How to choose a instantaneous water heater: a review of types of instantaneous water heaters and tips for buyers

What is an instantaneous water heater

Purely structurally, this device is a small container into which a heating element is inserted, connected to an alternating current network. Two pipes are also connected to the container. During installation, one is connected through flexible hoses to the water supply network, the second to the mixer. And this whole structure is enclosed in a beautiful case: metal or plastic.

The operating principle of an electric instantaneous water heater is as follows:

• as soon as we open the mixer to use hot water, water begins to flow from the water supply into the container with the heating element;
• the heating element itself immediately turns on;
• water, in contact with the latter, begins to heat up;
• and under pressure enters the opposite pipe, and accordingly into the mixer;
• closed the last one, the supply of both water and electric current to the device automatically stops.

Now you understand how a flow-through heater works. Let's move on to the selection criteria.

A diagram showing the operating principle of an instantaneous water heater Source spravkavrn.ru

Types of electric water heaters

In both storage and instantaneous water heaters, the main element for heating water is the TEN. It’s just that they heat up differently.

In storage water heaters, water flows into a special container, inside of which the heating element is located.

Using an adjustable thermostat, the temperature to which the TEN should heat the water is set.

Having reached the desired temperature, the TEN turns off, but if the temperature drops slightly, it turns on again and brings the temperature to the desired value. This way it keeps the water constantly heated.

When the water is partially consumed, a new portion of cold water enters the container from the water supply system to the level, and it is heated again.

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How to connect a storage water heater - diagrams.

Instantaneous water heaters do not have a water tank. Water entering the water heater passes through the supply pipe.

A housing with a heating element is attached to this pipe. Water passing through the pipe inside the housing heats up and goes through the outlet pipe to the consumer.

Selection rules

Let's start with the fact that this device is represented on the market by an enviable assortment. All companies that produce household appliances also offer electric instantaneous water heaters. Therefore, it costs nothing to get confused in all these models.

The first thing you need to pay attention to when choosing this device is the complexity of its design. The simplest device for an instantaneous water heater is a tank enclosed in a housing where the heating element is located. There are no additional options in it. That is, open the tap and get hot water at a certain temperature - 40-60C. These are small-sized units that are usually installed on one consumer, and more often on a kitchen sink.

On the market today you can find very simple models, which are faucets or mixers of unusual shapes and sizes. That is, the heating element is enclosed in the faucet body, which makes it possible not to install the two elements separately. The photo below shows just such a model.

Mixer with built-in heating element Source yandex.net

All other models have different control methods, and this is why they differ from each other. Here we need to talk about two varieties:

• with hydraulic control, also known as mechanical;
• electronic.

The first type is, in fact, the same simple model. But it has a built-in control unit with which you can regulate the temperature of the supplied water and its pressure. The control unit is presented in these models in the form of a step switch.

The operating principle of this type of instantaneous water heater is that, using buttons or levers on the control unit, a rod is set in motion, shutting off the water supply. That is, the rod either reduces the cross-section of the pipe or increases it. Accordingly, the pressure either decreases or increases. And since in instantaneous water heaters the pressure directly affects the temperature, accordingly, at low pressure the water temperature will be higher, and at high pressure it will be lower.

Water heater with mechanical control Source ekb-holod.ru

Such models are actually very simple, hence their low price. But it is precisely this simplicity that prevents precise adjustment of the parameters of the liquid passing through the device. In this regard, devices with electronic adjustment are more accurate. With their help, both the temperature and water pressure are set very accurately. Sensors are installed inside the control unit that respond to changes in these parameters, also changing them according to the previously established mode. This is a big plus that can be used wisely by choosing the optimal mode. For example, washing dishes will require a high temperature, while showering will require less.

Before choosing an instantaneous water heater from the models proposed above, you must take into account how many consumers the device will provide with hot water. If it is one or two, for example, a shower and a sink in the kitchen, then it is better to install a model with mechanical adjustment. If there are many consumers, for example, a sink in the kitchen, a sink in the toilet and bathroom, and more than one shower, then it is optimal to give your preference to a model with electronic adjustment. The only disadvantage of the latter is the high price.

Electronically controlled water heater Source masterwatt.nl

The best gas instantaneous water heaters

In buildings where there is gas, hot water supply can be installed using a flow-through gas water heater, popularly called a geyser. Inside the housing there is a coil with circulating water, which is heated by burners. Now such equipment is equipped with automation and the flame is started when the tap is opened.

Using such a flow-through device, the liquid can be heated even to 80 degrees, but installation requires connecting a gas line and a chimney. Some models may also require an electrical outlet for ignition. Products from our rating in this category are optimal for apartments and houses in gasified settlements.

Mora Vega 13

Rating: 4.9

This is one of the simplest instantaneous gas water heaters with a capacity of 13 l/min. For convenience, piezo ignition is provided (a sharp turn of the switch produces a spark). The device does not require electricity. Provides good temperature with a strong jet.

In the reviews, the owners confirm its simplicity and reliability, which led to an honorable place in the rating. If the connectors are hermetically connected, then maintenance in the form of membrane replacement will be required no earlier than after 5 years. The gas control works autonomously and turns off the supply when the flame dies out, and there is nothing else to break in it. It is suitable for several sampling points, but with alternate use.

Advantages

• no electrical wiring required;
• automatic activation when the tap is opened;
• protective functions in case of overheating or blowing out the flame;
• A pressure of 0.20 atm is enough to turn it on.

Flaws

• large column dimensions 400x659x261 mm;
• buzzes at maximum mode;
• piezo ignition does not always work the first time;
• open combustion chamber.

Electrolux GWH 11 PRO Inverter

Rating: 4.8

Flow-through gas heater with electronic control and display. It automatically maintains the desired outlet temperature and is equipped with electric ignition (no need to turn anything, just press the start button). Productivity is 11 l/min. The device is equipped with a thermometer and gas control. The startup and screen are powered by a battery, the charge of which is shown on the display.

We included the product in the rating because of its “smart” functions. Among other things, the electronic unit is equipped with flame modulation, which automatically adapts to the parameters of the jet. This is useful in homes where water pressure changes frequently, especially in the summer with seasonal watering of gardens. The gas water heater also received many positive reviews due to its increased protection - it will not turn on not only in the absence of water, but also if the draft in the chimney is lost.

Advantages

• touch control buttons;
• self-diagnosis;
• good package of security systems;
• display for easy setup.

Flaws

• when two points are turned on simultaneously, the pressure drops;
• after idle time, you need to flush hot water heated from the heat exchanger;
• dimensions 328x550x180 mm.

Zanussi GWH 12 Fonte

Rating: 4.7

Inexpensive flow-through model with a copper heat exchanger. Accompanied by informative instructions with a detailed description of all modes and security functions. The flow heats up to 11 liters per minute. In terms of heating power, this is comparable to 23.6 kW, which is suitable for several taps, for example in the kitchen and bathroom. Ignition occurs automatically when you turn the handle, but you will have to periodically change the batteries for this. The display shows the thermometer readings. The second handle regulates the throughput.

We included the water heater in the rating due to the low cost of the product with a good set of functions. The ideal price-quality ratio is complemented by a semi-closed combustion chamber protected by a fine mesh, which increases safety especially in a house with small children (so that they do not put anything in there).

Advantages

• battery ignition;
• copper heat exchanger;
• there are no heating fluctuations when opening the second tap;
• the stream is hot within 10 seconds.

Flaws

• weighs 9 kg and can only be attached to a brick wall;
• noisy work;
• you need to hold the switch down a little to activate the gas control;
• goes out when diluted with cold water.

Water heating device power

This is one of the main characteristics that you need to pay attention to when choosing an instantaneous water heater. Firstly, it should be noted that power, also known as productivity, is the amount of heated water that the device can heat to the required temperature in a certain period of time. Typically this parameter is measured in liters per minute - l/min.

For example, a low-power water heater has this characteristic equal to 3-5 l/min. This water is enough to take a shower or wash dishes. In this case, the water is heated in 5-10 seconds.

There are certain formulas that can be used to calculate the performance of an instantaneous water heater. They are usually used by specialists. Ordinary people don't need to know them. Just look at the product passport, where the manufacturer indicates this characteristic. This document usually also indicates the purpose of the device. That is, for what purposes it can be used. For example, only for washing or only for showering, or for several consumers at the same time.

All characteristics are indicated in the product passport Source irkutsk.santech-control.ru

But it should be noted that the performance of a water heater depends entirely on the power it consumes. This refers to the power of the heating element, measured in kilowatts (kW). For example, a power of 8 kW - this water heater is enough to provide hot water to a small cottage. This is for both the shower and the kitchen at the same time. If you require a wider hot water supply network, in which there are several consumers, then it is better to install an instantaneous water heater with a capacity of at least 20 kW.

But here it is necessary to take into account the location of consumers. For example, if the bathroom is located far from the kitchen, then it is better to install two low-power units separately for each plumbing fixture.

As for the power of instantaneous water heaters, today on the market you can purchase single-phase and three-phase devices. The power of the former does not exceed 10 kW. The power of the second is from 5 kW and above. Three-phase models are better in the sense that they create small loads on the electrical network of the house. The higher the power of the device, the more you will have to pay for the electricity consumed.

Attention! Before choosing an instantaneous water heater, you need to make sure that the wiring in the house matches its power. Otherwise, the supply cable may burn out.

Therefore, even before installing the water heater, experts recommend checking the wiring for compliance. It’s better to make a separate section from the distribution board. In this case, a separate circuit breaker and RCD must be installed inside the latter.

Electrical connection diagram Source remont-system.ru

Selecting a flow-through heater

When deciding to install a instantaneous water heater, you should decide on some features.

So, first you need to decide whether the electrical network at home can withstand such a load.

You also need to decide on the purpose of using the instantaneous water heater.

Below is a table, after studying which you can draw certain conclusions for yourself.

In old houses, where the wiring is not designed to withstand heavy loads, it will not be possible to install an instantaneous water heater. Although it is still possible to install a low-power water heater of 3 kW, even before purchasing it is better to check the network by connecting a consumer with the same power to it.

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In modern houses where an electric stove is used, there is no particular need to check the network; if it can withstand the stove, then it will also withstand the heater.

Based on this, the type of water heater is determined. If the network is weak, you should purchase only a non-pressure water heater.

Some owners, if several hot water supply points are needed, purchase several non-pressure heaters, and thereby solve this problem.

Type of heating elements

Another criterion that will help you find the best instantaneous water heater. Today, manufacturers offer two types of heating elements. This is a regular heating element, that is, a tubular element, and a spiral element.

Heating elements of the second type are devices in which the spiral is open and uninsulated. In this case, the element itself vibrates during operation. And these are conditions under which scale does not settle on the heating element, which increases their service life.

It is difficult to say which of the two elements is better. Note that heating elements are cheaper, but their service life is shorter. Spiral ones have a longer service life, but if they fail, sometimes you have to completely replace the water heater itself. However, they are more expensive in price.

The only disadvantage of spiral options is that they are sensitive to air pockets. Therefore, the advice is to install dry-running protection.

Spiral heating element for water heater Source prorab96.ru

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 water tank there is 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).

Classification of instantaneous water heaters

Having figured out how an electric instantaneous water heater works, and also having examined its characteristics, we move on to the classification of the device. In fact, the division is small, there are only two positions:

• non-pressure instantaneous water heaters, they are also open;
• pressure, they are closed.

The two types differ from each other only in that the first requires the presence of high pressure in the water supply network. Therefore, such units are installed where there is a need to connect several consumers. The latter work quietly even at low pressure in the water supply, for example, at standard pressure.

For pressure water heaters, additional pumps are installed, which create increased pressure. If the house has an autonomous water supply, then it is often enough to provide pressure to the installed electric instantaneous water heater.

That is, when choosing from two proposals, it is necessary to take into account the scale of the hot water supply network, plus the possibility of generating pressure in this network.

Nuances and rules of operation

Today, instantaneous water heaters operating from an electric current network are very popular. They entice their consumers with the fact that during their operation there are no restrictions on the volume of hot water supplied. That is, as long as the tap is open, hot water will flow out of it constantly. Of course, with an uninterrupted supply of electricity to the house.

But in order for the device not to upset you for a long time, that is, not to fail, you must strictly follow the requirements and instructions specified by the manufacturer. Here are some of them:

• the shorter the distance from the device to the consumer, the better, in this way conditions are created for reducing heat losses;
• if the water in the water supply network is hard, then it is worth installing a softener filter in front of the water heater;
• The unit cannot be installed in an unheated room;
• if you decide to install a water heater in a shower or bathroom, then try to do everything so that water does not get on it, it is still electric;
• if the water pressure in the water supply has dropped, then set the unit to medium temperature, otherwise it simply will not turn on.

Proper installation is the key to long-term operation Source teremrostov.ru
See also: Catalog of companies that specialize in the installation of engineering systems, ventilation and air conditioning.

All experts and manufacturers agree on one opinion - the first launch is carried out very carefully. What to do for this:

• check whether there is water in the home water supply, what its pressure is, whether it corresponds to the passport indicator;
• temperature adjustment is carried out only with the tap open;
• After the first run, it is better to disconnect the device from the electrical network.

Attention! In many brands and models, the set temperature remains the same after the faucet is closed. That is, when you turn it on again, the settings will be the same and you just need to change them as necessary.

And lastly, when purchasing an instantaneous electric water heater, be sure to check whether the wiring in the house matches its power. If not, then it is better to run a separate loop from the distribution board, as mentioned above.

Advantages and disadvantages

To determine the pros and cons of a instantaneous water heater, it must be compared with a non-flowing one, or rather with a storage one. So, flow-through:

• much smaller in size, hence the ability to install almost anywhere;
• electricity consumption only when the hot water tap is opened;
• heating speed immediately after installation – 20-25 seconds maximum;
• ease of operation;
• unlimited amount of hot water;
• does not require maintenance;
• reasonable price depending on the performance of the device;
• harmful bacteria do not multiply inside the unit, because the water is immediately used when heated;
• water does not lose its qualities.

Unlimited volume of hot water Source static-eu.insales.ru
Now a few words about the negative sides of instantaneous water heaters:

• water is heated mainly to a temperature of +60C, which is not always sufficient;
• the greater the power of the product, the higher the electricity consumption, which will negatively affect receipts in terms of increasing the payment amount;
• The more hot water is consumed, the more expensive it costs.

What conclusion can be drawn, taking into account the advantages and disadvantages of a water heater? If you live in a small house and your family consists of 2-4 people, then a flow-through heater is an ideal option for obtaining hot water. If the house is large and many people live in it, then it is better to install one large storage unit.

Large electric storage water heater Source blog.postel-deluxe.ru

What is an instantaneous electric water heater and the principle of operation of the technology

An instantaneous electric water heater is equipment that heats water as it moves. The main feature of the equipment is its compactness, as well as the ability to heat water as quickly as possible.

A water heater looks like a small box that is connected to a pipe and electricity (gas systems also exist). Inside the box: heating system - heating element, control unit, heat pump, temperature sensor, water regulator. The working mechanism is as follows:

• water enters the water heater;
• Due to the heating element, water is heated to the required temperature
• hot water is supplied to the distribution points.

Depending on the power of the device, water can heat up to 60 degrees. In practice, conventional and inexpensive models allow you to get hot water within 40 degrees, which in principle is the optimal temperature for everyday use.

In order for the water to always have a certain temperature, the equipment has to delay the flow rate. This can be easily fixed by purchasing a more powerful water heater.

In order to avoid mistakes when choosing equipment, the table below shows the approximate ratio of power, volume of hot water dispensed and temperature.

Depending on the inlet water supply, the water supply speed data, as well as the state of the hot water temperature, may change.

It is necessary to understand that the more power the heater has, the more electricity it consumes.

Rating of instantaneous water heaters

In this section, we will consider the TOP instantaneous water heaters operating from the electricity network. And we will consider according to the classification proposed above. The rating of non-pressure models will be offered first, the pressure models second.

The best non-pressure water heaters

The rating of instantaneous non-pressure water heaters is headed by the Zanussi 3-logic 5.5 TS with a power of 5.5 kW. Its positive aspects:

• power adjustment in three positions;
• weight – 1.5 kg, which simplifies the installation process and does not require a solid base;
• built-in protection against idling and heating element overheating.

Minuses:

• You can connect only to one consumer;
• there is no power cord that you will have to purchase;
• the power is high, so the cable from the panel must have a cross-section of at least 4 mm².

Next in the ranking is Electrolux Smartfix 2.0 5.5 TS, with a power of 5.5 kW. It has almost the same pros and cons. I just need to add that the plastic of the case is not very durable. Many consumers complain about this. In this case, the body turns yellow over time. But the device has a good service life - 7 years.

Electrolux Smartfix 2.0 5.5 TS Source static.onlinetrade.ru

The best instantaneous electric water heaters in the budget segment

Electric instantaneous water heaters in this category are characterized by simple equipment. They have few protective functions and are often free-flowing, i.e., another tap must be installed in front of them in the system to shut off the water supply during equipment downtime. The internal parts of the device are not designed to hold pressure, but only to allow flow.

In most cases, they can only connect to one tapping point in the kitchen or bathroom. But the affordable price covers these nuances. Models from the rating in the category of budget instantaneous water heaters will be useful in the country or for temporary use in an apartment.

Thermex Stream 500

Rating: 4.8

A beautiful vertical instantaneous water heater with a total power of 5 kW and three-stage adjustment via 2 toggle switches. The first starts the device at 30% of its power, the second at 60%, and both turned on at 100%. Compact dimensions 160x260x95 mm can be easily placed above the sink in the kitchen or bathroom. Manufacturers produce its body in white or silver, which is convenient for combining with the interior. The kit includes everything you need for use: faucet, hose and shower head. There is a ½ inch pipe at the bottom for connection. But you will need to install a shut-off valve in front of the equipment, since the model is non-pressure.

We added the water heater to the rating due to numerous customer reviews reporting the reliability of the device. For most, it works for 5 years and only needs periodic descaling with citric acid.

Advantages

• will heat water up to 60 degrees at any time of the year;
• step adjustment;
• everything needed for washing included;
• metal pipes for connection.

Flaws

• a power of 5 kW will require laying a separate power line;
• only for one sampling point;
• it warms noticeably only when the power is turned on at 60-100%;
• The housing leaks if you forget to turn off the tap on the water heater.

Timberk WHE 5.5 XTR H1

Rating: 4.7

Another flow model from a trusted manufacturer, but without step adjustment. The water heater operates consuming 5.5 kW, and the temperature can be changed by adding or decreasing the pressure. The case has a stretched hemispherical shape and looks original. On the outside, the model is well protected from water (IP4), and will not suffer from direct splashes. The on state is indicated by a bright blue diode in the central part. The kit already includes an inlet filter. The electrics are equipped with a relay that is triggered by overheating, so it will not burn out during prolonged active operation.

Reviews show that the water heater quickly copes with its task. Our experts agree with this, since in addition to consuming 5500 W, the device is equipped with a spiral heating element, rather than a C-shaped one, which increases the heat transfer area. The equipment productivity is 3.85 liters of hot water per minute, which led to its well-deserved place in the ranking.

Advantages

• compact dimensions;
• stylish look with an unusual shape;
• excellent heating;
• good protection of the case from water.

Flaws

• grounding is required;
• cannot be connected to a regular 16 A socket;
• the shower head will have to be purchased separately;
• Gaskets are of poor quality - need to be covered with sealant.

Zanussi 3-logic 3.5 TS

Rating: 4.6

Flow-through heating device with a horizontal housing. Consumes 3.5 kW, with step-by-step power adjustment via three buttons on the front panel. Designed for one sampling point. It is equipped with everything necessary for use: faucet, hose, shower head, filter in front of the inlet for descaling. Manufacturers have equipped the water heater with a copper heating element, which promotes better heat transfer. Unlike previous budget products, it has a protection function against operation without water in the system - when the tap is opened, the electronics simply will not turn on.

Judging by dozens of reviews, it is clear that users like the water heater for its ease of connection. For installation, you do not have to lay a separate power cable - the plug can be plugged into a regular grounded outlet. We included the product in the rating because of the information content of the panel: indicators on it display the switching on, heating and operation of the temperature limiter, which will tell a person what state the device is in now.

Advantages

• rich equipment;
• can be plugged into a regular outlet;
• several protective systems;
• copper heating element.

Flaws

• only for one point;
• to wash in hot water in winter you need a thin stream;
• short network cable.

Electrolux Smartfix 2.0 3.5 TS

Rating: 4.5

Horizontal flow model with a beautiful design and dimensions 270x135x100 mm. The front panel has four buttons forming a circle. Three of them provide a stepwise increase in power with a maximum of 3.5 kW, and the fourth turns off the power. Inside the circle there are pictures indicating the functionality of each key. The case is reliably protected from moisture. A copper tube is used as a heating element.

The water heater was included in the rating of budget instantaneous models due to ease of installation. Its connector fully matches the thread from the shower channel of a conventional faucet. This will be an excellent alternative for temporary use when the central hot water supply is turned off - just hang the device, plug it into the outlet and screw the shower hose from the stationary mixer in the bathroom to the inlet.

Advantages

• fully equipped with everything necessary;
• direct connection to a regular outlet;
• the watering can has several rotary modes for different pressures;
• original button design.

Flaws

• the thin hose is constantly twisting;
• you need to greatly limit the pressure to get 40 degrees;
• short wire with plug;
• always used at maximum mode.

Polaris Orion 5.5 ST

Rating: 4.4

A simple instantaneous water heater with a clear interface. All control is carried out via a round switch, each clockwise step of which increases power. At the outlet there is a tap and a shower splitter. A copper heating element ensures heating of the flow to 60 degrees at an incoming liquid temperature of +11º. The electrical part is equipped with overheating protection and blocking of switching on without water. The user can set the heating temperature limit. Judging by the reviews, many people like it for its convenience and reliability.

The water heater entered the rating due to its compactness. This is one of the smallest models with dimensions of 225x185x85 mm, with a power of 5.5 kW. It is worth paying attention to those who have very limited space next to the shower or sink.

Advantages

• copes with heating at any time of the year;
• there is everything you need for use;
• simple controls;
• set of protective systems.

Flaws

• the round switch is difficult to turn with wet hands;
• the front panel and rear wall of the case are not sealed - cannot be hung over the bathtub;
• requires cable laying with a cross-section of 4 mm2;
• consumes a lot of electricity.

Video description

The video shows a instantaneous water heater of the Timberk brand:

Second place goes to Electrolux Smartfix 2.0 6.5 TS with a power of 6.5 kW, a capacity of 3.7 l/min, requiring an inlet pressure of up to 6 atm. The big advantage of this device is its operability even with low water pressure in the water supply system. Otherwise, it is not inferior to the first unit. But a significant disadvantage is the lack of a power cable with a plug. It will have to be purchased separately, taking into account a cross-section of at least 4 mm² with a connection to a machine of at least 32 A.

In third place is the original vertical type AEG BS 60E with a power of 6 kW, a capacity of 3 l/min, operating from water pressure up to 10 atm. The advantages include a good interface with convenient buttons for switching modes. There is protection against overheating of the heating element. You can even connect to an outlet for an electric stove.

As for the minuses, to raise the temperature to the maximum, you have to reduce the pressure to the maximum. In this mode, the device will operate for no more than 5 minutes, after which the overheating protection is activated. During operation, the power cable becomes very hot. It is required to install a machine with at least 32 A.

The best instantaneous electric water heaters in the mid-price segment

Instantaneous water heaters in this category are equipped with a large number of functions that improve operation. This includes self-diagnosis, a digital display to display parameters and settings, electronic control and maintenance of the set temperature regardless of the characteristics of the incoming flow.

The internal system of the equipment is more durable and is designed to constantly maintain pressure, so the device can be mounted at the cold water inlet and heated at several sampling points at once. Models from this rating are optimal for permanent use in houses and apartments where there is no gas or instead of a centralized hot water supply.

Electrolux NPX 8 Flow Active

Rating: 4.9

Flow-through model with a nice design. The heating element consumes 8.8 kW, providing heating of the flow to 60 degrees with a throughput of 4.2 liters per minute. Supplied with a plug into a socket. A bright display on a black background informs you about the current temperature of the liquid. There are touch buttons to adjust the values. If breakdowns occur, the electronics diagnoses itself and issues an error code - using the operating instructions, you can decipher it and understand what is faulty.

Reviews praise it for its uniform heating, in which changes are not felt at all. Our experts attribute this to highly sensitive electronics that monitor flow temperature and changes in water flow (determined by system pressure), and automatically adjust the power level to maintain the set value. This is the best choice for a private house on two floors.

Advantages

• touch buttons;
• bright display;
• covers the need for several points during simultaneous use;
• There is a separate flow control.

Flaws

• high price;
• the body is larger than other models, and you need to think about where to install it;
• a separate line and a 32 A circuit breaker at the input are required.

Stiebel Eltron DDH 8

Rating: 4.8

Vertical flow heater with two diodes informing about the inclusion and operation of the heating element. The internal channels can withstand pressure up to 10 atm, which classifies it as a pressure type. But the power control is mechanical, and without an external switch - to adjust it you will need to open the case and reinstall the jumpers. It's safe, but takes a long time. In addition, the device must be placed in an accessible place.

The water heater was included in the rating due to the accelerated heating of the flow thanks to three heating elements. In combination with a power of 8000 W, this ensures sufficient heating even with several simultaneous sampling points. In the category, this product has the most attractive price, which should be taken into account by those who want to get a powerful device and save money.

Advantages

• the housing is reliably protected from splashes;
• productivity 4.1 l/min;
• overheat protection;
• copper heat exchanger with triple system.

Flaws

• cannot be installed in a hidden manner due to mechanical adjustment;
• to change the power you need to open the case and move jumpers between the contacts;
• expensive repairs if the heating element burns out;
• Does not support automatic temperature adjustment.

Timberk WHE 6.5 XTN Z1

Rating: 4.7

Instantaneous water heater available in white or gray casing. Consumes 6.5 kW and is equipped with overheating protection and startup blocking when the system is empty. There is only a power indicator light on the front panel. The casing of the electronic unit prevents the penetration of water from the outside. The design can withstand pressure up to 6 atm and operates several taps simultaneously.

According to our experts, this model was worth including in the rating due to its performance due to the spiral heating element and compactness. The dimensions of the water heater are 188x172x90 mm and it can be easily hidden even in a cabinet under the sink or in a niche behind the toilet. This is the best option for organizing hand washing with warm water in a small office.

Advantages

• no need to press a button - turns on and off when water movement occurs;
• neat assembly and reliable connections;
• metal fittings;
• detailed installation instructions.

Flaws

• need a separate line;
• grounding is required;
• the small distance between the pipes complicates installation;
• no external power regulator.

AEG RMC 75

Rating: 4.7

Product from an American brand with a sealed case. The mechanical regulator is securely hidden in a U-shaped recessed compartment. The protruding blade is convenient for switching even with wet hands. The water heater consumes 7.5 kW with a flow rate of 4 l/min. The manufacturer has equipped it with overheating protection and a temperature limiter. The red diode on the panel will always tell you whether the flow device is currently working or not. Judging by customer reviews, it can be adjusted to a real 55 degrees, but the jet will be very thin. With average throughput it produces 35-38º.

Our experts unanimously included the water heater in the rating of the best due to its protection against water with an IP5 rating. To do this, the manufacturer tested the product by applying a stream of liquid to it with a pressure of 12 l/min for 15 minutes. This design is suitable for installation in a bathhouse or in a homemade shower stall.

Advantages

• automatic switching on from pressure;
• designed for a pressure of 10 atm and three points;
• copper channel for heating the flow.

Flaws

• need a separate line;
• grounding is required;
• the small distance between the pipes complicates installation;
• no external power regulator.

CLAGE CEX 9

Rating: 4.6

A modern flow-through model with a power of 8000 W and electronic control. The equipment is made in Germany and has decent build quality. User reviews like the touch buttons for selecting modes and adjusting heating. The informative display shows the current temperature, operation and heating intensity option (“Normal” or “Eco”). The device is equipped with a self-diagnosis system and three heating elements. To facilitate installation, marks are provided on the casing.

According to our experts, the water heater has earned a place in the rating of instantaneous models due to its quality. Its heating elements are made of stainless steel, which transfers heat well and is resistant to corrosion. To adjust the temperature, a remote control is provided, so hidden installation in a niche is allowed, which will be appreciated by lovers of aesthetics and comfort in the bathroom.

Advantages

• maintaining the set temperature;
• large display for easy entry and control of settings;
• wide range of operating pressure from 0.5 to 10 atm;
• durable materials.

Flaws

• you need a cable with a cross-section of 6 mm2 and a 40 A circuit breaker;
• if placed in front of the collector, there will be a delay of 30 s;
• you need to reduce the standard pressure by half.

Electrolux NPX4 Aquatronic Digital

Rating: 4.5

Compact device 191x141x85 mm with display and electronic adjustment. In reviews, the instantaneous water heater is praised for its convenient buttons with an original narrow shape. The middle one is used to turn it on and off, and the side ones to raise and lower the temperature. Power of 4000 W provides a productivity of 2 l/min. Heating occurs in a spiral heating element, and the entire structure is protected from water.

We added the model to the rating of flow-through electrical devices due to its elegant design, combining modernity and minimalism. This is facilitated by the display, merging with the color of the body, on which only numbers are visible without a screen border. The water heater is suitable for seasonal use in an apartment for several weeks.

Advantages

• electronics monitor safety;
• accurately supports the set mode;
• compact;
• When used only in summer, it can be connected to a regular outlet.

Flaws

• uninformative assembly instructions;
• the jet is thinner than other versions;
• unnecessary parts included in the kit that confuse users (3 gaskets and an aerator);
• fragile flow restrictor housing - breaks if tightened too hard.

Thermex Topflow 6000

Rating: 4.5

The product is equipped with a power of 6 kW and is triggered automatically when the liquid moves in the channel, but it can be turned off or started as needed by using the touch buttons. For operation, a pressure of 1 atm is sufficient. Maximum communications are designed for 10 atm. The display shows the current temperature and heating level. In total, the device has 12 power modes. If necessary, it can be installed in front of the splitter and power all the sampling points in the house from it.

Our experts recommend this water heater for those who value quality items with a long service life. The stainless steel heat exchanger with a spiral configuration can withstand prolonged heating, attracts less scale than copper, and does not rust. Connection pipes are made of brass and are not subject to corrosion.

Advantages

• large display with orange backlight;
• strict maintenance of the established regime regardless of the inlet water parameters;
• touch buttons;
• beautiful design with a circular arrangement of keys around the screen.

Flaws

• a large case 225x365x130 mm is more difficult to place;
• weighs 3 kg and needs to be properly attached to the wall;
• a separate cable to the panel and RCD or grounding is required;
• the stream must be reduced by half from the usual one.

Video description

The video shows an AEG brand instantaneous water heater:

The best pressure water heaters

Let's start with the fact that pressure models require a pressure in the water supply system within the range of 6-10 atm. Therefore, manufacturers recommend installing them in a water distribution unit. Typically, such water heaters are used to supply hot water to several consumers simultaneously. That is, they are used as the main source of hot water in the house.

There are only three models in our rating. And first place goes to Electrolux NPX6 Aquatronic Digital. This is a 6 kW device with a capacity of 2.8 l/min, requiring a pressure of up to 7 atm. What can you say about the advantages:

• modern design;
• electronic adjustment;
• good pressure from the watering can;
• connecting the pipes from the top is very convenient.

As for the disadvantages:

• the manufacturer does not recommend connecting with flexible hoses, which makes installation difficult;
• automation does not always work, especially at low pressure, so you will have to control the modes manually;
• water supply limiters are plastic - short service life.

Electrolux NPX6 Aquatronic Digital Source ya-rostislav.ru

Rating of the best manufacturers of instantaneous water heaters

In order to simplify the selection procedure as much as possible, we present to your attention a rating of the best instantaneous water heaters presented today on the domestic market.

Budget models

Middle price segment

Premium models

Briefly about the main thing

The design of an instantaneous electric water heater is simple. This is a heating element placed in a container through which water flows.

Classification of devices: pressure and non-pressure. The former require water pressure in the plumbing system, the latter can operate from a tank that is installed above the water heater.

Characteristics of the units: productivity, power consumption of electricity, water pressure in the water supply system.

Rating of water heaters, which separately considers pressure and non-pressure models, as well as devices for sinks and showers.

Ratings 0

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