It can be modern, include expensive devices with complex automation. But if the connections are leaky, you can’t even talk about heating efficiency. Constant leaks, loss of pressure.

Numerous problems will turn your life into a constant struggle with accidents. And fixing the situation is quite simple. It is necessary to apply a special sealant for heating at all connecting points, and, according to at least, it will be possible to forget about leaks in the coming years.

On older systems open type It was enough to lay tow at the places where the pipes were connected to the boiler and, and the heating worked normally, but was not very efficient. Today on the market you can find modern materials, easy to apply and provide reliable connection elements. The main task of the sealant is to join the surfaces so that they do not allow water or air to pass through. Moreover, the materials used for heating circuits must have specific properties:

• Durability - given the difficulty of replacing them, it is necessary that they retain their properties for as long as possible;
• Thermal resistance - due to the conditions in which all elements operate and frequent temperature changes, joints must be designed to withstand various thermal changes;
• Chemical resistance - various liquids can be used as a coolant, including those that act aggressively on parts of the circuit. The sealant should not disintegrate or lose its properties when interacting with antifreeze.
• Ease of application - sometimes it is necessary to seal joints without the possibility of disassembly.

What type of sealant can you choose?

Heating system elements can be connected in several ways. They can be securely fastened by welding, but in this case there is no possibility of disassembling the structure if necessary. The use of flange connections is not always convenient and is more common when installing heating plant elements. The most popular is the threaded connection, which is the easiest to assemble, but necessarily requires the use of seals, which can be divided into several categories based on their composition:

• Solid, including various washers and rings;
• Elastic, made from fabrics or threads;
• Liquid or viscous compositions.

Each type of sealant has its own advantages and features of use.

End gasket

From a technological point of view, this is the most interesting option. A gasket made of paronite, fluoroplastic or simply rubber is taken, placed on a part that has a narrowing, onto which a thread is cut, and pressed against the counter part. When the threaded connection is tightened, the gasket compresses and tightly closes all the cracks. Despite the ease of assembly, this seal has several disadvantages:

• It is ineffective without precise processing of parts;
• To connect, the part must have a narrowing;
• Hydraulic resistance increases.

This connection is usually used when installing sensors, and is rarely used in the heating circuit.

This material has a low coefficient of friction, so assembly does not require much effort when making a threaded connection. Using FUM tape you can quickly join parts. This material will last a long time and will not react to chemical influences. Its use is limited by several features:

• When the size of the parts being connected exceeds 25 mm, the sealing deteriorates significantly;
• The tape may break when sealing elements with rough threads;
• Fluoroplastic has low adhesion and can be squeezed out when connecting parts subject to thermal deformation.

This material is not suitable for mounting radiators.

Sealing with special thread

The thread is made from a type of fluoroplastic, Teflon, and has all the properties inherent in FUM tapes. It is even more susceptible to tearing and extrusion. The adhesion of the thread will increase when impregnated with a non-drying sealant.

Linen span

This sealant has been known for a long time and today is widely used in heating systems. The seal is especially convenient when used for connecting radiators. At the same time it is impregnated oil paint. The disadvantages of such connections include:

• Requires a certain level of skill to wind correctly;
• Not too long service life;
• Possibility of drying out.

These problems can be avoided by using silicone sealant for impregnation.

Liquid and paste sealants

These substances are the most convenient to use and highly technological. Depending on their composition they have various properties and are divided into several types:

• Acrylic - rarely used in heating systems, as they are not designed for temperature changes;
• Polyurethane is heat-resistant and does not corrode, has high adhesion to metals, is elastic, but quite expensive;
• Silicone ones are the most versatile; they combine durability with preservation of characteristics at any temperature conditions.

The latter can be produced in several modifications. For fastening metal parts a neutral option is used, since the acidic one can cause metal corrosion.

From the point of view of changing the state, sealants can be drying, hardening some time after application, and non-drying, convenient for application, but capable of being squeezed out when the pressure in the system increases.

If the hardening seal shrinks over time, this can lead to depressurization of the joint. The most reliable sealing method may be a combination of one of elastic sealants with silicone.

How to eliminate a leak without dismantling the structure

Sometimes leaks occur in places that are difficult to access or require disassembling not only the system, but also elements of the building. Gaps may appear in pipes cemented into the wall or in underfloor heating systems that are hidden from view.

For such cases, a liquid heat-resistant sealant is used. This new material poured directly into the system or into the radiator if a leak has formed in it.

It is added to the coolant and continues to remain liquid until it reaches a leak through which air leaks. When interacting with oxygen, polymerization of the substance occurs. Hardening does not occur immediately. Gradually, these particles close the gap from the inside. For various conditions you can purchase certain type liquid sealant:

• For gas and;
• For heating pipes;
• For water or used as a coolant.

You need to purchase a seal that is suitable for a specific case. It should not be used for other purposes.

Liquid sealant designed for use with heating equipment and does not cause any damage. Many manufacturers indicate this in the description of their products. Once such a substance is poured into the circuit, there is no need to drain the water after sealing the resulting gap.

The sealant will circulate in the pipes without affecting the heating efficiency, and its special properties will appear when a leak occurs. Thus, for several years you can not think about the appearance of leaks. The only device it does not affect is the expansion tank.

Mistakes in applying liquid sealant can have the opposite effect and cause pipe blockages. It is better to consult a specialist before using it and check that several conditions are met:

• The expansion tank is in good condition and does not cause a drop in pressure;
• The selected brand of sealant can be used with this coolant;
• The installed boiler can operate using this substance;
• The concentration of substances is selected correctly.

Sometimes for heating systems a car radiator sealant is used.

Selection criteria

The main condition for selection is the ability to tolerate deformation well. The sealant must be elastic and resistant to temperature changes. Therefore, when purchasing an acrylic sealant, make sure that it is suitable for hot weather conditions. Better to use silicone sealant, more suitable for .

Water / gas BCG 30E – leak in water-type heating systems, gas boilers

Liquid sealant BCG 30 E (Germany) allows you to eliminate leaks in water-type heating systems and gas boilers. VSG 30E allows you to avoid water loss of up to 30 l/day, it is used to eliminate leaks during the repair of heating boilers, pipes, boilers, and also helps eliminate leaks in “warm floor” systems at soldering points of plastic or metal pipes. If the question arises of how to eliminate a leak in a pipe, BCG 30E solves the problem from the inside.

Antifreeze BCG F - will eliminate leaks in a heating system with antifreeze

This anti-leak pipe sealant repairs the heating system, which is filled with antifreeze, and eliminates pipe and boiler leaks. BCG F is capable of eliminating coolant leaks up to 20 liters. per day. Elimination of leaks in system materials made of metal and plastic.

Water / diesel fuel BCG 24 - repair of heating boilers and pipe connection leaks

Self-sealing pipe sealant BCG 24 from a German manufacturer can eliminate leaks and water losses of up to 30 liters per day. It is used for plastics and metals, and repairs heating boilers and if pipe connections are leaking.

Heated floor BCG - will eliminate hidden leaks of heated floors

BCG sealant for “warm floors” is used in heating systems with water and gas boilers. It is suitable for materials made of plastic and metal, pipes and “warm floors”. Where a heating leak occurs, ageless, hard and elastic seals are formed. To obtain a long-lasting effect, BCG liquid sealant must be left in the system to eliminate leaks, then the repair of the “warm floor” system will be of high quality.

Cleaning the BCG HR system - cleaning the heating and plumbing system

Special chemical composition allows you to remove scale, rust and dirt in the pipes containing hot water. BCG HR Cleaner can be used to remove contaminants from steel, aluminum and plastic pipes.

Flow 400 liters per day BCG SPEZIAL.

Sealant for eliminating leaks in heating pipes and boilers is used when coolant losses per day are up to 400 liters. It is able to eliminate leaks in the heating system, boiler, and pipes from the inside. BCG SPEZIAL is used for plastics and metals. When in contact with air, the sealant seals and eliminates leaks in the heating system and pipes. This seal is hard, durable and does not age. BCG SPEZIAL is used for heating systems, boilers and pipes.

Flow 1000 liters per day BCG TD.

BCG TD sealant is used in situations where the loss of coolant per day is 400-1000 liters. This sealant can eliminate leaks in heating systems, pipes, and boilers. It is used for plastic and metal in different types of systems to eliminate leaks in a heating pipe.

Content

Important condition effective and safe operation heating units - absence of cracks in the masonry of stoves and fireplaces, tightness of metal chimneys of heating boilers. Heat-resistant sealant helps increase the reliability of structures if used during installation, and also serves as a repair compound, allowing you to seal cracks and gaps at joints.

A variety of high temperature and fireproof sealants

Why is tightness needed?

Brick stoves and fireplaces are prone to cracking due to uneven heating masonry, especially if it is not protected by a layer of plaster or tiles. If the cracks in the body of the heating unit turn out to be through, this entails unpleasant consequences:

• fuel is consumed faster because it burns under conditions of additional oxygen;
• soot may enter the room and settle on the walls and ceiling;
• Combustion products enter the room first carbon dioxide, which can cause poisoning.

Cracks in brick chimney, cracks in the metal pipe for removing combustion products reduce draft, and the heating unit cannot operate in optimal mode. This leads to the fact that the fuel burns at more low temperatures, forming a lot of ash, on inside more soot settles in the chimney.

A large amount of soot and a leaky chimney is a dangerous combination. The intake of air causes the soot to ignite, and it burns at temperatures above 1500°C, causing the chimney to heat up. An insufficiently thick layer of thermal insulation around the pipe will not save wooden structures from charring, there is a serious risk of fire.

For gas boilers, a leak in the chimney results in gusts of wind extinguishing the burner. To avoid the need to regularly check the operation of the boiler, the gaps in the chimney duct are sealed with a special sealant.

Modern materials for sealing heating units

Sealant for fireplaces and stoves - polymer material, similar in structure to paste. It can be one-component or two-component. One-component adhesive sealant is usually packaged in tubes for mounting gun, this is the most convenient option for work. The two-component material is used only by professionals, since errors are not allowed when mixing the composition - you need skill to properly prepare the working material.

High Temperature Oven Sealant

For installation and repair of stoves, fireplaces and heating boilers, special high-temperature compositions, according to the scope of application and material of manufacture, they are divided into two types:

• Heat-resistant sealants. Designed for areas where heating does not exceed 350°C. Suitable for sealing cracks and seams in the external masonry of stoves and fireplaces (but not in places of contact with casting!), for sealing brick chimneys and sandwich pipes. For a single metal chimney pipe, a heat-resistant compound can only be used if it is a chimney of a pyrolysis or condensing boiler - in this case, the temperature of the exhaust gases does not exceed 150°C.
• Heat-resistant and fire-resistant sealants. The high-temperature sealant is designed for use inside the combustion chamber, in places where the masonry comes into contact with the casting. It is used for sealing any chimneys, including the junction with the outlet pipe of the stove. Fire-resistant sealant is a type of heat-resistant sealant that can withstand direct contact with flames. Not all heat-resistant compounds are fire-resistant (fireproof); when purchasing, pay attention to the labels on the packaging.

Select mounting and repair composition for boilers and furnaces, it is necessary to take into account the temperature conditions of the zone where they will be used. Based on their composition, sealants are divided into silicone and silicate.

Heat-resistant compounds

Thermal sealant is a silicone-based material. Due to the introduction of iron oxide into the composition, the material has a reddish-brown tint. Manufacturers offer sealing silicone compounds with different temperature thresholds; specific data are indicated on the packaging.

Pay attention! High-temperature silicone sealant, which is produced in ordinary tubes and is actively used by motorists, cannot be used for repairing stoves and chimneys. This material is acid based and is not compatible with cement mortar and metals prone to corrosion. The acid released during hardening reacts with the materials to form salts or oxides. The formed brittle layer is destroyed and the seam loses its tightness.

Neutral heat-resistant silicone sealant is compatible with all materials; when dry, it releases alcohols and water.

High temperature silicone sealant

Its advantages include:

• resistance to UV radiation - the material is suitable for sealing cracks on the outer part of the chimney, joints of roof penetrations;
• hydrophobicity - due to water resistance, it is used to seal the junction of penetrations to the roof waterproofing;
• high adhesion to materials of different structures, including brick, cement, metal;
• maintaining elasticity after drying - the tightness of the connection will not be compromised by slight vibrations.

Attention! High temperature silicone is universal in use - it is successfully used for sealing threaded connections when installing heating circuits.

Working with heat-resistant composition

Heat-resistant sealant for stoves and fireplaces is applied to a clean, degreased surface. If the material was moistened during cleaning, you should wait until it dries completely. Metal surface It is recommended to sand it so that the applied composition holds more firmly.

Preparing the oven before applying sealant

Silicone paste requires access to air for polymerization. Therefore, the thickness of the seam should not exceed the values ​​​​specified by the manufacturer.

The curing speed is a parameter designed for the use of a silicone composition at a temperature of about 23 degrees and a humidity of about 50%. Under real conditions, the polymerization rate may be higher or lower than indicated. At low temperatures, the paste hardens more slowly.

Due to the elasticity of the material, it cannot be painted - dried paint falls off. Silicone pastes for stoves and chimneys are red or brown. Transparent materials Cannot be used on silicone base!

Heat-resistant compounds

Heat-resistant sealant is a silicate-based sealing paste. In normal operating mode, such material can withstand heating up to 1300 degrees, and with short-term exposure - up to 1600 degrees. Fireproof sealant is a type of heat-resistant sealant that is not afraid of contact with fire.

Heat-resistant sealant for stoves and fireplaces

Silicate pastes are intended for installation of fireclay masonry in furnace fireboxes, for treating casting installation sites, for repairing heating boilers (eliminating leaks). The same composition is suitable for installation of metal single-walled chimneys and sandwiches - they are used to glue the joints of modules and seal fistulas.

Working with heat-resistant composition

The heat-resistant composition has high adhesion to brick and cement. It adheres well to metal if the surface is pre-treated abrasive material and low fat. Brick or other porous material Before applying the silicate composition, they remove dust, degrease and always moisten with water - this is the main difference between the technology and the use of silicone heat-resistant material.

Repair and installation work using silicate paste is allowed only at positive temperatures (from +5 to +40 degrees). But at temperatures below +20 degrees the composition dries out longer than the deadline specified by the manufacturer. Excess composition is immediately removed with a damp cloth so that you do not have to scrape the dried paste from the surface of the masonry. The thickness of the seam must correspond to the parameters specified in the instructions for use, otherwise the material will not gain the necessary strength and will crack.

Filling the seam between bricks with heat-resistant sealant

Heat-resistant sealant for furnace masonry is inelastic, so it cannot be used in places where the connection is subject to deformation and vibration loads. Under such influence, the dried composition will crumble. At the same time, the inelasticity of the material allows it to be painted in any chosen color. The paste itself can be gray or black. When working with it you need to use protective gloves, since if it comes into contact with the skin, the sealant can cause a chemical burn.

The silicate composition makes it possible to install a collapsible chimney - metal pipes“sit” on the oven sealant, while only the joint itself is processed. If you need to disassemble the structure, just loosen the connection - the dried paste will crumble.

Pay attention! When using oven sealant, it is important to follow the manufacturer's directions. Some silicate compositions require drying for several hours, changing the intensity of fuel combustion. The drying mode is described in detail on the packaging.

Silicate paste is used to fill the joints of masonry stoves and fireplaces. In order not to spoil the appearance of the stove without cladding, carefully seal the bricks before opening the seams masking tape. The expenditure of effort and time will pay off aesthetically appearance masonry

Popular brands

The market offers sealing materials for stoves, fireplaces and chimneys. They are selected according to their composition and temperature conditions operation. It is recommended to use products from reputable manufacturers.

Soudal

Soudal (Saudal) is a Belgian company that specializes in the production of sealing compounds. Soudal sealant for stoves and fireplaces is the Soudal series.

Sealant for Soudal ovens

Calofer, heat-resistant compounds in black. Materials based on sodium silicate do not emit toxic substances when heated and can be painted. Suitable for sealing cast iron elements of boiler units. One of the advantages of Belgian products is their resistance to cracking and crumbling.

Penosil

An Estonian company produces silicate paste for Penosil +1500 ovens. The material has high heat resistance and is black in color. Foam is cheaper than the products of the famous Belgian manufacturer, but is not inferior in quality. This makes Estonian sealant widely in demand among professionals and home craftsmen. The company's product line also includes the silicone sealing compound Penosil Hight Temp, suitable for use for moving joints due to its elasticity.

Oven sealant Penosil Premium

Tytan

Under this brand, sealing compounds are produced by Selena Group, a group of Polish manufacturers of professional materials for construction and finishing. The sealing paste contains fiberglass, which provides the sealed seams with increased gas tightness. The material is designed to be heated to high temperatures (1250 degrees), which makes it suitable for sealing seams and cracks in fireplace and stove masonry, and for installing chimneys. Products of the Tytan brand, as well as sealants with similar properties, which are produced under the Baumaster brand, belong to the middle price category. In terms of price and quality ratio it is best option for a wide range of consumers.

Silicate sealant for fireplaces Tytan

Macroflex

A well-known Estonian manufacturer of sealing materials supplies the market with fire-resistant silicate composition Makroflex HA147. It can withstand short-term heating up to high temperature+1500 degrees and exposure open flame. The advantages of the paste of inorganic materials include adhesion to most materials used in construction and the absence of shrinkage upon drying and under the influence of temperature fluctuations.

Fireproof silicate sealant Makroflex

Krass

The Russian manufacturer offers the refractory composition “Krass fireplaces and stoves”. Using this material, fireclay masonry and fireproof masonry can be installed in the furnace firebox. The composition can withstand sudden increases in temperature and is not afraid open fire, suitable for renovation brick kilns and fireplaces, as well as heating boilers. This is a non-shrinking material made on the basis liquid glass. Thanks to its paste-like consistency, it is easy to apply.

High-temperature silicate sealant Krass

It follows from this

Sealing heating units requires the use of highly specialized materials, each of which has its own subtleties of application. It is important to carefully compare characteristics when choosing formulations, even those related to the same application. They may differ in requirements for drying conditions during installation and operational parameters.

- How to add BCG to the system?

Remove dirt filters before completing repairs. The system must be filled with coolant. Shake the sealant until the sediment is completely mixed.

Pour BCG into a pump container and dilute with water. Connect the system and pump with a hose and clamps. Open the valve and pump sealant into the system.

Close the valve, disconnect and flush the pump. Turn on the system in normal operating mode. The leak is eliminated within 1 to 7 days.

For such hopeless situations When it is difficult to find leaking heating pipes and fix them, four decades ago in Germany they created the BCG liquid sealant.

How similar problems solved in Germany? A team called to fix a heating leak offers the cottage owner two options. The first involves breaking into floors and walls. Fixing leaking heating pipes is expensive, dirty and takes a long time. And the second one is simpler, cheaper, cleaner and faster using BCG liquid sealant.

The goal is to eliminate the leak in the heating system.

The use of liquid sealant does not provide a 100% guarantee of success, since the reason why the heating pipe leaked is unclear, and the location of the leak is hidden. Rarely, there is a heating pipe leak that a liquid sealant cannot eliminate.

Here are some cases that we have encountered in our practice:

• In Vladikavkaz, the owner of the house ordered liquid sealant 5 times! The floors in the house are covered with marble, which I didn’t want to break. The liquid sealant helped for a short time, but then the heating pipe leaked again. When the floors were opened, it turned out that pipes for cold water! After repairs with liquid sealant, when heated, they burst each time in new places - leaking heating pipes is inevitable.
• One winter we were fixing a leak in the heating pipes of a cottage near Moscow. And in April, the heating pipes leaked again. Only by chance did we find out that the foundation under the house was 50 cm! And this is in the Moscow region, where it should be 150-170 centimeters in the ground. In the spring, the clay under the house thaws, and the building shakes. It is impossible to fix a leak in the heating system in this house with a liquid sealant for a long time.

Fortunately, such cases are rare. More than 1000 repairs in Russia have been completed successfully. Thanks to the sealant we provide, heating leak has been fixed. And in Europe, over the course of several decades, this number has exceeded one hundred thousand. If heating system leak by the nature, amount of coolant loss, and other factors, correspond to the capabilities of the sealant described in the instructions, then Heating leak repair will be successful. The owner of the house will forget for a long time, if not forever, what a leaking heating system and leaking heating pipes mean.