How to remove the secondary heat exchanger of a gas boiler

Changing the heat exchanger in a gas boiler with their own hands

Any part of the gas boiler can fail sooner or later. The heat exchanger is one of the main elements of the unit. With prolonged use, it can also fail. Usually it is due to the burnout of the surface or the appearance of leaks. The only way to fix the problem is to replace the heat exchanger in the gas boiler.

How to wash the boiler heat exchanger from scale

The operation manual, supplied with boilers manufactured in Europe, prescribes how often the heat exchanger must be cleaned. Service is required if the following signs of limescale occurrence are observed:

Maintenance is performed in several ways, with varying efficiency and results. Cleaning the heat exchanger of a gas boiler with their own hands, mostly involves the use of chemical reagents and methods using improvised means. During the service in the specialized centers, the pumping equipment is used, as well as professional cleaning compositions.

Equipment for flushing heat exchangers

Device for cleaning the heat exchanger of gas boilers, called booster. The device includes a pump that creates pressure in the heating circuits. Suitable for cleaning the primary and secondary heat exchanger. Boosters are used in specialized service centers.

The apparatus is charged with a chemical reagent and connected to the heating circuit, through the outlets on the boiler body. The method of flushing the two-circuit gas boiler, involves connecting to each heat exchanger in turn.

The essence of the method is as follows: the booster pressurizes and forces the reagent to circulate in one direction. After a while, the recirculation is automatically activated. Thus, the heat exchanger is flushed in different directions, which leads to complete cleaning of the cavities from scale.

To clean the heat exchanger of a gas boiler from scale at home and achieve a quality result, you will have to buy a household booster. The products are available under the following brands:

Tools for rinsing the heat exchanger

Remedies from lime scale, for convenience, are divided into two categories:

Handy remedies are especially popular because of their low cost and general availability. Remove the scale with vinegar, citric acid. The advantage of such methods, the minimum negative impact on the material of the heat exchanger.

To wash the heat exchanger of a gas boiler with citric acid or vinegar, will benefit, you will need to soak the heat exchanger in a solution, first removing and filling it with the composition. To soak the circuit, it will take about a day. This method is effective only when cleaning a small layer of scale.

Chemical agents. an effective way to clean the scale at home. For flushing, a removable and non-removable method is used. The circuit can only be completely cleaned of moderate deposits by means of a booster. The apparatus is filled with liquids for flushing gas boiler heat exchangers. The chemical agents are based on hydrochloric acid, sulphamic acid, orthophosphoric acid and reagents (AntiKidpin, etc.).п.).

Chemical cleaning has its disadvantages. After the procedure, it is not uncommon for rubber seals and welds to leak. Therefore, a technical prerequisite for acid flushing is a mandatory inspection of the tightness of the connections after the service.

Flushing the coil of the gas boiler with hydrochloric acid, can cause leakage of the circuit. This method is not recommended for heating units after five years of operation.

If none of the above methods is suitable, hydrodynamic cleaning is used. Liquid for flushing gas boiler heat exchangers, is made on the basis of an ordinary aqueous solution with the addition of abrasive substances. Hydrodynamic cleaning is used exclusively in specialized service centers.

For self-cleaning with a booster or collapsible method, the following remedies are used:

Before buying, pay attention to the composition of the product, the scope of its use and strictly follow the instructions.

How to keep the heat exchanger in the boiler free of limescale

To get rid of limescale in the heat exchanger, it is quite problematic and requires an investment of material resources. Not always, even with skilled assistance, it is possible to get rid of calcium and magnesium deposits. For this reason, it is better to prevent the appearance of limescale. To do this, use the following methods:

    Filled with high quality coolant. optimally distilled water will do. The liquid from the heating system is not drained unnecessarily. After several heating seasons, the composition of the coolant becomes optimal.

It is impossible to completely get rid of deposits. During a periodic service of the boiler, the heat exchanger is cleaned.

How and what to clean the gas boiler heat exchanger by yourself

Any technique needs maintenance, and gas boilers are no exception. Many homeowners for years and even decades do not remember the need to flush the heat exchanger, but sooner or later they have to do it. Regular maintenance not only extends the life of the equipment, but also saves the owner money. What are the signs that determine whether it is necessary to flush the boilers?? How to properly perform it with your own hands?

Why do you need regular cleaning of the gas boiler Most of the year in the heating system is constantly circulating water. Over time the parts of the equipment deposits from salts, lime, impurities in the coolant. The harder the water is, the more mineral deposits appear on the system elements. They remain in the heat exchanger for the gas boiler, which negatively affects its operation.

The principle of operation of heating equipment is based on the fact that the coolant is heated by passing through the curved channels of the coil. To raise the temperature of the fluid, special plates are used. Thanks to these additional elements, the coil itself and the water that enters it, heats more evenly. Assembled system looks like a car radiator.

The efficiency of the equipment depends largely on the thermal conductivity of the materials of which it is assembled. Usually use copper or alloys with this metal. Any buildup, deposits on the inner surfaces of the coil tubes lead to a decrease in thermal conductivity and deterioration of the system.

Preventive measures. it is profitable

If the equipment is not cleaned in time, problems can arise:

The heat exchanger of the gas boiler is constantly overheating and fails faster. It can be replaced, but such repairs are very expensive. To this amount should also be added the inconvenience and expense of heating the home while the equipment is being repaired. Usually include electric heaters, and it significantly increases the cost of repairs.

Lime scale makes it very difficult to pass the coolant through the system. The more fouling, the higher the load on the circulation pump. The equipment has to work constantly in emergency mode, which leads to natural wear of parts and adversely affects the life of its operation.

A clogged boiler heat exchanger works less efficiently. It requires more energy to heat up. Accordingly, the gas consumption increases (10-15% on average). This means that the owner will be overpaying for heat, and the house will be worse heated. Simple calculations show that the amount per season will be close to what is paid on the bills for an entire month.

How often do you clean the heat exchanger in a gas boiler

The frequency of the heat exchanger cleaning depends on the type of heat transfer medium and the construction features of the appliance itself. Single-circuit boilers in heating systems with treated water as the coolant are least often serviced. Preventive maintenance every 4 years is sufficient to keep them in good condition.

If there is raw water circulating in the system, the boiler must be flushed once every 2-3 years. If the water is hard, the cleaning schedule is once every 2 years. The secondary heat exchanger of the double boiler must be flushed with the same frequency, i.e.к. Unfiltered tap water with impurities flows through it.

The equipment in the heating systems with antifreeze as the heating medium is most often in need of service. It should be flushed at least once every 2 years. In addition, you have to monitor the expiration date of the antifreeze, replace it in a timely manner. Otherwise, the efficiency of the system will decrease, and heating costs will increase.

During cleaning of heat exchangers pay attention to the appearance of boilers, nozzles and, if necessary, carry out repairs. You should also monitor the condition of the chimneys, clean them from soot in time. These simple measures prolong the life of the heating equipment, prevent breakdowns.

Contact a craftsman or do it yourself

Professional cleaning of heating boilers is expensive. Depending on the condition of the equipment and the nature of its operation the amount can range from a few tens to hundreds of dollars. In addition, craftsmen rarely come in the next few hours, sometimes you have to wait a few days. It is not convenient. The cost of professional cleaning with a special station for flushing heat exchangers pays off: the parts are washed from inside to shine, and the equipment works much better. But if you want you can always save money and do the same thing yourself. The result will not be worse, and you will have to invest only your own time and effort.

Ways to clean the heat exchanger of a gas boiler

There are two basic types of flushing the heat exchanger of a gas boiler. with and without disassembly of the unit. To disassemble the equipment, you will need tools. What exactly. it depends on the design of heating equipment. In some cases, it is not possible to remove the heat exchanger at all, but you can get access to it by removing some parts.

Before starting work, you should prepare the equipment:

Disconnect the boiler from all power sources, drain the system and the expansion tank. There should be a special fitting for draining the coolant. If not, you will have to turn off the water supply to the house, and then pour it out of the system into pre-prepared basins and buckets.

When there is no water left in the system, you can start dismantling the equipment. First remove the front of the housing to gain access to the heaters. If the boiler is two-circuit, then the heater of the second circuit is located closer, the main circuit is located farther. To remove it, you need to disassemble the combustion chamber.

Construction parts are usually contaminated. From the outside, it is desirable to wash them with a special composition that removes soot and carbon deposits. If you don’t have any of those, you can use the traditional household chemicals that are used to clean ovens. gels, scouring pastes, etc.п. They should be used only in extreme cases, since even the most aggressive household chemicals are not able to clean the scale as well as a specialized, but can damage the materials.

On the inside, the elements of the unit can be washed with a strong aqueous solution of citric acid. It does not corrode the metal, but is good at removing scale, lime deposits. Most often there is a lot of fouling. Half measures will not do the trick. In this case you will need equipment for flushing gas boiler heat exchangers. You can make a simple installation with a circulation pump with your own hands.

There are three basic ways to clean boilers: manual, hydrodynamic, chemical boiler flushing. Below we will consider them in more detail.

Independent manual cleaning

Manual cleaning of boilers without the use of special mechanisms is called. You only need simple tools, which are available in almost every home. The boiler must be partially disassembled to gain access to the heat exchanger and remove it. Next, you should decide how best to remove the dirt. mechanically or with the help of chemical solutions.

If you decide to remove the scale by mechanical means, you should have a scraper, brush and vacuum cleaner to remove small particles of sediment. If you plan to chemically rinse boilers from scale, you can use a solution of citric acid, or better yet buy a specialized tool.

Well-proven brands MasterBoiler and SVOD TWN Professional. They are available in different forms. There are liquids, which do not require special preparation before use, and powders. When using them, read the instructions carefully. Some compositions foam, and you must be prepared for this.

How to Wash a Gas Boiler from Scale? Almost all compositions are suitable for removing calcium carbonate deposits, and only certain preparations cope with iron oxide deposits. When buying a product, it is important to make sure that it is designed for the types of deposits that are specific to your boiler. Of the popular products that remove iron-oxide scale, you can advise SVOD TVN Extra.

Tip. Exercise extreme caution when dismantling and cleaning the boiler so as not to damage parts. Installing them in place after manipulation, check the tightness of each connection.

Option #2: chemical flushing

Boosters are often used for flushing boilers. These are special installations that pump fluid into the channels of the heat exchanger. You can make a booster for flushing heat exchangers with your own hands by connecting a circulating pump so that it runs an acid solution, flushing the equipment from the inside.

High-quality flushing can take up to 10 hours if the ducts are heavily contaminated, but usually takes much less time. Cleanliness indicators: carbonate and iron deposits completely disappear, and the inner surfaces of the ducts are shiny. Special compositions are used to neutralize residual acid preparations and are poured into the booster to flush heat exchangers at the end of the procedure.

Option #3: hydrodynamic cleaning Hydrodynamic flushing of boilers and heat exchangers resembles chemical flushing because it also uses pumps and acid solutions. The main difference is that the liquid is pumped under high pressure. Sometimes preparations with abrasives are used as cleaning agents.

Since sediments are destroyed under the influence of water hammer, the procedure itself is quite dangerous. If the pressure is higher than allowed, the pipes can be damaged, and their repair will cost a serious amount of money. It is better not to risk and trust this work to professionals.

Cleaning from soot and soot with your own hands

Soot and grime make it difficult to operate the heating equipment. There are models that in such cases automatically shut off. If this does not happen, then the products of combustion can enter the room. Harmful gases can poison the occupants of the house, so it is important to clean the boilers in time to prevent such situations.

Prepare the tools: brushes, screwdrivers, open-end wrenches (most often 8-17 wrenches are suitable), a needle, a cleaner, a rag. If you plan a complete cleaning of ducts at the same time, you will also need a gas boiler heat exchanger flushing agent.

Turn off the gas, remove the front wall of the boiler, disconnect the wires, ignition electrode, burner tube. It is advisable to replace the pilot burner gasket as soon as possible during the cleaning process

Next, you should take out the burner, swirlers. They and the surface of the heat exchanger are cleaned with brushes. soft and metallic. Blow out the ducts from the inside with a vacuum cleaner.

It is advisable to clean the burner with a cleaning brush and a needle smaller than the diameter of the hole in the burner.

remove, secondary, heat, exchanger

Advice. Do not try to enlarge the burner hole with a thicker needle. It will be easier to clean next time, but the performance of the heating equipment may deteriorate.

When the cleaning and washing of heat exchangers of gas boilers with their own hands is finished, the equipment is assembled in the reverse order. Firstly, the burner, the nozzle, the pipe and the ignition electrode are installed, etc.д.

Test the assembled boiler. Turn it on and check the tightness of pipes and burners. If the equipment is working properly, it can be put into operation. If there are any failures, then the boiler will need to disassemble and seal the connections again.

The article offers options for flushing the heat exchanger of a gas boiler with your own hands and videos demonstrating the order of work. It is advisable to carry out these procedures at least once every 2 years, and the cleaning from soot once a year. The best time is before the heating season begins. As a rule, the equipment is cleaned and inspected in early September, t.к. It often gets cold at the end of the month and you have to turn on the heating at least overnight.

Attention! If you are not confident that you can cope with the flushing of the heat exchanger of the gas boiler with citric acid or a special agent, contact the professionals.

Gas boiler cleaning options

There are several basic methods for cleaning gas boiler heat exchangers:

How to remove the main heat exchanger on a Baxi Duo-tec or Baxi Platinum boiler

Which method to use depends on the extent of the blockage. Let’s take a closer look at each of the listed methods.

Manual cleaning

Not all users of gas boilers know how to clean the heat exchanger of a gas boiler by themselves. Manual cleaning is the easiest way to do it yourself. There are two ways to perform this method:

  • mechanical. using a brush and brush;
  • Washing with active solutions. a more effective option, especially useful for boilers with two circuits.

With heavy fouling use two methods of descaling. first rinsing and then mechanical cleaning. This process is carried out in the following steps:

  • shut off the gas and disconnect the unit from electricity;
  • open the lid of the gas boiler;
  • dismantle the heat exchanger;
  • Place it in an active substance, such as a solution of hydrochloric acid;
  • Remove the heat exchanger from the solution and clean the impurities with a brush or brush;
  • Rinse the element with water outside and inside;
  • dry and put the circuit back on.

Dry cleaning

Chemical cleaning is distinguished by the use of a booster or its analogues, as well as aggressive chemicals. An important aspect of chemical cleaning is to maintain a safe concentration, so that the substance does not corrode the surface of the heat exchanger.

Chemical cleaning is carried out with the booster, but many craftsmen create its cheap counterpart with their own hands. A 10-litre bucket is used, fitted with two hoses and a pump.

Learn here how to change a gas boiler. rules and responsibilities

If the scale layer is too large, substances based on sulfuric or hydrochloric acid can be used for cleaning. The simplest cleaning solution of citric acid: 200 grams of powder diluted in 5 liters of water.

The chemical cleaning process is quite simple:

  • Chemical solution is diluted in a container and poured into the booster;
  • Two hoses are connected to the two connections of the boiler. inlet and return;
  • turn on the device and run the liquid through the heat exchanger several times.

Factory boosters have a heating function, which allows you to rinse the circuits with greater efficiency.

After the procedure, you need to drain the reagent and flush the system again with a neutralizing agent or clean water.

Of course dry cleaning is more effective than manual cleaning, but the active substances contained in the solutions can lead to corrosion. Therefore, this method should not be used often.

Solutions for cleaning the heat exchanger

Some owners of gas boilers on the forums are interested in what to wash the gas boiler from scale at home. The following products are commonly used for dry cleaning:

  • Cleaning gel. it is considered the mildest agent. After it is enough to rinse the heat exchanger with running water. Despite the gentle effect, the gel is excellent for dealing with limescale and limescale deposits.
  • Adipic acid. in order to flush the heat exchanger of the gas boiler with acid, it is important to dilute it with water in the correct proportion, otherwise the substance will damage the metal surface. Adipic acid is good for softening all deposits inside the heat exchanger. After rinsing the system with this agent the neutralizing liquid should be run through it.
  • Sulfamic acid. good for dealing with difficult impurities. The substance is diluted with water and added to the booster. After the process is complete the heat exchanger must be flushed with a neutralizing liquid.

Hydrodynamic cleaning

This method of cleaning the heat exchanger can only be carried out by specialists. There is no need to disassemble the boiler and remove the heat exchanger for this procedure. The principle of the hydrodynamic cleaning is as follows: the liquid is pumped into the system and pressurized several times. For greater effectiveness, abrasive cleaning agents are added to the water. Due to the rapid movement of water, the scale falls off and impurities are washed away.

However, with this method, it is important to correctly calculate the strength of the pressure. if it is too high, a pipe breakthrough can occur. Therefore, hydrodynamic cleaning should not be performed independently.

How to properly ground a gas boiler?

Using a vacuum cleaner or brush clean all surfaces inside the boiler Secondary heat exchanger put in a pot and cover with water diluted with citric acid (30-50g per 1 liter of water). Pour the water solution with citric acid inside the exchanger, so that the water appears at the hot water inlet opening

Diluted hydrochloric acid does not react with copper in normal conditions. only in the presence of high concentrations of oxygen, so hydrochloric acid can safely wash copper heat exchangers of wall mounted gas boilers (or cleaning of heat exchangers containing copper alloys).

How to remove the heat exchanger with a gas boiler Arderia

Boilers of this brand. Have proven themselves in operation in Russia. Yes, they are less reliable than the famous German boilers. But. low price makes the buyer forgive the boiler everything.

Last year. Arderia boiler began to produce in Russia, and since then sales of boilers of this brand only grow.

Of course, to repair the boiler. It is best to invite a specialist. However, such work, how to remove the heat exchanger from the gas boiler Arderia. can be done independently. Since the heat exchanger. Not related to gas, hence the work on its removal and installation. fewer requirements.

In order to remove the heat exchanger Arderia boiler. A Phillips screwdriver and a set of gaskets will be needed.

Before you begin, you must make sure that the boiler is disconnected from the power grid, the gas supply and water mains are blocked, the boiler is disconnected from the heating system, and the coolant from the boiler. drained.

Remove the front cover of the boiler. To do this, unscrew the two screws from the top.

In general. There are two types of fastening of the front panel. First. with 4 self-tapping screws, 2 on top and 2 on the bottom. This is exactly the option we will consider here.

The second. on the two hooks on top and the two self-tapping screws on the bottom. We are sure you won’t have any problems removing the front cover, and in this case.

Remove the front control panel.

To do this, unscrew the four fixing screws.

Carefully move the panel aside. Here’s the main thing. Do not damage the capillary tube of the manometer.

Dismantle the lid of the boiler air chamber. To do this. unscrew fixing screws of the cover.

Remove the left side wall of the boiler. To do this, remove the two self-tapping screws at the top.

Remove the combustion chamber. First of all. remove the front cover of the camera.

To do this. Unscrew the two self-tapping screws in the upper part of the combustion chamber. And two self-tapping screws. in the lower part of the combustion chamber.

Remove the smoke exhauster. To do this. disconnect the wires from the fan itself, from the overheating sensor, and. Disconnect the condensate collection pipe.

After that. Unscrew the 4 tapping screws to remove the fan.

This is what the combustion chamber looks like without the fan.

Remove the flame-spreader. For this. Unscrew 2 self-tapping screws.

Unscrew the 6 screws fixing the upper part of the combustion chamber, and remove it.

Remove the retaining clips. On the left and right side of the heat exchanger.

Remove the old heat exchanger.

Reassembly. in the reverse order.

Now you have a complete idea of how to remove the Arderia heat exchanger. Even if you have a boiler will be a slightly different modification, and screws, for example, will be located in other places. Nothing will change in principle.

Do the same steps in the same order. You can remove the heat exchanger from the Arderia boiler and then assemble the boiler back.

How to remove the secondary heat exchanger DHW gas boiler Baxi Eco

Dismantling of the secondary heat exchanger for DHW in a Baxi Eco gas boiler

The plate heat exchanger of the Baxi Eco boiler can be easily removed with a screwdriver, as follows:

  • Close the heating water and cold water inlet valves of the boiler.
  • Drain the heating water from the boiler via the drain cock only.
  • Drain the DHW system.
  • Unscrew the two screws (right in front of you) securing the DHW heat exchanger and remove it (see Fig. Figure.).

Baxi Eco boiler is equipped with a cold water filter. To clean the filter, proceed as follows:

  • Close the tap on the cold water inlet to the boiler.
  • Drain the DHW system.
  • Unscrew the nut on the water flow sensor assembly (see Fig. Figure.).
  • Remove the water flow switch assembly with the filter.
  • Remove impurities.

In Baxi Eco boilers I also recommend cleaning the NTC temperature sensor of the DHW system and its location from limescale.

What is the heat exchanger?

The heat exchanger is an important part of the gas boiler. Its primary function is to transmit heat from the heated element to the secondary element.

There are several types of heat exchangers:

    Primary. Coils are designed from a pipe equipped with ribs to improve efficiency. When burning gas heat is released that heats the heat exchanger and circulating fluid through it. If the boiler is single-circuit, it has only the primary heat exchanger.

  • Combined or bi-thermal heat exchangers. Many modern two-circuit heating boilers have bi-thermal heat exchangers, which combine two heat exchangers in one design: for heating and for hot water (DHW).

Bi-thermal heat exchanger is also called double. In the section you can see that structurally it is a tube in a tube.

Through the inner tube flows the water of the hot water supply system, the outer one is the heating medium of the heating system

Flushing the gas boiler heat exchanger

The information we offer will help you to carry out regular preventive maintenance of single- or double-circuit gas boilers quickly, accurately and without the help of specialists. On the quality of cleaning the heat exchanger dual boiler with their own hands will not be inferior to the work of the service, the price will spend no more than 100, time maximum 2 hours. Interesting? Then read more.

A little bit of theory

The principle of operation of any gas boiler is to heat the coolant during combustion of gas. The design of the heat exchanger, through which heated to a certain temperature coolant moves, approximately the same. This is a curved tube made of copper or stainless steel, which is called the coil. When gas is converted into thermal energy, it is heated and along with it the water or any other coolant that circulates through the heating system is heated.

For heating water in the heat exchanger is responsible for a system of plates, which is externally identical to a car radiator. You can use it to increase the temperature of the water, reduce it or direct it to one of the circuits in the case of two-circuit boilers.

It is this, conventionally speaking, the radiator of the gas boiler and needs regular cleaning, or rather, flushing.

Why you should clean the heat exchanger of a gas boiler

The main material of manufacture of the coil is copper or its alloys. Both in its pure form, and as a component, copper is characterized by good thermal conductivity, but at the same time quickly enough an oxide deposit appears, which cannot be removed by non-mechanical means.

Gradually the copper oxide layer increases. Reducing the thermal conductivity and reducing the efficiency of the gas boiler. At the same gas flow rate in the house will be 15-30% colder in winter.

In need of cleaning are also the gas nozzles, through which the gas flows to the plates and heats the coolant.

remove, secondary, heat, exchanger

Experts recommend such cleaning of the heat exchanger of the gas boiler annually, but in most cases it is a preventive measure that justifies the work of the service and the cost of the operation. It is enough to clean the heat exchanger once in 2-3 years before the heating season to be sure of the proper operation of the boiler and the rational use of fuel.

It is worth paying attention to your kettle. If the plaque is significant and appears quickly after cleaning, the water is hard, and then the heat exchanger will have to be cleaned once every 2 years. If not, a 3 year break is sufficient.

Cleaning the first step

Depending on the model of the gas boiler, the access to the combustion chamber may differ. In some it is enough to remove the cover from the front side, unscrew the bolts from the combustion chamber and get to the heat exchanger, in others you have to remove sections of the rubber seal and remove the refractory walls.

Once the covers are removed, you can immediately see a mountain of debris at the bottom of the boiler, which is usually drawn in from the street. This area can simply be vacuumed and wiped off the dust and dirt that has accumulated during downtime.

Cleaning the nozzles

The nozzles are at the bottom of the chamber, and through them gas enters the boiler for combustion. Be very careful about cleaning, because the worse you do it, the more heat will go by your house. Ideally, all nozzles should become completely transparent. If cleaning is carried out regularly, it is enough to do with a soft cloth, if rarely or ever for the first time a stiff brush or a new toothbrush lubricated with regular toilet soap comes in handy. It is lubricated, so that the soapy solution does not flood the nozzles.

Cleaning the heat exchanger

To clean this assembly you need to unscrew it. Adapters are used as connectors, so there should be no difficulty. Also carefully disconnect the temperature sensor.

First of all you rinse the heat exchanger of the gas boiler from the outside. Take a deep container, pour water and any descaler. If you do not have it on hand, you can do with citric acid, but the water must be hot enough 60-70 degrees. Soak for about 40 minutes, then rinse under a high pressure of water.

It is forbidden to rub the exchanger plates with cloths, sponges or brushes. It is a soft material that is easy to crumple.

The best way to wash the boiler heat exchanger is a hand car wash, but you need to control the power of the jet to keep the plates intact.

You can not even let the top of the unit dry out and proceed directly to cleaning the insides, or rather the coil through which the heat exchanger circulates. As a rule, if the water in the room is soft, inside during the time between services does not have time to accumulate a significant amount of scale, but it can be in principle, so that the pipe should also be thoroughly cleaned. By the way, household filters do not affect the rate of scale and lime deposits.

How to wash the heat exchanger of the gas boiler

If even a household descaler can easily cope with the outer part, then to clean the inner part of the pipe you will need a more serious preparation, but also from the range of household.

Cilit for toilet bowl cleaning, which removes limescale, has proven to be a good choice. The product should be liquid and thick enough to fill the entire pipe. Then you need to wash the pipe with any decalcifying agent or the same citric acid at the rate of 30 grams per liter of water. Pour it into the pipe and leave it for a few minutes, take it out, shake it vigorously several times and then rinse it thoroughly 10 times under a large stream of water to wash out all the remains of scale completely.

In the video you can see clearly how to properly and what to clean the heat exchanger of a two-circuit gas boiler:

After that. Once you have cleaned the heat exchanger from all sides, dry it and assemble in reverse order.

For those, who decided to do cleaning for the first time we recommend to make a video or photo of the whole process. It will be much easier to assemble afterwards and there will be no unnecessary parts, as it often happens.

Connect the heat exchanger to the boiler and the temperature sensor and turn it on at full capacity. Следует проверить, насколько качественно он работает и в течение которого времени теплоноситель нагрелся.

На этом процесс окончен. Итого потрачено 62 рубля на лимонную кислоту и 2 часа времени. Для сравнения,. в Кирове от 300 до 500 в зависимости от модели котла.

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