5 kg of wood chips or shavings for ignition. Wood fuel leaves a lot of ash that needs to be removed regularly.
Wood briquettes. Briquetted material burns longer and more evenly than firewood. It is laid horizontally. For kindling, take small dry wood chips.
Peat and briquettes made from it. When burned, the material emits a characteristic sour odor. When working on peat raw materials, the boiler emits more harmful substances into the atmosphere than when using wood. This type of fuel should not be used in urban environments.
Large anthracite. It is used only in conjunction with wood, otherwise it will not burn well. It is recommended to remove unused pieces from the ash and add them to the firebox the next time you add them.
Coal. For ignition, combine with wood. Low-quality coal is laid in layers, alternating with logs.

Recommendations for each type of fuel are presented in the table.

Solid fuel boiler "Stropuva S10U"

The first representative of the Stropuva family. The boiler has good reviews for its versatility. People like that it runs on both wood and coal. In this case, you can use various wood waste and sawdust briquettes. This device is suitable for any room where there is a heating system. It should include radiators or boilers. Houses with floor coils are also suitable. It's best when you have everything. In this case, the efficiency will increase significantly. This class of boilers is used not only in closed forced heating systems.

Additionally, these devices can be successfully operated in electrically independent systems. In some cases, it is even possible to install in rooms with gravity-fed heating. Users note that a characteristic feature of this model is its efficiency. At the same time, the temperature is able to remain at a stable level for a long time. The price for Stropuva boilers is low, 55,000 rubles.

Review of model range and prices

The range of heating devices in Stropuvo is represented by products of various capacities and configurations. Let's look at the popular models of Stropuva solid fuel boilers and their prices.

Mini S8

Stropuva Mini S8 is a solid fuel single-circuit wood-burning device with a low power of 8 kW. Suitable for heating small rooms from 50 to 80 square meters. m. The installation has modest overall dimensions: height - 1.35 m; diameter - 0.56 m. The firebox can hold up to 37 kg of firewood up to 40 cm long. The maximum operating time on the stack is 18 hours. The dimensions of the loading door are 23x21.5 cm. The model has a basic configuration, including cleaning accessories: a poker and a scoop.

The cost of the model is 53,000 rubles.

Prices for the Stropuva Mini S8 boiler

Stropuva Mini S8

Mini SP8

Unlike the previous model, it is equipped with a grate and an air injection fan. Heating with pellets increases the burning time of one portion to 48 hours.

Price for Stropuva Mini S8P: 56,500 rubles.

Prices for the Stropuva Mini SP8 boiler

Stropuva Mini SP8

S20

Wood-burning version with a power of 20 kW (firewood and briquettes). Capable of heating a room of 100-200 square meters. m. The firebox holds 60 kg of firewood. This is enough to work for 31 hours. The height of the device is 2.1 m. The diameter is standard.

Cost - 85,500 rubles.

S40

The most powerful option is 40 kW. Works on wood. Suitable for residential and industrial buildings with an area of 200 to 400 square meters. m. The loading zone can accommodate up to 93 kg of logs up to 45 cm long. The combustion cycle is up to 31 hours. The design is distinguished by an oversized loading door of 24x23 cm and a diameter of 0.68 m.

The price of Stropuva S40 is 98,600 rubles.

Prices for the Stropuva S40 boiler

Stropuva S40

Other models

The Stropuva model range is represented by versions of 8/15/20/30 and 40 kW with a heating area from 50 to 400 sq. m. m. Basic wood-burning models are marked with the letter “S”. The letter “P” in the name stands for pellet heat generator. Unlike the basic version, it works longer on one tab - up to 72 hours. It is heated with both wood and fuel pellets. The letter “U” denotes universal boilers. Such devices can burn for up to 5 days on coal.

Technical characteristics and features ↑

The Stropuva boiler consists of two cylinders, between which the coolant passes. Access to the combustion zone is through the upper and lower doors. Heated air from a special chamber enters the top layer of fuel; as the wood or coal burns out, the air distributor moves down and is always located in the combustion area. A draft regulator is used to regulate the water temperature and the amount of air required.

Stropuva long-burning boilers are available in two types: universal and wood-burning . On universal varieties there is a forced air flow to increase combustion intensity. The optimal operating mode is achieved within 2-3 hours and is maintained evenly throughout the combustion time of one portion of fuel.

Different Stropuv models make it easy to select a boiler for each room, based on the following technical characteristics:

Power – from 7 to 40 kW
Heating area – 50-400 sq.m.
Burning duration – from 6 to 130 hours
Volume of fuel placed – 150-320 cubic dm
Equipment weights – from 180 to 330 kg

All boilers have high efficiency (86.3-86.8%) and an operating coolant temperature of about 85°C.

The duration of operation of the boiler at one load, and therefore its performance, depends on the fulfillment of certain conditions:

The degree of insulation of the room and the correct choice of device power.
The quality of fuel, determined by such parameters as its humidity, ash content and composition.
Proper organization of the heating system as a whole.
Optimal draft in the chimney.
Professional installation.

What do they say about the “Etalon” model?

The long-burning solid fuel boiler “Etalon” has good reviews. Many buyers appreciated this model for its high power and high efficiency. At the same time, the obvious disadvantage is the dimensions of the solid fuel boiler. In some cases, it is quite difficult to install it in the house. Additionally, flammable materials should not be located near it. Otherwise, everything may end in fire.

Another disadvantage is considered to be the absence of a window in the loading chamber. Thus, the owner is deprived of the opportunity to observe the combustion process. As a result, you can only check the remaining firewood by opening the loading chamber. In general, this is unacceptable for modern models. Additionally, opening the loading chamber is accompanied by a drop in temperature. The advantages of this model include durable valves. At the same time, steel cables are installed in them, and they are able to withstand heavy loads. In general, the cases are made to be durable and hold the temperature well. This also greatly simplifies the process of transporting and installing equipment, since mechanical damage to this model is not terrible, since the thickness of the metal is quite impressive.

Features of solid fuel boilers Stropuva

The main difference between Stropuva units is long burning. It is achieved by combining the principle of upper layer-by-layer combustion and the design features of the product.

Device

The boiler design is a shaft of two steel cylinders located one inside the other. The coolant, water, circulates between them.

Inside the smaller cylinder are the combustion chamber and the air heating zone. A heated air flow is supplied from above into the firebox using a telescopic pipe with an air distributor at the end. The air duct rests on the fuel and descends with it as it burns out.

The body is lined with thermal insulation. On its front panel there are two doors: the loading chamber and the ash pan.

Principle of operation

The device implements the combustion principle from top to bottom. It allows fuel to burn more slowly, providing more efficient use of thermal energy. The bookmark is set on fire from above. Only the surface layer of the fuel material burns. As it burns out, the hearth gradually sinks into the lower layers. This ensures uniformity and duration of operation of the unit on one portion of fuel.

More details about the operation of the Stropuva boiler can be seen in this video.

Advantages

Buying such a heating device would be reasonable, because it has many advantages, which we will consider in more detail.

Advantages of Stropuva boilers:

Economical. The method of layer-by-layer combustion from above, unlike the traditional one, does not create “excess heat” thrown into the chimney. Thermal energy is released evenly and manages to be almost completely transferred to heating the coolant, and not the street. The boiler does not waste fuel resources.
Energy independence. To operate the heating device in the basic version, no connection to the electrical network is required. It is completely autonomous.
Safety. The absence of electrical and gas components reduces the risk of accidents. If used incorrectly, the unit may fail and become deformed without causing harm to surrounding objects and people.
Long combustion cycle. On one stack of firewood, the firebox operates for up to 30 hours. On coal and pellets - even longer. The device will have to be serviced less often than once a day. Ideal for those who value their time.
Low waste. It is enough to clean the ash chamber a couple of times a month. Thanks to complete combustion, there are practically no combustion residues and resins left.
Efficiency. Efficiency of 85% is much higher compared to traditional water heating devices.
Design and dimensions. The device has a modern appearance and does not take up much space in the room.
Wide palette of 7 body colors. A harmonious solution can be chosen for any interior.

Flaws

It is necessary to keep in mind some of the disadvantages of such boilers.

Disadvantages of Stropuva devices:

Cyclicality. The boiler goes through the stages of kindling, combustion and end of operation, regardless of the duration of the cycle. Periodically, you have to refill a fresh portion of fuel, remove the ash, and re-ignite the firebox.
Inconvenient loading window. It is inconvenient to load and distribute firewood through the small door.
Price. To buy a Stropuva boiler, you will have to spend an amount comparable to the cost of a gas boiler.
High requirements for fuel quality. It is allowed to burn material with a moisture content of no more than 20%. Otherwise, tar and soot will form on the inner walls.

How do Stropuva boilers work?

Let's see how it is customary to start a traditional solid fuel boiler. First, we ignite small chips, and when they take up the flame, we begin to throw full-fledged firewood into the firebox. Our heat source is located below, under the wood stack. This is where the combustion spreads. As a result, the firewood burns out in a matter of hours, and a lot of thermal energy often flies away into the chimney.

Stropuwa boilers are built on the top combustion principle. In this way they are similar to Bubafonya wood stoves - here the wood is lit from above, not from below. The prototype of these furnaces were Stropuva boilers, which have a similar operating principle. Depending on the power of the selected unit, the combustion duration can be up to several days.

The Stropuwa boiler consists of the following elements:

Combustion chamber – starts from the very bottom of the equipment.
Heat exchanger – here a “jacket” of the “pipe-in-pipe” type is used. The coolant flowing through it ensures efficient heat intake and transfer to the heating system.
Air distributor - it is located above the combustion zone and supplies air to it.
Draft regulator – allows you to adjust the heating temperature of the coolant.
Air heating chamber - it is responsible for heating the air masses supplied to the combustion zone. This design ensures efficient combustion of wood.

Air is taken in through a damper, combustion products are removed through a pipe in the rear (the chimney is connected to it). There are two doors in the front part - for loading fuel and removing ash.

The Stropuva solid fuel boiler has a long burning time. On one load it can work for up to several days - it all depends on the heated area, the current operating mode and the thermal power of the unit. Dried firewood, pellets, fuel briquettes or coal are used as fuel. According to the manufacturer, the burning time on coal is up to 5 days.

Advantages of solid fuel boilers "Stropuva"

First of all, Stropuva long-burning boilers mean savings. In this case, the fuel burns very slowly. If you use firewood and lay it in the right way, then this will be enough for as much as 30 hours. If you use fuel briquettes, you can maintain the temperature in the room for two days. In turn, coal filling is considered the most effective. It can heat a house for five whole days.

You should also take into account the high efficiency factor in this case. This figure in some cases reaches 90%, so Stropuva boilers are very productive. Additionally, mention should be made of the ease of operation of these devices. For their successful work it is not necessary to invite specialists. It is enough just to periodically remove the ash from the boiler. Manufacturers advise doing this at least twice a week. For its achievements in the field of heating systems, it received an EU quality certificate in 2005.

Checking the boiler after assembly

Before accepting a homemade Stropuv boiler for permanent use, be sure to ensure that it is in good working order and reliable. Don't ignore this step. The safety of further operation of the heating unit directly depends on a correctly performed check.

Fill the barrel with wood to about a third of the height. Add some kerosene and throw a lit match into the container. Ideally, the wood will ignite almost immediately. At the same time, you should not notice the presence of smoke, or any draft, or any kind of uncharacteristic odors.

STROPUVA

If any of the above symptoms are present, do not use the boiler. Such equipment is very likely to soon fail and harm its owners. But if you assembled the unit in strict accordance with the instructions above, there will be no problems.

The amount of firewood given earlier will be enough for approximately daily heating of a small room. If the room is medium sized, double the loading volume.

Thus, you can assemble an excellent sling boiler for heating a variety of small and medium-sized rooms with your own hands. Now you don’t have to spend a lot of money on buying expensive equipment. You just need to follow the instructions in everything and your home will always be warm and cozy.

Good luck!

Video - Do-it-yourself sling boiler

What does a solid fuel boiler consist of?

In the upper part, solid fuel heating boilers have an air damper that regulates the pressure inside the device. Next to it is a bi-thermal draft regulator. This, in turn, is connected to the support rod. Inside the cylinder there is a large air heating chamber. There is also a hole on the boiler body designed specifically for the removal of gases. There is a switching damper at the bottom of the air heating chamber. Next comes the air supply pipe.

On the front panel of the boiler there is a door for storing firewood. Behind it there is an air distributor. The fuel itself is located there. At the bottom of the boiler there is a special door for removing ash. The cable with the ring is designed to lift the air distributor. Below it there is a hook and a coolant pipe. On the left side, heating boilers have a coupling for a thermometer. Manufacturers also provide a mechanism for the valve, which is responsible for pressure. A lever is installed near the base of the boiler to switch the damper. It is located near the air supply pipe. With its help, you can easily choose between loading coal and firewood.

Design and principle of operation of the Stropuva boiler

The heating unit is based on two cylinders, one of which is placed inside the other. The outer cylinder is made of steel. Wall thickness up to 4 mm. The inner cylinder, whose wall thickness ranges from 4-6 mm, can be made not only from steel, but also from cast iron, which improves its operational and technical characteristics. There is water between the cylinders. This is precisely the area of the boiler water jacket. This is where heat is taken in and distributed throughout the heating system. The heating of the coolant is easily regulated using the draft regulator.

The inner cylinder is the combustion chamber. Here the design also provides a telescopic distributor, which touches the fuel and, as it burns, moves down. Air is also supplied through it to support the combustion process. Air masses are taken in through the damper. It is noteworthy that air is supplied only to the combustion zone. It's already warmed up enough. This is ensured by the air heating chamber included in the design of the Stropuva boiler.

So, the intensity of combustion and, accordingly, the temperature of the coolant depends on the volume of supplied air. A strong draft is created in the boiler as it is connected to the chimney. The smoke from the boiler practically does not enter the room; it is drawn out of the room by the chimney. The boiler design has a door for loading fuel, it is located in the upper part. At the bottom of the boiler there is a door for removing ash.