How to choose and connect an electric instantaneous water heater: which type to choose based on reviews. How to choose the right instantaneous water heaters

A household instantaneous water heater does not require a special storage tank. The principle of its operation is that the water flow is informed required amount thermal energy during the short period while it passes through the device.

• through electrical energy heating a heating element or an uninsulated metal coil;
• using a gas burner;
• using a heat exchanger in which water receives thermal energy from any coolant.

The last of these options is extremely rare; one of the first two is much more often used.

In order to choose correctly instantaneous water heater for an apartment, you need to consistently answer a number of questions:

1. Energy source: gas or electricity? If there are chimney ducts in your house and the housing office allows the installation of gas equipment, then the most preferable option would be to install a gas water heater.

The power of a standard gas burner is even enough to heat water for a shower in winter. If your house is not equipped with chimneys, you will have to install electric water heater.

Its maximum power depends on the type of existing wiring.

For example, in old houses, in the panels of which fuses are installed, designed for a maximum current of 16 amperes, you can install water heaters with a power of no more than 3.5 kW.

During the construction of houses in a later period, electrical networks were laid, designed for 32 and even 40 amps.

This wiring will withstand a heater with a power up to 8 kW. If you want to install more powerful unit, it is necessary to coordinate with the electricity supplier the laying of a separate power cable.

It should be taken into account that instantaneous water heaters with a capacity from 8 kW are designed for three-phase voltage.

Thus, in apartment buildings powerful “flow-throughs” are used quite rarely, this option more suitable for individual construction.

Video - types and types of electric instantaneous water heaters:

2. Type of water heater: pressure or non-pressure? To supply hot water to the entire apartment, you will have to install a pressure water heater, which runs directly into the cold water supply riser.

Such equipment can provide hot water several water points. If you just want to shower comfortably during the summer shutdowns hot water– choose a non-pressure heater.

As a rule, such devices have low power and are equipped with shower heads. However, it must be taken into account that they are suitable for heating water in the summer.

In winter, when the water temperature in the pipes drops to 5 degrees, there will be little use from a low-power, non-pressure “flow tank”.

3. What size water heater do I need? It will be much easier for you to determine not so much the power as the water flow rate at known incoming and outgoing temperatures.

It is this parameter that the manufacturer indicates in the passport of its equipment. Open the water as usual and note how long it takes to fill, say, a bucket of water with a capacity of 10 liters.

Convert the received data into consumption per minute and feel free to go to the store. Now you can definitely choose the most suitable instantaneous water heater.

Beware of buying dubious products or outright fakes, even if the seller promises you a significant discount.

Poor quality electrical or gas equipment will not only add trouble to you with repairs, but also may cause fires or explosions, the consequences of which will be much more expensive.

When purchasing equipment, ask the seller to show quality certificate, and also ask what warranty period is provided for this equipment.

Popular electric heaters (cost and characteristics) ^

As already mentioned, using a powerful instantaneous water heater in an apartment is associated with great difficulties.

Therefore, in this review we will talk only about low-power devices that occupy leading positions in sales volumes. The following brands have proven themselves well in our country:

1. “Atmor Summer” (power - 3.5 kW, flow rate - up to 3 l/min). Inexpensive budget heater. Capable of “giving out” a temperature of 40 degrees, provided that at the entrance it is not lower than 18. Approximate cost - 800-1500 rubles.

2. “Polaris Vega T 5.5” (power - 5.5 kW, flow rate - up to 4.4 l/min). Compact device with slightly more power.

Easily and conveniently mounted under a bathtub or washbasin, without any claim on the free space of the bathroom. Supplied with a faucet or shower head (depending on the installation location).

3. “Proton” PEVN 5.0-220 (power – 5.0 kW, flow – 5 l/min). The approximate cost of this Russian model is 2500 rubles.

This device, like others of domestic production, is good because its creators tried to take into account the low quality of water in our water supply networks. Thanks to this, it is characterized increased service life.

4. “Stiebel Eltron DHC 3” (power – 3.0 kW, flow – up to 3 l/min). This manufacturer can safely be classified as a premium class, which, of course, was reflected in the cost of the model: 8000 rubles.

But for this money you get, as motorists like to say, “full stuffing”: double protection against overheating, protection against water ingress (IP24), trouble-free German automation, as well as a convenient and informative indicator system.

5. “AEG MP 8” (power - 5.0 kW, flow rate - up to 4.4 l/min). Another reputable brand, the cost of one model varies within 7500-8000 rubles.

A reliable and unpretentious device, the relatively high price is justified by the quality and functionality.

Any water heater requires periodic replacement of the heating element. Read all about heaters for water heaters in this article:
, find out how to choose, replace, where is the best place to buy.

Gas instantaneous water heater^

This type of instantaneous water heater is better known as geyser. As already mentioned, the installation of such equipment requires coordination with gas services, and also requires the presence of a chimney. Exists two ways to ignite a gas burner:

1. Ignition using a wick. Such a column has a small gas wick, which is ignited once, for example, in the morning and burns throughout the day.

It is from the wick that the gas burner ignites when the water tap is opened. This ignition system is cheaper, but is characterized by inefficient use of gas.

2. Piezoelectric. A similar principle is often used in lighters for kitchen stove. This system runs on batteries and sparks automatically when the tap is opened.

Inexpensive models of gas “flowers” ​​have hydraulic control. This means that the water flow simply turns on gas burner without adjusting its power.

More expensive models are equipped with “smart” electronics that analyze the power of water flow, the temperature at the inlet and outlet of the device.

In accordance with the data received, the valve on the burner is controlled, so that the unit always operates in optimal mode.

An important requirement: in the room where gas water heating equipment is installed, the window must be slightly open.

This is done to avoid carbon monoxide poisoning.

Do-it-yourself installation of a “flow duct” ^

1. Connecting the heater to the water supply system. It is believed that the most common low-power instantaneous water heaters serve exclusively in the summer, when the hot water supply is turned off for preventive purposes.

Therefore, there is no need to make major changes to install such a device. It is most rational to connect the outlet pipe to the shower pipe, and the input pipe through a tee to the cold water supply system.

More powerful pressure water heaters, like boilers, are connected according to the return scheme.

2. Electrical connection. Even if the water heater has an average power - approximately 6 kW - there is still no need to connect it it is necessary to extend a separate wire from the shield.

This has to be done for the reason that most meters are not designed for such a current load (approximately 27 amperes).

The cross-section of the wire and the type of circuit breaker (in this case you need to install an RCD) are selected according to special tables. Remember that the outlet into which the water heater is plugged in must have a grounding wire.

3. Connection to the gas main.

It is prohibited to make such a connection yourself!

After gas water heater installed and connected to the water supply system, you must invite a representative of the gas service, who will connect the equipment to the gas supply system.

A short video about the pros and cons of instantaneous water heaters:

Calculation of instantaneous water heater power

When choosing an instantaneous water heater, its power plays a decisive role. The power of an instantaneous water heater can be determined based on the purpose of use (for example, showering, washing hands, etc.).

To do this, use the table below. First determine the required hot water flow (l/min) for the largest water consumption point. Even if you use an instantaneous water heater for several points, select its power according to the water intake point with the highest required power.

Knowing the flow rate at the largest point of water consumption, the power is calculated using the formula:

P=G*∆t/14.3

P– water heater power, kW;

G– flow rate or flow, l/min;

∆t– required temperature increase, ºС, ∆t = T-t input ;

T- required temperature at the outlet of the water heater, ºС,

t input- temperature cold water, ºС (in winter it is +5 ºС, in summer +15 ºС).

If you plan to use several points at the same time, then the power of the instantaneous water heater should be increased by another one and a half times.

Important! You can get a comfortable, full-fledged stream of hot water using an instantaneous water heater only if its power is 8 kW or higher. In old buildings with 16-amp plugs, a water heater with a power of more than 3.5 kW simply cannot be installed. And in houses with electric stoves and new houses where there are 40- or 32-amp meters, it is permissible to install “flow generators” with a power of up to 6 kW.

On a note. There is also a more simplified calculation. In order to estimate the required power of a water heater, you can use a simpler calculation: divide the power value (kW) in half. The result will be a fairly accurate value of water flow (l/min) when it is heated by approximately 25-30 ºС. For example, for taking a shower, a device with a power of 16 kilowatts will provide a water flow of 8 liters per minute.

Single-phase or three-phase

There are instantaneous water heaters for both single-phase (up to 12 kilowatts) and three-phase networks (from 12 to 36 kilowatts).

For a centralized installation, if you have the opportunity to install a three-phase water heater, install it as it is more powerful. The more powerful the water heater, the more comfortable and economical it is.

When installing instantaneous water heaters at each water intake point separately, install predominantly single-phase ones, having previously calculated their power as described above.

Pressure and non-pressure

According to installation method water supply network Instantaneous water heaters are divided into pressure and non-pressure.

System (pressure) instantaneous water heaters (from 4.5 kW and above). They only provide inlet and outlet for water. They are cut into hot and cold water pipes, i.e. hot water is distributed throughout the entire apartment. This is very convenient, since during the period when hot water is turned off, you can not only take a shower, but also use hot water from any tap in the apartment. This water heater turns on and off automatically, reacting to the flow of water.

The pressurized water heater in the image below fits into the water supply and can supply water to all water intake points.

Non-pressure instantaneous water heaters (from 3.5 to 8 kW) are equipped with their own shower or kitchen nozzle (it is included in the device) and operate only at one water intake point. Such devices cannot be used with fittings other than those sold with this water heater. Such water heaters are convenient, say, in the country.

The image below shows a tankless water heater. Distinctive feature non-pressure water heaters is the presence of a tap at the inlet and never at the outlet.

It is recommended to use small instantaneous water heaters equipped with shower heads with a power of 3 to 6 kW only in summer. In winter, there are often complaints that the water heater worked great in the summer, but now, during a heating network failure, it refuses to heat the water. Reason: in the summer, the temperature of the “cold” water “entering” from the tap was +15°C. His small instantaneous water heater with a power of 3.5 kW (with ∆t - 25°, giving 3 l/min) in the summer easily “heated” it by another 25°. That is, 15° + 25° = 40°C is a completely suitable temperature for washing. And in winter, the water in the tap is colder, about 5 degrees. So: 5° + 25° = 30°C - under such water, of course, you will freeze. And the device itself has nothing to do with it, it works as usual, nothing is broken in it. Small instantaneous water heaters were developed for warm countries in Asia and Africa. And there there are no such differences between winter and summer temperatures, and the water temperature in the tap is always about +15°. It just needs to be warmed up a little.

A few words about the efficiency of instantaneous water heaters

IN household with a hot water demand of 150 l/day, .

Considering the low cost of an instantaneous water heater, its compact size and the fact that it is almost always equipped with kitchen faucet or a shower head, it is reasonable to buy such a water heater for each water intake point separately, because this leads to energy savings on heating water in pipes if the water intake points are significantly removed from the water heater.

Since the water in an instantaneous water heater is heated only during consumption, energy is not consumed to maintain the temperature of a certain amount of water, as in storage water heaters, and this reduces operating costs.

In addition, instantaneous water heaters minimize water consumption due to the fact that the user does not have to wait long for water to flow at the required temperature.

Instantaneous water heaters are very durable. Their service life is more than 20 years, while storage ones have 8-10 years with proper maintenance.

Price and brand

After you select several alternative models based on the characteristics described above, all you have to do is call our office if you need to ask all your questions, clarify what is currently in stock and choose the water heater that suits you best in terms of price and according to the manufacturer's brand.

The highest quality instantaneous water heaters are Aeg and Stiebel Eltron, these are the companies

Is the boiler unable to heat the required amount of hot water or is it always needed immediately? Is the only reliable and affordable source of energy a 220 or 380 V network? There is no desire, opportunity or conditions for installing bulky equipment? Don't know how to choose an instantaneous electric water heater? The information in the article will answer all questions.

Installation of instantaneous water heating is quite simple. The basis of the engineering solution is the heat transfer zone. It contains a heating element of one type or another.

1. The classic solution is a heating element, inside of which there is a wire spiral.
2. A more modern heater is a tubular one. This is an inductor protected from moisture, which has good efficiency and heats up to high temperatures.
3. The most technologically advanced solution is the system induction heating. It consists of an electromagnetic coil and a core, which is heated by Foucault currents.

To ensure that the temperature of the liquid passing through the device circuit can be adjusted by the user, heater manufacturers offer a whole range of control circuits. Among them there are always security systems. They prevent water from heating to boiling temperature or above a preset maximum value, operating in idle move, short circuits and other emergency situations.

The flow heater has impressive list advantages. They make it a very convenient product for quickly, within seconds, getting hot water. For example, future owners are attracted to:

• compact size;
• no special installation requirements;
• ability to work with any water flow;
• clear adjustment mechanics;
• equipment that allows you to immediately select a model that meets your needs.

But an instantaneous electric water heater also has disadvantages that can create problems in the average apartment or house. For example:

• a powerful device, having a consumption of 7 kW or more, will easily overload weak wiring;
• the number of liters of water that the installation is capable of heating per minute to a comfortable temperature may be insufficient to meet the needs of the family;
• an incorrectly selected type of water heater may be used ineffectively.

An accurate assessment of all parameters will allow you to choose a flow-through heater for your home, cottage or apartment, the characteristics of which will be very attractive. Let us dwell in more detail on those features of the device that should be taken into account when purchasing.

Types of flow-through electric heaters

As stated above, all flow-type devices are built on the same basic circuit. Deciding which electric water heater is best to buy is based, first of all, on its performance characteristics and design. Available on the market:

• devices wall mounting with a vertical orientation of the body, with lower pipe connections. They can supply water to the shower through a flexible hose, to a gander, or to a water intake line;
• wall-mounted heaters with side supply. They are optimal for placement behind a partition or wall. Unregulated models work excellently: when water is taken in an amount not exceeding the performance indicator of the device, it always has a precisely specified temperature;
• Appliances with overhead connections are optimal for the kitchen. They are easy to install under the countertop, inside the furniture set;
• tubular type flow heating systems. Their connection is made directly inside engineering systems, installation is carried out directly into the pipe passage line. The liquid inlet and outlet are located at the ends of the heater, and the adjustment systems are either not provided or are designed for a single heating mode setting. A separate product segment is compact water heaters manufactured in the format of a rack for a kitchen sink faucet.

The latter type of flow-through heater may be the optimal solution if the owners chose it for installation in an apartment. Such a device can work in tandem with a storage-class boiler through a three-way mixing valve. This ensures the constant availability of hot water, the possibility of intensive selection and constant comfortable temperature liquids.

What to consider when choosing a device

Let us dwell in more detail on the set of characteristics of a flow-through electric heater, the choice of which will allow you to obtain a device that does not create troubles and provides a sufficient amount of hot water. Let us immediately note several features that allow us to better evaluate the device.

1. The indicated performance of a flow-through heater is the amount of water that it is capable of delivering in a constant flow at the maximum temperature (specified in the passport).
2. Unregulated devices or those equipped with mechanical control systems always have a clear electricity consumption indicated in the characteristics of the device. At the same time, flow heaters with electronically controlled spend as much energy as necessary to heat the water to the specified temperature.
3. Devices equipped with a shower head are not always suitable for a summer residence. The nozzle has very small holes. It is suitable for washing dishes or hands, but will be inconvenient if the water heater is placed in the shower.

Devices intended for one water collection point are called non-pressure devices. Installed at the entrance safety valve, which provides an internal fluid pressure of 1 atmosphere. Such a water heater cannot supply more water than its design allows, even if it gushes out with intense flow from a “cold” tap.

Devices designed for several water sampling points can withstand pressures of up to 10 atmospheres. They can be installed directly at the entrance to the apartment and select a performance sufficient for all household needs.

Selecting an electric instantaneous water heater by power

Before going to the store, you should consult with electricians. The calculation of the average wiring in a modern house is based on the ability to connect several powerful consumers. This washing machine, oven, electric grill. Therefore, a small flow-through heater with a power of 4-6 kW can be safely used provided it is turned on for a short time (up to half an hour).

If the house is old and the wiring is weak, it is recommended to make a separate connection to the apartment, from which the instantaneous water heater will be powered. The perfect solution- lead the tires to the apartment panel directly from the basement or from the central distribution point. In this case, one more problem can be solved: to provide a neutral wire, which is in modern houses, is necessary to connect the device, but is missing in old buildings.

It is recommended to make a separate entry in any case. However, understanding that no one will make serious repairs involving gating walls or opening wire laying channels unless absolutely necessary, it is worth carefully assessing the capabilities of the existing wiring and choosing a water heater that can operate in existing conditions without accidents.

Selection by water consumption

As mentioned above, the heater’s passport indicates the rated performance. The water flow produced by the device is always diluted. Therefore, if 3 liters of selection per minute with a temperature of 55 degrees is stated, such indicators are enough for a comfortable shower.

The second factor that needs to be taken into account is the difference in the performance of the device depending on the time of year. The water in the supply pipe varies in temperature. In summer it is warmer, in winter it is completely cold. For example, in the summer, a water heater with a power of 8 kW will provide 3.1 liters of water with a temperature of 55 degrees (18 at the inlet). And in winter, with a water supply of 6 degrees, the output will be only 2.3 liters of hot liquid.

To successfully choose a device, you should focus on its class and declared performance indicators. For example, for a non-pressure device that is mounted at one sampling point ( kitchen sink, bathroom, shower), a capacity of 3-4 liters will be enough (less can be done if you are not in the habit of taking a shower with a good flow of water).

For a pressure water heater with several tapping points, the minimum value is 3 liters per minute for one consumer. Each subsequent tap should add 1.5-2 liters to the recommended performance of the device.

Features of the heating element

The class of the heating element can be a decisive factor and determine which company to choose a water heater. For example:

• the simplest devices use one or more heating elements. They can be anodized or copper sheathed;
• more advanced devices are equipped with ceramic tubular heaters. They are durable, expensive, effective;
• The best heaters are glass-protected spiral blocks. They do not require maintenance and slightly change the rate of heat transfer during scale formation.

Spiral induction heat exchangers are the most technologically advanced solution. During their operation, very little scale is formed, since Foucault currents, in addition to heating, cause vibration of the central core and the current spiral. Some water heaters of the Swedish Electrolux brand are equipped with such heaters.

Material from which the heater is made

The heater housing is the last thing to evaluate. Each buyer has a personal rating. For example:

• Practical people will prefer plastic. It is easy to care for, but over time, scratches and rough spots inevitably appear that collect dirt;
• Enameled housings look rational. They are durable, the surface is durable, wear-resistant, and looks aesthetically pleasing;
• Anodized body parts look stylish and impressive. However, the coating may wear down to the base over time. Excellent strength indicators of the titanium layer. Such a case is an expensive solution, but it looks extremely attractive;
• all metal, polished, made of of stainless steel or alloy water heaters are the height of perfection in the eyes of some buyers. But it is worth considering one factor. On smooth mirror surface metal will always show stains and other visual imperfections. Careful, ongoing care will be required.

Which company is preferable?

Knowing how to choose an instantaneous electric water heater, one cannot fail to mention the companies that lead in customer preferences. At one end of the scale are simple, inexpensive and reliable solutions. The Polaris brand can be noted as a prominent representative. Here are classic, simple heating elements, moderate power consumption, maintainability and availability of spare parts.

At the other end of the scale are products from Electrolux. Technological innovations are used here. For example, induction heating units, spirals protected by glass. The price of water heaters is high, but the reliability is even higher; the products will not require maintenance or repair for many years.

Rating of the best flow-through electric heaters

It's time to get acquainted with the best representatives of the instantaneous water heaters market. In order not to repeat the same indicators: electricity consumption, productivity, number of sampling points (device type) and others, they are summarized in a table. And the rating will introduce you to the main features of the devices.

A solution that can be considered universal. The water heater is controlled electronically, you can set a temperature threshold, and there is an accelerated heating mode. Setting the required parameters is done using convenient circular controls. The water heater belongs to the non-pressure class (one tapping point) and is equipped with a hose with a shower head.

An electric instantaneous water heater, which is suitable for an apartment where a family of two lives. The performance is enough to take a shower, for household needs. The device can withstand up to 10 atmospheres of water supply, can be installed at the entrance of the apartment, is powered by single-phase network 220 V. Its design is simple, the pipe supply is standard, 0.5 inches, so even DIY installation will not cause any difficulties.

Representative of simple, reliable solutions for small apartment or at home. With good performance for its power, the water heater offers simple diagram setting modes by pressing one button. Installed at the entrance to the apartment, it is capable of providing water distribution to several points. The convenient shape of the body allows you to install it in the bathroom, and the equipment (hose and shower head) allows you to use the device to create comfort in the countryside.

Representative of the market segment of the most reliable and unpretentious devices. This water heater is made in an enamel-coated body, equipped with copper heating elements, comes with its own water purification filter at the inlet, and offers setting of the operating mode by pressing one button. Designed for one point of consumption (non-pressure class), this device will be very effective in the kitchen or bathroom. For installation in the bathroom, the manufacturer offers a gander faucet that comes complete with the device.

A product ideal for a private home. The device operates from a three-phase network and has sufficient performance to provide hot water to a family of 3-4 people. It can be installed at the entrance to the house, can withstand up to 10 atmospheres of water pressure and offers an accelerated water heating mode. Temperature regulation is carried out by a single regulator on the body.

Compact, designed for use in apartments (inlet water pressure up to 6 atmospheres), this water heater will appeal to many. It is equipped with a regulator that will allow you to balance the water intake and the load on the wiring. This device will be convenient both in the kitchen and in the bathroom, where it can be mounted directly above the bathtub or washbasin. A gooseneck crane is included with the device.

An excellent solution for a private home with a large family. This reliable, non-adjustable device boasts a whole range of record-breaking indicators. Firstly, it is equipped with an induction heating system. Secondly, it has a maximum outlet temperature limit of 60 degrees in its class. Thirdly, it can provide good performance for its power. The device is powered by a three-phase network, can be installed at the water inlet into the house, and weighs less than 4 kg.

A good and reliable solution for the bathroom. It has everything that is required from a high-quality flow-through heater of a non-pressure type: average power, sufficient performance for an intense shower, simple mechanical operating mode switches. The device is equipped as if it was specially designed for the bathroom: the manufacturer offers a gooseneck faucet and a flexible hose with a shower head.

A unique device from the Swedish brand was developed for the kitchen. Here is a top connection for mounting the device under a countertop, moderate energy consumption and performance sufficient for domestic needs. At the same time, the water heater is designed for several consumers. Therefore, it can be placed in such a way that it supplies water to the sink and the bathroom washbasin at the same time.

The device is very reliable. The heating element is a spiral type with a special mechanics of operation: it vibrates when voltage is applied. This prevents scale from settling, resulting in a very long service life of the device.

Completes the rating convenient device for singles or a family of two. This water heater will fully satisfy the needs of such a target group. There is everything for universal use here. For example, you can install this device for hot water supply to a bathroom or install it at the entrance to an apartment (several consumers are allowed). Reliable copper heating elements will ensure durability, and setting the outlet water temperature with a simple movement of the dial is a very convenient option.

As a conclusion

There is a lot of talk about flow-through heaters, but always one-sidedly. The attitude towards this device can be described in one phrase: “don’t like it? You just don’t know how to cook it.” Whatever modern views flow heaters no matter considered, each will require an integrated approach. It is enough to provide the device with a reliable power source, evaluate water consumption and select the appropriate model, as well as connect it where it will be most effective. And then the purchased heater over many years of operation will never make you disappointed in yourself. You just need to go to the store and know what to look for when purchasing.

Today, instantaneous water heater models are in great demand among buyers. This is primarily due to their compactness. At the same time, they are not inferior in performance to storage types. It should also be taken into account that the energy consumption of flow-through modifications is very low. There are quite a few manufacturers on the market.

IN Lately The range of instantaneous water heaters is greatly expanding. They differ in their characteristics and controls. You should also take into account the rather serious variation in the price of the product. In order to understand how to choose an instantaneous water heater for an apartment, you should familiarize yourself in more detail with the basic parameters of the devices. Additionally, you should know the main components of the model.

How does a water heater work?

At the bottom of the device there are inlet and outlet pipes. They may differ in diameter. Above the pipes there are filters. Next, a special anode is installed, above which the heating element is located directly. There is a special gasket under the thermostat. The mounting board in the device is installed above the control unit.

Hot water is removed through a heat exchanger. The heating element probe is located near the flow sensor. Additionally, the water heater includes a housing, a power supply with a switch and thermal insulation sheets.

Important device parameters

First of all, for instantaneous water heaters, the power of the device is taken into account. Additionally, the documentation indicates such a parameter as performance. Power supplies, in turn, have their own characteristics. In this case, it is important to note the maximum voltage and frequency of the instantaneous water heater. The pressure sensors in the device can withstand different pressures.

If we consider two-valve modifications, then the above parameter fluctuates on average around 3 bar. The protection system is most often installed in class IP30. This tells the buyer that the device’s power supply is protected, and the model will not have problems with overheating. Another interesting indicator is considered to be maximum temperature. Last but not least, the dimensions of the device should be noted.

How to decide on a purchase?

In order to understand how to choose the right instantaneous water heater for an apartment, it is necessary to assess the load that will be placed on the device. If no more than three people live in the apartment, then the maximum power of the model should be approximately 12 kW. All this will allow the performance parameter to be kept at the level of 3 liters per minute.

The maximum temperature must be at least 50 degrees. Also, the choice of instantaneous water heater for an apartment should be based on the parameters of the power supply. In the device it is most often set to 220 V, and its frequency can be around 20-30 Hz. If your home has certain problems with voltage surges, then it is better to select a 30 Hz model. The protection system should be marked IP 30. It is better to select probes of the anti-corrosion type, because they can last quite a long time. Heating elements are most often installed in a shielded type. However, recently, manufacturers have also begun to produce soapstone analogues. In this case, it is quite difficult to give preference to any modification.

If you choose a budget option, then it is better to choose a shielded heating element. In order for a technician to easily connect the device to the water supply system, the inlet and outlet pipes must be 2.3 cm in diameter. A good instantaneous water heater will cost around 5 thousand rubles.

Reviews of Electrolux models

Instantaneous water heaters (electric) for apartments of the presented brand are distinguished by fairly high-quality protection systems. According to buyers, the models are absolutely not susceptible to overheating.

Additionally, it should be taken into account that their average productivity is 3 liters per minute. Thus, the models of the presented company are well suited for large families, this is confirmed by users.

However, in terms of performance, there are also more modest instantaneous water heaters on the market. Their maximum power is on average 5 kW. They are very compact in size. As for the design, many note that everything is beautiful here, the lines are smooth. A good instantaneous water heater will cost the buyer around 5 thousand rubles.

Advantages of the Electrolux 20T model

This instantaneous water heater for an apartment has good reviews. Many buyers choose it because high performance at 4 liters per minute. This model is suitable for a family of five people. The heat exchange zone of Electrolux 20T is very extensive. If we talk about the power supply, then the maximum voltage it can withstand is 230 V.

Thus, if there are certain overloads in the electrical wiring in the house, this device able to withstand them. There are only two operating modes. According to buyers, the electricity consumption in this case is 3 W per hour. Many people note its economy. The hot water outlet pipe has a diameter of 2.5 cm. The thermal insulation of the device is installed with a thickness of 2.1 mm. The presented instantaneous water heater for an Electrolux apartment costs about 4,500 rubles on the market.

This instantaneous water heater for an apartment is unique, and its power is as much as 12 kW. It uses soapstone heating element. Thanks to this, the device’s productivity reaches as much as 4 liters per minute of use. The instantaneous water heater is controlled by a push-button type. There are three modes in total. The user can set the maximum temperature to 50 degrees.

The power supply installed is of fairly high quality, and is absolutely not afraid of overloads. In this case, its operating frequency parameter is at the level of 25 Hz. The unit has a thermal switch. The heat exchange zone is quite extensive, and the thickness of its thermal insulation is as much as 1.5 mm. The manufacturer provides a protective gasket under the thermostat. Separately, it should also be noted the reduced noise of this model. This was largely achieved through the installation of a high-quality casing.

According to buyers, the instantaneous water heater makes virtually no sounds during operation. At the same time, there is also no vibration. The Electrolux 35S is more than simple to install. The pipes in the lower part are standard, and are suitable for the water supply system of the house. Fastening to plastic outlets is permitted. This instantaneous water heater costs about 5,100 rubles in the store.

Water heater "Electrolux 30S"

According to customers, Electrolux 30S is the best instantaneous water heater for an apartment among budget models. Its heating element is of a shielded type. Its length is exactly 7 cm. The mounting plate in this case is located above the control unit. Due to this, manufacturers were able to significantly expand the heat exchange zone. It should also be noted that the model performs quite well.

According to users, it is suitable for a family of four. The maximum temperature on the panel can be set to 50 degrees. The power supply is programmed to switch between two modes. This instantaneous water heater for an apartment costs around 4 thousand rubles.

Consumer opinion about Thermex devices

Many models of the presented brand do not have gaskets installed under the thermostat. As consumers note, this element can wear out quickly, and this should be taken into account. If we talk about the advantages, it is important to note the high power of the device. However, its operating frequency parameter does not exceed 25 Hz. The mounting plates installed in instantaneous water heaters are the most common ones, and they can withstand average loads.

The blocks have thermal switches. Buyers also note fairly high-quality regulators. In general, the models of this brand are distinguished by their versatility, and they have quite a lot of modes. Due to this, instantaneous water heaters can be safely called universal. It will cost good model on the market around 6 thousand rubles.

Features of the water heater "Termex S600"

This instantaneous storage water heater for an apartment is valued by many buyers for its versatility. As mentioned earlier, the devices of the presented company have many different modes, and this copy is no exception. The user can select a maximum temperature of 50 degrees. The pipes in this instantaneous water heater are of standard size.

However, before purchasing, please note that plastic pipes It is better not to mount the device. This is due to the fact that the clamps are installed quite rigid. In this case, wear of the plastic outlets will be inevitable. This was noted by many craftsmen involved in installing such equipment. If we talk about the advantages, then a reliable protection system also deserves attention. In this case, it is installed as IP 30. Thermal insulation sheets used in the device are exactly 2 mm thick. The Thermex S600 model has a copper heating unit. This instantaneous water heater for an apartment costs approximately 5,800 rubles.

New model "Termex W200"

Many buyers value this instantaneous water heater for apartments for its compactness. The productivity of the device in this case is at the level of 3 liters per minute. All this became possible thanks to the installation of a shielded heating element. Its total length reaches 7 cm. All fasteners for mounting the model are included in the standard kit. The diameter of the outlet of the pipe is 2.7 cm. The thermostat probe is exactly 6 cm long.

The control unit in this case is installed of a multi-channel type. In total, the device is designed for six different modes. Thus, the performance of Thermex W200 will change. When using turbo mode, power consumption is exactly 3 W per hour of operation. The presented compact instantaneous water heaters for an apartment will cost the buyer around 5,700 rubles.

Review of "Termex S350"

According to experts, this model, among other devices, is distinguished by the presence of a shut-off valve. Thanks to this, this instantaneous water heater for an apartment can withstand a maximum pressure of 3 bar. The design is simple, but it will look great in an apartment. The Thermex S350 model weighs exactly 5 kg. One of the features that should be noted first of all is the high-quality thermal switch. When the system overheats, it helps quite well.

Additionally, it is important to mention the quality of the control unit. In total, the device allows you to choose from seven different modes. There is also a turbo function, which some users consider to be a significant advantage. The user is also able to operate the presented instantaneous water heater in an economical mode. The nominal capacity of the device is 3 liters per minute. This model is suitable for a large family. The only disadvantage we can note is the high cost of the product. On the market they are asking about 6,100 rubles for it.

What do they say about the "Vailant" models?

Many models of this brand are equipped with manual switches. They use mesh type filters. The outlet valve of the heat exchanger can withstand a maximum pressure of 4 bar. The casings of the heating elements are quite dense. Due to this, their noise level does not exceed 45 dB. The protection system for instantaneous water heaters is available in the IP30 series. Models use thermal insulation sheets with a thickness of at least 2 mm. Protective gaskets are installed under thermostats by the manufacturer. If we talk about the disadvantages, then experts mention the rather complex setup of models. This is due to the fact that the control units have quite a lot of functions.

Probes, as a rule, are mounted specifically anti-corrosion. If the water used in the house is of poor quality, then this is a great advantage. However, this element is displayed quite significantly on the price. Heating systems are mainly installed with a length of at least 7.5 cm. The cold water pipe has a diameter of exactly 2.3 cm. Water heaters of the presented brand do not have flow sensors. A good model will cost around 5,400 rubles.

Water heater "Vailant VED12"

This instantaneous storage water heater for an apartment has mostly positive reviews. According to buyers, this model has a high-quality manual switch. The control unit in this case is installed as a multi-channel model. The owner is able to use the economy mode. The electricity consumption of "Vailant VED12" is a maximum of 2 W per hour.

The performance of the presented instantaneous water heater is at around 3 liters per minute. This model has a mounting plate. According to experts, the Vailant VED12 instantaneous water heater can only be installed using fittings. It does not have flow sensors. Also of note is the rather small cold water pipe. Due to this, the user may experience certain problems when installing the device on the wall.

The manufacturer provides only mesh type filters. They are installed at the instantaneous water heater under the control unit. The owner can set the maximum temperature to 55 degrees. In this case, probes are used with a special anti-corrosion coating. The presented instantaneous water heater for an apartment costs around 5,200 rubles.

Model "Vailant VED24"

If you believe the reviews of the owners, then this instantaneous water heater is ideal for a small family.

Its probe is installed of an anti-corrosion type. In turn, the heating element is shielded and its length is 7.2 cm. A protective gasket is installed under the thermostat. Thermal insulation sheets are used with a thickness of 2 mm. The control unit of the presented model is of a multi-channel type.

Due to this, the user is able to select different operating modes. In this case, the manufacturer provides a push-button setting. This instantaneous water heater costs about 5 thousand rubles.

The presence of hot water is one of the indispensable attributes of a comfortable life. Citizens are so accustomed to such conditions that temporary shutdowns of hot water supply bring a lot of inconvenience. There is also not enough hot water outside the city, in dachas. An electric instantaneous water heater can solve this problem. This device can supply hot water not only on a temporary, but also on a permanent basis: you can build a hot water supply system for a private home.

Principle, structure and operating features

An electric instantaneous water heater is a small device that heats the water flowing through it. The heating element is a heating element (tubular electric heater) or an open spiral. Heaters with heating elements are more common - they are safer and the heating element is easier to replace. In very compact models - faucet attachments, etc. — there is simply nowhere to put the heating element, so an open spiral is used.

The device starts working when a flow appears (the tap opens), and turns off when the flow disappears. The set temperature is reached in a few seconds, after which it is maintained constantly (if the heating element has sufficient power).

Externally, an ordinary instantaneous electric water heater is a small plastic case connected to cold water and electricity. Has one outlet for hot water. Depending on the purpose, it can supply hot water to one (individual) or several (system) distribution points.

What parts does an electric instantaneous water heater consist of?

The structure of an instantaneous water heater is simple; it contains the following elements:

• Cold water inlet. It is connected to the water supply, usually with a flexible braided hose.
• Flow sensor. Monitors the appearance of water in the device (the tap is opened) and turns on the heating element. It also turns off the heating when the flow stops (the tap is closed).
• Tank with heating element. A small container, inside of which there is a heating element curved in the form of a spiral. This is where the water is heated.
• Hot water outlet. From the tank with water goes a tube through which heated water is discharged.

As you can see, the device is simple. There is also a control panel on the lid, where the conductors from the flow sensor and heating element are routed - so that you can adjust the operating mode and monitor the status of the device (power-on indication).

Types and connections to water supply and electricity

There are two main types of instantaneous electric water heaters: pressure and non-pressure. Pressure pumps are also called system pumps and often have the word Sistem in their name. They connect to the gap water pipe, as a rule, have greater power and can provide hot water to two or more water points.

Gravity or individual instantaneous water heaters are connected as usual Appliances- through a flexible hose or a water pipe outlet. They supply one point with heated water, have relatively low power (3-7 kW) and low cost. They exist in different forms:

If you need to wait out several weeks of hot water supply outages, you can install an individual non-pressure electric instantaneous water heater of any type. If a constant supply of hot water is required, it would be more rational to install a pressure unit.

Connecting a pressure water heater to the water supply

Pressure or system electric water heaters are connected to existing system water supply in a pipe rupture. They cut in using a tee, which installed before the first branch. Shut-off valves are installed at the inlet of cold and hot water Ball Valves. They turn off the device if there is a centralized hot water supply. These taps are also needed so that, if necessary, the device can be removed for repair or replacement.

Quality tap water leaves much to be desired and it is better to embed the heater after the filter. If there is no filter at the entrance to the apartment, it is advisable to install it either immediately after the branch to the apartment, or before the water heater.

In a private home, such a unit will work if there is pumping station or a self-assembled system with a hydraulic accumulator. It cuts in after all the filters, and the output is routed to consumers.

Connecting gravity to water

A non-pressure (individual) electric instantaneous water heater of a standard type is connected like a regular household appliance. There must be an outlet from the water supply with a tap and thread at the end. Using a flexible braided hose, the device is connected to the water supply.

Faucet attachments for heating water are a small group. They are basically screwed onto the threads at the end of the spout (gander). To do this, first unscrew the mesh that is usually installed there.

Some time ago there were quite a lot of them, but they were characterized by low efficiency. The nozzle itself is quite large and you can’t attach it to a low crane—it gets in the way. TO In addition, taps with electric water heating have appeared on the market, which heat water better, have the ability to adjust the temperature and are more convenient to use. They are installed in place of a regular faucet on a sink or sink. The only difference in installation is the need for an electrical connection.

Electrical connection

Any electric instantaneous water heater is a powerful and Requires a separate power line. As an exception, you can connect it to the line that goes to the electric stove - the line is suitable according to the parameters. Only in this case, you need to make sure that the stove and instantaneous water heater do not start working at the same time, otherwise the machine will work due to overload.

The connection of an instantaneous electric water heater is standard - from the panel, the phase from zero is connected to a two-contact RCD (it is necessary to disconnect both phase and zero), then the phase is also connected to the machine and only after that is supplied to the consumer.

The connection itself can be made via a three-pin plug and socket with a mandatory ground connection. You can also install a contact plate or connect a cable directly to the appropriate heater inputs.

Draw the power supply line with a copper wire (solid core):

• up to 7 kW cross section 3.5 mm;
• from 7 to 12 kW - 4 mm.

The machine is selected according to the maximum current consumption (available in technical specifications). Take the nearest higher rating (if you take the smaller one there will be a lot of unnecessary operations - every time you switch to maximum power). The RCD is taken one step higher in rating, the leakage current is 10 mA.

Read more about selecting the ratings of circuit breakers.

Control type

You can adjust the operation of the electric water heater (change the degree of heating) using several regulators that are located on the control panel. Control can be hydraulic or electronic.

An electric instantaneous water heater with hydraulic control heats the water to a certain number of degrees. It always turns on maximum power, even if it has several different heating modes. And even if one of the modes was set before turning off, it will turn on again from the maximum.

It also has one more feature - it heats the water by a certain number of degrees. You must change the degree of heating manually - switching modes after turning on. Moreover, the maximum temperature delta is most often 25°C. That is, if you have water at the inlet of +5°C, then at the outlet of such a device it simply cannot be warmer than +30°C (with full flow). This does not mean that the unit is broken or is not working correctly. This means that it simply cannot make it warmer. You can slightly correct the situation by reducing the pressure, then you can achieve a slight increase in temperature, but in such conditions you will not get fully hot water from such a unit.

Electronically controlled units usually have more power and a significantly higher price. This is due to the fact that they have heating elements with multi-stage power adjustment, and they are more expensive. In addition, the “filling” of such a device is more complicated - there are several sensors, and it also contains a microprocessor that processes data and regulates the operation of the heaters. If the unit is selected correctly in terms of power, it will be able to maintain the set temperature (usually up to 40°C) with a deviation of one degree.

Selecting an electric instantaneous water heater by power

Whatever type of electric water heater you choose, you need to choose the right power. That's right, in this case, it's so that it meets your expectations. The easiest way is to focus on the number of taps that will require a simultaneous supply of hot water:

Not all electrical networks can withstand such power. Often the total allocated power per house or apartment is much less. In this case, it is worth considering the possibility of installing less powerful individual instantaneous water heaters or. Great option- , but it is for those who have the ability to connect to the gas mains.

Selection by water consumption (performance)

You can choose an electric instantaneous water heater according to the required flow rate. There are hot water consumption standards for different consumers. By adding up the required consumption for your case, you will get the desired figure. So, average consumption:

When choosing, you must have the same power value and consumption. In this case, water at all flow points that can operate simultaneously will be supplied at the specified temperature. If not, you will have to make sure that only one tap is open at a time.

What the market can offer

The choice of electric instantaneous water heaters is at least large... You can easily get confused. What should you pay attention to besides power and performance? On the material from which the tank and heating element are made. The tank can be copper, stainless steel or plastic. This information is not provided by all manufacturers, but if it is not available, the filling is most likely made of plastic. It is, of course, heat-resistant, but not as reliable as metals.

Also pay attention to the minimum and maximum cold water pressure at which the unit can operate. There are capricious models that require a reducer to be installed on our networks to connect them.

We should also talk about taps with electrically heated water. They are also called a water heater faucet. They appeared not so long ago, but are quickly gaining popularity because they are easy to use and easy to connect.