Expansion tank for cold water: advantages of use. How to choose an expansion tank for water supply systems? How to choose a membrane tank for water supply

Consumption ecology. Manor: An autonomous water supply system that has already become familiar to many will uninterruptedly perform its functions for a long time only when an expansion tank is present in its design. This fairly simple multifunctional device is available in various modifications. To choose the right equipment for your system, you need to accurately understand the principle of its operation and understand the main types of devices.

An autonomous water supply system that has already become familiar to many will perform its functions uninterruptedly for a long time only when an expansion tank is present in its design. This fairly simple multifunctional device is available in various modifications. To choose the right equipment for your system, you need to accurately understand the principle of its operation and understand the main types of devices.

Consider the design of the device. Most often this is a closed membrane type device. A rubber membrane divides the container into two chambers. The first contains air, the second contains water. Once activated, the pump starts pumping liquid into the water chamber. It fills up and compresses the air. The amount of air in the tank decreases and the pressure increases. At the moment when it reaches the set value, the pump is switched off.

As the water from the tank is consumed for household needs, the volume of the chamber filled with air increases, and the pressure drops accordingly. Upon reaching the minimum allowable value, the pump starts up again. The cycle automatically repeats. The operating pressure range is selected by the user, the device settings are extremely simple.

The tank can be equipped with a pressure gauge, which will allow you to monitor the pressure in the system. The device performs several functions:

Protects pumping equipment from rapid wear by preventing frequent switching on/off of the device.
- Saves a certain amount of water, which allows you to use the water supply for some time after a power outage.
- Protects the water supply from water hammer, which can occur if air enters the pipeline or during power surges.

There are two types of expansion tanks on the market. The first is equipment with a stationary diaphragm rigidly fixed inside the tank. This greatly simplifies the design of the device and reduces the cost of its production. But at the same time, a rigidly fixed diaphragm also has disadvantages. First of all, the liquid contained in the water chamber comes into contact with the walls of the tank. This can lead to rapid corrosion of the container. Despite the fact that the inner surface of the device is coated with a special protective composition, it is rust that causes the device to fail.

Another disadvantage is the inability to replace the membrane if necessary. As soon as it deteriorates, the device will have to be replaced.

It must be admitted that the service life of this type of device is short. Expansion tanks with a replaceable diaphragm are more durable and reliable. An element that has served its purpose is easily changed to a new one through a special flange, which is located on the device body. A little differently, everything happens with large-sized devices. The membranes of such tanks are additionally fixed to the nipple with the back, which must be taken into account when changing the diaphragm.

An advantageous feature of tanks with a replaceable membrane is that water is poured into the rubber diaphragm. Thus, its contact with the tank walls is impossible, which reliably protects them from corrosion. In addition, pollution cannot enter the water, and it remains clean. Thus, the service life of this type of membrane tanks is much longer, but the cost is also higher. Both modifications are produced in horizontal and vertical versions.

The main characteristic of the membrane tank, which determines the choice of device, is its volume. On average, it can vary from 20 to 100 liters. The main rule: the capacity of the device should be enough to meet all the household needs of the owner of the house. Therefore, when determining the volume of a membrane tank, the following factors must be taken into account:

Number of water points. In this case, not only taps and shower heads are considered, but also those using water Appliances such as a washing machine or dishwasher.
- The number of residents who will use the water supply.
- The manufacturer's maximum number of pump starts and stops per hour.
- The probability of simultaneous operation of several water points at once.

When choosing the right volume of a membrane tank, you need to take into account a few more points. The smaller the capacity, the more often pressure surges will occur inside the system. In addition, pumping equipment will turn on / off much more often than when working with a large tank. Therefore, ceteris paribus, it is worthwhile, if possible, to choose a larger expansion tank.

If during operation it turned out that the capacity is small, you can install an additional tank. In this case, no dismantling work is required, new device installed next to the current one. After its installation, the size of the tank will be determined as the total volume of both tanks. When buying, you should not try to save as much as possible, it is better to purchase a quality device from a reputable manufacturer.

If a model with a replaceable diaphragm is chosen, it is worth asking about the cost of consumables. Some not the most conscientious manufacturers offer them for a clearly inflated price, which is very unprofitable.

A membrane tank is a necessary element of an autonomous water supply system. Its installation allows you to make the operation of the water supply system long, comfortable and uninterrupted. published

The heating system of a private house (as well as water supply) must be functional and reliable. If during installation any violations were made or something was not done, then it will not last long, even if it works for some time. One of the main elements in any autonomous system related to the use of water is an expansion tank for water supply, the selection, installation, installation of which will be discussed in this material.

What's this?

Even the name itself speaks for itself - an expansion tank is needed to expand the entire heating circuit of the house or water supply pipes through which hot or cold water flows. The fact is that during heating, the liquid increases in volume, and the pipes through which it flows do not change their physical parameters - their elasticity tends to absolute zero. This means that the pressure inside the pipes and the entire installation will increase, which can lead to damage - so-called water hammers occur, and as a result of them - the destruction of individual elements of the installation or circuits from pipes. This applies mainly to the heating system, but it also fully relates to hot water supply.

To avoid water hammer, the engineers came up with the idea to include in the system a small reservoir filled with air, that is, the substance that, unlike water, is compressed. And if the pressure in the pipes increases during the heating of the water, then thanks to this tank it will increase very slightly. "P , you can read in our article".

On a note! Expansion tank often installed in other systems, but the purpose of its use is the same - to reduce pressure in pipelines and the risk of air locks.

Another such tank is sometimes used to create a reserve stock cold water and ensures the supply of liquid to any place in the system in a matter of minutes. At the same time, the average volume of the container is about 30 liters.

For a system that provides a house with water, tanks equipped with membranes are most often used. This is a relatively small container, inside which there is a diaphragm made of an elastic material and dividing the device into two parts - with air and airless, or rather, water. When the water supply system is operating, the water chamber is filled with liquid and, acting on the membrane, compresses it, reducing the volume of the air part, increasing the pressure in it. As soon as the pressure reaches a certain level, the pump that pumps water will stop. And its inclusion occurs when the pressure drops to the minimum values.

On a note! The pressure inside the system allows you to monitor the pressure gauge installed in it.

Such a tank allows you to ensure the uninterrupted operation of the water supply system and a steady flow of water in any house, even in a multi-storey one.

Types of tanks

Expansion tanks are of two types - closed and open. They differ from each other in design features.

Table. Types of expansion tanks.

Type of

Description

This is a tank that has just a membrane separation between the compartments - water and air. The diaphragm in it is heat-resistant and avoids corrosive activity. Such a tank is airtight, outwardly it looks like a small cylinder or a ball of metal. This element of the system serves for a long time, and if the membrane is damaged, it is easy to replace it with a new one. Also, in addition to this type of expansion tank, a pressure gauge and safety valve Together they form a security system.

Such a tank is a container at the bottom of which there is a threaded connector, which allows you to combine the device with the system. It is necessary to install this design in the highest part of the heating system. It is used extremely rarely, as it has a lot of drawbacks - this is an increase in the risk of corrosion in pipes, and fairly decent dimensions, and a quick failure at critical pressure indicators. The liquid level indicators in such a container also directly depend on how much water is in the heating circuit.

Membrane tanks, in turn, are divided into two types - with a replaceable diaphragm and with a stationary one. The replaceable membrane speaks for itself - if necessary, it can be easily changed by removing it through a flange fixed with a few bolts. An expansion tank of this type serves as long as possible, and the shape of the body can be both vertical and horizontal, which makes it possible to select a container for a specific room.

Attention! In large expansion tanks, the membrane is additionally fixed with a nipple.

In containers with a stationary membrane, this part cannot be replaced - it is tightly attached to the walls of the housing. In case of failure of the unit, it is completely changed. By the way, water in such an installation, unlike the previous type, is in contact with the metal of the tank, as a result of which a corrosion process occurs on its inner surface. Installation can also be both vertically and horizontally oriented.

Expansion tanks are not only mounted, but also floor. They can also have a flat shape, differ in color: blue are for cold water, red for hot water.

Popular Models

Now on the market huge assortment various expansion tanks from various manufacturers. Models differ from each other in quality, size, shape and even color, although they are similar in principle to each other. Choosing a tank for a specific water supply system will not be difficult. You should pay attention to the models of tanks from the following companies - Russian "Dzhileks" and Italian Elbi, Aquasystem, as well as Refix (Reflex), Zilmet. , you can read in our article.

The advantages of Gileks tanks are the complete absence of the risk of air jams in the system and the absence of water-air contact, due to which liquid evaporation is excluded, and rust does not damage the pipes. The brand produces tanks of various sizes - from 6 to 700 liters. The disadvantage of containers is that only installations with a volume of more than 24 liters have removable membranes. By the way, the diaphragm is made of high-quality EPDM - ethylene-propylene-diene-rubber. Tanks "Dzhileks" are economical, durable, inexpensive, but at the same time reliable and can have different shape.

Elbi tanks have it all Required documents, including a certificate of conformity and a sanitary and epidemiological conclusion, which allows them to be safely used in residential buildings. There are vertical, horizontal, and also for sanitary water. Vertical tanks belong to the AS / AC series and have interchangeable diaphragms, they can be of different volumes - from 5 to 25 liters - and are used in domestic water supply systems, as well as in irrigation systems and other installations that do not need powerful water pressure. The membranes inside the containers are made of EPDM, working temperature ranges from -10 to +99 degrees. The tank is protected from corrosion by resistant paint.

Elbi tanks of horizontal installation are of the AFH series and have replaceable membranes. They have more capacity than the previous series - from 25 to 100 liters of water. Such installations can already be applied to small industries. The tanks are made of durable steel and have a special platform for mounting the pump.

Refix tanks are suitable for use in both technical and drinking water systems and are excellent hydraulic accumulators. All parts that come into contact with water are protected from rust, and the liquid is perfectly stored inside the rubber bulbs. Models DD, DE are designed for water saving applications in drinking water systems, ideal for use in environments with increased level rust formation. The tanks of the DE series have a bulb, which is only replaceable in models with a volume of more than 50 liters. The models of the HW series, designed for individual water supply systems, also have feet for installation on the floor and a place to mount the pump.

The international company Zilmet has been holding a high position in the equipment market for more than 50 years, and in Europe it is considered the largest manufacturer of expansion tanks. Their Hydro-PRO devices are used to work with any water in various types installations. The equipment is made of durable and high-quality carbon steel, and special internal MIG welding is used in the production, thanks to which it is possible to avoid damage to butyl rubber membranes. The inside of the tanks are coated with high-strength powder resin, which prevents rust from prolonged contact with moisture. Operating temperature range - from -10 to +99 degrees.

Aquasystem tanks have replaceable membranes and come in various volumes - from 8 to 50 liters. The maximum coolant pressure is 0.5 MPa, and air - 0.15 MPa. The operating temperature range of the equipment varies from -10 degrees to +110. Tanks are made of black steel, painted powder paint.

Attention! Don't be fooled by cheapness! As you know, a miser pays twice. The point is that the use quality equipment can lead to serious damage not only to the expansion tank, but also to the system itself, and repair will cost much more than buying high-quality equipment right away.

With regard to the quality of the equipment, Special attention pay attention to the rubber from which the diaphragm is made. Good rubber is not only a guarantee of a long service life of the equipment, but also the safety of those who will use water from a water supply system equipped with a tank.

The choice of accumulator

When choosing an expansion tank, you should pay attention to its characteristics, the materials from which it is made. Be sure to evaluate the material from which the pear or diaphragm is made, its strength and quality, compliance with all hygiene and sanitary standards, allowable temperatures use. The durability of the work will also depend on the correct choice in accordance with the operating conditions.

Important point when choosing equipment - the correct selection of the required volume of capacity. This will prevent the number of pump starts in the system, which will extend its life. You can calculate the correct volume for the cold water supply system using the formula:

Vt = 16.5*(Qmax/a)*((Pmax*Pmin)/((Pmax – Pmin)*Pprec)),

Qmax is the maximum water consumption (l / min.);
a - the optimal frequency of switching on the equipment for 1 hour (varies from 10 to 15 and is indicated in the pump passport);
Pmax and Pmin are values (measured in bar) that show the pump on and off pressures (pressure switch settings);
Pprec (bar) - an indicator of the initial pressure in the cavity with air inside the expansion tank (should not be more than Pmin; on the contrary, it is set 0.5 less than Pmin).

Note! When calculating according to this formula, 1 is added to all values. And the value of the tank volume Vt obtained by the formula is always rounded up.

For hot water supply systems, the volume is calculated differently:

V = 0.0221*C / (1-((Pi+1)/(Pf+1)),

C is the total amount of water in the water heating system;
0.0221 - indicator thermal expansion, in the range of 10-60 degrees equal to this figure;
Pi is the pre-injection pressure indicator of the expansion tank;
Pf is the pressure indicator when the safety valve is bled.

The volume of water used, in turn, is affected by the number of people living in the house, the number of points of water use (faucets, washing machines etc.), the possibility of including several such points at once.

Attention! If you use a tank of the wrong size (with underestimated values), then soon, due to a heavy load, it will begin to leak. Fortunately, with an increase in the number of people living in the house, and hence the load on the equipment, you can install an additional tank without removing the already installed one.

The value of the expansion tank for water supply in an autonomous system

To date, an autonomous cold water supply system for a private house or summer cottage has become quite widespread and is no longer a novelty for anyone. And all because these devices have proven their reliability and effectiveness in practice, however, it should be noted that to maintain them in working condition, special mechanisms are needed, about which the so-called "unenlightened layman", that is, a person who throughout his life used exclusively centralized water supply at home without even realizing it.

Take at least into account the fact that the operation of an autonomous water supply system for a private house or cottage will be able to function for a long period of time only when an expansion tank (special tank) for water supply is included in it (they are just talking about and go) - its required volume (100, 200 liters or less) will be selected individually. Now it is possible to purchase any suitable model without any difficulties, however, in order to purchase a suitable model, you still need to have general ideas about the types of equipment and clearly understand the principle of operation of this device.

In addition, choose suitable option capacity is only a smaller part of the matter - the greatest difficulty is connecting the expansion boiler to an autonomous system.

How does the expansion tank work and how is it arranged (regardless of the volume of the special tank - 100, 200 liters or less)?

The main function of this device is to maintain pressure in the system that supplies water to a private house or cottage. In most cases, water supply is used closed devices membrane type. Rexpansion tank for water supply of this type -This is a container with a rubber membrane built into it, which, in turn, divides the expansion (storage) tank, regardless of what the volume is - 100 liters or less, into two cavities - one of them will be filled with water, and the second - with air . After the system is started, the electric pump will fill the first chamber. Naturally, the volume of the chamber in which the air will be located will become smaller. According to the laws of physics, when the volume of air in the tank decreases (again, regardless of whether the volume of the tank is 100 liters or less), the pressure will increase.

When the pressure reaches a certain level with a subsequent increase, the pump turns off automatically. It can only be activated again if the pressure falls below the set value. As a result, water will begin to flow from the water chamber of the tank (separate container). A similar mechanism of action (its constant repetition) is automated. The pressure indicator is controlled by a special pressure gauge, which is installed on the device. It is possible to change the initial settings.

The main functions of an expansion tank built into an autonomous water supply system (as a special container) are as follows.

A membrane expansion tank (special container) installed in the water supply system of a private house or cottage performs several functions at once:

Ensuring stable pressure in the event that at a certain moment the pump does not function.
The tank protects the water supply system honest home or giving from a likely hydraulic onslaught, which may occur due to a sharp change in voltage in the network or if air enters the pipeline.
Saving under pressure a small (but strictly defined) amount of water (that is, this device, in fact -storage tank for water supply).
Maximum reduction of wear of the water supply system of a private house.
The use of an expansion tank allows you not to use the pump, but to use the liquid from the reserve.
One of the most important purposes of this kind of devices (in this case we are talking exclusively about membrane expansion tanks) is to ensure the supply of maximum pure water residents of a private house.

Varieties of expansion (membrane) tanks

There are two main types of these containers.

Expansion tank with replaceable membrane. As the name implies, the main characteristic feature is to replace the membrane, which provides certain advantages. Its recess is carried out by means of a special flange, fixed with several bolts. There is some nuance - in devices designed for a large volume, in order to stabilize the membrane, it is fixed to the nipple. In addition, the liquid that fills the tank is present inside the membrane and does not interact with inside devices - in turn, this property makes it impossible for metal corrosion and deterioration of water quality. Naturally, thanks to this feature, tanks with a replaceable membrane function much longer. It should be noted that such devices are made in both horizontal and vertical versions.
storage tankequipped with a fixed diaphragm. Naturally, such models are inferior to the above devices in a number of parameters. Firstly, due to the fact that water comes into direct contact with the inner wall of the tank, metal corrosion and water pollution occur. The membrane, if it fails, cannot be replaced -storage tankyou will have to buy a new one (the difference in price is very noticeable). Some models are covered from the inside with special moisture-resistant paints, but they do not provide any protection at all. There is also a horizontal and vertical type of device.

How to make a competent choice of an expansion tank?

No matter what, dominant technical specifications when choosing an expansion tank, this is its volume. And already the need for a certain amount of volume is dictated by a wide variety of conditions:

Approximate figures given by leading experts as an example:

The most common average family, which includes no more than three people, needs water supply, the pump capacity does not exceed 2 cubic meters. m / h, then the most reasonable choice would be to purchase an expansion tank with a capacity of 20 to 24 liters. With an increase in the number of consumers to eight people, it is worth purchasing a device with a volume of less than 50 liters. There are more than ten consumers - you need a storage tank of at least 100 liters. These are the most optimal values - and not a lot, and not a little. In the event that you are in doubt - it is better to take with a margin, a little more - this certainly will not damage your autonomous water supply system in any way.

Important! When choosing an expansion tank, it is necessary to take into account the need for a reservoir for storing a certain amount water.

Manufacturer brand selection

Remember the most important thing: the water supply system is not something you can save on. In the event that you purchase a low-quality expansion tank (even if at a bargain price), then you should understand that you risk being left without water supply at all for an indefinite time and with the need for very significant financial costs that differ from the difference in the cost of these tanks for a couple " zeros." As you probably already understood correctly, the costs will be associated with the repair of a water supply system that has failed due to the poor quality of the expansion tank.

Particular attention should be paid to the quality of rubber - the main component of the membrane (this component affects not only the durability of the device, but also the quality of the supplied water).
As a reliable manufacturer, we can safely recommend the following brands: Elbi, Reflex, Zilmet, Aquasystem.

A few words about how to install an expansion

According to the connection method, it is customary to separate horizontal and vertical tanks. The choice in this case (regarding only this parameter) is based on which device will be easier to place in the room allotted for it.

Expansion tank placement tips:

Ensuring unhindered access. It's too much important device to simply forget about it.
2. It should be ensured that the diameter of the water pipe that will be connected to the tank is not less than the diameter of the branch pipe.
To avoid electrochemical corrosion, the device must be grounded. Before you do this, be sure to consult an electrician.

Conclusions on the choice and application of this device

An expansion tank is a mandatory component that is part of a completely autonomous water supply system. It is entrusted to him a large number of tasks: ensuring the proper level of pressure, protection from premature wear and saving a certain supply of fluid. It should be noted that all these tasks will be completed only if the device is correctly selected and correctly connected. This is the reason why you shouldn't self-assembly autonomous water supply system - it is much more reasonable to entrust this work to professionals.

Today it is difficult to surprise anyone autonomous water supply. Such a system is very convenient and practical, but for its smooth operation, additional devices are often used, which a common person may not even guess. One of these elements is an expansion tank for supplying cold water. In today's water supply market, there are many various models such products. Therefore, in order not to make a mistake in choosing such a device, you need to understand what the principle of its operation is based on.

Design features and functionality

The main purpose of expansion tanks is maintaining a stable pressure level in an autonomous cold water supply system. Most often used in water supply systems membrane device closed type.

Such a product resembles a tank, inside which a membrane is mounted, made of rubber and dividing it into two separate chambers for air and water. After starting the system by means of an electric pump, the water part of the tank is filled. In turn, the air chamber begins to lose its volume. The less air left, the more pressure builds up.

At the moment when the pressure in the air chamber exceeds the set parameters, there will be automatic shutdown pumping equipment. In turn, the pump will turn on only when the pressure level in the expansion tank drops below the minimum value. In this case, the cycles of starting and stopping the equipment occur automatically.

For convenience, many models of expansion membrane tanks equipped with a pressure gauge for pressure control. Also, modern devices have the ability to adjust the operating range to the parameters suitable for the consumer. Installing an expansion tank in a cold water supply system provides for the following functions:

maintaining a predetermined pressure level when the pump is idle;
protection of an autonomous water supply system from unforeseen water hammers, which can be provoked by a voltage drop in the power supply network or the formation of air locks in the pipeline;
maintaining a certain volume of water under constant pressure;
additional protection of the pump against wear.

The installation of expansion tanks for cold water supply allows for low consumption water resources, generally do not use pumping equipment, but to cover the demand due to the liquid accumulated in the reservoir.

Expansion tank with removable membrane

Basic distinctive feature such equipment is the ability to change the membrane as it wears out. To do this, it is simply removed through a special flange device, fixed with several bolts. At the same time, it is important to take into account that in tanks of large volumes, in order to stabilize the membrane, it is additionally attached with the back side to the nipple.

Another feature of such a product is that the liquid entering the tank, located inside the membrane, which prevents contact with the inner walls of the tank. Due to this, the metal of the device body remains protected from corrosion, which significantly increases its operational life. At the same time, models of both vertical and horizontal types are presented on store shelves.

Expansion tank with diaphragm

A feature of such a device is the division of the tank into two separate tanks using a rigidly fixed diaphragm. Therefore, in the event of its failure, you will have to change the entire product as a whole. In such a container, in the part with liquid, there is direct contact of water with the metal case of the device, which leads to the formation of corrosion.

To solve this problem, the internal walls of the device are opened with special dyes. However, such protection is short-lived and after a while rust still appears on the case. As well as expansion tanks with a removable membrane model with a diaphragm, they are vertical or horizontal.

How not to make a mistake with the choice of the device?

First of all, when choosing expansion membrane tanks for cold water supply, their volume must be taken into account. In addition, we should not forget about the following factors affecting basic parameters of the device:

According to the advice of experts, the choice of an expansion tank for cold water supply should be based on the following standard indicators:

if the family uses water in the house no more three people, and pumping equipment produces 2 cubic meters. meters of liquid within an hour, it is better to give preference to tanks with a volume of up to 24 liters;
if from 5 to 7 people live in private or suburban housing construction, and the pump delivers up to 3.5 cubic meters. meters for an hour, an expansion tank of 50 liters is mounted;
if the number of residents exceeds 10 people and a powerful 5 cubic meters pump is installed, then it is advisable to use an expansion tank with a volume of 100 liters.

In the process of choosing suitable model expansion membrane tank for supplying cold water, it must be taken into account that the smaller the size of the tank, the more often the pumping equipment is turned on and off. Also using a small tank leads to sudden pressure drops. in the water supply system. Plus, such a device should accumulate a certain supply of water resources. Only on the basis of these parameters it is necessary to select the volume of the expansion tank.

You should also be aware that in most tank designs it is possible to install additional water tanks. At the same time, all improvements can be carried out without interrupting the operation of the main water supply system. After installing an additional tank, the total volume of the tank will be the sum of the used tanks.

Apart from technical parameters when choosing an expansion tank for cold water supply, you need to pay attention to the manufacturer. In pursuit of savings, you can purchase a product that will keep breaking and the homeowner will spend the money to repair it.

Often to reduce costs finished products companies use cheap materials with low quality. Of particular importance is the quality of the rubber used to make the membrane. This affects not only the operational life of the membrane tank, but also the safety parameters of the water coming from it into the house.

If a device with replaceable membranes is purchased, it is necessary to find out the cost of spare elements. Very often unscrupulous manufacturers for the purpose of profit cost of replacement parts artificially high. In such a situation, you should think about purchasing a model from another company. Often, large manufacturers are ready to take responsibility for their products, since reputation comes first for them. Therefore, it is advisable to give preference to models of expansion tanks of well-known brands.

Independent installation of the expansion tank

All models of expansion tanks are separated into two main groups, which are determined by the method of connection to a cold water supply. There are vertical and horizontal models on the market. At the same time, there are no special differences in the design of such devices. Placement features are of primary importance water pipes in the room where the equipment is installed. At the same time, during the installation of the membrane tank, one should adhere to certain recommendations of experts:

The installation of the expansion membrane tank must be carried out in a place to which there is free access. This is necessary for regular maintenance of equipment.
It is important to provide for the possibility of dismantling the connecting pipes in order to replace or repair the tank in the event of a breakdown.
It is important to consider that the diameter of the pipes to be connected must correspond to the inlet pipes of the expansion tank.
When installing the device, it must be grounded, which reduces the likelihood of electrolytic corrosion.

An expansion membrane tank is installed on the suction side of the pumping equipment. At the same time, there should not be any additional elements capable of making hydraulic resistance into the plumbing system.

Expansion tanks are an integral part of any autonomous cold water supply system. Thanks to this device, the required level of pressure in the water supply is maintained, premature wear of pumping equipment is prevented and a certain supply of water resources is preserved. However, this can only be achieved with right choice and device installation.

We offer to choose and buy an expansion tank for hot water supply according to favorable price in Moscow or with delivery transport companies anywhere in Russia. With the help of modern hot water expansion tanks, you can achieve a stable pressure in the system, convenient regulation of the water temperature, protect equipment from water hammer and reduce equipment wear.

Expansion tanks for heating and hot water: both

Due to the similarity of names, it is easy to confuse expanders for hot water and heating systems. However, these are different devices with different purposes:

The heating device is designed to compensate for the increase in the volume of coolant in the system. When heated, the volume of water increases by about 4% - 5%, so the purpose of the tank is to contain the excess volume of water that is displaced from the system when heated.
A hydraulic accumulator for domestic hot water is a device that accumulates a certain volume of hot water and maintains a stable pressure in the system. As a result, there are no pressure drops in different modes operation of the system (for example, when using hot water at several points at the same time) and equipment protection against water hammer is achieved. Besides, hot water reaches the point of consumption faster.

Therefore, a well-equipped heating unit of a private house, commercial or industrial facility contains both an expansion heating tank and a hydraulic accumulator.

How to choose the right DHW accumulator?

To successfully buy an expansion tank for hot water, you must consider the following parameters:

Water volume. Solutions with a volume of 2 to 35 or more liters are used, the selection is carried out based on the scale of the system (the length of communications, the number of points of water analysis, etc.).
Membrane material for DHW expansion tank. The preferred solution is EPDM rubber, which retains its elasticity and its original properties for a long time, despite temperature changes and constant mechanical stress.
Operating pressure indicators. They are selected in accordance with the needs of the system, based on design values or measurements of actual indicators.
Body material and coloring method. Mostly used models, the body of which is made of black steel with powder coating.

In our online store you will find the hot water expanders themselves, as well as all the necessary accessories for them: membranes, flanges, fittings, etc. Call now and our experts will help you choose suitable solution and agree on a convenient delivery option!