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WATER HEATERS CAPACITIVE ELECTRICAL
Manufacturing company Unitherm	Country of origin: Germany	Certificate of conformity GOSSTANDARD OF THE RF C -DE .AB 66.B .00374

ABOUTcompanies

German company Unitherm Haustechnik GmbH specializes in the production of water heating, heating, pumping equipment and electrical appliances.

All products are manufactured in factories in Germany and the EU and have the necessary certificates of conformity and quality. The latest technologies, the best price-quality ratio and modern design characterize the products as accurately as possible Unitherm and allow the company to occupy a leading position in the global market.

The company pays great attention to protection environment. First of all, this concerns energy-saving technologies and devices that help reduce the amount of harmful emissions into the atmosphere and use energy more efficiently.

Device and principle of operation.

Storage water heaters have a tank in which water is heated. In this case, cold water is at the bottom of the tank, and hot water is at the top.During the pick up hot water from the water heater, it is displaced by cold. Cold water enters the water heater from below, under pressure, and hot water is drawn from above. The diagram shows that the supply pipe cold water short, and the hot water intake pipe is long, so all the hot water the water is flowing on top of the water heater. In order for hot water to flow constantly, the water heater must have access to cold water, and it must be connected to the electrical network. It should be remembered that hot water from the storage water heater will not flow constantly, since hot water is displaced by cold water, and the heating element, although it turns on at this time, is not powerful enough to immediately heat the water.

Electric DHW water heaters - pros and cons

• Providing a sufficiently large volume of hot water (depending on the characteristics of the model you choose).
• Possibility of supplying hot water simultaneously to several water points
• Possibility of connection to a regular electrical network.
• There does not have to be a lot of pressure in the water main.

· The thermal insulation layer ensures that the water temperature in the tank is maintained for a sufficiently long time.

• The outlet water temperature can be very high (up to 75 0 C).

• Time required to heat water (minimum 20 minutes - depending on volume).

• When you consume little hot water, the device is forced to spend additional energy maintaining the temperature of the water in the tank, i.e. in fact, to heat it up.
• The main inconvenience of boilers is their size.
• Storage water heaters tend to be more expensive than instantaneous water heaters.
• Since water is stored in a container, its quality, especially drinking water, may deteriorate.

• With regular use, the magnesium anode needs to be replaced every 2-3 years.

Connection diagram for a capacitive electric water heater.

ELECTRIC STORAGE WATER HEATERS companies Unitherm

· Universal storage water heaters for installing heating elements, floor-mounted, 800-1000 l, stainless steel. steelUS... Uni S 59 kb

· Floor water heaters universal with the ability to install heating elements and/or heat exchangers with a capacity from 140 to 3000 l US...Uni

· Storage water heaters: electric, floor-mounted, 200-600 lUS,US...B 72 kb

· Storage water heaters: electric, wall-mounted, vertical, 30-200 lUSR 104 kb

· Storage water heaters: electric, wall-mounted, horizontal, 50-200 lUSR...H 86 kb

Capacitive electric water heaters.

Electric floor-mounted DHW heaters closed type seriesUS 200–600 B, US 200–400 with a capacity from 200 to 600 l, designed for floor mounting and operation in water heating systems with a maximum operating pressure of up to 10 bar. The devices have single-phase 230 V or three-phase 400 V electrical connection(volume above 400 l) depending on power consumption, possibility of using a cheap night tariff (only US ...). Water heaters can provide hot water one or more water points. To save energy, it is recommended to set the energy saving mode to 60° C.

Design

● Internal container made of steel ST 372, coated with anti-corrosion enamel;

● C removablethermal insulation made from environmentally friendly material;

● Built-in heating flange (∅ 180 mm) with a heating element made of of stainless steel;

● Protective magnesium anode∅ 33x400–M8;

● Control unit and heating indicator on the heating flange;

● Heating temperature regulator with smooth adjustment 20–75°C;

● Frost protection mode and safety temperature limiter.

IP 24 (protection against splashing water);

USR, with a capacity from 30 to 200 l, designed for wall mounting and operation in water heating systems with a maximum operating pressure of up to 6 bar ( USR 30–50) and 8 bar (USR 80–200). Water heaters can provide hot water to one or more water points and are used in both open and closed systems heating water. The devices are equipped with a heating indicator and a stepless regulator that allows you to set the heating temperature in the range from 15 to 65°C ( USR 30–50) or from 20 to 75°С ( USR 80–200).

Design

● Steel body, powder coated white;

● Internal container made of high quality steel ST 37–2 with a special glass-ceramic coating applied by casting at a temperature of 850°C;

● Control unit and heating indicator on the front panel;

● Heating temperature regulator with smooth adjustment from 15 to 65°C ( USR 30–50) or from 20 to 75°С ( USR 80–200);

● Mounting bracket included

● High degree of electrical safety: type of protection IP 24.

Electric capacitive water heaters of the closed type seriesUSR... H, with a capacity from 50 to 200 l, are designed for wall mounting and operation in water heating systems with a maximum operating pressure of up to 8 bar. Water heaters can provide hot water to one or more water points and are used in both open and closed water heating systems. The horizontal position of the device allows it to be placed in confined spaces. The devices are equipped with a heating indicator and a stepless regulator that allows you to set the heating temperature in the range from 20 to 73°C.

Design

● Steel body, painted with white powder enamel;

● High quality steel inner container St 372 with a special glass-ceramic coating applied by casting at a temperature of 850° C ;

● Thermal insulation from environmentally friendly material;

● Heating element made of stainless steel;

● Anti-corrosion magnesium anode;

● Heating temperature regulator with smooth adjustment from 20 to 75°C, hidden under a decorative cover;

● Heating indicator on the front panel;

● Thermometer;

● Frost protection mode and protective temperature limiter;

● Mounting bracket included.

● High degree of electrical safety: protection class IP X 4 (protection against splashing water).

Design and principle of operation of universal capacitive water heaters.

The principle of operation of universal capacitive water heaters is practically no different from the principle of operation of capacitive electric water heaters. The main difference is the use various systems water heating (electric heating element, water-to-water heat exchanger), and in water heaters with two-flange holes, their combinations.

Universal DHW water heaters - pros and cons

Positive characteristics:

• Providing a large volume of hot water (depending on the characteristics of the model you choose).
• Possibility of supplying hot water simultaneously to several water points
• Possibility of connecting various water heating systems (heat sources).
• There does not have to be a lot of pressure in the water main.
• High efficiency due to the use of various water heating systems.

· The thermal insulation layer ensures that the water temperature in the tank is maintained for a long time.

• High outlet water temperature (up to 95 0 C).

Negative characteristics:

• Time required to heat water.

· The volume of hot water is limited by the size of the tank.

• With regular use, the magnesium anode needs to be replaced every 1-2 years.

Universal floor-mounted storage water heaters of a closed type US...Uni volumes from 140 to 3000 liters are optimally suited for providing hot water supply both in small facilities and in facilities with a large demand for hot water.
Water heaters are produced in versions with one (140-500 l) and two (300-3000 l) flange openings, which gives ample opportunities combining water heaters for different heating systems - an electric heating element or a water-to-water heat exchanger, which are supplied separately.
All models with two flanged holes have a flange diameter of 240 mm (maximum power 2x45 kW), models with one flanged hole - 180 mm (maximum power 1x10 kW).
All water heaters are equipped with a threaded coupling for installing an additional heating element with a power of up to 9 kW.
Water heaters with a capacity of up to 500 liters are equipped with a metal casing, as evidenced by the M index in the model name. Water heaters with a capacity of 800 l or more are supplied in a soft, removable casing.
Water heaters can provide hot water to one or more water points.

Design

· Heating container made of high quality steel ST37-2 with double coating of environmentally friendly anti-corrosion quartz enamel;

· One flanged hole 180 mm (US ...1 M Uni) or two flanged holes 240 mm (US ...2 (M) Uni) for installing electric heating elements and heat exchangers, (unused holes can be closed with a plug and cover);

· Threaded coupling for installing an additional electric heating element;

· Highly effective environmentally friendly removable thermal insulation with a thickness from 50 (US ...1 M Uni) to 100 mm (US ...2 Uni);

· Magnesium anode or externally powered anode - for additional corrosion protection;

· Fittings for connecting cold and hot pipelines, as well as a fitting for connecting a return circulation pipeline;

· Hard metal casing (US...M Uni) or soft removable casing (US...Uni)

· Built-in thermometer.

Universal electric floor storage water heaters closed type US...Uni S with a volume of 800 to 1000 liters made of stainless steel, they are optimally suited for providing hot water supply in facilities with a high demand for hot water. Water heaters are produced in versions with two flange openings, which provides ample opportunities for the use of electric heating elements with a power of up to 10 kW each. The maximum operating pressure in the hot water supply system is 10 bar. Water heaters can provide hot water to one or more water points.

Design

• Heating container - stainless steel "inox» AISI 316 L , the weld is made using technology TIG in combination with plasma welding;
• High quality eco-friendly removable thermal insulation with magnetic closure, base color is white;
• Two flange holes∅ 134 mm at the front of the water heater;
• Thermometer;
• Fittings for connecting cold and hot water pipelines, as well as a fitting for connecting a return circulation pipeline;
• Height-adjustable legs

Global trends in the field engineering communications In recent decades, they have increasingly gravitated towards maximum decentralization. Preparing everything necessary for a comfortable life or a full-fledged production process directly at the point of consumption is an important component of resource-saving environmental management. As an energy carrier, the most convenient option is electricity. The advantages of electric water heating include:

• accessibility - electricity is now supplied to almost every building, including remote villages and summer country houses;
• simplicity - electricity has already become such a familiar attribute of our Everyday life that the user will not need any new skills to operate the new electrical appliance;
• environmental friendliness - there are now quite fierce debates about the environmental purity of electricity, because, indeed, during the production of electricity, damage to the environment is still caused, but the meaning of environmental friendliness of electricity consumption is that air pollution does not occur in a metropolis, where the air is already heavily polluted , and at a distance from it;
• safety - the installation of a household electric storage water heater usually does not require any additional permits, the installation and operation of a working boiler does not pose a threat to the life of the user, its power does not create additional excessive load on the general house electrical network, and the water heater practically does not require maintenance, and safety precautions are no more complicated than when heating an electric kettle.

For individual water consumption, water heaters designed for wall mounting with a capacity of up to 200 liters are quite suitable. Domestic hot water is usually required less than it might seem. After all, water in a container can be heated to much more high temperatures, than required, and then mix with cold water. It is convenient to make any calculations for a capacitive water heater using general formulas(1) and (2):

Q = cμmix(tmix - tcold), (1)

where Q is the energy that must be expended to heat water, J; c is the specific heat capacity of water, which at 10 °C is equal to 4.192 kJ/(kg⋅°C); μmix—mass of heated water, kg; tmix is ​​the required temperature of heated water; tcold is the temperature of the heated water. For ease of calculations specific heat capacity water is usually taken equal to 4.2 kJ/(kg⋅°C), and the mass of water μ is numerically equated to its volume V in liters (μ = ρV, where ρ is the density of water, which at 10 °C is equal to 0.99973 g/ cm3); Q = P τ, where P is the required power to heat a given volume of water by the specified temperature difference, kW; τ—heating time, s. Since what is required is not boiling water, but diluted water, we use the expression derived from formula (1):

cμhot(tmix - thot) + cμcold(tmix - tcold) = 0, (3)

where μhot is the mass of hot water in the boiler; thot - temperature of hot water in the boiler. Having carried out calculations using these formulas, taking into account the possibility of setting the value of thot up to 85 ° C, we obtain the required volume, usually within 100 liters. So, a wall-mounted electric capacitive (storage) water heater or boiler is designed to accumulate a certain supply of water, then heat it to a given temperature and maintain it for the purpose of distribution throughout the hot water supply system (DHW).

Cold water enters bottom part water heating tank. To ensure that the stream of incoming water does not mix with the heated water, various diffusers are used to help distribute the water along the bottom of the tank. Heated water rises upward under the influence of convection forces, displacing cold layers. This is how natural circulation of water occurs. After heating the entire volume of water to desired temperature heating is turned off.

The water heating tank is made of steel or stainless steel. In the first case, it needs additional protection against corrosion, which is provided by special enamel. Manufacturers keep the composition of the enamel and the method of its production secret, giving only general information about the name of the technology and application temperature. For stainless steel boilers important role plays a role in the quality of welds. Among the manufacturers presented in the review, stainless steel models include Ariston (ABS Platinum), Timberk (FS, RS), Thermex (Flat, Diamond).

Ariston uses argon-arc welding of seams with a tungsten electrode using the Micro Plasma TIG (Tungsten Inert Gas) system. Argon practically does not enter into chemical interactions with molten metal and other gases in the arc burning zone. Being 38% heavier than air, argon displaces it from the welding zone and reliably isolates the weld pool from contact with the atmosphere. Thermex chose Japanese technology welding of G.5 stainless steel, where welding is performed with an electron beam in a vacuum field.

This welding is most widespread in the aerospace industry, where quality and reliability play a key role. G.5 welding technology does not disturb the structure of stainless steel and retains alloying additives, which preserves high degree resistance of welded seams of water heaters to corrosion. There are also so-called “non-pressure models” on the market, in which the water heating tank is made of plastic.

E The operation of such a water heater imposes certain restrictions on operating parameters. In particular, they can only be used with special water outlet fittings and only for one water outlet. The advantages of such tanks include the absence of corrosion and low weight. The water heating tank is usually located vertically and has a round or square outer section of the lining.

But some manufacturers include in their range narrow (Ariston, AEG, Stiebel Eltron, Nibe, Thermex), flat (Gorenje, Austria Email, Ariston) and even horizontal models(Nibe, Timberk, Gorenje, Ariston) for installation in confined spaces. Heating is carried out using an electric heating element located in the lower part of the container. The filling and water intake fittings are also located there.

In horizontal and universal tanks, the heating element is sometimes inserted from the side, but this constructive solution less preferable, since it does not correspond to the direction of natural convection, therefore, an underheating zone may appear in the depths of the tank, where bacteria will begin to multiply. There can be one or several heating elements. In the latter case, it is possible to activate the accelerated heating option, which allows you to increase the power of the heating element one-time (Ariston, Thermex).

In previous years, the design of the heating group in all types of wall-mounted boilers was “wet”, that is, the heating element and tube with a temperature sensor were always located inside the tank itself. This imposed certain restrictions on water quality, in particular, its hardness. Since the temperature of the heating element is much higher than the ambient temperature, scale is deposited on it first.

And replacement or maintenance of the heating element required complete emptying of the boiler. Now some manufacturers use a “dry heating element” in their tanks, located under the bottom of the water heating tank, which can be removed at any time. Some modern water heaters are equipped with a digital display with electronic control of water temperature, even with programming capabilities (Ariston, Gorenje, Thermex). The color of the water heating tank is usually white. But it’s not at all necessary. The market is actively conquered by boiler models in black and metallic colors (Timberk, Gorenje, Thermex).

Summer is coming, and with it begins preventive maintenance water supply mains. For city residents, these events, which take place year after year, are no longer a surprise. There is less and less desire to put up with temporary inconveniences. Many people are looking for a way out of this situation in a store that sells water heaters.

Electric water heaters are presented in a wide range and are located in different price categories. Their cost depends on the principle of operation, volume, power and other parameters. Wide the lineup allows you to purchase an electrical appliance in optimal ratio price and quality, but requires additional time. To choose suitable model, corresponding to the required operating conditions, it is necessary to become familiar with the types of equipment and study their technical characteristics in detail.

Types of water heaters. Their differences and design features

Gas water heater - This geyser. This unit is very convenient if a gas line is available. Columns or flow-through gas water heaters classified by type of ignition. In the case of piezo ignition, the wick in the column is constantly burning. The column is launched using a button. Electric ignition occurs automatically. There are models with turbine ignition that turn on when water is supplied.

Gas storage water heaters are rarely used due to the high cost and complexity of installing the unit.

Electric water heaters

Options are possible when the electrical network is more accessible than the gas main or the water heater is used occasionally if the central hot water supply is turned off. Having decided to choose an electric water heater, you need to decide on its type.

The main types of electric water heaters include flow and storage ( capacitive ) . The latter have gained wide popularity in everyday life, small industrial and office organizations. Storage water heaters can be floor-mounted or suspended, as well as round or flat. This makes it possible to simplify their installation and aesthetically combine them with the interior of the room.

Cumulative electric water heaters

They can provide only a limited amount of hot water. After using it, additional time is required to heat a new portion.

The operating principle of a storage water heater is based on the action of natural convective flows. Cold water from the water supply system enters the working tank of the tank through the inlet fitting. increases its temperature (35–85°C), which leads to a decrease in density. The heated liquid, which has a lower density, rises to the upper layers of the tank. Then it enters the system through a special tube, which is located vertically and has a height slightly less than the working tank.

This design eliminates the occurrence emergency situations caused by a lack of water in the tank when its supply is stopped. It is also advisable to install check valve to the inlet pipeline so that liquid does not flow back into the water supply system during a supply shutdown.

In order to reduce heat loss, thermal insulation is provided in the water heater body. The average power of these water heaters allows you to connect a boiler without changing the wiring, which is quite capable of withstanding 2 kW. Of course, there are capacitive water heaters with higher power.

When connecting a storage water heater, it is important to ensure strict compliance with the manufacturer’s diagram. Its violations can lead to premature breakdowns.

It is used as a heating element in storage water heaters. The latter use the electrical resistance of the liquid for their work. The current flowing from the anode to the cathode overcomes its resistance, which leads to heating. This scheme is safer to use, since if there is no water in the working container, the circuit is open and heating does not occur.

The heating element consists of a brass tube, inside of which there is a conductor with the necessary electrical resistance. It is covered with ceramic or other insulation. Heating element models are better at promoting thermoregulation than electrode models.

Instantaneous electric water heaters

Instantaneous heaters are compact in size and can provide a large volume of hot water, limited only throughput. They are optimally suited for use in dormitories and other residential premises with a large number of residents.

Inside the instantaneous water heater there is a heating element, which is a heating element. He is copper tube with nichrome spiral. The water heater is connected to the network, and the heating element is heated by electric current. Cold water, passing through a flow-through water heater, heats up and leaves the device already hot. An instantaneous water heater must have high power in order to heat the flow of water. It will take from three to twenty-seven kilowatts. Not every electrical wiring can withstand such power. Homes where they are installed have advantages. electric stoves. In these houses, the wiring will withstand the load created by the power of the instantaneous water heater. Two conclusions emerge. If you decide to install an instantaneous water heater in a house with old wiring, then you will have to re-wire the network or separately for the water heater, taking into account the power. In another case, you can simply choose a storage (capacitive) water heater. Its other name is boiler.

Nuances to consider when choosing and connecting

First of all, you should determine the type of device. It is important to take into account the number of residents. Right choice type of equipment will ensure rational costs Money at the time of purchase, and will also allow you to save on electricity consumption in the future. When choosing a storage water heater great importance has it capacity and power, since heating time and current consumption depend on these characteristics.

Using a water heater, you can consume hot water from one or more taps. Storage heater Suitable if you plan to get hot water from only one tap. To provide hot water from several taps, a pressure-type water heater is suitable.

Having figured out the number of taps, you need to decide on the volume of the storage water heater. Hot water is needed to take a bath or shower, wash dishes, hands, etc. About 150 liters are consumed for a bath, a shower will require 30 liters. The kitchen sink uses up to 20 liters. This average consumption hot water per person. A family of three will need a cylinder water heater with a volume of at least 80 liters. If all family members want to take a shower, the water heater will have to be turned on several times. There are large volume water heaters, for example, 400 liters. Possible options: water heater in the kitchen and bathroom. At dachas, electric water heaters are usually installed for washing hands and taking a shower. In the first case, a boiler with a volume of 15 liters is sufficient. To take a shower, you will need a water heater with a volume of at least 30 liters. There are water heaters for autonomously supplying hot water to the entire house.

A type of storage water heater is a boiler. It has a body with a cover, a tap and controls located on the front panel. Such boilers are very convenient in cafes, canteens, and offices. Water is poured into a similar boiler by removing the lid. Boilers have different volumes. The smallest boiler is equipped with a 5-liter tank.

Instantaneous electric water heaters water heaters have a number of advantages. They heat water almost instantly. Their compact size allows them to be placed without taking up much space. If you accept the fact that this device consumes a lot of electricity, and you will need a separate one for its installation. must correspond to the consumed load.

To protect users from electric shock during operation, it is necessary to ensure connection to a metal circuit and a residual current device (). In accordance with the rules for electrical installations (PUE). This will increase operational safety and also prevent the occurrence of unforeseen situations, which often entail additional financial costs.

Storage water heater will provide you with a large supply of hot water. It is economical in energy consumption. There is no need to change the electrical wiring when installing this device. If you have a place in your home where you can install a fairly large boiler, and you are willing to wait a while for the water to heat up, then your choice is an electric storage water heater.

The long service life of the water heater is ensured by the corrosion-resistant materials from which it is made. The internal tank of the water heater is made of carbon steel, protected by an enamel coating, or polypropylene. Sometimes the inner casing is made of stainless steel.

Unfortunately, scale forms on the inner surface of the water heater over time. You can combat scale formation with the help of filter units.

The index is indicated on electric storage water heaters. The first number following the abbreviation indicates protection against foreign bodies. The second digit carries information about protection from water.

Taking into account your living conditions and financial capabilities, you can choose a water heater that fully meets your comfort requirements. Hot water outages are no longer a problem.

During a hot water outage, residents of city apartments have to resolve the issue of preparing hot water for household and hygienic needs.

Of course, you can heat buckets of water on gas stove or douse yourself with cold water. But, you must admit, such a prospect will not please many people. Therefore, to solve this problem, it is better to install an electric water heater that can provide you with a supply of hot water.

In the previous publication, we talked about which water heater to choose - instantaneous or storage?

If you do not want to pull the cable from the electrical panel on the site to connect flow heater, then it is better to buy a capacitive-type water heater.

Let's talk today about choosing a capacitive heater - what they come in design and volume, what to look for when buying a heater in a store.

Let's look at how a storage water heater works to understand the principle of its operation.

The water heater circuit is shown in the figure below:

In the figure the numbers indicate:
1 – electrical cable to the electric heating element; 2 – cold water supply pipe to the heater; 3 – hot water outlet pipe; 4 – heating element (heating element); 5 – thermostat; 6 – magnesium anode; 7 – water heating temperature regulator; 8 – tank; 9 – thermal insulation; 10 – outer covering of the water heater.

A video about storage water heaters is presented below:

Characteristics of storage water heaters

Before choosing a water heater in a store, you should decide on the basic characteristics that meet your needs.

Let's look at the main characteristics of tank-type water heaters.

Tank capacity

One of the most basic characteristics of a cylinder heater is the volume of its tank.

On sale you can find heaters of various volumes from 30 to 500 liters.

For use in an apartment, water heaters with a capacity of 50 to 100 liters are usually purchased. Read below about choosing the required volume.

Electric power

No less important characteristic is electric power heater. It will depend on its value whether you can plug it into a regular outlet or whether you will have to lay it from the shield to landing a special electrical cable for connecting the water heater to the electrical network.

The sockets in the apartment are designed to connect a load not exceeding 2 kW. Therefore, be sure to check the power of the heating element before purchasing a water heater.

It should be remembered that the lower the electric power of the heater, the longer you will have to wait until the next portion of water heats up.

Time to heat water to a certain temperature

This characteristic directly depends on the previous indicator. The more powerful the heating element installed in the heater tank, the less time you will have to wait for the water to warm up.

The lower its power, the longer you will have to wait until you can use hot water.

Geometric parameters

Today you can find cylinder water heaters in stores various shapes, which allows you to select a device of the required volume for any design and for various options placement.

Water heaters are available in both cylindrical shapes and flattened configurations, the so-called “slims”, which can be more easily integrated into the interior of the bathroom.

The water heater can be placed above the toilet in a mixed bathroom or above washing machine. This placement will allow you to use the available free space in the bathroom most economically.

Often, when free space in the bathroom is very limited, water heaters are moved to the kitchen. In this case, a small volume water heater can be mounted under kitchen sink so that he does not violate general interior premises.

Most often purchased vertical water heaters, allowing them to fit into the interior most organically.

A vertical water heater can be placed above a bathtub, washing machine, washbasin or above a toilet - that is, where something is already installed on the floor.

Horizontal water heater

But sometimes it will be advisable to take a closer look at purchasing an electric water heater that has a horizontal orientation.

A horizontal water heater can be mounted above the shower stall.

Flat storage water heaters

For a small-sized city bathroom, flat-type water heaters (slim) are best suited.

Due to their small thickness, they are much easier to organically place in the bathroom than round barrels.

What size water heater should I choose?

The volume of the water heater should be selected based on the number of family members and their needs.

If the heater will be used for washing hands before eating and for hygiene procedures in the morning and evening, then a minimum volume water heater (10-15 liters) will be sufficient.

If, in addition, you are supposed to take a shower or do a little laundry, of course, the volume should be larger.

It is generally accepted that for one person it is enough to purchase a water heater with a volume of 30-50 liters. Such a water heater will allow you not only to wash dishes or rinse your hands before eating, but also to take a shower or do a little laundry.

For a family of two people, a water heater with a tank volume of 50-80 liters will be sufficient. This is quite enough to take turns taking a shower or running a bath.

For a family of 3 people (with a child), you should focus on a water heater capacity of 80-120 liters. A volume of 100 liters can be considered optimal. This is quite enough for parents to take a shower and also fill a bath to wash the baby.

If there are more than three people in a family, the storage electric water heater must have a capacity of at least 100 liters (from 100 to 200 l).

In general, to select a water heater capacity, you can refer to the table below:

Storage water heater volume selection table

Which storage water heater is better?

When choosing, you should first of all give preference to water heaters of well-known brands that have been on the market for a long time and have proven themselves well.

Water heaters Ariston, Electrolux, AEG, Bosch, Thermex, Stiebel, Gorenje They are very reliable in operation, have high-quality assembly and a long service life.

Prices for storage tank water heaters

Prices for tank-type water heaters vary depending on the brand of the manufacturer and the volume of the tank.

Most low price have small volume water heaters. Yes, water heaters Haier, Elsotherm, Atmor, Thermex a volume of 8-10 liters can be purchased for 2500-2900 rubles.

Water heaters with a tank from 15 to 30 liters will cost 3000-3500 rubles. behind inexpensive models. Ariston the same capacity will cost around 4,300 rubles.

From 3,800 rubles you can purchase water heaters with a capacity of 50 liters, and 80-liter models will cost from 4,090 rubles ( De Luxe W80V), 4290 rub. ( Haier ES75-A1).

More expensive models can cost from 15-20 thousand rubles. up to 40 thousand rubles (Stiebel).

***
Now you know what to look for when choosing an electric storage water heater.

In the next article we will talk about how to connect a storage water heater to a water supply, and also consider connecting the heater to the electrical network.

Capacitive electric water heaters

To create reserves of hot water and use it for various needs, there are mainly 2 types of devices: electric capacitive water heaters and gas. The former are used where there are no gas mains nearby, but electrical networks have been laid. Despite the fact that the cost of hot water heated in gas boiler, 3-5 times cheaper than heated in an electric capacitive heater, this is often necessary, since in many cases without hot water it is impossible to carry out most technological processes, if this is production, or just comfortable to exist if these are household buildings and structures.

The principle of operation of an electric water heater is to transfer heat generated when an electric current passes through a heating element placed in a container of water. A heating element transfers this heat to the surrounding water by conduction (contact). The temperature of the water in a cylinder water heater depends on its power: the greater the power, the faster the water heats up and the larger its volume can be heated per unit time.

Thus, capacitive electric water heaters are one of the simplest in their design and principle of operation available in terms of preparation for use (you only need electric outlet), but quite expensive in terms of the cost of heating a unit volume of water.