Where can you use a gas oven
The gas heating system is universal, it is used:
- for heating baths and saunas;
- as heating boilers when laying thermal communications in a room;
- as part of boiler structures to provide apartments with hot water in the summer;
- if we consider household gas stoves, then they are very popular with housewives. Thanks to the open fire, dishes are cooked on such a structure much faster.
Types and features of gas ovens
Before you build a gas oven for a bath with your own hands, you need to understand the main design features of these structures and their types.
All gas structures are classified:
- heating;
- household;
- heating.
If we consider a stove for a bath or sauna, then it is worth stopping at a heating gas structure.
Heating stoves are used in autonomous heating systems and hot water supply of private buildings. It should be borne in mind that with high air humidity, these structures are practically useless, since they cannot maintain a high temperature.
Gas household structures are ovens for cooking, which are often installed in summer cottages. They are unpretentious in care and easy to use, in addition, they are quite economical.
Gas ovens have various qualifications for:
- the type of burner that is installed in the boiler;
- the method of heating the coolant;
- the material for the manufacture of the furnace frame;
- the type of fuel to be used.
There are many types of gas furnaces, there is another type of qualification - according to the type of gas burner:
- atmospheric;
- supercharged.
The most affordable burners on the market are atmospheric burners. They are easy to install - no need to supply electricity and install special automation. In this case, injection is involved, under the influence of which air enters the zone chamber or a special pipe installed by analogy with homemade structures.
It should be understood that this is why the efficiency of the furnace will depend on the supply of oxygen. If the blowing is weak, then the efficiency of the furnace will also greatly decrease - the combustion of the gas will be sluggish.
The most complex and expensive design is inflatable burners, which directly depend on electricity. The design feature of this unit is a special fan that blows air into the combustion chamber. The efficiency of the structures is great, its use is universal, since they can be installed in combined-type furnaces. Atmospheric units can only be installed in gas ovens.
The body material can be different:
- a rock;
- brick;
- metal.
Each material has both positive characteristics and disadvantages.
Baths, saunas and pools
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Natural gas can be called the most inexpensive fuel. And thanks to this economy, gas ovens are becoming more and more popular, including when used in baths. Gas powered devices are very compact and easy to maintain. Today we will look at how to make a gas oven for a bath with our own hands and what is needed for this.
- Preparatory work
Features of gas ovens
Today, a gas stove can seriously compete with a wood stove. It is much cleaner, easier and cheaper to use. She can warm up the steamy air quite quickly: in the summer in three to four hours, and in the winter a little longer. It takes about eight hours for the bath to warm up well. But high-quality heating provides comfort, warmth and coziness.
One of the main advantages of a gas bath, as we have already said, is economy. This fuel is the cheapest and most economical, so you can save a good amount. Wood and electric stoves will cost three times more! The gas oven does not require special attention to you. Combustible waste is very small, so the heating box and chimney ducts are practically not contaminated.
There are rules for installing a gas boiler in a bath, which are very strict, but they ensure high safety of use. The service life is approximately twenty-five years, and if you regularly carry out preventive maintenance, the oven will work for a long time and will not break down. If you do not take into account the overly strict safety rules, the disadvantages include only the mandatory presence of a centralized gas pipeline.
Gas furnace design
The device of gas stoves is similar to wood-burning ones, but it has some differences in fuel properties. The gas stove has a body, a fuse (to stop the fuel supply in case of damping), a thermostat, a sealed gas chamber, and a chimney. The difference lies in the fact that the fuel supply is carried out through the laid gas main.
Gas cylinders are placed in a special container in accordance with all safety regulations. As practice shows, a five-cubic meter gas canister can heat a room up to two hundred square meters during one heating season. It is worth noting that propane has a higher heat supply capacity when compared to natural gas. Such stoves can have different power, the calculation of which depends on the volume of the bath.
You should know that there are 252 kilocalories of heat per 0.4 cubic meters. Therefore, you can easily calculate how much gas you need. Gas bath stoves do not require periodic heating, so they should be turned off during use. Such furnaces work according to a very simple principle - air is mixed with gas even before it enters the firebox. A separate part of the air flows into the firebox.
You can adjust the amount of air supplied to the gas sauna oven using the lower door, which also allows you to clean the burner. Using a special flexible hose, gas is supplied to the burner (or a cylinder is used).
Classification of gas ovens
There are many different modifications of the gas oven. You must determine for yourself what kind of bath you want and, based on this, make a decision. The best option is a brick oven with an inflatable burner. A simpler option is a brick-faced metal stove. Gas boilers are divided by purpose - they can be heating, heating and domestic. As a rule, heating furnaces are used in baths, which differ in material, water heating technology and type of burner.
Materials for a gas bath stove
Homemade gas stoves for baths can be built from stone, metal or brick. Stone and brick take longer to melt than metal, but they also keep warm for a long time. But metal gas ovens heat up very quickly, but also cool down quickly. It should be noted that metal ovens are the most compact ones. They are very easy to install and use. If a metal stove is faced with a brick, it will not look different from a brick one.
Gas-burners
There are two types of gas burners: atmospheric and inflatable.Atmospheric burners are the simplest and cheapest. Their work does not require an automation system and sophisticated equipment. Gas combustion is supported by air, which enters the combustion chamber through a blower or ash door. The efficiency of work depends on the amount of air inside the bath, so a small amount of oxygen can lead to problems. There are also inflatable burners, but such equipment is more complex.
The design of such burners depends on a fan that blows air from the outside and depends on the electric current. The price of gas stoves for a bath with inflatable burners will eventually turn out to be the highest, since this option is more expensive in terms of electricity consumption, but also more efficient. It is often used in so-called combined stoves, which can be fired not only with gas, but also with other fuels, for example, wood.
Water heating methods
There are gas ovens with an already built-in water tank and a remote version. The first option is more convenient, since the water is heated by the combustion products of the fuel. The chimney must be installed so that it can pass through the heated volume of water. Heating the tank also generates heat, which comes from the heater. This option allows you not to clutter up the bath with unnecessary appliances.
As for a gas oven with a portable tank, it is usually located on a nearby wall or in another room. The two elements are connected by a system of pipes through which hot water flows, which heats up inside the furnace.
Do-it-yourself gas stove for baths
Please note that a permit is required to install a gas oven in a bath. A brick oven can create the best combination of humidity and temperature. It may seem that such an option is very difficult to establish, but with diligence and adherence to all construction technologies, any good owner can cope with this task.
Preparatory work
First you need to design everything and choose the most suitable place. As a rule, the stove is placed near a partition or wall, since it must heat the steam room and maintain the optimal temperature in the rest room. The main elements of a home-made gas oven: base, chimney (insulated with mineral wool), heater, burner, sheet of fire-resistant material, pad, control unit.
When creating a furnace, you can use the leftover materials that were not needed in the construction of the bath, but it is better to buy new ones. We recommend that you do not skimp on quality, because a good oven will provide you with its reliability and durability. In the process of work, you will need the following materials and products: red fired brick, clay, galvanized sheet metal, reinforcing bar, metal pipe, grate, sand, blower doors, asbestos-cement pipe, firebox doors, water and gas pipe and steel sheet.
Before you make a gas stove for a bath, you need to build a foundation. Its construction begins with a pit, the bottom of which should be located below the freezing of the ground, which takes about seventy centimeters. At the very bottom, its width should be slightly larger than the main notch. This technique will help to avoid unnecessary trouble in case of ground movements. The bottom of the pit must be covered with sand fifteen centimeters thick. The sand is filled with water, soaked and covered with a stone with broken bricks about twenty centimeters deep.
After that, crushed stone is applied, formwork is made and a reinforced frame is installed. Next, it is necessary to pour concrete, after setting which the formwork is disassembled, and the surface is covered with tar in several layers. The place that has been freed from the boards can be covered with fine gravel with coarse sand.Be sure to install a moisture barrier on the top of the foundation.
Furnace wall arrangement
After arranging the foundation, you can start installing the walls. To begin with, a protective wall is made, which can protect the bath from possible ignition. It is made of cut bricks, which are held together with cement mortar. For a brick bath, it is better to use a sand-clay mortar. As a rule, clay is taken at a depth of at least half a meter of the earth.
It is poured with water in a special container for a day and mixed thoroughly. The sand must be cleaned of debris and sieved. After that, sand and clay are mixed in a 1: 1 ratio, then mixed again with the addition of water. When the solution takes on an absolutely even consistency without lumps, you can begin construction. It is better to prepare the solution in small batches, as it is consumed.
The very first brickwork plays a very important role. A waterproofing gasket made of bitumen is preliminarily placed on the foundation, on which the first layer is placed. All bricks are wetted with water, ideally place the brick in water and wait about ten minutes. When the brick is laid on the mortar, it should be held back a little with a construction pickaxe.
Check carefully that the bricks fit snugly together and that the seams are no thicker than five millimeters. The second and next rows are laid in such a way that each brick subsequently overlaps the joint of 2 bricks of the lower row. Before laying bricks in mortar, builders recommend laying them dry so that you can see the full picture.
Each stage of construction must be coordinated with the drawings of a gas oven for a bath. During the laying of the third row, it is necessary to build in a blower door, which is secured with galvanized wire or cut strips of steel sheet. In the fourth row there is a well for ash and grate. For its reliable placement, it is necessary to make indentations and leave room for its expansion (one centimeter is enough).
Fittings installation
The sixth row should complete the installation of the blower door, and the seventh should complete the placement of the grate and the firebox door. The most durable are cast-iron doors. In the eighth row, a partition is mounted - the beginning of the chimney. Bricks are stacked up to the fourteenth row, on which the channels are placed.
Make an opening in the front wall for a container in which water will be heated and which is installed on the channels. The sidewalls hold the container vertically. The fifteenth row is laid from halves of bricks and placed at an angle. The halves will be the basis for laying the dividing wall. In the same way, the next three rows are laid, as well as the first.
At the nineteenth row, you can install a steam outlet. Thin mild steel strips are placed between the twentieth and twenty-first rows, after which a hot water container is placed, which is surrounded by fragments of bricks. A chimney is installed from the twenty-third row, which is selected based on the modification of the furnace. The pipe above the roof must rise at a distance of at least half a meter.
A massive gas boiler for a bath should have a large and heavy pipe, and a small one - light. Remember that the pipe must be at least half a brick thick. The smoke passage must be of the same dimensions. Here it is better to use a solution of lime or cement. The clay composition can wash away the rain, leading to destruction.
Final work
After completing all work, the oven must be plastered. This procedure will improve the appearance and serve as additional protection against fire. Plaster can be made from any solution by adding alabaster to it. You can use plaster as well, but keep in mind that it hardens very quickly. An excellent option for plaster is clay, gypsum and sand mixed together (gypsum can be excluded).
Before plastering, it is necessary to prepare the wall of the stove. It is cleaned from the frozen solution to one centimeter. After that, it is better to putty. If you are going to heat the bath with liquefied gas, the cylinder should be placed outside. Many bath owners bury gas cylinders a few meters from their location. Let us remind you that liquefied gas has a higher heating value.
If you are assembling a gas boiler for a bath with your own hands, it is better to give preference to the SABK-8-50S automation system. This system perfectly maintains the set temperature and is familiar to all craftsmen. It is also as safe as possible - due to four levels of automatic protection.
This automation tends to turn off the heating equipment in emergency situations: when the flame goes out, if the gas pressure drops below the set point, or if the impulse automation system is depressurized. Such an oven is erected from eight to ten days and dried within two weeks. After that, you can start to melt it gradually, but you should not immediately bring it to a strong warming up.
Security questions
To correctly make a stove for a bath, you should study the instructions for a gas oven for a bath and strictly follow them. As you know, a gas boiler is an explosive structure. To reduce the risk of fire, it is recommended to adhere to the following rules:
- The stove must be at least half a meter away from structures that can catch fire. This distance can be reduced by installing a protective barrier made of refractory material (eg iron). If the wall next to the stove is made of a fire hazardous material, a special screen should be installed opposite the door, which has a size of two furnace openings.
- When installing the stove and chimney, a stainless steel pipe must be used. Pipes must not be pulled through living quarters. The chimney must be up to five meters from the level of the burner. Do not forget to tightly connect the chimney to the stove.
- The burner opening must have the following dimensions: height from 470 to 550 millimeters, width from 350 to 450 millimeters.
- The chimney must be carefully insulated against heat loss. This is done where it goes through the roof and ceiling. The chimney is also insulated.
- The refractory base, which is located under the stove, should protrude one hundred millimeters from the edges of the appliance.
- The height of the room must be at least two hundred and twenty centimeters. It must have exhaust ventilation and a window with a vent. All doors should only open outward.
- The gas pipeline, according to the scheme of a gas oven for a bath, is made of copper or steel.
- Flexible joints must be solid, pressure and temperature resistant, labeled "gas" and have a diameter of ten millimeters.
- If a centralized gas supply is not foreseen, a discharge of combustible products into the atmosphere should be installed.
- A metal sheet with a heat-insulating layer below is laid on the floor in front of the oven.
The gas stove is perfect for baths and saunas. Today this option is the most convenient and economical. If you decide to make a gas boiler for a bath with your own hands, you should take safety rules seriously and obtain permission from the relevant authorities. Subject to all construction technologies and the corresponding operating rules, your furnace will serve for a very long time and without interruption.
Brick and stone ovens
These designs differ in the duration of warm-up. If there is a desire to take a steam bath during the day, then you will have to start heating the bath at night or early in the morning. Of course, such a stove cools down much longer, for example, a well-heated bath, even in winter, retains heat for 2 days if there is a brick structure in it.
Brick structures must be installed on the foundation, since they have a decent specific gravity, differ little from the classic version of sauna stoves. The only difference is that the door will open access not to the firebox, but to the heater, which is located in the stove itself.
It is worth noting that the cost of a brick oven will be quite expensive, since a lot of material is needed for its installation.
As for metal gas stoves, they are much more popular with ordinary people, their advantages:
- Easy to install.
- The ability to build on your own, without the help of a professional bricklayer.
- The design has a low specific weight.
- Heats up quickly, thus it takes much less time to heat the room.
- Profitability, especially if you assemble the structure yourself.
Sauna stoves are divided into types according to the type of fuel:
- exclusively on gas;
- combined.
If everything is clear with the former, then the latter should be considered in more detail, since they are heated both on gas and wood. This versatility has significant drawbacks:
- bulkiness of the structure;
- it is imperative to install a blower burner;
- the complexity of execution;
- dependence on electricity;
- traditional wood stoves are much safer.
As for gas stoves, they can be equipped without having a gas pipeline nearby, since they perfectly function on propane, which is freely available and is sold in metal cylinders.
In addition, propane compares favorably with natural gas, the thermal energy during its combustion is much more efficient. This gas is economical when heating a small room in a bathhouse; you often don't have to fill up the cylinders.
But there is also a significant disadvantage - the need to equip a special room for the installation of gas cylinders, which should be at a sufficient distance from the building, outside of it. It is advisable to prepare a steel container dug into the ground.
Materials for a gas bath stove
By materials of manufacture:
- Cast iron.
- Steel.
- Brick.
https://www.youtube.com/video/bdiYCEHGPaM
Cast iron structures are not available for independent reproduction, since they are cast on industrial equipment.
Steel ovens are compact and lightweight. They do not require a massive foundation. The thickness of the metal is about 5 mm. Their walls can get very hot, so usually a protective "casing", for example, made of bricks, is erected on several sides of the stove. A bath, equipped with a metal stove, heats up in 2 - 3 hours.
A hybrid of a brick oven and a gas burner can also be built by hand. Such a unit will take longer to melt, but it also retains heat in the room for longer.
When deciding whether to build a brick oven, you need to consider:
- There are metal structures inside the array, so welding cannot be avoided.
- Brickwork is a time consuming and time consuming process that requires special skills.
- The construction will require more space.
- As a basis, you will need a concrete slab that is not connected to the bath's foundation.
- You need to heat a brick stove 5 - 6 hours before the start of the bath procedures.
- The heat from a brick oven is softer, the masonry does not heat up and does not pose a threat to people and the walls of the building.
Some craftsmen even manage to remake a finished brick wood stove by cutting a burner into it. But it must be remembered that a brick is a heat accumulator that is not able to so quickly absorb the amount of heat that the burner gives.
Brick oven
Therefore, massive stoves (Russian) and bell-type stoves are not suitable for alteration. You can gasify a Swede, a Dutch woman and other models with several wells.
The main disadvantage of metal sauna stoves is that they cool down quickly. Therefore, the owners of solid fuel stoves are forced to constantly "throw up" fuel during the bath procedures.
For gas ovens, this is not a problem.They simply remain "on" all the time while people are in the bath.
How gas ovens work
To have an idea of \ u200b \ u200bthe device of a gas oven, consider the main structural elements:
- a housing that is made of metal or other material that protects the internal contents;
- a fuse, which is installed in case there is an attenuation in the furnace - the gas is shut off instantly and automatically;
- thermostat responsible for temperature;
- sealed chamber. It is on this unit that you should pay special attention when choosing a design in a store or making a gas oven yourself. The safety of people living in the house depends on the integrity and reliability of the camera;
- the chimney serves to remove combustion products from the bath room.
As for the principle of operation, it is quite simple. The gas burner, to which the gas is supplied, is located inside the housing. There is a heater and a chimney on the body. As soon as the burner is triggered, the combustion process begins in the working chamber, from which the furnace body and stones are heated, and the waste products come out through the chimney.
We must not forget about the water tank, in which it will be heated from burning in the oven. It can be installed above the stove and attached to a pipe, which, when heated, will give off heat to the liquid. But some craftsmen build a tank attached to one of the walls of the furnace.
In addition to all of the above, for gas stoves for a bath, you need to build a protective case, which is built on top of the main one, in places where the stove is close to the walls of the bath.
Pros and cons
Today, gas fuel is chosen by many inhabitants, if there is such an opportunity in the region, since it is considered the most economical fuel. It should also be noted that gas-fired ovens have many advantages:
- The design is simple when compared with solid fuel stoves, for example, in gas stoves for a bath, there are no huge furnaces and ash pans - they are not necessary.
- Ease of operation of the gas unit. The wood stove must be constantly monitored and fuel must be added as it burns. As for the gas boiler, it is enough to set the basic parameters: the rate of fuel flow, temperature regime, pressure and automation will monitor all this. It should be noted right away that when building a structure on your own, you should not save on automation - gas requires a responsible attitude.
- There is no need to constantly clean the gas structure - there are no ash residues and solid waste.
Gas ovens have drawbacks, but there are few of them:
- registration of documents and permits for the installation of gas equipment - one-time, but there are some difficulties;
- sometimes there are difficulties in winter with high fuel consumption;
- in some areas, the pressure in the system may drop, but this is quickly eliminated.
Principle of operation
The walls of the fuel cell are heated by the combustion of the fuel. Air, to maintain the combustion process, is supplied through the blower.
A chimney is located at the top of the heater (combustion products come out through it), it joins the firebox.
Water circuits are rarely connected to gas stoves. The room is heated directly - with heated air from the stove. The only difference with a solid fuel stove is that it uses natural gas, not firewood.
There are options for gas stoves, combined with a solid fuel unit, or powered by electricity. There are universal burners that run on diesel fuel, if the need arises.
How to make a gas oven with your own hands
If you decide to create a gas oven with your own hands, then it will not be difficult. The main thing is to determine the sequence of the work and know the main nuances, which we will consider further,
Do not be afraid of complex schemes that can often be found on the Internet, if you understand how to deal with a drawing, then there will be no problems.
Preparation
First of all, we create a project on paper. The pipeline will be marked on it, which will go to the bath. You should not do this yourself, as it is very likely that you will make mistakes. Contact a special service, which has specialists - they will not only make a detailed project, but also lay communications to the place of installation of the furnace.
In addition, you will have to go through the approval procedure with the management of the gas service and obtain permission from the fire service.
But these actions need to be performed only if the furnace will operate from a gas main. Completely different spare parts must be installed on LPG equipment, since the fuel will come from the cylinders.
When drawing up a project, you need to develop a good ventilation system that looks like a chimney. This work must also be entrusted to professionals, since with poor ventilation of the room, there is a possibility of carbon monoxide poisoning if a heating failure occurs. Before inviting specialists, it is worth preparing all the permissive documentation - employees have the right to refuse installation if there is no agreement.
Installing a gas oven
Before starting the installation of furnace equipment, you need to prepare a reliable and heat-protected base:
- an asbestos sheet is laid on the floor where the structure is supposed to be installed;
- then it is covered with a piece of sheet iron and screwed tightly to the boards. If the floor in the bathhouse is made of concrete, then it is not necessary to carry out these manipulations;
- further, the nearby walls are protected, which are also sheathed with asbestos and iron. Even if the equipment is installed at a considerable distance, it is worth making sure - the heat negatively affects the material of the walls;
- now on sale there are special screens that can provide additional protection not only to walls. Experts advise to install them around the stove from the side of the steam room - they will prevent those present in the bath from touching the hot surface.
Further, the installation is carried out in accordance with the gas supply system and the presence of curtain walls in the bath. In the case of installing a furnace that will operate from a gas main, it is worth buying a special metal hose connected to the inlet pipe. The distance is calculated in advance - it is important that there is no strong tension when laying it to the installation site of the furnace equipment. Passages are arranged in the walls and partitions, which subsequently need to be well insulated so as not to drown the street in winter.
Important! It is undesirable to use a rubber hose for the connection, since it is unsafe, and it lasts for a short time. It is better not to spare money and buy an element made of heat-resistant and moisture-resistant material. In addition, modern hoses for connecting gas equipment are easy to use and reliable.
If you decide to install balloon equipment with liquefied gas, then it is worth preparing a special room that will be located at a decent distance from the bath structure, protected from direct sunlight and summer heat. You can go in two ways - build a special shed, the walls of which will be additionally insulated with foam or mineral wool.
Dig a pit, the walls of which can be upholstered with a board so that they do not crumble, pour concrete. After installing the cylinders in this recess, they construct an insulated cover, which can subsequently be sprinkled with earth.
Next comes the assembly and connection of the gas oven.The installation of the structure must be carried out strictly according to the instructions, since different manufacturers have their own specific nuances during assembly - different fasteners and installation method. But there are rules that apply to all models without exception:
- the minimum distance between the wall and the stove is 30 cm. If the walls are prepared and protected with refractory material - 15 cm;
- the chimney is discharged through the assembly on the ceiling and roof;
- nail a sheet of metal to the floor in front of the firebox - sparks can fly out of it.
If the model of a gas stove provides for the installation of a water tank on a pipe, then you can adjust it in height so that it is convenient for all family members to use it.
As soon as the furnace is installed in a permanent place, they start assembling the control system, if it is not built into the structure. In this case, it is tedious to strictly follow the manual that usually comes with the oven.
Today there are many models in which an auto-ignition is provided, it does not work without electricity, therefore, before assembling the structure, a separate cable is pulled into the bath, protecting it with a special corrugation from high temperatures.
If there is no built-in fan, then before each ignition it is necessary to check the draft in the structure - for this, a match is lit and brought to the furnace window.
If there is a gas stove in the bath, then the room will be completely warmed up in winter to the desired temperature after 8 hours. This is not an accurate indicator, everything will depend on the power of the structure, the quality of insulation of the walls, ceiling and floor.
If external temperature sensors are installed, the oven will turn off automatically.
disadvantages
Gas ovens are not without their drawbacks. The equipment itself and its installation are not cheap at all. Natural gas is the most inexpensive fuel, but its cost in our country is systematically increasing.
Gas ovens are difficult to install and connect. In the event of even the smallest error, you can face huge problems in the use of such devices (they either will not do what they are intended for, or they will begin to pose a danger to the life and health of residents).
Making a stove for a bath with your own hands: instructions
Necessary materials:
- gas burner, atmospheric;
- a gas cylinder that has already worked out;
- metal door for the combustion chamber;
- a used brake disc from a large car - for a heater;
- gas pipe with a cross section of 50 mm - for gas supply;
- pipe 100 mm - for the chimney.
Manufacturing:
- Cut off the gas cylinder with a grinder according to the drawing.
- Drill 2 holes for gas and air supply with a bit.
- Form round parts for the baffles that divide the cylinder into work areas.
- Weld the structure by inserting the blanks into the places where it will be located: a firebox, a blower and a heater.
Important! If the water container is on top, then it is worth welding the pipe to remove the smoke.
A blowing must be made from a pipe with a cross section of 50 mm. To do this, make several holes with a cross section of 5 mm, weld a piece of pipe to the main cylinder - in the place where the blower will be located.
Then, in the same order, install the gas supply pipe, which should be opposite the firebox, where the burner will stand.
At this stage, the manufacture of a gas stove can be considered complete, all that remains is to install the internal equipment.
Design
The gas oven consists of a body, a fuse, which is necessary to stop the gas supply in case of attenuation, a sealed gas chamber, a thermostat and a chimney. Gas baths do not need to be periodically warmed up, so they can be turned off immediately after
use. The principle of operation of the stove is simple - the gas is mixed with air before it enters the firebox. Gas is supplied to the burner using special gas pipes.
Homemade gas muffle furnace
This rather large gas furnace is designed for long-term annealing of something (for example, flasks before casting metal), firing ceramics, etc. The lining materials used allow the temperature to be brought up to 1200 degrees. For this temperature it is necessary to exclude the use of metals inside the furnace, even stainless steel. Because at these temperatures it will float. It is already necessary to use ceramic platforms on ceramic racks. But for my needs, 750 degrees are enough, so I refused to use ceramics on the racks, and used a bookcase welded from nigella, suspended on iron brackets. The shelves on the shelf can be rearranged to fit the dimensions of the cage. Of course, a shelf made of nigella will corrode, but you can extend its life by smearing chalk on liquid glass, and then weld a new one.