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How to eliminate a leak in a heating boiler

How to eliminate a leak in a heating boiler

Seeing that water flows from a gas boiler, do not postpone the solution to this problem in a long box. After all, you do not want to change the entire boiler because of a small crack in the heat exchanger, is it so? We will say right away that the heat carrier leaks occur for other reasons and in other places. How to detect them and eliminate them. the theme of our article.

We will tell you by what signs you can quickly determine the leakage. We will tell you which constructive components are most affected by loss of tightness. Our recommendations will help to quickly identify the reason to eliminate it, without waiting for the breakdown to repair.

The better liquid sealant for heating repair

The increased thermal resistance of some special sealants makes it possible to use them for the operational repair of heating boilers

For heating repair, it is not always possible to use outdoor means. What to do, for example, if the leakage is impossible to detect, because the house was hidden pipes and a warm floor was equipped? Do you really have to break the walls and open the floors? No, don’t have to! In such situations, a relatively new method of eliminating leaks is used. by pouring into the system of liquid sealant for heating pipes. Such a sealant is suitable for heating batteries, when it is not possible to apply a clamp on a leak.

The fundamental difference between liquid sealants for the heating system is their ability to eliminate not by applying to a damaged place outside, but directly from the inside.

In an emergency, it is permissible to pour a sealant intended for automobile radiators into the heating system

The essence of this method is that the sealant remains liquid in the mixture with the coolant, and only when contacting the air is polymerized into the system. Gradually hardened, clots of sealant seal the gap from the inside precisely in those places where the integrity of the system is violated.

There are several types of liquid sealants for heating, each of which is adapted to special conditions of application, in particular:

Do not try to look for some universal sealant for the heating system of the house. It is better to purchase a specialized composition for specific parameters of their heating system.

The most famous are liquid sealants among consumers for heating systems produced by the German company BCG. The use of these products is considered an ideal solution to eliminate hidden leaks of the coolant. With proper use, liquid sealant is not dangerous for heating boilers and does not damage the circulation pump and measuring devices.

The sealant for pipes and heating radiators should remain in the system for a long time. Once adding this sealing agent to the heating system, you can forget about leaks for several years.

Herms for closed heating systems eliminate pressure losses associated only with leaks in pipes and batteries, but powerless in cases where the membrane in the expansion tank is broken.

What breaks most often

Despite the fact that Chugun conducts heat perfectly, the batteries have wide channels that minimize the risk that the battery will clog. In this case, it will be worse to heat the room. So why can a battery burst?

Too heavy radiator if the brackets are installed weak or not deep enough (and it happens that they completely forgot about them and the battery hangs on the pipe), over time it sags under the weight of its own weight and leans over.

It would seem that this, but the slightest deviation is fraught with a decrease in the efficiency of the device. In the event that no one paid attention to this and corrected this, corrosion appears and the leak begins. Initially, the lesion of corrosion looks like a small brown spot that increases.

Many mistakenly believe that old radiators live much longer and work more working, but there are those who prefer the models to be more hit. Both will work properly if they are located no higher than the 6th floor.

Subject to the stability of the flow of water, the absence of hydraulic boards, in this case, the battery will warm and work at least 10, at least on the 20th floor. Otherwise, at the site of joints, a leak may form. In any construction store there are a lot of sealants that will help to rectify the situation or completely prevent it.

How to eliminate a leak in a heating boiler

Wet places and quiet hiss (evaporation of water) are visible when you drown the stove.

The left wall of the boiler burned to a lesser extent,

I would like to know how to extend the life of the boiler until the end of the heating season (

It is possible to somehow glue it (than?), attach metal (other material?) plate (thickness?), thereby covering almost burnt places from open flame, or some other option?!

How to repair a boiler in a stove without disassembling the furnace itself.

Unfortunately, Eugene did not indicate what shape the boiler has. Whether it is cooked from pipes or has flat walls. If flat, then extend his life, it may be easier.

Obviously, you need to somehow build up the wall of the boiler with a sheet of Mella 2-3 mm thick in thickness. Then it is guaranteed to last until spring, and in the summer it can be replaced or repairing.

Since the boiler is active and filled with water, it is very problematic to use welding, and the place is not quite suitable. But in any case, it will be necessary to carefully clean the furnace and carefully exfoliate the carpet from the boiler wall.

Option 1. Buy a shamot or refractory brick of a small size and with the help of clay or refractory putty to linen the wall of the boiler from the side of the furnace.

Of course, the efficiency of water heating in this case will decrease, but this winter is not so cold and this will not lead to much discomfort.

Option 2. Put a metal patch (preferably equal to the area of ​​the entire boiler wall) from a 2-3 mm sheet sheet, I use high-temperature putty or sealants.

Such pastes and sealants (withstanding temperatures are up to 1000-1200 degrees) are sold in specialized stores selling fireplaces and stoves. Sometimes they can be found in auto parts stores. You can make such refractory putty and yourself (see. recipes below).

2-4 struts should also be made, preferably with threads, which will reliably press the patch to the damaged wall.

If the boiler is tubular (boiled from pipes), then you will have to use groove segments of pipes as patches, whose inner diameter coincides with the outer diameter of the boiler pipes. And also use spacers or clamps for their reliable consolidation. See how to knead a fistula in a pipe.

(Percentage components are indicated by weight)

Glycerin or ethylene glycol is dehydrated by heating to 250 grams. And withstand for 5 minutes.

All ingredients are thoroughly and quickly mixed and immediately coat the surface.

Putty up to 700 g. Celsius. (parts. by mass)

Clay is poured into a solution of salt and drills, then the rest is introduced. Mix until a homogeneous mass is formed. The part is coated, then dried at high temperature (stove check).

Any of the compositions is mixed and ground with natural olifa. Opeged after drying.

Mix, shut up with water to the desired density and quickly use.

Mix, shut up with clean water. As soon as the mass itself heats up. immediately use. Covering alkalis and acid-resistant.

Dry components are mixed and shut with liquid glass until the desired density. Use immediately.

As you can see, liquid glass is present in the compositions of most high.temperature lugs. Perhaps it makes sense to conduct an experiment with liquid glass, dry clay (sold in cosmetics stores as a scrub for skin), lead glettes (suck), brown.

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As I understand it from recipes, it is necessary to use a certain heat.resistant filler, and use liquid glass as a binder.

Types of sealants

In this life, a large amount of funds with sealing properties are used.

In their chemical composition, sealants are divided into the following main types:

  • Acrylics are unstable, do not tolerate temperature changes;
  • polyurethane. elastic, have high adhesion to metals, are resistant to corrosion and temperature;
  • Silicone. the most common type of universal sealants, retain elasticity and moisture resistance in a wide range of temperatures, durable.

When setting leaks in metal elements of the heating system, a silicone sealant is permissible only to use its neutral variety, but not acidic, since the acetic acid contained in the composition of acid sealant will cause active corrosion of the metal.

The heat.resistant sealant for heating pipes is used in relation to metal and polymeric materials. This tool regularly performs its purpose. to prevent moisture from penetrating from damaged elements of the heating system. A sealing substance, which is a viscous mass, quickly hardens at the site of application and further withstands high temperatures.

Anaerobic adhesive sealant is used to seal threaded joints in modern heat networks instead. The environmental harmlessness of such a sealing agent allows you to use it not only in heating, but also in water supply systems.

The sealant for heating boilers serves to eliminate gaps in places where thermal resistance of the material is required to 1500 ° C.

With this tool, it is possible to close cracks in the heat exchangers and chimneys of boilers and furnaces. After hardening in the seams between surfaces from different materials (metal, brick, concrete), the substance retains tightness.

The better liquid sealant for heating repair

For heating repair, it is not always possible to use outdoor means. What to do, for example, if the leakage is impossible to detect, because the house was hidden pipes and a warm floor was equipped? Do you really have to break the walls and open the floors? No, don’t have to! In such situations, a relatively new method of eliminating leaks is used. by pouring into the system of liquid sealant for heating pipes. Such a sealant is suitable for heating batteries, when it is not possible to apply a clamp on a leak.

How to deal with a problem

Experts recommend not engaged in independent repair, but if you wish and small welding skills, you can try to cope with the problem yourself, while you need to prepare a welding machine and thermal imager.

In the presence of leaks in the radiator, it is recommended to perform certain actions:

How to fix a leak on a Combi central heating boiler

  • Turn off the device from the network, drain the entire liquid and wait until the device cools down.
  • Remove the outer cover, unscrewing the necessary screws, then remove the protection of the camera.
  • Disconnect the entire wiring and tubes brought to the boiler.
  • It is important to remember the sequence of connections in order to correctly assemble the device after repair.
  • Turn on the fan and smoke sensor, and then remove the heat exchanger.
  • The part is repaired by welding with a gas burner. At the first stage, it is necessary to carefully clean the damage site, and then carry out repair work.

After that, everything is set in place in the reverse order. In addition, it is recommended to adhere to some rules:

  • Determining the place of course is much easier to use the thermal imager. This will identify damage accurately and eliminate only the damaged area.
  • With problems with a membrane in an expansion tank, only its complete replacement will help, it is worth buying it in specialized stores.
  • A crack in a heat exchanger is a serious problem that you can try to cope yourself. However, in the absence of experience working with welding, it is better to entrust the repair of a professional master.
  • The cause of the leak may be a loosely closed valve, so first of all, you need to carefully inspect all the valves and, if necessary, close them denser.
  • The leak in threaded joints is eliminated using special seals that differ in increased elasticity and resistance to different temperatures. With their wear, the water begins to leak, so it is recommended to replace them with new. Manufacturers use gaskets made of rubber, paronite, silicone. You can use a simple pacli, which will also increase the tightness of the connection. It is also important to check all the nuts. they should be well fitted.

In some situations, get rid of the problem when a gas boiler has flowed, it will turn out with cold welding, rubber laying or plumbing clamp. However, it is important to understand that such a recovery is short.lived and in the future you will have to either give the device for repairs or buy a new device.

Experts recommend immediately checking the presence of blockages and scraps on the boiler details. If necessary, it is required to clean the normal functionality.

Types of heating systems

In private houses, there are two types of heating systems. open and closed, each of which has both advantages and disadvantages. The peculiarity of each type of heating of the premises is the following criteria:

eliminate, leak, heating, boiler
  • The main difference between the open type of pipe wiring is the presence of an open circuit. The liquid from the boiler rises to the highest point of the building, where the expansion tank of the open type is installed. The coolant, being in the container, has direct contact with the atmosphere. Under the influence of gravitational forces, the prepared coolant on the opposite pipeline returns to the boiler, passing through heating radiators and giving the heat to the room.

The advantage of such a system lies in its energy dependence, and the disadvantages. the complexity of operation. the liquid from the expansion tank evaporates into the atmosphere, which requires constant monitoring of its level.

How To Remove Air From Your Heating System

The gravity network is possible exclusively for heating radiators. if necessary, the second circuit and circulation pump will require installation of a warm floor.

Only water should be taken as a coolant with a gravitational system, since the antifreeze evaporates faster.

  • In a closed system, the circuit for circulation of the coolant is closed, and the expansion tank is a membrane capacity. When the pressure is pumped into the working chamber, the polymer shell is pulled, and the air in the dry chamber is compressed, as a result of which the tension is created.

Closed systems, as a rule, do not depend on gravitational forces, and circulation occurs using pumping equipment. The tank for compensating for excess pressure in this case can be placed at any point of the circuit, which protects it from freezing in a subcutaneous space.

Ethylene glycol, which has a greater specific heat and does not freeze in the cold, can be used as a coolant.

The disadvantage of such a system lies in its dependence on the electric network, and, despite the presence of a gas boiler, when the electricity is turned off, the heating of the premises stops.

The closed system is considered more technological, but it also breaks more often. The expansion tank can flow from excess temperature or the pressure created in it. As a rule, depressurization can occur both according to the threaded connection of the flange on the pipe and on the weld seam of the device case.

Leaks through the safety valve

An important element of the security system is the safety valve necessary for the “insurance” of the closed expansion tank. In boilers for individual heating systems, spring safety valves are usually installed.

Spring.type valve diagram, where the main functional parts are shown, including a clamping spring, a plate of a shut.off element, a saddle

eliminate, leak, heating, boiler

There is a metal spring in the case of such a valve, which presses the stem, and it, in turn, holds the supporting plate in a position when it is tightly pressed to the saddle.

If, with an increase in pressure in the heating system, the expansion tank for one reason or another does not cope with its functions, the coolant enhances the pressure on the plate. The spring at this moment compresses and lifts the plate above the saddle. Through the resulting hole, the excess of the coolant rushes into the drainage pipe and further into the sewer.

If the expansion tank is wrong and its volume is not enough to accommodate all the incoming water, a membrane rupture may occur and the water will fill the entire upper cavity. With a further increase in pressure, a safety valve is triggered, through which the resulting excess of the coolant is removed.

The operation of the safety valve occurs if the membrane was torn due to wear, when air leaks through a faulty nipple, during failures in the operation of automation of control

If the connection of the valve pipe with the drainage pipe is not tight enough, the coolant will not be in the sewage system, but on the floor. To prevent this from happening, during a technical inspection, attention is paid to this site and in the presence of the slightest leaks perform sealing.

The safety valve installed outside the heating boiler has a similar design and can also occur, requiring emergency repair

Must determine the reason for the valve trigger. If necessary, a new expansion tank is installed taking into account the volume of the coolant in the system, change the worn membrane, a faulty nipple or a tank assembled, solve problems with settings and control.

The situation that is emergency for the heating boiler for the safety valve itself is standard, because it is needed precisely in order to reduce the damage from the consequences of the accident. But the valve can fail itself, causing a coolant leakage.

Most often, the breakdown is associated with a spring that constantly experiences loads and ultimately loses its elasticity, which leads to leaks even with normal operation of the system. The faulty valve is replaced with a new.

When choosing a valve, take into account its technical parameters:

The requirements for safety valves for heating systems are regulated by GOST12.2.085-2002.

The traditional material for compaction of threaded compounds is plumbing linen (Packla), to increase the reliability and durability of sealing flax impregnated with a special composition

But what to do if a gas boiler flowed due to a breakdown of the recently installed valve? This happens when a grain of garbage, for example, rust from an expansion tank, falls out with a plate and a saddle. In this case, the valve is removed, washed under running water and installed in place.

The valve is installed so that the spring is located vertically. The case depicts an arrow indicating the direction of the flow of the coolant. To compact threaded joints, heat.resistant elastic gaskets or plumbing linen are used.

How to solve the problem?

When water circulates under pressure in the pipes, the majority of major repairs are not allowed to make it possible. Therefore, you have to act in other available ways to at least temporarily suspend the leak and wait for the emergency service.

With a self.tapping screw

This option is applicable exclusively with insignificant grooves with a diameter of not over 3-4 mm.

To block the holes, you need a galvanized self-cutting screw, which is additionally supplied with a press shame.

It is simply screwed into a hole and fixed. As a result, the water is overlapped. After such a repair, the pipe can last up to 3 years, but it is better to change the bursting fragment at the first opportunity. In addition, the self.tapping screw inside the pipeline leads to clogging the system.


Cast iron or steel pipes are easily closed with cementing.

The sequence of actions is this:

  • A special hard brush for metal carefully removes a layer of rust in the fistula area. The painting metal is also removed, even if it leads to an increase in the hole.
  • Cut off a bandage for a certain length and dip it in a cement solution.
  • Wrap them crack in several visits to form a certain cocoon.
  • On top is coated with cement to consolidate the result.

After the repair work is completed, the pipe must be given time for complete drying. Usually enough day.


The clamp is understood as a rather simple design, consisting of a metal ring, rubber gasket and a tightening bolt.

Such a device is sold in stores, but in emergency situations you can quickly make it yourself. You will need a piece of plastic rubber, scissors and a metal clamp corresponding to the diameter of the pipe.

If the pipe is very rusty, the clamp will be almost the only way to veil the leak. This is because the welding is not applied here.

Salt and salt

Salt is ideal for staging leaks on the pipes of hydraulic pressure under pressure. Step-by-step instruction:

After getting wet, salt is grasped into a crust, which prevents the further flow of water. The method is not particularly convenient to implement, but it is suitable if nothing else was at hand.


Use a sealant (it is also called “cold welding) to eliminate leaks in existing pipelines is not productive, since there is no guarantee of a solution to the problem by 100%.

This is due to the fact that such compositions are designed to work with dry surfaces, and condensation is present on the pipes under pressure.

But with a small crack, you can try to seal it with a heat.resistant sealant. Outwardly it is similar to plasticine.

The small piece is closed, thoroughly wrinkle with your fingers and insert into the hole followed by smearing around. Large gaps will not work out like that, first you will need to insert a wooden chop.

Here you need fiberglass fabric and glue BF-2.

  • The problem area is thoroughly cleaned from rusty particles and degreased by aviation gasoline (acetone will serve as an alternative);
  • They wait about 15 minutes until the surface dries;
  • cut off the tape of such a width from fiberglass that it completely overlaps the leakage place;
  • The glue composition is applied to the edges, and epoxy resin is applied to the center;
  • They are attached to the crack, pressed with a hand and wound;
  • Fixed with copper wire.

The patch will dry for about a day if the batteries are hot. In the summer, when it is cool in the room, it takes about five days.

Wire or tourniquet

A way that reminiscent of the one with a clamp. Only instead they take a medical tourniquet and any metal wire. With rubber, firmly wrap the damaged fragment of the pipe and tightened with a wire.

Wooden chopic

It is necessary to quickly cut out the wedge.shaped pegs of suitable diameter from any wooder. Then they drive it into a hole with a hammer.

What to do to prevent the leak of the boiler

Leaks can be avoided if you prophylact your equipment in a timely manner.

To protect the boiler from corrosion, it should be periodically treated with anti.corrosion agents that can be found in abundance in any specialized store.

To avoid repairs due to the fragrance, you should purchase the device only from the trusted manufacturer. Additionally, regularly monitor the operation of the boiler, make sure that it works without overload and does not heat up to the highest possible temperatures.

To prevent leaks due to high pressure in the equipment, you should constantly monitor the condition of the valve and manometer. If even slight malfunctions are detected. They should be eliminated as quickly as possible. Additionally, at least once every six months, it is necessary to check the membrane valve.

Failure to comply with these recommendations threatens to break down equipment and expensive repairs, and in the worst case. by buying a new boiler.



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