Choosing a flow-through water heater on the faucet

Master tips for choosing an electric flow-through water heater

How to organize the hot water supply in the house, not connected to the gas mains? How to get hot water at the cottage? How to survive the summer off the hot water? Flow-through electric water heater will be the easiest and most effective solution to any of the above problems. It heats the water to the specified temperature, allowing you to wash the dishes, take a shower or wash laundry. How to choose a flow-through water heater and what to look for when buying it?

Flow-through water heaters have a very simple design. inside them powerful heating elements are installed, providing water heating to a predetermined or a certain temperature. The power of heating elements varies widely, this indicator depends on the performance of the equipment. Flow-through heaters work in the following way. when the water flow turns on the heating elements, they are heated. As soon as the water flow stops, the system turns off.

The flow-through models differ from storage models of their miniaturization. they can be installed in any room, even in the smallest. The heaters are mounted on the wall, they are supplied with cold water pipes. Hot water is drawn in through another pipe. it then enters the taps and showerheads. Depending on the power of the heating elements, the devices can serve one or more points of use.

Water heater with shower faucet and shower head. a universal option for quick installation.

Certain types of water heaters come with faucets and shower heads. These are kits for quick installation. bought, hung up, connected with a flexible hose and start using. There are also flow-through electric water heaters, connected through a shower head. this is a great solution for the period of summer disconnection of the centralized hot water supply.

For use in the cottage or in the kitchen, you can buy a small-sized flow-through water heater on the faucet. It is connected instead of the regular faucet and allows you to get a sufficient amount of hot water. These devices are in demand among those who need hot water solely for washing dishes or washing (they are not suitable for showering).

Tankless Water Heater. Annual Maintenance Routine

What are the features of flow heaters?

  • No tank for storing prepared hot water.
  • Smaller size.
  • Wall-mounted (or on tap).
  • Availability of smooth or step temperature control.
  • Saving electricity in the absence of hot water.

Some readers may object. why flow-through heaters are considered cost-effective, because the power of their heaters is many times higher than the power of the heaters in storage heaters? The answer is simple. storage water heaters are forced to consume electricity to maintain the temperature of water in the tank. Electric flow-through water heaters do not consume any electricity when there is no water flow. It turns out that the flow-through models are advantageous in case of infrequent use.

If hot water is needed every day and in great quantities, we recommend to choose the storage model. If you need water only occasionally (e.g. once a week), we recommend buying a flow-through electric water heater.

Zanussi 3-logic 5.5 TS

Compact non-pressurized water heater with dimensions 270h135h100 mm can easily fit on the wall next to the sink. Copper heating element transfers heat quickly and does not corrode.

  • Has built-in protection against overheating of the heating element and switching on with an empty system.
  • Power has three stages of heating, set by buttons on the body. convenient for different seasons and temperature simulation.
  • Can be easily removed and transported to a new location.
  • For temporary placement, you can not spoil the tiles on the wall, but attach to a wooden base.
  • Weight 1.5 kg makes installation easy.
  • Comes with everything you need for mounting.
  • Sold without a power cord, so you can not use immediately. need to buy a wire and disassemble the case to connect.
  • Because of the powerful heating element, you need a wire with a cross section of at least 4 mm 2 to connect to the mains.
  • Only for one point. when using the shower head and faucet at the same time, the jet is cool even in summer.

Outlet. This flow-through water heater is well suited for a summer house, which comes to rest for a couple of days. It can be used to provide warm water for brushing teeth, washing your face and even bathing in summer. 5 TS 5.5. kW provides heating to a temperature of 50 degrees with incoming water of 15 degrees.

Electrolux Smartfix 2.0 5.5 TS

Wall-mounted flow heater with ½” bottom piping. Ergonomic and clear control panel with three-step regulation and light on indicator.

  • Water can be connected via a shower hose. fits over the thread and allows free choice of mounting location.
  • Spare rubber gaskets for the connections are included.
  • Long life (up to 7 years for some users).
  • Easy installation.
  • Switch-on protection when the system is empty.
  • Copper heating element.
  • Cute look.
  • Supplied without wire.
  • Even with connection of a 4 mm2 cable, the plug is warm after five minutes of operation. Not suitable for homes with weak electrical wiring.
  • If the input is a circuit breaker for 16 A, it can periodically knock out. you need to change to a more powerful.
  • Not a very good quality plastic housing.
  • The flask has time to sufficiently heat water only on the 3-mode (maximum).
  • Most users note that it is better to connect directly to the switchboard, rather than in the socket, which complicates the connection.

Conclusion. The model is well suited for a small workshop or garage, so you can wash your hands and face in warm water in the winter. The water heater will be able to function even at a pressure of 0.70 atm, which allows the organization without supply from the water pipeline, but only from a tank, gravity.

Best non-pressurized water heaters for the shower

To wash in the shower under a stream of hot water, you need sufficient pressure and heating. Flow-through water heaters with a heating element power above 5.5 kW at maximum output.

Timberk WHEL-7 OSC Electrolux Smartfix 2.0 6.5 TS AEG BS 60E
Power consumption, kW 6,5 6,5 6
Flow Rate, l/min 4,5 3,7 3
Dimensions (WxHxD), mm 272х159х112 270х135х100 222x360x105
Weight, kg 1,2 1,3 2,4
Inlet pressure, atm up to 6 up to 6 up to 10

Timberk WHEL-7 OSC

Stylish flow-through water heater with a rich complete set. It has a shower head, a watering can, rubber bands for connection of the fitting and fasteners to the wall. Temperature setting is performed by one rotary switch.

Working principle of water heaters

Modern electric tap water flow heater is a device that replaces rather than complements the faucet. Therefore, its definition is considered somewhat erroneous. The device is quickly installed into a kitchen sink (or simply into the sink), and then connected to the electricity grid and water supply. Electrical connection is made by means of an ordinary wire with a plug, and for the most powerful models you need a separate line for the trimmer with connection without a socket.

Since such water heaters are designed for homes not connected to a centralized source of hot water, nothing prevents us from building such a heater instead of the faucet.

The flow-through water heater with a display for more convenient adjustment of the hot water temperature.

Flow-through water heaters work very easily. after opening the faucet with water the heating element is turned on, and in a few seconds more hot water begins to flow from the faucet. The temperature of heating for most models is 40-60 degrees. If necessary, you can adjust the temperature to your liking. As soon as the faucet is closed, the hot water flow will stop and the heating element inside will be turned off.

Flow-through faucet water heater can also work without heating. to do this, you need to turn the knob to the other side. And in order that you can provide fine-tuning of the heating temperature, we recommend you choose a model with separate controls. here one handle controls the head, and the second regulates the temperature. As a result, you can get hot water with the temperature you need.

Advanced heaters with liquid crystal displays and touch-screen controls offer the greatest convenience. But you have to pay for this convenience. the cost of such heaters is somewhat higher. If you want to save money, buy the simplest model, because the temperature can also be adjusted with the handle.

Principle of operation, types and design features

A compact device, which in the basis of its design contains a heating element, powered from the mains (it and heats flowing water), is called a flow-through electric water heater.

Water, “washing” the heating element, acquires the desired temperature, and is immediately ready for use.

“Flow heaters” differ in design elements:

  • the heating element can be a heating element in a copper casing (or have a tubular form. be a spiral in the casing);
  • can have a nickel-chromium heating coil.

According to the method of control, water heaters can be electronic or controlled by hydraulics. The water pressure in the pipeline in each city and even in a separate house is different.

With this in mind, manufacturers produce devices with different design features. That is, if the pressure of incoming cold water is strong, then the low-power water heater will not be able to produce well heated water at the output.

And at an extremely low water pressure (0.25 atm), they can be nickel-chrome plated and nickel-plated.), the device simply will not turn on.

In this regard, flow-through water heaters are divided into:

Pressure water heaters: principle of operation

Pressure tap water heaters are much more powerful (3-20 kW), so connecting them to two or three faucets is quite common.

However, in order to provide your home with hot water, which at a temperature and head will be akin to the central water supply, you need a device with a capacity of at least 10 kW.

choosing, flow-through, water, heater, faucet

It will cost more, but the comfort is worth it. Divide pressure water heaters into single-phase and three-phase.

Deciding to install a running water heater, make sure it can withstand the wiring in your home (in standard older apartments, this limit is 3 kW).

The flow-through water heater with a capacity of 3 kW is able to “output” about 3 liters of hot water per minute. This is enough to fill a bathtub with hot water.

But this power is not enough to take a full shower. Such devices can be installed in homes where a three-phase power grid operates and are used for older homes, where there are 16-amp plugs.

Electrical wiring will only withstand a water heater up to 3 kW. In apartments where electric stoves are installed, or stand 32-40 amp meters, the maximum consumption of the water heater should not exceed 6 kW.

For such cases, manufacturers offer so-called small flow-through heaters for the faucet, with a capacity of 1.5-8 kW, and that work from the network. They can also be pressurized and unpressurized.

There is another interesting feature of flow-through water heaters, which is rarely told in the store when buying a device.

In summer and winter from the same water heater (this applies to low-power models) at the output, you get a different temperature. Of course, the device is equipped with a special sensor, and itself must “bring” the water to the desired temperature. But in the summer and winter, the device will do the same action, but with a different temperature of incoming water.

For example, in summer the “incoming” water temperature to the heater is 15 ° C, a low-power system device will increase these 15 degrees by 25 more, and the output will be the necessary 40 ° C. But in winter, the temperature of incoming water can be about 5 degrees, and the power allows you to heat it to only 25 degrees. As a result, 30 ° C is still cold water, which is even difficult to wash dishes with.

Why produce such low-power devices? First, this is the customer demand. they are cheaper and during their use there are no problems with electrical wiring.

Secondly, a large proportion of manufacturers. firms from Asian countries, taking into account the climatic conditions of their native region.

In the end it is worth thinking in advance what you need a device for. If a “summer shower”, it’s enough low-power device, but if, as a full replacement for the central water supply of hot water, buy a more powerful water heater.

Non-pressure models and their features

Non-pressurized flow-through water heaters. a device with a capacity of 2-8 kW, will provide a hot water supply for the kitchen, but will be too small for the bathroom.

At the same time, have a significant advantage. the electrical wiring of most apartments and houses can withstand their work without damage.

How to choose and what to look for?

There are several important criteria for selecting an electric flow heater. The most important of these are listed below.

Performance and capacity

Power. the most important parameter, which will determine the possibility of obtaining a certain amount of heated water for a certain unit of time.

If the residents need to take a shower or quickly prepare food, a low-power device that heats three to five liters of water in one minute will be enough. The water will start to warm up in about 20 seconds.

If the family is large and has significant needs, you should give preference to models of heaters with higher capacity.

The purpose of the water heater is usually specified in the instructions to the device. Devices, the power of which does not exceed 8 kW is convenient to use at the cottage, where constant heating is not needed.

A water temperature of 50 degrees is just enough to take a shower or wash a few dishes.

If there is a need to constantly have a large amount of heated water, the device must be more powerful. from 20 kW and above. In addition, you should consider the number of water points in the house or apartment.

If the bathroom and the kitchen sink are located next to each other, one medium heater will be enough.

If such areas are located far from each other, you will need to buy a pair of water heaters of low power, or one powerful pressure heater.

Operation and control modes

The design of the flow-through water heater is quite simple, but such devices also have their own classification:

The hydraulic type of control is also called mechanical. It is equipped with most inexpensive models. Most often there is a step switch, and the most budgetary water heaters may not have the ability to adjust the water flow or temperature mode.

The principle of hydraulic control consists in the fact that during the operation of the device, using levers or buttons, you can set in motion the rod.

choosing, flow-through, water, heater, faucet

This part of the design will change the force of the water pressure, which will change its temperature. The main disadvantage is that the degree of temperature adjustment in models with a mechanical type of control is not very accurate. At a low water pressure the heater may not turn on at all.

The electronic control system allows to control the water pressure and degree of its heating more accurately. Such water heaters are equipped with built-in sensors and microprocessors, responsive to changes in pressure and temperature drops in the main.

This allows you to change the current parameters to those that will fully comply with the mode that the user chooses.

If the water heater will serve only one zone of the water supply, such as a sink or shower, you can buy a more budget-friendly mechanical model, which can be adjusted at any time.

If you are planning that the purchased water heater will serve several points simultaneously, you should prefer a device with an electronic control unit.

The presence and number of adjustments

When choosing a model of flow-through water heater is worth looking at the control system of the device, which can be hydraulic or electronic.

Advanced products have adjustment panels on the front of the body. To save electricity manufacturers produce “flow-through”, capable of operating in two or more modes with different power levels.

All water heaters, without exception, are equipped with a start and stop button. Convenient, if the model provides the ability to regulate the temperature of water heating. Usually the temperature range is from 30 to 70 degrees Celsius. It also contributes to economical consumption of electricity.

Pressureless model with hydraulic control, equipped with a power indicator and a function of accelerated heating of flowing water

Water heater installation and mounting

According to the recommendations of manufacturers, the best way to install electrical equipment is to use the services of professionals. However, the design and mechanism of the electric water heater is not very complicated, and in all devices there is a scheme of installation, so you can make your own installation. It is worth knowing that the installation of the equipment with their own hands and subsequent failure leads to the loss of rights to warranty service.


Delinamo [gallery2 link=”file” size=”full” ids=”15238,15239,15240″]

Operating voltage and frequency of electricity

Highly in demand devices are used, production of the Italian-Ukrainian company Delinamo, this electric heater household flow-through faucet can be bought for apartments and summer cottages. Over the development of the device worked experts from Germany and Italy, production site is located in China. Increase or decrease water heating can be used with a knob, the status of the device has an indicator. Particular attention was paid by the manufacturer to economical consumption of electricity. Rating by users. 4 points.

Important! If in your flow heater water pressure has decreased, compared to what it was originally, it means that in the device clogged filter. You can clean the module yourself, the operation does not require professional qualifications.

Stiebel Eltron DHC 6

This electric instantaneous water heater reflects the high German quality. Heating elements are made of copper, which are reliably protected against limescale and corrosion.

Supplies several points in the house at once.

e.g. kitchen, bathroom, separate bathroom.

It is a great option for connoisseurs of high-quality and comfortable devices.

  • capacity. 3 l/min;
  • Power. 6 kW (220 or 380 V);
  • connection to several pressure points;
  • Inlet pressure. 0, 6-10 atm;
  • control type. mechanical;
  • The presence of a power and heating indicator, 4 degrees of protection against overheating of water;
  • heating elements power. 6 kW;
  • installation type. vertical with bottom feed, wall-mounted;
  • Dimensions. 200x360x104 mm;
  • weight. 2, 5 kg;
  • 3 years warranty;
  • .
  • long service life, which reaches 10 years;
  • high performance and power;
  • easy assembly and disassembly, easy operation;
  • self-explanatory design without the presence of additional elements;
  • the ability to use hot water in several rooms at the same time.

Electrolux NPX 8 Flow Active

This model accommodates many modern features. One of them. programming individual heating temperature.

Intelligent control system allows you to set the necessary modes for comfort.

Thus the excellent parity of the price and quality is noted.

  • capacity. 4, 2 liters / min;
  • Power. 8, 8 kW (220 V);
  • max. heating temperature. 60 ° C;
  • inlet pressure up to 7 atm;
  • Electronic control, water flow and switching indicator, thermometer, display, self-diagnosis system, heating temperature limitation
  • availability of protection against switching on without water, against overheating with 4 degrees;
  • equipped with a water filter, connection to the mains socket;
  • the power of heating elements. 8, 8 kW;
  • dimensions. 226x370x88 mm;
  • weight. 2, 5 kg;
  • .
  • Extended functions that affect the comfortable use of the water heater;
  • reasonable price;
  • High quality housing, which is protected from moisture and rust;
  • heating elements have a long service life, do not require constant replacement;
  • reliable fixation on the wall, without damaging the wall finishing;
  • easy to install, easy to use.

Stiebel Eltron DHC 8

The electric flow heater satisfies the consumer with top German quality. Heating elements are reliably protected against limescale and corrosion.

The device is able to serve for more than 10 years, without requiring the replacement of components and technical inspections.

Suitable for connection to several points.

  • capacity. 4, 1 l/min;
  • Power. 8 kW (220 V);
  • The number of water points. a few pressure points;
  • inlet pressure. 0, 6-10 atm;
  • Type of control. mechanical;
  • The presence of the indicator on and heating, 4 degrees of protection against overheating;
  • material of heating elements. copper;
  • installation. vertical installation with bottom supply, wall-mounted;
  • dimensions. 200x360x104 mm;
  • weight. 2, 4 kg;
  • 3 years warranty;
  • .
  • Possibility of open and concealed installation;
  • availability of detailed assembly instructions;
  • Durability. service life. more than 10 years;
  • effective protection against splashing and electric shock;
  • understandable control, eliminating the possibility of unprofessional setting of the equipment.

Water Heater Will Not Drain? Fix It With These 3 Easy Steps

Electrolux NPX 8 Flow Active 2.0

High-performance water heater with many advanced functions. Connects to multiple water outlets at the same time without changing the quality of water supply.

Electronic control facilitates the algorithm for creating a constant, comfortable settings.

  • performance. 4, 2 l / min;
  • capacity. 8, 8 kW (220 V);
  • max. heating temperature. 60 ° C;
  • Inlet pressure. up to 7 atm;
  • presence of ON indicator, thermometer, display, self-diagnostics, heating temperature limiter, overheat protection, water filters
  • Power heating elements. 8, 8 kW;
  • mounting type. wall, vertical with bottom feed;
  • dimensions. 226х370х88 mm;
  • weight. 2, 5 kg;
  • warranty. 2 years;
  • .
  • Attractiveness, compactness and lightness;
  • easy operation;
  • Durability of each element;
  • fast water heating;
  • high degree of protection against adverse influences.


Modern model of electric instantaneous water heater. Connects to multiple water outlets, equipped with an indicator of power and heating, thermometer, display, protection against overheating and self-diagnosis, remote control.

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