We make an oven with a water heating boiler
No one doubts that in a Russian bath the greatest comfort is achieved if a wood oven with crackling firewood, a pleasant spirit and a stunning heat from a living fire is installed. The only bad thing is that it takes too much firewood sometimes to melt the bathhouse and enjoy the process of purification. Significantly speed up the heating of the room and the preparation of the bath can help a water heating boiler, which is built directly into the oven. This tandem significantly increases the efficiency of the wood-burning stove and allows you to save time and firewood. The main idea is that the built-in boiler even with small dimensions ensures colossal heat transfer. Now let's talk about how to implement such an improvement in the wood-burning stove using improvised tools in a short time.
Homemade water boiler made of cast iron radiators
Excellent in its qualities and efficiency, the boiler can be produced from ordinary cast iron radiators. As a basis, you can take the radiator M-140.It is easy to find, because in large quantities they are taken to waste when dismantling and demolishing most of the old five-story buildings. The capacity of each section of such radiators is 1.5 liters of water, while the surface area reaches 0.254 square meters. In the collection, when 12 such sections are combined, the volume of liquid in 18 liters is obtained and the total surface area is 3 square meters.m. Not every ready-made boiler, assembled from sheet metal, boasts such parameters with similar dimensions. The performance of such a boiler from the radiator can be quite sufficient for heating a room of up to 100 square meters.m. So for a normal bath is suitable, even the stock will be big enough.
Some modifications are required before using the radiator. First, you should get rid of the cardboard pads between the sections. It is best to replace them with an asbestos cord impregnated with natural linseed oil with an admixture of graphite. So you can protect the gasket from burning at high temperatures.
While the sections are dismantled, they should be washed from the inside with a solution of hydrochloric acid 6% concentration, and after a large amount of water. So they can be cleaned from a large layer of rust and dirt accumulated over many years of operation.
The order of assembling the radiator repeats the disassembly process, only in the opposite direction. To connect sections use nipples equipped with right and left threads of each side. Thus, the sections both from below and from above are simultaneously attracted by scrolling the nipple. As soon as there is a gap of 2 cm between the sections, an asbestos cord with impregnation is wound up and the nipples are finally tightened.
After completing the assembly of the entire radiator and waiting for drying drying oil, it is necessary to check the tightness of joints by applying liquid to the radiator under pressure. This is the only way to protect yourself against possible leaks during operation at considerable furnace temperatures.
The connection of the feed and return pipes is best done diagonally on the radiator. Thus, the water will pass evenly throughout the new boiler. The remaining two holes should be closed with plugs. Pipes are better to take inch. On one side of the radiator there will be a right-hand thread and there will be no connection problems. On the other hand, where the carving is left, it is better to use a nipple and a clutch with a drivetrain.
To place such a homemade boiler should not be in the firebox, where the wood is burning, but in the chimney chambers that are directly behind the chamber of the furnace. Since radiators are used cast iron, they should not be heated by flame, but by hot gases that are diverted from the furnace.
The radiator is better positioned so that the pipes come out of it perpendicular to the floor, and the return flow goes below the floor into the underground space. So you can achieve better natural circulation of water when heated.
When assembling sections, you can experiment to improve the design of the resulting boiler. The result should be something similar to the image shown below. So there are examples of the location of the boiler and how to connect it. Again, do not forget that in the case of cast iron, the boiler should be placed in the chimney.
Installing a boiler for a brick oven
How to properly place the boiler in an oven?
The most efficient version of a water boiler is obtained by using a tube or sheet metal with a thickness of 3.5 to 5 mm as a material. In such an option, it is possible to position the boiler directly in the furnace furnace and thereby ensure maximum efficiency. The figure above shows a variant of the design of the heating water boiler itself and its schematic location in the furnace. When using pipes it is better to give preference to seamless, if there are none at hand, then the existing seam should be welded additionally.
The hot water supply from the boiler to the heating system should be located exclusively at the highest point of the boiler. The location of the input of the return is not regulated, but it is most logical to place it below to improve the circulation of water.
When placing any boiler in the oven, ensure that there is a gap between the outer walls of the boiler and the brickwork of the furnace. This is necessary to compensate for the thermal expansion of the boiler metal.
When welding pipes, be sure to cut the chamfer along the contour of the pipe cut. This makes it possible to fill the entire thickness of the pipe with a welded seam and securely fasten the parts without fear that they will disperse during operation.
When installing the boiler inside the oven, you must adhere to the horizontal level. However, it is possible to deviate somewhat from this rule in order to ensure the maximum height of the outlet point from the boiler.
Installing a furnace with a built-in
The most optimal option for a sauna is a stove, in which, especially at the stage of erection, a specially prepared water boiler is mounted. In this case, the furnace acquires its specific features in terms of design, which greatly increases the efficiency of the entire system and its compactness.
The installation of such a furnace has the highest heat transfer efficiency of
Brick masonry for a boiler with a water boiler is performed as follows:
- A concrete foundation with reinforcement is laid.
- Clay-sand mortar is used for masonry. It is best to soak clay and sand for the night. Clots of clay and sand rubbed. The next day, both components are mixed in the ratio: 1 serving clay for two portions of sand.
- A layer of waterproofing in the form of a roofing material is laid on top of the foundation.
- The layer of the solution is distributed evenly and in level over the waterproofing, after which it is possible to start laying the first layer of bricks.
- The contour of the sump is formed first and the door is installed for it. Further, on top of the laid several layers of masonry there is a grating separating the furnace and ash-tray, in which ash will accumulate.
- When forming the firebox, the size of the water boiler with obligatory clearances between its external walls and brickwork along the perimeter of the furnace is taken into account. On the contour of the first row of bricks in the furnace is formed the edge for the installation of the corner. It is on the corners that the boiler will be fixed. In the side walls of the furnace, there are necessarily openings for the withdrawal of return and feed pipes.
- The walls of the chimney are deduced with the obligatory formation of channels for dispersing excess heat and releasing ash and burning.
- On top, the chimney is laid out. After completion of all work, you can connect the heating system to the boiler and check it in action.
Layout of bricks for a boiler with a water boiler
