specialist store. The indirect heater is arranged so that it can operate from a heating system. To make the device yourself, you need a calculation. It will also require an old gas cylinder, which will serve as a system tank and copper pipes that act as coils.
- Advantages and disadvantages of the indirect heating tank
- How does the indirect heating boiler
- Elements of the boiler construction
- Drawings and calculation of the indirect heater boiler
- Boiler body from the gas cylinder with your own hands
- CoilFor a boiler with their own hands
- Indirect heated heater boiler( video)
Advantages and disadvantages of an indirect heating tank
The system does not feedElectricity, and works from the heating system. With the right design, the water heater has a high capacity at minimal cost. To pluses also carry durability of the device due to isolation of the device from running water. In this case there is always hot water in the side, just tap the tap. The boiler can be operated from a boiler or central heating, sources can be changed.
Minuses of the indirect system:
- Conversion of the system requires financial investments;
- The indirect heating device is more expensive than a gas or electric boiler;
- The first heating may take several hours, which may damage the heating system;
- With large system volumes, the design takes up a lot of space.
When buying a boiler for a start, pay attention to its size. Further take into account the material of the inner tank. It is he who determines the quality and durability of the device. It is best when the inner walls are made of stainless steel.
How the indirect heating boiler
works The indirect heating boiler is mounted next to the boiler and connected in parallel to the main distribution and heating devices. This connection provides the appliance with a sufficient amount of heat carrier for heating the water. At the same time, the cost of spreading the temperature when the water heater is switched on is reduced.
Indirect equipment schematic:
- Capacity of steel with thermal insulation;
- Thermal insulation;
- Pipe for water circulation;
- Holes for cleaning and inspection;
- Heat exchanger made of copper;
When the temperature in the tank decreases, a signal is sent to start the circulation pump. The heat transfer medium passes through the coil and is divided by heat with a cold liquid. After heating the water, the coolant goes back. It is important to isolate the external housing well. Then the heat loss through the walls will be negligible.
If you open the tap on the mixer, the cold water starts to dilute hot. The temperature in the system drops, and the heating cycle repeats.
instruction. The system provides installation of a non-return valve for the supply of cold tap water. It does not allow it to flow together when the feed is cut off. The heated water expands. If the flow valve is closed, the non-return valve prevents the flow of cold liquid, then the pressure in the system increases. To ensure that these values are within the normal range, a safety lever is mounted between the tank and the non-return valve. He takes some of the water into the sewer.
Elements of the
boiler construction The indirect heating boiler provides a large thermos. In the tank there is a heating element - heating element. In addition, the design includes a number of other important details.
Water heater unit:
- External housing with fixing parts;
- Thermal insulation;
- Thermostat or thermoelectric sensor;
- Security Team;
- Air outlets;
- heating element;
- Magnesium anode;
- Input and output pipes.
Some elements include a recirculation loop. In combined models a tubular electric heater with strapping is equipped. The price policy of boilers may vary. Much depends on the material of manufacture, method, design and additional functions.
For external enclosure I use steel sheet or strong plastic. If the boiler is installed on the floor, the structure provides special legs. To fix the device on the wall, you need brackets. The space between the tank and the body is filled with polyurethane foam, which acts as a heater. The external housing is equipped with a thermometer to control the heating of water.
The internal tank must be resistant to corrosion. With this task stainless steel does an excellent job, but it is an expensive material. A lot of pluses have a design with an anti-corrosion glass-porcelain coating.
When using an enamel for the inner tank, the appliance will not last for a long time.
The heat exchanger has the appearance of a coil, which is made of steel or brass. The heat exchanger can be located throughout the entire tank circuit or just below. Some boilers are equipped with two coils. One is connected to the boiler, and the other to the pump or manifold.
Magnesium anode protects internal elements of the boiler. The device operates on the replacement of electrons that participate in ion exchange. So the corrosion process stops and the parts last longer. But the anode itself needs periodic replacement.
The water inlet and outlet pipes are at the bottom and top respectively, so that the liquid does not mix. Horizontal systems can have a pipe connection on the right or on the left. The safety group includes a safety valve, a thermal relay and a thermostat.
Drawings and calculation of an indirect heating boiler
The device itself is manufactured using the drawings. Also you will have to make certain calculations of the system. But first you have to decide on the design parameters.
Required boiler characteristics for operation:
- Water flow and storage tank dimensions;
- Coil position and dimensions;
- Additional construction elements - thermostat, heating element.
This data will help you determine the boiler arrangement. Given them, a drawing of the future design is created. Also, the optimum capacity for the tank and the material for building the boiler are selected.
The tank volume is determined by calculating the daily water flow. It is believed that for each family member, 50-80 liters of water per day is spent. This amount will be enough for bathing procedures, washing, washing dishes.
For an average household of 3-4 persons, it is necessary to have a boiler with a tank capacity of 200 liters.
If a hot liquid is used exclusively for household needs, a smaller water heater is required. Enough will be a boiler for 50-70 liters. You do not need to purchase a bigger tank without the need. To heat water is wasted precious heat, and this increases the cost of operation of the device.
Boiler body from gas cylinder with own hands
The body of the product is made of steel. The walls can be thin, since the water temperature should not exceed 70 degrees. A homemade boiler can be made from a gas cylinder or a plastic barrel. To clean the tank you will need to weld a large flange from one end. But this is not an obligatory condition.
Required openings in housing:
- Heating connections;
- Hot water supply;
- Hot water circulation;
- Supply of tap water;
- TEN and magnesium anode;
- Temperature Sensors.
The heat exchanger can be located on the bottom or the entire surface of the internal structure. The hot water outlet is located on top, and a little bit below there is a pipe for circulation. Cold water is supplied from the bottom. The heating element must always be in the water, so it is mounted in the lower part. Temperature sensors take place in the middle of the structure.
Magnesium anode protects elements from corrosion. Its installation is necessary, even when it is not planned to install the heater.
A metal pipe is welded to the holes that work with water and sensors. The diameter of all nozzles must be the same. Under the anode a large tube is provided, a cover, a bolt and an anode are mounted on it.
The heat exchanger is fastened with a shank or nuts. The first option is considered more reliable. Mounting the sink is optional. For these purposes, you can use a tee, which is mounted on the supply of liquid.
Boiler coil for own use
For heat exchanger use copper or brass tubing. The diameter of the nozzle can be from 8 to 20 mm. In this case, the calculation of the molded pipe is done, so that the power is sufficient to heat the tank.
Data for calculation:
- Diameter( parameter is taken in meters);
- Fluid temperature in the heating system;Temperature values of tap water.
To determine the length of the heat exchanger, use a special formula. In this case, the thermal power is divided by the number Pi, then multiplied by the diameter and by the difference in the heating and water temperatures. Obtained data is better rounded and take the pipe with a margin.
To impart a spiral-shaped heat exchanger, the tube is wound onto a blank. The diameter of the coil should correspond to the diameter of the tank. Between the spirals a small distance is provided. The end of the coil is equipped with fittings. Before welding, the system is checked for its operability.
Indirect heated self-heating boiler( video)
It is quite possible to make a boiler itself, since the principle of operation of an indirect water heater is quite simple. It will require a metal barrel, copper pipes and some elements of the system. The manufacturing includes the equipment of an external housing, a coil and connection of pipes.