Home Article How to replace the anode in a Hajdu boiler

How to replace the anode in a Hajdu boiler

Operation of boilers and water heaters Hajdu

Location. It is recommended to use Haidu boilers in rooms with air temperature from 5 to 45C. The place of installation should be chosen so as to have access to the inlet and outlet connections of the unit, as well as access to replace the magnesium anode.

Fixing a wall-mounted indirect heating boiler (Hajdu AQ IND FC 100, 150, 200 liters). The wall chosen for installation must be able to withstand the weight of the water-filled device, in case the wall is not strong enough it is advisable to use reinforcing plates made of metal. For replacement of the active anode, it is necessary to leave a free space of 200 mm under the bottom plate. To ensure the unit good stability after installation on the base and before filling with water it is necessary to fix it on the wall with hanging brackets.

Installation of a floor standing boiler (Hajdu AQ IND SC 100, 150, 200 liters). The vertical position must be ensured by adjusting the base. The heater should be installed so that there is a distance of at least 50 mm from the wall. In order to remove the cleaning cover inside the appliance, a space of at least 700 mm must be left between the appliance’s casing and the wall or other building elements. Provide at the place of installation appropriate electric, water and sewage networks.

Before putting the appliance into operation, it should be completely filled with water by opening a hot water tap until the water flows. Afterwards the hot water system should be flushed.

Installation with a circulation pump. This mounting method is suggested by the manufacturer. Circulation pump provides a good efficiency of the heat exchanger. The equipment is controlled through a thermostat mounted on the unit, the thermostat gives you the ability to adjust the temperature of the domestic hot water. Use of steel pipes is recommended. Before refilling, the system must be flushed out with circulating water to remove impurities.

Maintenance of the Haidu indirect water heater

In places where the water hardness is higher than average, it is recommended to descale the BCH annually (AQ IND SC/FC 100, 150, 200 models):

Fixing the safety valve leakage

If it leaks from the return (safety) valve after the boiler Haidu heated water, it indicates that there is nothing wrong with your element, the safety unit copes with its duties. the discharge of water when heated, at the moment of increasing pressure on the walls of the tank as a result of water expansion.

Water pressure in the appliance is reduced when water is drained. Put a plastic tube on the nozzle and lead it down the drain. It is important to know that not all models can drain the liquid from the boiler. In such a situation it is recommended to put a tee.

But if it happens systematically, then pay attention to this:

First of all, the node could lose its protective qualities as a result of wear. there could be an extension of the spring, or a burst disc device.

Secondly, the leak could be the result of a shock occurring when the pressure in the water system rises rapidly, for example, when you turn on the water supply after it has been turned off. In addition, in this case, all the dirt accumulated in the pipes, moving through the system at high speed, thereby clogging the protective unit. In addition, it could be clogged with limescale if it has not been cleaned for a long time. For such cases, the only solution is to install another safety valve.

Third, there may not be a proper protective assembly from the start. There is only one solution to the problem. diagnose the safety device.

Fourth, water leakage from the check valve can be the result of the desire to “hide” the safety device and the failure to meet the main condition for accurate operation. The length between the safety node and the boiler indirect heating Hajdu should not be more than two meters, otherwise the pressure increases and leaks. In such a situation the problem will be solved only by relocating the safety valve according to the recommendations.

If after replacing the safety valve it starts to leak, it is likely that its nominal pressure does not correspond to the pressure approved by the manufacturer. Another reason. it is too high temperature heating, as a result, a stable high pressure in the tank, the most reasonable temperature. 60 degrees Celsius.

There may also be excessive system pressure that causes leakage. often than not, because of the not quite good plumbing system in order to provide the upper floors increase the pressure.

If the safety valve has been installed from the beginning, considering the nominal pressure of the system and the manufacturer’s advice, when the pressure rises the valve may not be able to fulfil its purpose. The spring is adjusted to 7 bar, if the system pressure is higher the safety valve starts to leak. This problem can be solved by installing a pressure reducer with suitable parameters.

The Hajdu electric storage water heater (models STA 200 C, 300 C, 500 C, 300 C2, 200 C2) consists of a thermally insulated and enamelled tank and a plastic casing. Height adjustable between 20-40 mm by means of adjustable feet.

1) Hajdu STA 200C, 300C, 500C. With lower and upper electric heating element (lower heating element 3×1200 W or 3×1600 W, upper heating element 3000 W), built-in lower heat exchanger (coil), built-in upper heat exchanger (coil).

2) Hajdu STA 200C2, 300 C2. External bottom heat exchanger. Each equipment is provided with a spigot for mounting a contact thermometer, spigots for placing thermo-sensitive elements for controlling the operation of the bottom and top heat exchanger, as well as with a circulation spigot.

Purpose and operation of the anode in the boiler

Titanium or magnesium anodes in the water heater are needed to reduce the aggressive influence on the metal parts of the water heater that are in contact with moisture: tank, heating element.

The basic operation of the safety bars is based on the usual principles of electroplating, electrolysis. The oxidation nullification is referred to as anodic corrosion protection.

Peculiarities of the anode assignment in storage water heaters:

  • Oxidation. rust in enameled tanks affects the body at joints, seams, roundings. The special glass façade expands with the tank, but the risk of micro-cracks remains, moisture penetrates, ordinary steel corrodes quickly. In stainless steel tanks, the protector is needed because of the susceptibility to darkening and destruction in places of looseness (welding segments, seams);
  • Do not get rid of limescale, for this there are softeners, decalcifiers. But the electrochemical processes loosen, the stone is easier to separate.

Protectors must have a good contact with the protected elements (tank, heating element). You can’t place or attach the rod to the tank in any way. there is a special socket for positioning the anode in the tank.

Heating elements with a magnesium anode are most often located on a single flange, with dry heating elements are also mounted on the shell body, less often are inserted into the boiler shell separately.

Can the water heater be used without anode?

The lack of a protective anode in the tank significantly reduces the service life of water heating equipment. Tank boilers are constantly exposed to aggressive environment, enhanced thermal and electrochemical processes.

Water heater with and without anode differs in that the first has 12. 18 months. Rust, discoloration, oxidation will spoil water quality, threaten the integrity of the casing. Soon the tank will leak.

Once corrosion has occurred it does not disappear. Putting a protective bar will thin faster (if magnesium), will not always stop the process, if the potential is not enough to the damaged areas, it will only slow down. Protected boiler is not threatened by oxidation. the main cause of leaks.

With protectors, limescale, sludge, oxides, sludge are still formed. the tank must always be cleaned, but the tank and the heating element will not corrode.

Why do we need a magnesium anode and how to replace it?

People who use water heating tanks, quite often hear information about a magnesium anode, but only a few people know what this part is and what properties it has. The main function of the magnesium anode is to protect against salt deposits, which are formed due to exposure to water. This element is needed to prevent corrosion of the internal walls of the equipment.

Such a detail as a magnesium anode for water heaters, visually resembles a wide rod and is installed in the middle of the internal capacity of the system. It is fastened close to the heating element. This is so that both the electrode and the anode can be removed together when repairing or diagnosing. However, there are also designs where these parts are placed separately. You can distinguish two functions of how the magnesium anode works in the water heater:

  • Protects the equipment and parts from corrosion.
  • Makes the scale structure friable, allowing it to be removed without much effort.
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The inner surface of the equipment is contaminated by carbonates and calcium salts. The anode is not able to completely eliminate the problem, but it makes it not as serious. Due to its interaction with carbonates, it is replaced and magnesium salts accumulate on the heaters. They have a soft structure and can be removed without damaging the heating element.

In order to protect the inner surface of the boiler mechanism, a special enamel is often applied. It increases the service life of the water heater and has a beneficial effect on its operation. Boilers, treated with enamel, have these advantages:

HAJDU технологический процесс производства

  • Reliably resist decay, even if high nitrogen is noted in the water.
  • Minimize the appearance of corrosion.
  • Resistant to strong temperature fluctuations.

However, these active functions may not be sufficient to prevent rust. From here it becomes clear, why do we need a magnesium anode in the water heater? Unfortunately metal tends to rust the most in the area of welding. Paint can come off and water will enter the metal surface through cracks. In these situations the breakdown process is extremely fast. Without additional protection methods, the tank will fail in a year or two. But these changes can be prevented, that’s what a magnesium anode in a boiler is for.

There are two types of anodes: magnesium and titanium. The first variety is made of a rod, inside which there is a threaded rod made of steel. You should pay attention to the fact that the rods have different length and diameter. This is very important to consider when buying a new element, because if its dimensions are larger, it simply will not fit in the tank hole. However, there are also models in which you can place two anode structures at once.

The anode rod has a large size, its length reaches about 1 meter. For this reason, it will be difficult to replace it in a room with low ceilings. The height of the water heater reaches several meters, so it is also necessary to insert a meter rod. To facilitate the task, manufacturers have begun to produce special multi-sectional anode rods.

Also, a few years ago, flexible plastic rods appeared on the market. They are made of a plastic tube with micropores. On the inner surface of such a tube is poured magnesium granules. The main advantage of the design is the absence of precipitation. And this element can also be filled with magnesium as needed. Powder can be purchased separately.

After it became clear why the anode is needed in the water heater, we can mention the titanium variety, which has completely different functions and purpose. Titanium part is used as a supply and measuring electrode. In such cases, the current serves as a voltage source and is located outside. Adjustment takes place through external control. After a certain time, the current flow is stopped and then the titanium element analyses the condition of the internal construction area.

Such anode determines what changes have occurred during this period of time and adjusts the necessary supply in order to replenish the destruction. The titanium variety can not decompose, which means that its replacement is not required. It functions for the entire duration of the construction. In order to check and make sure that the anode is made of titanium, you need to use a regular magnet. A part of this material has a weak magnetic field and is incapable of becoming magnetic.

The titanium variety does not need to be replaced, but the magnesium anode should be changed once a year. If the device is used very often, then the part should be replaced more than once a year. This procedure is not too difficult and can be carried out by each person.

When replacing the part it is necessary to clean the scale from the inner area of the tank. This action will increase the life of the device and improve water quality. It should also be noted that the element should be replaced if such signs are present:

Step-by-step procedure for replacing the anode

First of all, it is necessary to find out where the anode in the heater and how to remove and replace it correctly. Information about this should be included in the instruction manual of your device. If this manual is not available, the following is the standard procedure for replacing the magnesium anode, which is pretty much the same for all wall mounted storage water heaters.

Step 1. Turn off the power to the water heater and the water supply

First disconnect the water heater from the mains and cut off the cold water supply to the water heater, then open the faucet. This is how we release the excess pressure from the water heater.

Then close the hot water inlet. On the cold water spigot, either on the drain pipe, or on a special outlet for draining the water, install a flexible hose (you can use a drain hose instead) and pull it to the sink.

Step 2. Drain the tank

Unscrew the hot water outlet to start draining the water. This is how we bleed air into the water heater and the water starts to flow into the sink. At the same time a few drops may come out of the hot water nozzle, but the main flow of water will go through the drain hose. This is due to the different height of the hot and cold water pipes in the water heater. The hot water spigot ends at the top of the internal tank, and the cold spigot ends at the bottom, so we drain through it, if there is no discharge spigot.

After the water has drained out, you can unscrew the drain hose. Now unscrew the American pipe on the cold water inlet, while a little more water can pour out of the tank. After that we can remove the water heater. Since the water in the inner tank is still present, albeit in small quantities, removing the water heater from the wall, it is better to clamp a hand cold water socket.

Step 3. Remove the old anode

Proceed to replace the magnesium anode in the boiler. It is necessary to unscrew the screw that holds the lid, and pick it up with a knife or screwdriver. Under the lid we will see the wires. First of all we need to remove the contacts from the heating element. To do this, we unscrew them with a Phillips screwdriver. Next you need to pull out the thermostat sensors. The number of sensors depends on the particular model of water heater.

Unscrew the nuts that fasten the heating element. The size of these nuts depends on the model of the water heater. It is better to take the bolts and nuts out after unscrewing so they don’t get lost and fall in.

Remove the flange and remove the heating element. You can see the remains of the anode on it. Rinse the heating element from the remains of the anode under running water. After flushing the water heater you will see that only the pin is left of the anode. You can also flush the water heater itself. Pour water into it and turn it over to splash out the dirty water with the remains of the anode.

Unscrew the pin remaining from the anode. Unscrew the nut and remove the old pin.

Step 4. Install the new anode

Since we have a thread in the socket of the anode, the new one can be installed without a nut. just screw it into the heating element group. It is not necessary to tighten the anode all the way. just fix it.

After screwing the anode we wipe the seat of the heating element and put the heating element back.

replace, anode, hajdu, boiler

Then assemble everything in reverse order. Return the flange and bolt it down. Be careful not to pinch the wires and temperature sensors. Do not overtighten the flange nuts. Put the temperature sensors back, and then fix them with the fixing bar. Then return the contacts of the heating element, lay all the wires and screw the lid on. After that you can put the water heater back in its place.

Step 5. Restore water flow and heat

Return the pipes to the water connections. After connecting the pipes we open the faucet and turn on the water supply to the water heater, and then open the water supply from the water heater. That’s how we bleed air from the internal tank of the water heater. Wait for the water flow to stabilize and start evenly.

After that, you can close the faucet, plug in the water heater and start heating.

What happens if the anode is not replaced on time?

The magnesium anode is “self-destructive” and will continue to corrode until there is nothing left of it. When there is no magnesium alloy left on the anode, the water heater tank can begin to rust.

Another possible problem if the anode is not replaced in a timely manner is the possibility of it breaking off and falling to the bottom of the water heater. This doesn’t seem like such a serious problem at first glance, but this broken off anode rod can bounce around inside the water heater when exposed to water. This can lead to cracks in the tank’s coating, which becomes a hotbed of corrosion of the base metal, shortening the life of the unit.

All of this explains why it is so important to regularly check and replace the magnesium anode in the water heater to extend the life of your heater.

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Magnesium anode for the boiler. why you need it, the principle of operation, replacement

About the anode in the water heater, its properties and principle of operation you need to know everything, because it affects the service life. If not changed, it has a bad effect on the duration of operation of the boiler. In this article, a master plumber will tell you what it is, what it is for, and how to make a replacement.

What is a magnesium anode, how it works

The anode represents a grayish-colored rod with a smooth surface. Usually performed in the form of a thin cylindrical element with a threaded metal stud on one end. The length of such a rod with a magnesium coating, depending on the model of the boiler, can be from 14 to 25 millimeters.

The principle of operation of the component is as follows. The anode is screwed into the threaded hole of the heating element (TEN) flange with a stud, then this pair is placed inside the boiler body. After some time of operation, the surface of the magnesium anode is no longer smooth. It has a corroded appearance. That is how it protects the walls of the boiler from destruction. If time to replace the detail, then the inside of the water heater tank will remain intact for many years.

The anode is thus a consumable component. Scientifically speaking, all of the oxidation processes that occur with multiple cycles of heating water inside the appliance, when there is a magnesium rod, affect it, but not the walls of the tank. This is due to the fact that it is the rod that has a lower electrochemical potential.

How to determine if the part needs to be replaced

Visually and by ear during the use of the boiler to determine whether it is time to replace the magnesium anode installed inside, you can determine the following signs:

  • The boiler takes much longer to heat up;
  • The device often turns off and on again;
  • Leaking from the faucet hot water became cloudy, with an unpleasant odor;
  • Noises can be heard during the operation of the water heater tank.

If at least one of the above signs is present, you should think about replacing the magnesium anode. an inexpensive consumable element that can act as a “victim”.

The process of replacing the magnesium anode in the boiler is quite simple. Anyone can remove the old anode from the water heater and install a new one in its place, even without special skills. But when carrying out this procedure, you should take into account that each manufacturer has its own modification, respectively, you should buy only the original component. Therefore, in this regard, it is better to give preference to a visit to a service center or a specialized retail outlet.If you do not know what to replace the old one, take it to the store. The part must be chosen according to the thread diameter. For example, in the Thermex Flat Plus model the number is M4.

The procedure consists of several intermediate steps. The first step is to disconnect the boiler from the power grid and drain it of all liquid. The check valve can speed up this procedure, but it is wise to connect the hose beforehand, so as not to splash everything around.

In the next step we unscrew the cover that is located on the bottom of the tank. After that the thermal sensor and the flange will be visible. The last two also have to be dismantled.

Next steps: by gently wiggling pull out the heating element. Because the heating element is covered with saline deposits, there can be some difficulties at this stage, so proceed carefully in order to avoid damaging the part.

The next step is to remove the old anode, located next to the heating element. Often only an empty pin is found, which is a clear demonstration of magnesium degradation. In any case, the part should be removed from the socket.

Before installing a new magnesium anode, it is necessary to perform such a procedure as descaling. For this purpose, you can use an ordinary screwdriver.

If the plaque is too hard and it is not possible to remove it mechanically, citric acid is a good option.

  • In 1 liter of clean water dissolve 40-50 grams of citric acid;
  • The heating element is placed in the resulting mixture for about 48 hours;
  • After two days, the heating element is taken out, washed.

In the last step, after completing all the above steps, the boiler is assembled back into working order. The next step is to check the device for proper operation.

When the water heater is ready for operation again, the tap is opened and the tank is filled with cold water. Thus the crane, from which the hot liquid flows out, should remain open. When water flows out of the anode it indicates that the boiler is full. Do not turn off the “hot” water tap at once: you must let the tank and pipes flush and get rid of the dirty liquid.

When the water leaking from the faucet is completely clean, close the tap. After this the boiler should be allowed to stand for at least 30 minutes. In this way it is possible to get rid of condensation accumulated on all surfaces. It is also necessary to make sure that there are no leaks at all.

Why do we need a magnesium anode in the water heater: features and purpose

Various impurities that are in the water, when heated, interact with the materials from which the tank and other parts are made. This causes the formation of oxides that destroy the parts of the equipment. A magnesium anode is needed in the water heater to prevent galvanic vapor from forming in the boiler. This is possible because magnesium reacts with salts dissolved in water.

Reactions taking place inside the tank affect the electrode, while the walls of the body remain untouched. In addition, the formation of carbonic acid makes the scale loose, which facilitates its easy removal at the time of cleaning or repair. The anode in the boiler thus performs a protective function.

Mainly, the electrode increases the energy efficiency of the water heater operation. It reduces the formation of scale on the heating element, which leads to faster water heating and electricity savings.

The rod gradually wears out with prolonged use. The level of impurities in the water is not reduced at the same time, the device is not able to fully cope with its duties. That’s why the magnesium anode in the water heater needs to be checked regularly and replaced if necessary.

Important! The more a water heater anode is used, the faster it wears out. When buying a new electrode, you should pay attention to its quality. If the coating is made of low-quality magnesium, the element will fail faster, and the water will acquire a hydrogen sulfide odor.

How does a magnesium anode work in a water heater?

Magnesium is a divalent element of the chemical system, which has the properties of actively reacting with salts, oxygen, iron. At the same time, the metal reduces the rate of calcium carbonate formed on the walls inside the tank, and magnesium itself turns into carbonic acid. It makes the scale loose, which simplifies the process of cleaning the heating element from it.

Magnesium or titanium anode for the water heater. what do you need

It often happens that the owners of water heaters comes time to clean the tank from scale and corrosion, it is necessary to do the replacement of the anode. But what is an anode, one does not know. In this article, the master plumber will tell you what it is and in general, why it is needed in the water heater.

To begin with, let’s understand that the anode is an element of the boiler in the form of a thick rod of metal (magnesium or titanium).

The main material that is used for the production of the internal tanks is stainless steel (iron alloy with carbon). When heated oxygen in water begins to emit and interact with the steel container. After everything begins to form oxide.

In order to protect the inner surface of the water heating structure, protective enamel is used. It makes the life of the enamel longer and at the same time safer.

  • Resists decay in any water, even sea water or with m nitrogen compounds;
  • Inseparable from the metal, and it prevents the formation of corrosion under the coating;
  • Does not age, it is wear-resistant;
  • The enamel is resistant to temperature fluctuations;
  • Not toxic and hygienic;
  • Enamel is biologically neutral (it is not the best environment for bacteria reproduction);
  • The coating technology is such that it is possible to apply the enamel in containers of any size.

To prevent the appearance of rust on the tank, install anodes. magnesium or titanium. They are fastened by means of a threaded part with a heating device.

From the anode itself a current flows to the damaged area. Thus, due to the decay of the more active material, corrosion does not appear.

Note! The anode, which is built into the tank, consists almost entirely of magnesium, so it is sufficient to check the construction once a year. Inspection is necessary to observe, because due to poor quality water, the service life of the product may be reduced

Magnesium and iron come in contact with water, but magnesium is more active than steel. Magnesium atoms leave the anode and produce oxide. Thus the steel atoms remain untouched and the tank does not corrode. That’s the whole principle of its operation.

How to Replace the Anode in a Water Heater | Repair and Replace

Magnesium anode for the water heater has a low price, and its use will be quite effective. When interacting with such a rod, the salt will not disappear, but simply remain on its surface.

The work of the anode with a titanium coating is slightly different. In this case, the current is supplied by an external voltage source. Stable current, which is necessary to prevent corrosion, is supplied and regulated by an external electronic control. The active anode functions as a supply and measuring electrode.

From time to time the power supply is cut off. During these minutes, the anode analyzes the condition of the inside of the structure for damage, and accurately adjusts the strength of the current to restore.

Note! When operating the water heater with a titanium anode is not subject to destruction, so it does not need to be replaced throughout the life of the heater

You already know how often the anode in the water heater needs to be replaced: the titanium one does not require replacement during the whole time of use, but the magnesium one should be checked on average once a year. When using the appliance frequently. more than once a year.

In the process of replacement, it is also worth removing scale from the inner surface of the tank and heating element. This will prolong the life of the heating device and improve the quality of water.

Now let’s look at how to change the magnesium anode in the water heater with your own hands. No matter what manufacturer’s device you purchased, the cleaning process will not differ dramatically.

It is worth saying that the replacement of the anode in the water heater should take place, if there are the following signs of a contaminated electric tube heater:

  • The boiler switches on and off more and more often;
  • There is a slight hiss when working;
  • Water heats for a long time, or does not heat at all (because if the heating element is covered with a layer of lime, it takes more time and electrical energy to heat the liquid).


The anode for the water heater is a thick rod installed in the middle of the capacity of the equipment. It is attached very close to the heating element. This is done so that both the anode and the electrode can be pulled out together in case of repair or inspection. However, there are also some models in which these are installed separately.

The anode has two functions in the heater. The first purpose, which is considered the main. is to protect the device and some elements from corrosion. The second purpose is a kind of bonus: it makes the scale on the heating element very loose, which means that it is much easier to remove from the surface.

Mostly calcium salts and carbonates contaminate the surface of the heating element. Magnesium anode can not fully protect it from this, but still makes the problem not so terrible. When the anode and the carbonates interact, it deposits magnesium salts on the heater itself as a result of the replacement. They are characterized by a very soft structure. Therefore they can easily be removed mechanically without damaging the heating element.

Very often in order to protect the internal surfaces of such structures in the creation of a special enamel.

It significantly extends the service life, and also makes the water heater much safer. Boilers with enamel coating are considered of higher quality than their competitors and last longer. These models have several advantages, such as:

  • the ability to resist decay even in water with m nitrogen;
  • the coating is inseparable from the metal with which the heater is finished, which prevents the formation of corrosion on the surface;
  • The enamel is resistant to sharp temperature fluctuations.

However, to protect against rust, it is still not enough. This is where the anode comes to the rescue. It would seem that why do you need an anode in the heater when it has excellent protection without it? But the metal will rust in any case, especially in welding areas. The paint can also, over time, covered with small cracks, and then the water through them will get to the metal surface. In this case, the destruction will come very quickly. Therefore, without additional protection, such as a magnesium anode, the tank will already fail in a few years. As a result of prolonged operation, it may show traces of corrosion, but this is not terrible, because the water heater tank will remain unscathed.

Install a sacrificial anode for the boiler, covered with ordinary metal, it is necessary. After all, this material without additional protection has a short life. Even if the tanks inside are covered with a layer of stainless steel, it still will not save the water heater. Therefore, you need to buy additional parts, so that then do not spend money on repairs. Any manufacturer of the heater puts forward its recommendations on how to choose the size of the anode. In principle, anodes can be divided into two types. magnesium and titanium.

Magnesium anode

Magnesium anode, as mentioned above, is made of an ordinary rod or, in other words, a rod, inside which there is a steel rod with a thread. The studs themselves can be different diameters and different lengths. It is worth paying attention to this when buying a new anode, because if its size is several times larger, it will not fit in the tank opening. However, there are some designs where you can install even two anodes. In floor gas or electric designs with a large volume, they are only changed from above.

The anode rod is very large, approximately one meter long. Therefore, its replacement will be problematic in rooms with low ceilings. Since the water heater itself has a height of up to two meters, plus it must also be inserted a meter rod. For such purposes began to produce multi-section protective magnesium anodes.

Since development does not stand still, then recently in the markets appeared new items. these are flexible anodes made of plastic.

They are made of a plastic tube that has micropores. Magnesium granules are poured inside this tube. The advantage of such a novelty is that no deposits remain inside. In addition, magnesium can be added to the tube as it is produced. Magnesium powder is sold separately.

A quality aluminum water heater does not need such additions. But the high price makes it unaffordable for ordinary consumers. But a conventional boiler, complete with a magnesium anode, will be affordable to almost everyone. At the same time, in terms of functionality it is not worse. The principle of its operation is that the active magnesium atoms leave the anode, and themselves produce oxide. The iron atoms are left completely intact.

How to change?

Magnesium anode is a consumable part, so it must be periodically replaced. Such a process will not take much time or effort. Anyone can replace the anode with their own hands. You can buy it at any service center or specialized store. Anode replacement involves several steps.

  • It is necessary to disconnect the water heater from the network and drain the water. To be faster, it can be done through a check valve. But it is worth putting on a hose so that you can control the water flow, otherwise everything around you will get splashed.
  • Remove the casing from the bottom of the heater. After this process, the temperature sensor and flange will be visible; they must also be removed.
  • Gently wiggle and pull out the heating element. This is not so easy to do, since it has already deposited some formations. That’s why you have to make some effort not to damage it.
  • The next step is to remove the old magnesium anode, located next to the heating element. Very often in the place of a complete anode you will find only an empty pin. These are signs that the magnesium layer is breaking down. But you still need to remove it from the socket.
  • At the same time it is necessary to clean the fuel element of scale, and only after that you can install a new anode. Cleaning the heating element is best done while it is in operation, before the buildup is too hard. It can be removed with an ordinary screwdriver. If it does harden, you have to dissolve it in citric acid. The proportions should be as follows: fifty grams of acid per liter of water. The heating element should be kept in this solution for two days.
  • After that the boiler is carefully assembled in its original state.

As you can see from the above, changing the anode is not that difficult. You just need to remember to watch for bacteria, and clean the surface of the tank inside the water heater. And also change the anode should be regularly. All this will help increase the life of the water heater.

How to replace the magnesium anode with your own hands

Consider how to unscrew the parts yourself:

  • Unplug the appliance. Disconnect automatic switcher, if contacts lead to it.
  • Drain the water. The fastest way to do this is through the check valve. Turn off the water on the main valve, unscrew the water hoses and twist the check valve.
  • In Gorenje models the magnesium part is located on top. To avoid removing the boiler from the wall, simply lift the top cover. If this is not possible because of the proximity to the ceiling, you have to remove the housing.
  • On other models, you have to remove the bottom cover. To do this, unscrew the fastening screws and remove the latches.
  • If the heating element is fixed on the flange, unscrew the nuts and screws, take out the flange. Sometimes you need to push the heater in first and then take it out of the tank.

How to choose a new element? If you do not know what to replace the old one, take it to the store. The part should be selected according to its thread diameter. For example, in the Thermex Flat Plus model the number is M4.

Reverse the installation procedure.

How to extend the life of the water heater

Monitor the operation of the boiler to detect and fix the problem in time:

  • A hissing sound is heard when taking in water? It means that the heater is covered with limescale. It is necessary to perform its cleaning.
  • It is advisable to install water filters. They reduce the concentration of impurities that later settle on the parts.
  • Occasionally look under the lid of the body to check the condition of the anode. If it is half worn out, you will need a replacement soon.
  • If you have removed the old element, but have not had time to install the new one, do not run the technique. Buying a new element is cheaper than buying a new boiler.
  • The frequent use leads to a rapid formation of limescale. Therefore it is recommended to clean the tank once a year.

You have made up your mind to replace it yourself? Be sure to unplug the heater and drain the water. Then proceed to the repair. A video on replacing this part in the boiler will help you:



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