We make a boiler for indirect heating of water with our own hands


In the cold sea­son, the issue of hot water sup­ply becomes acute in places where there is no cen­tral­ized one. Typ­i­cal­ly, these places include coun­try hous­es and coun­try hous­es. Instal­la­tion of fin­ished equip­ment will cost the own­er rel­a­tive­ly expen­sive. There­fore, many decide to make an indi­rect heat­ing boil­er with their own hands. This option is con­sid­ered one of the most inex­pen­sive and eco­nom­i­cal dur­ing use.

Principle of operation

Such units have a sim­ple prin­ci­ple of oper­a­tion, you just need to under­stand their device. So, the appa­ra­tus is a tank, inside which heat­ing pipes pass. They sup­ply heat trans­fer flu­id to heat the room. While the liq­uid flows inside the device, the water used for house­hold needs also heats up. That is why the device got its name. The coil is heat­ed in two ways:

  • con­nect­ing the sys­tem to a more pow­er­ful heat­ing device (for exam­ple, a boil­er);
  • con­nec­tion to the cen­tral heat­ing sys­tem.



There are sev­er­al options for such tanks:

  1. The most pop­u­lar is the use of a met­al coil inside the tank, made from a pipe of small diam­e­ter. Water is drawn into the ves­sel, which heats up upon con­tact with the bent com­po­nent in which the coolant flows.
  2. Pipes can be placed not in the cen­ter, but next to the walls. The sys­tem is no dif­fer­ent any­more. This option is con­sid­ered even bet­ter, since the area of ​​u200bu200bcontact between water and the curved ele­ment is larg­er.
  3. Not tubes are used, but con­tain­ers with dif­fer­ent diam­e­ters. They are locat­ed one inside the oth­er. Liq­uid for house­hold needs is col­lect­ed in the small­er one, and the coolant is sup­plied to the space between the walls.

Before you cre­ate an indi­rect heat­ing boil­er with your own hands, you must def­i­nite­ly con­sid­er all the pos­i­tive and neg­a­tive sides.


Such units have a lot of advan­tages:

  • reduced use of ener­gy resources;
  • reduc­tion of oper­at­ing costs;
  • avail­able mate­ri­als for pro­duc­tion and their min­i­mum quan­ti­ty;
  • The water tem­per­a­ture is always main­tained at the same lev­el.


Despite the obvi­ous advan­tages, such devices have a num­ber of dis­ad­van­tages:

  • for large units, you need to allo­cate a sep­a­rate room;
  • heat­ing a large vol­ume of liq­uid takes longer, while the tem­per­a­ture in the house ris­es more slow­ly;
  • the rapid appear­ance of deposits in the tank and on the coil, which must be removed mechan­i­cal­ly or chem­i­cal­ly at least twice a year;
  • the prob­lem­at­ic repair of inter­nal com­po­nents — more often it is just a replace­ment.

Creating a boiler

  1. From the very begin­ning, a con­tain­er is pre­pared, which will act as a tank. You can use any stain­less steel ves­sel, even non-sealed ones. To work with it, you need a weld­ing machine. It should be not­ed that glass-ceram­ic and enam­eled ves­sels wear out quick­ly with such use and require replace­ment. There­fore, it is bet­ter to stay on stain­less steel. The most pop­u­lar is the use of a gas cylin­der. It is cut into two halves, cleaned, primed and weld­ed back. Of course, this can not be done, but then the water will smell of gas for a long time.
  2. Then you need to make high-qual­i­ty ther­mal insu­la­tion of the walls of the tank. This is done using dif­fer­ent mate­ri­als: polyurethane foam, glass wool or any oth­er insu­la­tion. In order for the insu­la­tion to per­form the nec­es­sary func­tions, the entire sur­face must be cov­ered. Often an addi­tion­al tank is used for this. The con­tain­er is installed in a large one, and insu­lat­ing mate­r­i­al is placed between them.
  3. Coil. It is made from a met­al pipe of small diam­e­ter. It is wound around a cylin­dri­cal object. Anoth­er pipe of a much larg­er diam­e­ter is best. Thread­ed fit­tings are attached to the ends of the result­ing spi­ral. Do not make the turns too tight to each oth­er, as it will not be con­ve­nient to remove and mount it back. And this will need to be done at least a cou­ple of times a year.
  4. After prepa­ra­tion, the time comes when you need to assem­ble the boil­er with your own hands. So, two holes are made on the tank: for cold water from below, and for hot water — from above. This is due to the phys­i­cal law that hot mass­es always rise up. Cranes are mount­ed on the holes. In addi­tion, you also need to make anoth­er hole at the bot­tom — for the drain pipe. This will help, if nec­es­sary, quick­ly remove all the water from the tank. After that, two more holes are cut into which met­al fit­tings are installed. The coil will be attached to them.
  5. After assem­bly, the entire sys­tem must be checked for leaks. This is best done care­ful­ly. First­ly, this is the only way to achieve the opti­mal lev­el of heat­ing of both sys­tems. Sec­ond­ly, if oil or the same antifreeze is used in the sys­tem, prob­lems may arise when using water for house­hold needs. Not to men­tion the fail­ure of some com­po­nents or even the entire struc­ture. To check, you need to coat the coil with soapy water and let the air inside. The same must be done with all con­nec­tions.
  6. The top of the tank is closed with a lid with a rub­ber gas­ket. It is also insu­lat­ed.

Inter­est­ing! There are options for mount­ing even a plas­tic con­tain­er, but it should only be made of food-grade PVC. In addi­tion, prob­lems may arise in case of unfore­seen con­tact with the heat­ing sur­face.

After that, it remains only to install in the sys­tem. You can use.

As you can see, every­one can make their own indi­rect heat­ing boil­er. It is con­sid­ered an eco­nom­i­cal option not only dur­ing man­u­fac­ture, but also dur­ing use. Such a sys­tem allows you to have heat­ing in the house, and for small ener­gy costs to get warm water for house­hold needs. In this case, the vol­ume of the tank can be made based on needs.


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