How to choose an electric instantaneous water heater. Selection by water consumption

They have such significant advantages over storage ones as compact sizes and instant water heating. But connecting them requires a separate electric cable and a circuit breaker on the shield.

Therefore the installation flow heaters limited in apartments of multi-storey buildings of old buildings - here you can install a heater with a power of no more than 3.5 kW.

Calculation of required power

The power of a water heater can be determined by knowing the exact list of purposes for its use. For this You can use the table, which shows the approximate volume of water required for various needs:

The power of an instantaneous electric water heater is calculated using the formula:

P=G*∆t/14.3 where:

• P - heater power, kW;
• G - flow rate (flow), l/min;
• ∆t - required temperature increase, º C; ∆t = T- tin;
• T - desired (required) outlet temperature, º C;
• tin - cold water temperature, º C; (winter) +5º C, (summer) +15º C.

This indicator can be determined more simplified method- simply divide in half the power of the water heater you like. The result is a fairly accurate water flow (in l/min) when heating it by 20-30º C. For clarification, here is an example: a 16 kW water heater will provide a water flow of 8 l/min, which is quite enough for taking a shower.

If hot water needed at several points, not just for the shower, then you need to focus on the capacity of the largest water intake point. If it is necessary to use these points at the same time, then the power of the selected instantaneous water heater must be increased by at least one and a half times.

Based on these calculations, it becomes clear that you can get a lot of hot water at once with a small instantaneous water heater if its performance is at least 8 kW.

This is only possible in new houses and houses with installed electric stoves. More powerful instantaneous electric water heaters (from 12 to 36 kW) are installed in country houses and cottages with specially designed and installed electrical equipment to ensure the ability to provide consumed electrical power. In this regard, single-phase and three-phase instantaneous water heaters.

Pressure and non-pressure instantaneous water heaters

Flow-type water heaters are also divided into pressure and non-pressure. Pressure electric heaters(they are also called “system”) allow you to use water from any tap installed in the house. They are embedded in hot and cold water pipes. This is convenient during the period when the centralized hot water supply is turned off. Switching on and off of such a water heater occurs automatically; it reacts to the flow of water.

The set of non-pressure flow-through heaters, which are available with power from 3.5 to 8 kW, includes shower and kitchen attachments. They work only at one water intake point. Such heaters are convenient to use in summer time in the country.

The cost of non-pressure instantaneous water heaters is low, and in most cases they are all included kitchen faucet or shower head. And if the water intake points are remote from the water heater, it is profitable to buy them for each water intake point separately - this will significantly save electricity on heating water in the pipes. That is why such water heaters are often purchased for summer cottages.

Since a gravity heater cannot provide a large amount of water, the holes in the shower heads of the heaters are specially made very small to ensure a stronger stream. If the water is very hard, it is necessary to rinse the nozzles more often with a descaling solution, otherwise the holes may become clogged and overheating of the device will be inevitable.
Most non-pressure instantaneous water heaters with low power are structurally designed for use in countries with warm climates, where average annual temperature fluctuations are small.

Therefore, in winter middle lane they will be ineffective since they can heat water to no more than 30º C.

Review of brands and manufacturers. Price comparison

In the market of electric water heaters, instantaneous heaters are represented by the following manufacturers:

1. Electrolux and Timberk (Sweden);
2. AEG, Clage (Germany);
3. Thermex (Italy);
4. Redring (England);
5. Kospel (Poland).

Let's compare the characteristics and prices of some well-known brands

Instantaneous electric water heaters Electrolux

Electrolux produces several series of heaters of varying performance, which are equipped with additional functions.

Swedish brand water heaters equipped with an efficient heating coil element, reliably protected from scale. Expensive models are equipped with a highly intelligent control system.

Instantaneous electric water heaters Thermex

The heating element of Thermex devices is equipped with a special ceramic filler, and the flask is made of copper High Quality. Water heaters of this class produced by the company - optimal ratio in terms of price and quality.

Instantaneous electric water heaters Kospel
The Polish company produces mainly system models, but also several brands of non-pressure heaters - the STREAM and EPJ series (small with mixing fittings). Components in contact with water are made of high-quality brass and copper. Kospel instantaneous water heaters have a nice design, are modern, and their service is low-cost.

Let's sum it up

Having decided on the power of the electric heater, before ordering in an online store or going to a specialized store, it would be useful to:

1. Check with your service provider about network capabilities., to which the house is connected, and what additional electrical equipment will be needed to connect the selected instantaneous electric heater.
2. Determine the complexity of installing the device and understand whether it is possible to cope with it yourself or whether it is necessary to invite specialist electricians and plumbers, find out the cost of installation work and installation.
3. Before choosing an electric instantaneous water heater It’s worth asking about warranties, availability of replacement parts, and their cost. and find out where the service centers closest to your home are.

This will help save time, effort and money.

To consolidate the information received, I suggest watching the video:

The presence of hot water supply is one of the main signs of a comfortable home. Instantaneous water heaters running on electricity make it possible to fully provide people living in a private house or apartment with water heated to a certain temperature. What water heaters of this type are, as well as which model to choose, will be discussed in detail in this article.

Electric instantaneous water heater: operating principle

Instantaneous electric water heater

A instantaneous water heater is a device in which the liquid is heated while it moves. The main advantage of such water heating installations is their compactness. Electric heaters also allow you to heat the liquid almost instantly, which is especially convenient when installed in a country house, when the housing is not used on a permanent basis.

An instantaneous water heater consists of a small volume flask in which a heating element is located. Water, passing through the flask, is heated to a certain temperature, after which it flows to the water dispensing points. To prevent water from boiling, as well as to turn on the device in a timely manner, the device uses various sensors and relays. To ensure electrical safety, the water heater body must be connected to the grounding contact of the wiring.

Depending on the power of the device, the water heater can be installed at one water point or have distribution to all consumers of hot liquid.

What types of flow heaters are there?

Flow-through electric heaters are divided into the following types:

• Pressure.
• Non-pressure.

Pressure devices are suitable for providing multi-storey building With big amount water collection points, but this type of heater will only work if a fairly high pressure is created in the supply water supply.

Pressure electric water heater

Non-pressure devices operate in plumbing system without significant pressure, but it will not be possible to use this type of heaters for several consumers. Typically, non-pressure devices are installed directly next to the faucet or shower. Many models have a built-in tap at the bottom of the water heater.

The device must be installed correctly, because if a non-pressure water heater is installed in a system where there is increased fluid pressure, then during operation the device may be damaged as a result of a rupture of the working shell.

Pressure and non-pressure devices may also have different type heating element. The device can be installed:

• Bare spiral

If the device uses a conventional heating element high power, then the formation of scale when using hard water can be the main reason for the rapid breakdown of the device.

TEN instantaneous water heater

An uninsulated spiral does not have this drawback, but during operation it can easily be damaged if there are air pockets in the plumbing system.

All instantaneous electric water heaters can be divided by type of control. The principle of regulating the temperature of the heated liquid can be as follows:

• Hydraulic
• Electronic

Devices equipped with hydraulic control are very reliable, but, as a rule, in such devices, to switch operating modes of the water heater, the toggle switch located on the device body must be mechanically switched.

When using electronically controlled water heaters, you can quite accurately set the temperature on the display, which will be maintained automatically.

An important characteristic of flow-through heaters is performance. It is expressed in the volume of water heated to a certain temperature for 1 minute. The greater the number of water points operating simultaneously, the greater the productivity should be.

Instantaneous electric water heater: pros and cons

Flow-type water heating equipment has disadvantages and advantages compared to the installation of other hot water supply systems. To understand the main pros and cons of instantaneous water heaters, the positive and negative characteristics of such devices will be discussed below.

1. Production of unlimited amount of hot water.
2. High liquid heating rate.
3. Suitable even for small room, because it does not take up too much space.

Compact flow-type water heating device

1. Water does not stagnate like in storage boilers.
2. Relatively low cost.

There are not many negative characteristics of instantaneous water heaters, but on inexpensive models they can be observed serious problems with correct water temperature regulation.

Water temperature adjustment

As mentioned earlier, instantaneous water heaters can have mechanical or electronic control heating the liquid. Regardless of the type of device used, the device must be operated at the correct temperature conditions:

• For a shower - 40 degrees.
• For washing dishes – 45 degrees.

This value of hot water temperature allows you to achieve not only comfortable use flow equipment, but also significantly save energy. Despite the increased power of this type of water heating devices, the cost of hot water supply is reduced due to the short operating time of the device.

How to choose an electric instantaneous water heater for an apartment or shower

From the right choice water heating device will depend not only on ensuring hot water V required volume, but also the duration of operation of the device. When choosing a flow device for installation in an apartment or in a private house the following principles must be followed:

• Power device must not exceed the maximum permitted current value. If an overly powerful device is installed, then when the hot water tap is opened, an emergency shutdown of electricity is possible. If you need to provide hot water big house, then in this case it is recommended to choose a three-phase device. Before purchasing such a device, you should also make sure that it is possible to connect a three-phase electrical network.
• Control type the device also has a significant impact on the final decision in favor of purchase a certain model instantaneous water heater. The electronic option for regulating the water temperature allows for more precise setting of this parameter, as well as changes in heating using remote control management.
• Appearance devices, as well as quality paint coating is not the least important when choosing an instantaneous water heater. With equal technical indicators, preference should be given to a model that fits perfectly into the design of the room.

Fits perfectly into any interior

If a water heater is purchased for installation only in the bathroom or kitchen, then it is enough to purchase a device with a power of about 5 kW. The cost of the flow device, in this case, will be only about 2,500 rubles.

In order for water heating equipment to serve for many years, without any deviations in operation, it is recommended to purchase devices from well-known manufacturers.

Top 5 models of instantaneous electric water heaters

You can simplify the process of choosing a high-quality instantaneous water heater if you follow the recommendations real buyers this type electrical appliances. The following models are most popular among the population:

Electrolux Smartfix

Electrolux Smartfix

Powerful, compact and inexpensive water heating device. The water heater capacity is 3.7 liters per minute. Hydraulic system device control allows you to select 1 of 3 temperature modes. Electricity consumption when switching modes also changes accordingly. The device has a built-in overheat protection system, as well as a set consisting of a water tap, shower hose and nozzle. The main disadvantage of this device is the only inability to connect more than 1 water point. You should also take into account the fact that a water heater of this model will only work if a minimum liquid pressure of 0.04 bar is provided in the water supply.

Timberk WHEL

This flow model electric water heater from a famous Scandinavian brand has excellent performance characteristics. Despite the limitation in using the device at more than one water point, the device is very popular among buyers due to its low cost and high performance. At the same time, the compact dimensions of the device allow installation anywhere in the bathroom or kitchen. The weight of the device is also small and is only 1.19 kg. This device allows you to heat water from 16 to 60 degrees with an intensity of up to 4.5 l/min, but only if connected to a water supply with a minimum pressure of 0.03 Bar.

Hyundai H-IWR1

Instantaneous water heater designed for installation at only one point of consumption. The device is equipped with standard nozzles, so it can be used immediately after connecting to the water supply system and electrical network. The productivity of the water heating device is 3.6 l/min with a power of 5.5 kW. The flow device has built-in overheating protection, so the entire control process consists only of mechanical installation maximum water heating temperature.

CLAGE CEX 9

The CLAGE CEX 9 water heater is designed to operate under high pressure, so it can be installed in such a way that all water points can be supplied with sufficient hot water. Of course, high productivity is reflected in the cost of water heating equipment. The price of a water heater of this model is approximately 10 times higher than small models installed directly at the water point. The power of water heating equipment is set at the installation stage. The heater can operate in 6 or 8 kW mode, but even with increased power the device, for normal operation, a voltage of 220 V is sufficient.

STIEBEL ELTRON

A 24 kW instantaneous water heater allows you to provide one or more water points. The heating capacity is at least 12 l/min, with a difference of incoming and outgoing liquid of 28 degrees Celsius. Thanks to the installed heating element made of high-quality copper, it is possible to achieve trouble-free operation of the device for a long time. Also, the water heating system has built-in protection against overheating, which will also allow the device to remain operational in the event of a failure of the main heating-regulating elements. Having a failed three-phase current, is a prerequisite for connecting STIEBEL ELTRON , therefore, choose this type of instantaneous water heaters only for installation in a private home.

The difference between a instantaneous water heater and a storage water heater lies, first of all, in the rapid heating of water, while the amount of hot liquid can be unlimited. These are the main advantages when choosing autonomous system hot water supply of this type.

An immutable attribute modern apartment or at home is the availability of hot water, the centralized supply of which is very unreliable. The solution to this problem would be to install an additional autonomous source, for example, an electric instantaneous water heater.

The operating principle of such a water heater is simple and effective - cold water passes through the heating device of the device, where the TEN almost instantly heats it to an acceptable temperature - 40-60 degrees. Moreover, such devices do not require constant heating, as in boilers.

Electricity is used only when the tap is opened, and after it is closed, this device turns off the heater and consumes absolutely no electricity. It is not only convenient, but also economical.

What should you consider when choosing?

To choose the right water heater, you need to decide how it will be used. Its type will depend on this - there are three of them:

• non-pressure;
• pressure;
• faucet - heater.

What type of device to choose is up to you. This will depend on the characteristics of your water supply and needs, but we will tell you what nuances you need to take into account so as not to be disappointed with the purchase.

The choice, in general, comes down to selection required power, on which productivity directly depends. We'll tell you how not to make a mistake here.

When choosing, you need to consider the following parameters:

• required productivity l/minute;
• required outlet temperature, in degrees.

You can choose the right water heater performance from the average data in the table.

The next step is to determine the required heating temperature.

The temperature considered comfortable is:

• for shower – 38 degrees;
• for washing dishes and taking a bath – 45 – 55 degrees.

To the above, we add that the performance of an instantaneous water heater is strongly influenced by the temperature of the water at its inlet - the lower it is, the more powerful the device is required. Based on this, when choosing, you should start from the temperature tap water V winter time– no more than 6-7 degrees.

Separately, we would like to note that the standard electrical wiring an apartment will withstand no more than 3 kW of load, so to connect devices 6 kW or more you need to provide a separate reliable cable:

• 3 kW – copper wire cross section of at least 1.5 mm;
• 4 kW – 2.5 mm;
• 6 – 8 kW – 6 mm;
• 12 kW – at least 10 mm square.

You can choose the manufacturer and model yourself, according to your taste, taking into account user reviews.

Characteristics of the most popular devices in Russia

STIEBEL ELTRON DDC 80 E

A high-quality German device with decent functionality.

AEG MP 8

It is worth choosing for limited spaces.

Rating – 9.0 on a scale of 10 points.

POLARIS MERCURY 5.3 OD

The best price-quality ratio.

ELECTROLUX SMARTFIX 6.5 T

Rating: 8.5 on a scale of 10.

BOSCH ED12-2S

German reliability and thoroughness.

Rating – 9.5 on a scale of 10 points.

TIMBERK WHEL-7 OC PRIMALUX

Best in economy class.

Rating – 10.00 on a scale of 10 points.

ELECTROLUX SP 21 ELITEC

Powerful device to meet your big needs.

Very often in multi-storey buildings There is a problem of lack of hot water. What's left to do but buy. It is best to purchase electric ones, they are more reliable. But which one to choose: flow-through or storage? For constant use It’s better to take a flow one, it heats as much water as you spend. We’ll talk about how to choose and install instantaneous electric water heaters in this article.

What is an electric water heater

An instantaneous water heater is a small box equipped with heating element(Tenom), passing through it, the water heats up without accumulating in the tank. That is, the water begins to heat up only at the moment it passes through the water supply. Some models are equipped with a thermostat to regulate the temperature.

Electrolux instantaneous water heater

Water heaters can be electronically or hydraulically controlled. The first is the most convenient; it monitors and supports all work processes. As a rule, such devices have LCD displays on their housing, which display on/off indicators, heating temperature, flow rate, power, etc. Hydraulic is a simpler option, it works from a flow sensor. When the user turns on the tap, the heating element starts working and the water heats up. When the water is turned off, the operation of the heating element is automatically turned off.

Attention! With hydraulic control in water heaters, the water temperature depends on the power of the water heater and the flow rate.

Main characteristics of electric instantaneous water heaters

When buying a new heater, you need to carefully study the technical characteristics of the selected model, the method of mounting and control. This is necessary so that you can install this unit and it meets your desires. What exactly you need to pay attention to when purchasing:

Instantaneous water heater design

• Power. An instantaneous water heater consumes a lot of electricity, it requires separate electrical wiring, and it itself must be grounded. Low-power heaters operate from standard network 220 V, but more powerful ones (from 12 kW) need to be connected to three-phase network at 380V.

Attention! If the declared power of the device is more than 5 W, then it may not be suitable for installation in an apartment.

• Pay attention to the type of instantaneous water heater; they are either pressure or non-pressure. If the unit is pressure, this means that it works due to pressure. It must be installed in the riser of the entrance or cottage.
• Before purchasing a water heater, find out what the maximum water pressure is supplied to the house. It is necessary that it be from 0.6 to 16 atmospheres. If the pressure is unstable or too strong, choose models that have a safety valve that turns off the water heater at the right time. If the water pressure is too low, experts advise purchasing a storage heater to avoid burnout of the unit.
• You can often see the word “protection class” in the description. This phrase means the quality of the body of your unit. The abbreviation IP stands for standard for protecting electrical equipment from harmful influences. environment, and subsequent numbers indicate protection against damage from solid objects (first digit) and water (second digit). Example: IP 25, indicates that the heater body is protected from finger contact and water splashes.

Connection diagram for instantaneous water heater

• Be sure to check how the water heater is installed. Installation can be vertical or horizontal, or mixed, i.e. installed in both ways.
  Also pay attention to the type of water supply. If the unit is installed above the faucet, then you need to choose the bottom type of connection, and if under the washbasin - the top type of connection. In the first case, the pipes are directed downwards, in the second - upwards.
• Make sure that the selected device has a water superheat mode. It protects the heating element from excessive heating, turning it off in time. This will protect you from unexpected fires.
• Some heater models operate in combined mode. For example, if a small amount of water is needed, they are used as a storage unit, if a large flow rate is needed, they are used as a flow unit. This allows you to save electricity.

This type of heater does not provide for a tap, only an inlet and outlet for water, but it can be connected to several faucets simultaneously. If the hot water supply is turned off, you can get heated water anywhere in the apartment where there is a tap. Typically the units are installed under the sink. It turns on automatically, and depending on the manufacturer, it can be single-phase or three-phase.

Instantaneous pressure water heater

Main advantage pressure water heaters– this is support desired temperature water and the ability to work with high blood pressure, and the disadvantage is high energy consumption. It is also convenient to work with: you do not need to turn on the heater separately, the water supply is regulated by a valve on water tap. Such units maintain water temperature in the range of 30-60 degrees.

In this type of heater, the pressure does not exceed external atmospheric pressure. Available in power from 2 to 8 kW. Capable of heating water for 1-2 points in the room. It is not difficult to use such units: you open the tap at the inlet, and when the water supply starts, turn on the power button of the water heater. The temperature is regulated by the water supply: the lower the pressure, the higher the temperature. As soon as the pressure of the water supplied to the unit decreases to 0.33 atm, the heater will automatically turn off thanks to the minimum pressure switch.

Non-pressure instantaneous water heater

The main advantages include:

• high efficiency and energy savings;
• overheat protection;
• low cost.

The disadvantage is considered to be low pressure and limited use (for no more than 2 points).

How to install an instantaneous water heater

Conventionally, the installation process is divided into 3 stages:

• Installing the device on the wall. The location must be chosen so that it is easy to use the heater, but at the same time it does not interfere with use of a washbasin or bathtub. The water heater must be mounted above your head. First you need to mark the mounting location. The unit must be positioned strictly perpendicular to the floor. Any curvature leads to the fact that the heating element will not be completely covered with water and will quickly burn out. At the marked points, drill holes and drive dowels into them, and then hang the device.

Installing a water heater on a bathroom wall

• To connect heater to the electrical network, it is necessary to make a calculation permissible load to the switch. It is calculated as the product of current and voltage. This calculates the sum of all appliances connected to the network, and also consider whether new equipment will be purchased in the near future. If the total power does not exceed the declared one, replace the circuit breakers with a current of at least 50 A. In the terminal block we connect the wires: to the phase - white, to the working zero - blue, to ground - yellowish-green.

Connection diagram to water supply points

• Final stage– connecting the heater to cold water. We connect the heater inlet to the shower head (indicated by an arrow pointing inside the unit). Move the mixer to the “shower” position and direct cold water into the heater. Connect the shower head from the kit to the outlet. It has thin nozzles that limit the amount of water supplied; if you use a regular nozzle, the flow will be large and the water will not have time to heat up.

Thus, thanks to the instantaneous electric water heater, you will always have hot water in unlimited quantity. Well, and what is important, the price of flow-through heaters is lower than storage heaters. And anyone can install it, the main thing is to carefully study the instructions.

Types of instantaneous electric water heaters: video

Instantaneous electric water heaters: photo

Flow-type electric water heating systems have significant advantages over storage devices. First of all, it is the perfect design and compact dimensions of the unit, allowing the equipment to be installed in small rooms. They also have a high speed of heating water, which makes household work easier.

In order to decide which is the best instantaneous electric water heater to buy, you should know that installing the device requires an individual electrical cable and a circuit breaker on the panel. Therefore, installation of equipment is prohibited in buildings of the old type of development. IN in this case It is recommended to use equipment with a power of up to 3.5 kW.

How to calculate the required power?

A good instantaneous water heater must meet not only the consumer’s criteria, but also the water consumption required to carry out all household processes.

The maximum value of the power indicator of an electric heating device is calculated according to the following formulation:

Decoding of component symbols:

• P - maximum power value of the device, kW;
• R - flow rate of circulating water, liters per 60 seconds;
• T is the required temperature regime of the liquid coming from the mixer;
• ∆t - required temperature increase, o C. ∆ t = T - tvx.
• Твх - temperature regime of cool liquid: cold season +5°С, hot season - +15°С.

These values ​​can also be determined more in a simple way. The performance indicator inherent in the most suitable option must be divided by two. The result will be the expected water flow rate in liters per minute at temperature conditions- 20-30°C.

For example, a device with an efficiency of 16 kW provides the user with 8 liters of heated liquid per minute. This amount will be enough to fulfill one of the goals listed in the table.

If it is necessary to distribute the water supply to several points, you need to focus on collecting the most frequently used water. If you plan to pick up at several nodes simultaneously, then you should select a high-performance unit.

It is recommended to install a 13-36 kW instantaneous electric water heater in residential buildings, where consumption is provided large quantity electricity. In connection with the division of classifications, two types of units were formed: three-phase and single-phase.

Pressure or non-pressure devices

In addition, the equipment has two groups of pressure and non-pressure equipment.

Pressure-type flow-through electric units make it possible to use water from any mixer installed in the cottage. The device is installed directly on the cold and warm outlet pipeline. This method is considered the most convenient in case of disconnection of the centralized water supply system.

Starting and stopping the operation of the device is carried out at an automated level, using a control unit that responds to the flow rate.

A set of the best instantaneous water heaters includes bath-shower and kitchen attachments. The parts function exclusively for one water pressure unit. This modification is most suitable for use in the warm season in a private home.

If water intake mixers are located on long distance heating equipment, it will be more profitable to purchase separate devices for each unit. This method will significantly reduce the energy consumption for heating the liquid in the pipes.

VIDEO: how the flow machine works

Since non-pressure technology is not able to provide the home with a large amount of liquid, the openings of the shower element are small. This way you can get good pressure.

If the coolant has a high hardness index, it is necessary to regularly wash the nozzles with a solution that removes scale.

Most non-pressure equipment is designed for use in countries with warm climatic conditions. The devices are not designed for harsh weather conditions, so they cannot perform well at low temperatures. The water will be heated to no more than 30 o C.

Review of popular models

The technical market presents a wide range of heating equipment from various manufacturers. To choose the right device, you should study the technical characteristics of the most suitable models.

Techniques vary according to technical specifications, performance and additional options. Aggregates Swedish company equipped with an effective heating element in the form of a spiral.

The instantaneous electric water heater on the tap has an expanded clay filter and a copper flask.

The Polish brand is one of the best instantaneous water heaters of systemic and non-pressure types. The parts that have direct contact with the fashion are made of copper and brass material.

The entire line of these units is equipped with an overheating protection system and has a safety valve. The front panel is decorated with a display, where there are temperature and on/off indicators. The main complaint from users is frequent shutdowns and periodic “shooting” of cold water.

When using, make sure that the device does not operate at full power. This leads to overheating of the wiring and possible short circuit.

The kit does not include a cable or plug. They are purchased separately. Recommended cable cross-section is 4 mm. A separate connection via the machine is required. The quality is excellent. In his price category This is a leader that is consistently included in the TOP 10 instantaneous water heaters.

The line of this manufacturer is equipped with a complete set:

• overheat protection;
• water filter;
• plug and wire for connection

In general, it is characterized as a medium-power, trouble-free device, easy to use and quite reliable. Due to its low performance, it does not require separate wiring, but for safety reasons it is not recommended to turn it on simultaneously with other powerful electrical appliances.

The WHE 4.5 XTR H1 model requires mandatory grounding. As for negative reviews, here many users agree on one thing - it’s inconvenient without an on/off button. First you have to open the tap and then plug the device into the outlet.

Before you order a 2016-17 water heater in an online store, you should first answer a number of questions:

1. Possibilities of the house in which the installation of the device is planned. Do they meet the requirements of the unit?
2. Decide on the installation method and, if you do not plan to carry out the process yourself, order an installation service from a specialist.
3. Check warranty periods and availability of spare parts.

In any case, regardless of the condition of the wiring, first of all, after purchase, they make a separate cable and connect it to the panel. It would also be advisable to check the condition of the water supply and connect the water heater using flexible hoses.

VIDEO: How to choose a water heater? Which one is better to buy?