Solid fuel boiler of long burning

An effective heating system is crucial for maintaining a warm and comfortable home. A long-burning solid fuel boiler is a common choice among homeowners. These boilers are a dependable option for heating homes, particularly in colder climates, because of their capacity to deliver consistent heat over prolonged periods of time. This capacity has led to their increasing popularity.

In order to produce heat, a long-burning solid fuel boiler burns solid fuels like coal, wood, or pellets. These boilers burn fuel slowly and efficiently, so they don’t need to be refueled as often as traditional boilers, which lengthens the time between refills. As a result, homeowners will have less trouble and a more reliable supply of heat for their houses.

The affordability of a long-burning solid fuel boiler is one of its main benefits. Solid fuels are a cost-effective option for homeowners trying to cut their heating expenses because they are frequently less expensive than other heating sources like gas or electricity. These boilers’ long burning times also result in lower overall fuel consumption, which lowers heating costs even more.

Long-burning solid fuel boilers are not only economical, but also ecologically beneficial. The carbon footprint of heating your home is decreased when solid fuels are burned because they release fewer greenhouse gases than fossil fuels do. To further reduce their impact on the environment, a lot of solid fuel boilers are made to be extremely efficient. This guarantees that the fuel is converted into the most amount of heat possible.

Solid fuel boilers with extended burn times provide homeowners with peace of mind when it comes to dependability. Compared to more intricate heating systems, they are more robust and less prone to malfunctions because of their straightforward design and solid construction. These boilers are a smart investment for any home because they can provide dependable heating for many years with the right upkeep and care.

Advantages 1. Efficient heat production
2. Cost-effective fuel source
Disadvantages 1. Requires regular maintenance
2. Emissions need proper ventilation

Sifty fuel boilers device: options and opportunities

More types of heating equipment, such as solid fuel boilers, are designed to operate entirely on their own when heating individual homes, particularly suburban mansions situated in rural areas. The conventional implementations of these units don’t require electricity or gas sources, and they can heat a home’s office and residential spaces with excellent and reasonably priced heating provided that raw materials such as coal, firewood, peat, and pellets are available.

1 conventional solid fuel boiler for rice

In this instance, the design and operation principle of the boiler fully dictate its solid fuel device. Examine the primary categories of contemporary structural solutions for this kind of equipment, along with a volume analysis of their advantages and functional aspects.

Classification of solid fuel heating boilers

The majority of the time, the standard implementations of the units in question (which are the products of the authors’ engineering creativity for purely particular life circumstances and are therefore self-taught creations from heat engineering and should not be taken into account) consist of:

  • Traditional boilers.
  • Pyrolysis boilers.
  • Long burning boilers.

Together with this broad classification, solid-fuel boilers can also vary in terms of the fuel type (wood, coal, pellets, etc.), the type of case they are made of (steel or cast iron), the number of heating contours (one or dual circuit), and the types of controls that regulate the unit’s operation (mechanical and electronic control systems).

Next, submissive units of the most popular structures are taken into consideration. Water is used as a coolant, though air and steam are also options.

The principle of operation of traditional boilers working on solid fuel

These boilers, regardless of the manufacturer, borrow some features from a well-known Russian furnace. The subtleties mostly relate to the fuel loading technique (frontal vs. upper).

When there are limitations on the space that is ready for this equipment to be installed, the first option makes more sense.

The unit with the front fuel supply (rice, 1) is used as an example to examine the solid fuel heating boiler’s device. The coolant flows through the input pipe and into the space between the external case and the top-bearing compartment as it naturally circulates along the heating circuit.

In the future, the unit operates according to the following procedure:

  • Fuel through the door of the furnace compartment is loaded onto the grate, after which it is set on fire;
  • With the change in the intensity of opening/closing the damper on the chimney, the amount of air supplied is regulated (and, therefore, the quality of fuel burning);
  • With an increase (as a result of fuel combustion), the temperature in the upper part of the furnace chamber begins the process of heat transfer through the metal walls of the coolant.

By altering its density, the coolant in the heating circuit is allowed to circulate naturally. Natural traction pulls smoke gases out of a chimney, and a solid-fuel boiler’s chimney device can be installed in the wall of the house or left out in the open (this problem is solved even during the building phase).

Rice. 2 A solid fuel boiler for pyrolysis

Angry remnants are manually removed through the ash door and fall into an ash receptacle beneath the grate. The doors have curtains on them so that one can visually monitor the combustion process.

Boilers of this type have the benefit of being completely independent of external conditions; however, they also have the drawback of requiring constant monitoring of the unit’s operation, low efficiency, and periodic ash cleaning.

Conventional boilers work well when used occasionally. For instance, in suburban dachas, residents only live there for a short period of time during the winter.

The principle of operation of pyrolysis solid fuel boilers

The small efficiency of the aggregates of traditional performance is one of their drawbacks, as was already mentioned. By installing a pyrolysis boiler that uses the so-called double combustion principle, the issue can be resolved. It involves the fact that, in the event of a temporary (artificially produced) shortage of air needed for fuel combustion, carbon monoxide—a flammable gas—rather than carbon dioxide—is the byproduct of combustion.

It forms generator gas with steam, which always releases prior to the beginning of steady fuel combustion. This gas supports the combustion process, raises the temperature in the combustion chamber, and lengthens the time that the fuel portion burns. Because firewood and pellets have the least heat-intensive properties of all solid fuels, they are the primary fuels for pyrolysis boilers.

2. The solid fuel boiler design, which applies the pyrolysis principle, is displayed in rice. As a result, this device is composed of two working chambers: the lower chamber is where the actual pyrolysis process takes place, while the upper chamber loads the fuel.

It is divided into the following phases:

  • Preliminary drying of firewood with heated air, forcibly supplied to the camera with a fan;
  • Degasation of firewood, with the release of generator gas;
  • Subsequent burning of generator gas in the combustion chamber;
  • Heating the coolant contained in the gap between the external and internal walls.

It should be mentioned that in a pyrolysis boiler, the combustion period lengthens considerably. This is because the ongoing reactions of degassing and combustion happen at different times. Initially, only the degassing of volatile components, such as oils and resins, takes place at temperatures higher than 2500C. P. Moreover, the process of converting solid carbon to charcoal starts when the temperature rises above 600–6500C (depending on the kind of wood), and the charcoal burns at temperatures as high as 8500C. This results in a more thorough burning of the fuel and longer time intervals between loadings.

3 Long-burning boilers for rice

Despite their high efficiency, pyrolysis boilers have two drawbacks: they need more sophisticated automation equipment because carbon monoxide is a very dangerous gas, and they need electricity to run a fan, which prevents them from being deemed autonomous. This is related to the chimney’s more elaborate arrangement.

The principle of action of prolonged burning boilers

Up to 6 or 8 hours of increased download intervals are possible with pyrolysis boilers, but occasionally this is insufficient. Long-burning units are designed with the original "reverse" principle, which states that fuel burns from the bottom up rather than the top, for a more noticeable increase in the length of a solid fuel boiler’s continuous operation. The unit’s efficiency is noticeably rising. The rice.3 displays a long-burning solid fuel boiler device.

Ensuring that only the portion of fuel that is on the surface can burn is the foundation of the prolonged combustion unit’s operation principle.

The steps involved are as follows:

  • A portion of firewood is loaded through the door in the lower part of the case, the inciting of which occurs on top;
  • The built -in thermal regulator controls the combustion process of each layers;
  • A funnel -shaped air distributor, constantly moving down (as the next layer burns), ensures the supply of air to each next layer.

The air distributor’s speed will be the only factor in maintaining the specified coolant temperature if you have pre-programmed the control automation to operate at that level. The time between firewood layouts in prolonged combustion boilers can therefore be adjusted within very wide bounds, ranging from three to six days.

With the exception of a unique damper intended to change the combustion mode for coal and firewood, all other parts of the boiler for prolonged combustion are essentially the same as the ones found in regular boilers. These units are higher while at the same time not requiring any unique chimney design specifications.

Long-burning boilers require an electrical connection to operate, just like the earlier models of equipment.

How to make a boiler for a long burning

Due to the sharply cold and sufficiently severe climate, people must consider proper and dependable winter preparation every year. If housing and communal services are responsible for providing central heating for all residents of high-rise buildings, then those who wish to retire to a house on Earth will not have anyone to take care of them. Selecting a warming apparatus is the primary step in getting ready for a chilly winter. There is a lot of choice these days. Making a decision will be aided by the financial aspect of the situation, the availability of a particular kind of combustible material, and the residential structure’s design elements.

Diagram for a gas burner that is universal.

Selecting long-burning boilers is a great option because it allows you to choose different fuel configurations and cost variations. Furthermore, building such a boiler yourself is worthwhile in order to save money. The way a long-burning boiler operates

STRUCTURE RECOMMENDATION RESTRICTIVE COULD: 1. The lintel that must be used to remove the ash; 2. The cooling pipes; 3. The screwing hatch; 5. Control panel; 6. Feed to the system; 4. Loading hatch; 7. Luke is in charge of cleaning; 8. Thermal insulation; 9. Safety valve; 10. Water shirt; and 11. Shiber 12. Exit the system; 13. A water bay and draining crane; 14. A cleaning hatch on the lower hatch; 15. A burner; Supply of fuel; 17. Ash specifically for ash.

Since only hard combustible materials are used to combat it in its firebox, the boiler of prolonged burning can be simply referred to as a solid fuel boiler. Boiling coal, stone coal, or peat should be harvested for fluids.

The extended combustion boiler consists of a sizable cylinder-shaped container that is split into chambers with smoke-exit pipes inside. Its uniqueness gives it value. The main combustion chamber and the entire combustion chamber that is blocked by a solid damper comprise the long burning boiler’s total capacity.

The chosen fuel is inserted into the main combustion chamber through a door carved out of the boiler wall. Gases and soot are formed during combustion, which accumulates hazardous combustion products. They are expelled straight to the street via the chimney from a conventional furnace. However, they are hiding a great deal of untapped energy within themselves. Money flies into the pipe as a result. An extra full combustion chamber is provided for their savings, and it’s situated right above the long-burning boiler’s main firebox.

The untapped thermal energy of gases and soot is used in this chamber.


In prolonged combustion boilers, a continuous damper with a hole in the middle for a pipe that removes combustion products and supplies oxygen needed for combustion separates the main camera from the entire combustion chamber. The pipe has a small hole at the entrance to the main combustion chamber to prevent excessive oxygen from leaking in. This allows the combustion process to slow down without losing power or vitality. With a typical average loading, this method permits the fuel additive no more than twice per day. The pipe then takes on its typical dimensions, with a diameter of roughly 10 cm, and exits the chamber of complete combustion by passing through its cavity.

There is a hole for supplying combustion products from the main chamber to the entire combustion chamber for the ultimate energy return and without residual processing in the plane of the damper that divides the two combustion chambers. Smoke is produced at the pipe’s exit, only containing non-toxic substances.

A solid fuel boiler operates with pressure created and maintained at 1 atm. After leaving the boiler, the coolant—which was primarily made of water—has heated to around 80 ˊ. After passing through the heating system’s whole wiring, the liquid is practically never cooled and returns to its original temperature in about 50 ̊ seconds.

The average operating intensity of a solid fuel boiler is approximately 100 kW. For a long-burning boiler to operate properly and to allow for comfortable loading, the fuel units’ length should not exceed 0.5 meters. Long-burning solid fuel boilers do not achieve mass and half tons.

Benefits of utilizing long-burning boilers: It is evident from the explanation of the working principle that solid fuel boilers offer significant advantages over other comparable equipment. You ought to focus on the key advantages:


  • well distinguishes a solid fuel boiler from a mass of other devices its autonomy in use. That is, the ability to portionly supply air to the combustion source in various portions. In this case, the type of room that needs to be heated does not matter;
  • A set of special devices for control will ensure simplicity in operation, and possible problems will be eliminated in time thanks to the control sensors;
  • the necessary thermal energy is released many times more than the fuel materials are spent. This indicates a high efficiency, namely, over 90 %;
  • A solid fuel boiler is an environmentally friendly device for heating the premises.

Resources and instruments for self-directed design The following combination of supplies and equipment can be used to create a homemade boiler with a long burn:

Fuel boiler installation circuit.

  • A cylindrical through pipe made of thick steel up to a meter long and a diameter of a section of about 30 cm like a large gas cylinder will be used as the main case for the location of the main combustion chamber and a complete combustion chamber;
  • steel pipe less than 0.5 m, about 10 cm in diameter. It will need to be placed in the upper part of the case from the end;
  • To carry out pressure on the fuel material, a limiting steel disk with a hole of 3-4 centimeters and porcum spaces extending from the opening is built into improvised boilers. The hole will serve for a portion of air supply to the combustion chamber. The disk should be made 4 cm less in diameter than the volume of the case;
  • Clean steel made from a sheet round cover for a long burning boiler housing. In the center of the lid, a round hole should be provided, with a diameter of a slightly larger diameter of the pipe;
  • nozzles and taps for connecting the boiler to the heating system;
  • welding machine. All compounds of steel elements are carried out with hot welding.

Directions for building a long-burning boiler on your own

Diagram for a gas generator stove made at home.

Long-burning boilers come in a variety of configurations. The most widely used model should be applied to a thorough examination.

How is a boiler like that made? The listed structural elements must be joined using hot welding in the proper order in order to build a long-burning homemade boiler.

The long-burning boiler’s vertical cylindrical steel body will be placed there. A tiny steel pipe, up to 0.5 m long and 10 cm in diameter, is located in the uppermost portion of it. Position an impeller and a prepared restrictive steel disk with a hole in the middle above the boiler’s body for prolonged combustion. The central hole’s diameter ought to be two centimeters. This hole will be approached by the chimney pipe that descends. Its diameter is roughly six centimeters.

Having a door is essential for fuel laying. To mount it, boil a rectangular hole in the middle third of the boiler housing wall using the welding machine. After that, install the door and make sure the locking mechanism is there.

Since a solid fuel boiler produces waste, the small door is likewise placed in the boiler’s lower third as the first door. This will make clearing the boiler furnace of combustion ash products even easier.

Installing a metal pipeline in the upper chamber (complete combustion) is something you should plan to do. For the best coolant heating, it is preferable to arrange the pipes inside the boiler in a rounded shape. To connect the boiler to the heating system’s wiring, the pipes’ ends must be bred outside the boiler and terminate with threaded joints.

The boiler pipe for the coolant to link the divorce connection to the threaded joints is the last step. Install the tap on the connection to control how many fluids pass through and complete the heating system’s wiring.

Device and features of a homemade boiler of long burning

Any solid-fuel boiler for a summer home’s primary drawback is the fuel, which can be firewood, coal, pellets, etc. D. It is essential to toss frequently. And it is really inconvenient as a result. Fortunately, a long-burning solid fuel boiler is out of the question for many owners of private country homes.

It enables the loading of coal once every five days and firewood once every thirty hours. It is true that the vast majority of wood-burning boilers use an average indicator, but modern solid fuel boilers can burn for exceptionally long. Once a month, they fill them with fuel. Naturally, it is nearly impossible to make them by hand due to their intricate design. However, the owner of a cottage or private home in the country can easily make it with a standard boiler that burns wood for a long time.

In the realm of heating and insulating your home, the solid fuel boiler of long burning stands out as a game-changer. This innovative system offers efficient and cost-effective heating solutions while minimizing environmental impact. By utilizing solid fuel, such as wood pellets or logs, these boilers provide sustained heat over extended periods, reducing the need for constant refueling. Not only does this enhance convenience for homeowners, but it also contributes to significant savings on energy bills. Moreover, the environmentally friendly nature of solid fuel ensures a greener approach to heating, aligning with sustainable living practices. With its reliability, affordability, and eco-conscious design, the solid fuel boiler of long burning emerges as a top choice for those seeking optimal warmth and insulation for their homes.


The simplest drawing shows the following as the solid fuel boiler’s apparatus:

  1. Cylinder. It is also a camera for combustion.
  2. Drill loading door.
  3. Ash door.
  4. Air distributor. It is a large metal circle with a hole in the middle. He presses firewood with his weight and falls down as they burn out.
  5. Air supply pipe. It is attached to the center of the air distributor. According to the drawing, it always goes through the top of the boilers on firewood. At the top there is a damper to regulate air supply.
  6. Chimney.
  7. Heat exchanger. It can be installed on a smoke pipe, or can be made in the form of a water shirt.

As you can see, the design of a typical wood-burning boiler for a heating system is straightforward. But not everything is that easy; there are a lot of little details to consider when building a solid fuel boiler by hand.

Features of the case

The following guidelines need to be adhered to for the cylinder-shaped case to contribute to high efficiency:

  1. The ratio of height to the inner diameter should be from 3: 1 to 5: 1. In this case, the diameter value should fluctuate within 30-80 cm. If a solid fuel boiler has too small inner diameter, then the air will not be able to react with the fuel properly, since it will be quickly excreted through the chimney pipe. The efficiency will fall much. When the boiler on wood will have a very large diameter, the central part of the fuel will burn quickly and the edges slowly. Because of this, a pit will appear in the center, into which the air distributor will sit, and the combustion of firewood will stop.
  2. The wall of the case should be 4-6 mm. This rule concerns in cases where solid -fuel boilers made of structural steel are made. If heat -resistant steel is used for production, then its optimal thickness is 2.5 mm.

Inaccurate wall thickness It will have the following effects:

  • If household boilers on the coal will have too thin wall, then it will quickly pass through it. That is, too much heat will be released through it. As a result, the outgoing gases after passing through the gap between the case and the air distributor will become colder than 400 ° C, and their combustion will be incomplete. Because of this, the walls of the furnace chamber will begin to become covered with a dense carbon on, and a very strong condensation will form on the walls of the chimney;
  • If a solid fuel boiler has too thick walls, then its thermal inertia will increase much. Water in a shirt will begin to boil. The situation will not save even the overlap of the pipe supplying air.

Various drawings and videos indicate that the following materials are ideal for the case’s manufacturing:

  1. Industrial gas cylinder. It has walls with the required thickness. It does not need to be made in the bottom. In addition, the rounded top contributes to the better burning of flue gases. Solid fuel boilers of long burning from the cylinder have a power equal to 12-15 kW.
  2. Pipe with large diameter. In this case, you do not need to bend the metal sheet with your own hands. However, bending metal with a thickness of 4-6 mm at home is almost impossible.

The boiler on wood is typically composed of a 90-cm-tall pipe with a 30-cm diameter.

What should be the air distributor

An air distributor for a solid-fuel boiler should have the following characteristics in order to be effective:

  1. The diameter value is 90% of the internal diameter of the case.
  2. The presence of the ribs from the P-shaped profile (for wide structures) or metal strips that diverge from the center and twisted clockwise (for narrow cases). According to many schemes, it is worth brewing a sprocket with a radius, which is a quarter of the radius of the pipe, and the hole with the radius, which is a third of the radius of the air duct, is welded to the metal strips. The height of the ribs depends on the diameter of the case. If a wood boiler has a diameter equal to 60-80 cm, then The height of the ribs should be 10% of the diameter. For a 15-cm radius of the rib body must have a height equal to 4 cm.
  3. The bottom of the tube supplying air is at the level of the lower points of the ribs.
  4. The thickness of the pancake for cases with a small radius should be large, and for structures with a large radius – small.

The plans and numerous videos suggest that the pancake in a solid heating boiler should be this thick:

  • 6-10 mm if the internal diameter (D) is 30 cm;
  • 6-8 mm, if the boilers of prolonged combustion on the coal will have D, equal to 40 cm;
  • 4-6 mm, if D is 60 cm;
  • 2.4-4 mm, if wood-burning boilers are D = 80 cm;

The closest large of the aforementioned values must be used as the basis for the proportional calculation of the metal thickness for the air distributor for intermediate values D.

Features of the air duct

You must ascertain the element’s height and inner diameter in order to manufacture it by hand. The area of the chimney is used to determine the first indicator. The following is the calculation formula: * ((4s/π)^0.5) * (0.5-0.55) = D. A 175 square meter chimney is required for wood boilers with a radius of 15 cm and a height of 90 cm. The chimney hole has a diameter of 15 cm. The pipe, which has an 8 cm diameter, must be used to make the duct for the device with these dimensions.

The tube that supplies air to the system should have a height that is higher than the boiler’s height when it is supported by firewood. She should stick out 15 cm above the collar in this instance. There may be variations in the collar’s height. The operational clearance between the pipe and the collar determines this. Don’t let the gap get bigger than 2.5 mm. The decor’s work and the number 80 determine the collar’s height. The collar should have a height of 1×80 = 80 mm if a double gap in the calculation equals 2 mm (take a figure divided by 2).

It turns out that the boiler on coal should have an air supply pipe measuring 8 + 15 = 23 cm. It is important to note that wearing the collar as seen in various videos is always recommended. Efficiency is always increased when it’s present. This makes using a solid fuel boiler for home heating more efficient.

Doors and their size

The most basic type of homemade solid fuel boilers have two doors with a layer of sheet asbestos or basalt cardboard in the center. The neck ought to be rectangular and projecting. This allows you to eliminate the gaps that inevitably appear when building a door by hand out of a single sheet of metal. Such gaps are undesirable because, as the video points out, they cause the wood boiler to lose efficiency and function poorly.

For a suburban private home or vacation home, the bottom of the furnace door should be positioned at a height equal to the sum of two-thirds of the hull height. both the pancake’s thickness and the air distributor’s rib height. To the resultant figure, add 3 cm.

The furnace door’s measurements should be as follows:

  1. Height – a third of the height of the case without pancake thickness, the height of the ribs and 2 cm.
  2. Width – a quarter of the length of the circumference of the furnace part. For calculations, the external diameter of the combustion body of the system is taken.

An ash door for fuel heating boilers ought to be installed at the bottom. The execution should be fairly high. This feature should be equivalent to the pancake’s thickness plus the height of the ribs underneath it plus ten to fifteen millimeters. It will be simpler to remove ashes and intact sections with your hands the higher it is.

Water jacket

A wood boiler needs to have a well-discounted water shirt, as the video mentions. This implies that there should always be the same amount of space between her and the heat building. The corner makes it possible to accomplish this outcome. It needs to be welded to the body in the form of a circle, arched with your own hands. Naturally, there are two corners provided by the system: one below and one above.

The following characteristics of the water shirt of a private country home or cottage’s domestic heating apparatus are present:

  1. The inner distance from the case to its wall should be 4-6 cm.
  2. The thickness of the sheet metal can be 2.5 mm. If you want to make a shirt with your own hands more correctly, then you need to consider that 1 mm should be per 1 bart of operational pressure. This is provided that the shirt is not higher than 2 m.

A shirt made of sheet metal is possible, according to the video. so look for a fitting pipe.

Purchasing a long-burning solid fuel boiler is a prudent choice for homeowners looking for cost-effective heating options. These boilers have a number of benefits, such as affordability, environmental friendliness, and dependable operation. Their efficient long-term burning of solid fuels, such as wood or pellets, ensures consistent warmth while consuming less fuel.

The affordability of a long-burning solid fuel boiler is one of its main advantages. Compared to traditional boilers, the initial investment may be higher, but there may be substantial long-term fuel cost savings. These boilers reduce the amount of fuel that needs to be replaced on a regular basis and maximize the heat output from each fuel load, which ultimately results in cost savings for homeowners.

Solid fuel boilers also support the sustainability of the environment. When burning wood or pellets as fuel instead of fossil fuels like oil or gas, less emissions are produced. Modern solid fuel boilers can achieve high levels of efficiency and lower their carbon footprints with appropriate installation and maintenance. They are therefore a more environmentally friendly choice for heating homes, in line with the growing emphasis on eco-friendly activities.

Long-burning solid fuel boilers not only save money but also benefit the environment and provide dependable performance. Even in the chilly winter months, their sophisticated technology and sturdy construction guarantee steady heat production. Because they won’t have to worry about constantly changing temperatures or needing to refuel frequently, homeowners will be more satisfied with their heating system overall.

In conclusion, homeowners wishing to upgrade their insulation and heating systems would be wise to choose a solid fuel boiler with a long burn time. These boilers are an excellent long-term investment because they combine affordability, environmental friendliness, and dependable performance. Through efficient utilization of solid fuels, they offer reliable warmth while lowering energy costs and cutting carbon emissions. Homeowners can take advantage of the advantages of efficient heating while making a positive impact on the environment by choosing and maintaining their boiler properly.

Video on the topic

Solid fuel boiler of long burning Barin 18m

Swag -long burning solid burning boiler device

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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