Creating an effective heating system for a steam room often requires non-standard solutions, especially when the budget is limited and the desire to get high-quality heat is great. Disc stove for a bath has become a real hit among home craftsmen, and for good reasons: availability of materials, simplicity of design and excellent heat dissipation. Heavy-gauge steel truck or tractor wheel rims are ideal for solid fuel combustion, withstanding extreme thermal loads without burning out.
Unlike thin-walled pipes or sheet metal, which often become deformed during the first intense heating, massive rims ensure the durability of the structure. Heat capacity This material allows you to accumulate energy and gradually release it into the room, creating that same soft and enveloping microclimate that is valued in a Russian bathhouse. However, despite its apparent simplicity, assembly requires strict adherence to welding technology and an understanding of combustion processes.
In this article we will analyze in detail all the stages of creating a heating unit, from choosing suitable disks to installing a chimney. You'll learn what tools you'll need, how to correctly calculate the size of the combustion chamber, and why disk geometry is so important for traction. It is critical to use only steel wheels that are not deeply corroded or cracked, as aluminum alloys or damaged metal may be damaged by heat.
Advantages and disadvantages of the wheel design
The main advantage of such a stove is its phenomenal strength. The steel used for stamping truck disks (for example, from KAMAZ or ZIL) has a wall thickness of up to 10-12 mm, which virtually eliminates the risk of burnout even during daily use. This makes the design practically “immortal” compared to cheap store-bought analogues made of thin metal, which only last a couple of seasons.
In addition, the cylindrical shape of the disk helps create ideal aerodynamics inside the firebox. The swirling streams of hot air manage to transfer maximum heat to the walls before escaping into the chimney. This increases Device efficiency and saves wood. It is also worth noting the aesthetic component: with proper treatment of the seams and painting with heat-resistant compounds, the stove looks brutal and stylish.
However, there is a downside to the coin. The weight of the finished product can reach 100-150 kilograms, which requires capital foundation or reinforced floor. You can’t just put such a colossus on wooden logs - this is a direct threat to fire safety. In addition, the process of welding thick metal requires powerful equipment and skills, since it will be difficult for a beginner to weld a 10 mm joint the first time.
⚠️ Attention: When welding thick-walled disks, strong thermal expansion of the metal occurs. If the structure is not allowed to cool slowly under a layer of slag or in a thermal blanket, the welds may weaken or even break due to internal stresses.
Another nuance is inertia. A disk oven takes a long time to heat up, but also takes a long time to cool down. This is good for maintaining the temperature, but bad if you need to quickly heat the steam room from scratch. Therefore, such structures are often combined with stone backfills or installed in constant combustion mode.
Required materials and tools for assembly
To implement the project, you will need not only desire, but also the right set of tools. The basis of the design is the disks themselves. The best option is considered stamped wheels from heavy-duty equipment with a diameter of 20 inches. They have smooth walls and sufficient side height. You will need at least two, or preferably three, disks: one will go to the firebox, the second to the water tank or heater, and the third to the base.
The key tool is welding machine. An ordinary household inverter may not be enough for high-quality welding of thick metal, so it is advisable to use semi-professional equipment with a current of at least 160-200 Amperes. An angle grinder (grinder) with a set of cutting and grinding wheels for metal is also required. Without it, it will be impossible to prepare the edges for welding.
- 🛠️ Angle grinder with 125 or 230 mm discs for cutting and cleaning.
- 🔥 Welding machine (inverter or semi-automatic) and electrodes with a diameter of 3-4 mm.
- 📏 Tape measure, square and chalk for marking holes for doors and chimney.
- 🧱 Fireclay brick or metal sheet for organizing an ash pit.
Don't forget about the chimney elements. You will need a pipe with a diameter of at least 110 mm, preferably made of stainless steel with a wall thickness of 1 mm. For the firebox door, you can use a finished cast iron product or cut it from a sheet 4-5 mm thick, providing it with a simple locking mechanism. Grate - another important element that can be made from reinforcement with a diameter of 12-16 mm.
Before starting work, thoroughly clean the discs from old paint, oil and dirt. Burning the disc with a blowtorch or over a fire will help remove all organic residues, which during welding will emit toxic smoke and interfere with the formation of a high-quality seam.
Step-by-step instructions: creating a combustion module
Assembly begins with the preparation of the main body. If you use two identical disks, one will become the combustion chamber and the other will become the base or water tank. First, you need to remove the central part of the disk (hub), if it is in the way, or, conversely, weld it tightly, leaving only the outer ring. In the classical scheme, the bottom of the firebox is formed by the lower disk, and it is covered with the upper one.
A hole is cut in the front of the lower disk for storing firewood. The opening dimensions are usually about 20x25 cm, but you can adapt them to suit your needs. Below, at the bottom of the side, a smaller cutout is made for blower and ash pit. It is through this channel that the air necessary for combustion enters and the ash is removed.
☑️ Preparing the combustion module
It is necessary to install grate bars between the base disk and the firebox disk. To do this, stops from a corner or fittings are welded inside the disk at the level of the bottom of the combustion hole, onto which the grate is laid. Gap between bars should be sufficient to spill the ash, but not too large so that small coals do not fall straight into the ash pan. After installing the grate, the lower part (blower) is covered with a metal sheet or a second disk with a cut out bottom.
The upper part of the firebox is closed with a lid. There must be a hole in it for the chimney. It is important to move the chimney outlet closer to the front of the stove (above the door) rather than in the center. This will create a "smoke tooth" effect, causing hot gases to bend around the obstacle and give off more heat before escaping into the chimney.
Organizing the heater and water tank
A disk stove is often made into a combination stove: with an open or closed heater and a tank for heating water. The easiest option is to install the tank directly on the top of the combustion module. For this, a third disk or a piece of large diameter pipe is used, which is hermetically welded to the upper rim of the firebox.
Inside the tank, directly above the firebox, you can organize a compartment for stones. To do this, a smaller diameter pipe is welded inside the tank, passing through the water, or a separate niche is made. Open heater located on top of the structure: the stones are placed in a metal trough or mesh welded to the very top. Water falling on hot stones instantly evaporates, creating steam.
| Parameter | Open heater | Closed heater |
|---|---|---|
| Steam temperature | Less than 100°C (light steam) | Above 100°C (dry heat) |
| Heating rate | Fast | Longer (requires warming up of the mass) |
| Location | On top of the oven | Inside the firebox or in the casing |
| Difficulty | Low | High |
If you are planning to do water tank around the chimney (the “samovar” method), then the chimney pipe must pass through the entire volume of water. This requires perfect tightness of the welds, since water pressure and temperature will create an aggressive environment for any metal defects. The water in such a tank boils very quickly.
The secret of soft steam
To obtain “light” steam, the stones must be periodically sorted, removing crumbled ones, and calcined until red. Use only hard rocks: jadeite, gabbro-diabase or quartzite. Granite and soft cobblestones will crack and release dust.
Chimney installation and safety issues
The safety of a bathhouse with a solid fuel stove directly depends on the quality of the chimney. Since the disk furnace is red hot, the temperature of the exhaust gases can be critically high. Therefore, the first section of the pipe (to a height of 1-1.5 meters from the furnace) should be made of stainless heat-resistant steel thickness of at least 1 mm. The use of asbestos or plastic pipes in this area is strictly prohibited.
The chimney passage through the ceiling and roof must be equipped with a cutting box filled with non-flammable insulation (expanded clay, basalt wool). The distance from the pipe to wooden structures must be at least 38 cm (according to standards) or be protected by stainless steel screens with an air gap.
⚠️ Attention: Never use foam, polystyrene foam or other melting materials to insulate the chimney. In case of fire, they release toxic substances and do not protect the tree from ignition.
To adjust the draft in the chimney, it is necessary to install gate (valve). It allows you to retain heat in the stove after the wood burns out, blocking the exit of hot air. However, the damper can be completely closed only after the coals have completely burned out to avoid carbon monoxide poisoning.
A high-quality chimney with good draft is not just about removing smoke, it is a guarantee that carbon monoxide will not enter the room, and the heat will be effectively used to heat stones and water.
Maintenance and Operation
A disc stove requires minimal but regular maintenance. Before each season, it is necessary to inspect welds for microcracks. Metal that is constantly subjected to cycles of heating and cooling can become "tired." If you notice a through hole or crack, it must be welded immediately, after cleaning the edges.
Once a year it is recommended to completely clean the firebox and chimney of soot. Soot is an excellent heat insulator that prevents heating of the furnace walls, and at the same time it is a flammable substance that can flare up in the chimney. For cleaning, use special chemicals or mechanical brushes.
- 🔥 Conduct a visual inspection of the housing for deformations after winter downtime.
- 🧹 Clean the ash pan after each fire to ensure better traction.
- 🔨 Check the tightness of the door; if it does not close tightly, replace the seal or bend the hinges.
The outer surface of the oven can be coated with heat-resistant black paint (for example, silicone based). This will not only improve the appearance by hiding welding marks, but will also protect the metal from corrosion, which develops very quickly in a bathhouse. Oxidation surface is also a good way to protect.
Is it possible to use a disk stove in a wooden sauna without a foundation?
No, you can't. The structure of several disks weighs a lot, plus the weight of stones and water. The pressure on the fulcrum will be colossal. Either a separate concrete foundation or a reinforced brick/block platform supported by reinforced floor joists is required.
What disc diameter is optimal for a steam room with a volume of 15 m³?
For such a volume, disks with a diameter of 20-22 inches (from KAMAZ or MTZ tractor) are suitable. The height of the firebox must be at least 40-50 cm (you can weld two disks on top of each other) to ensure complete combustion of the fuel.
Is it necessary to line the inside of the firebox with fireclay bricks?
In the case of thick disks (8-10 mm), lining is not necessary, since the metal itself holds heat well. However, if you want to extend the life of the metal and make the stove even more heat-intensive, laying bricks on edge inside the firebox would be an excellent solution.