A water heater installed in the kitchen under the sink helps out in case of a power outage hot water. Such a boiler will be no less useful in dacha conditions.

The need to purchase a local device for the kitchen that can heat water becomes relevant in different situations (switching off hot water supply, country conditions). Solving the problem is not difficult, since the consumer market makes it possible to choose a modern, improved water heater or boiler, adapted to specific conditions and mounted directly under the sink.

Types of water heaters

Progenitor of all modern models, helping to have hot water, is gas water heater. Where it is not possible to install it, an alternative is a later and less fire-hazardous electric analogue for the kitchen. If desired, you can select modifications with mechanically control or an improved automatic machine, which is a guarantor of safety, since it is capable of independently shutting off the gas supply if it suddenly goes out or the draft stops. According to the principle of operation, all water heaters are divided into the following types.

Flow-through

The gas flow type in a modern design appears as a compact, aesthetic column connected to the main line. It fits perfectly into the kitchen ambience in the space under the sink, as the range comes in different colors.

The disadvantage that owners of such devices usually consider is that the supply of heated water stops as soon as the gas is turned off. Such water heaters save during the period planned outages hot water supply and are an excellent lifesaver in the country.

Electric flow heater water for the kitchen looks like a small box with a tap coming out of it, from which water flows to the desired degree of heating. Such a device is connected to the water supply system. Running water, passing a heating element, receives heat and is used for domestic needs. This device is convenient for placement in a small kitchen where significant volumes of hot liquid are not required.

Cumulative

This water heater is attractive due to the design of the tank - a thermos, which stores heated water. long time. This variation of the boiler is economical, since the device is turned on to bring the required volume of liquid to the desired temperature, and then turns off. Gas varieties are not as compact as their flow-through counterparts, but have a sufficient range of dimensions and excellent decor to fit under the sink in the confines of the most stylish kitchen.

Most electric storage water heaters are a full-fledged automatic boiler, which independently, following the programmed program, performs all the basic functions: turns on, heats the water to the required temperature, turns off. Such a device must be constantly connected to the network.

Performance

In order for storage water heaters to fully meet expectations, you should determine the average volume of use warm water and install the boiler by selecting a suitable tank from a standardized line:

• 10 liters is an option ideal for a married couple;
• 15 liters – a model that can satisfy the needs of three people;
• 20 liters - a modification of a storage water heater from the category of universal devices, providing comfortable conditions in the kitchen there is a family of almost any composition.

Volumes of 25 liters can be found, but they will disappoint with their low efficiency, so for the kitchen of a living space where a large family lives, instantaneous water heaters are recommended that are not limited by the dimensions of the tanks.

Power

When purchasing a boiler, you need to carefully consider the issue of comparing the power of the device with the capabilities of the existing electrical wiring. In houses with central gas supply, it may not be able to withstand the connection of an additional device, which on average consumes 3.8 kW. For this reason, only a specialist can give recommendations on whether communications will need to be replaced. If the kitchen is electric stove a preliminary consultation will not be superfluous regarding the possibility of simultaneously turning on it and the water heater at full power.

Safety and check valve

For flawless operation, any boiler requires the installation of a check valve in the kitchen water supply system, which is additionally combined with a safety analogue. The function of the last valve is to regulate the increase in water pressure above normal by bleeding water. In this case, there may be a slight leakage of moisture, which is normal. The check valve prevents excess moisture from the water supply from entering the water heater.

Having a large boiler, it is advisable to provide an expansion tank to collect the water that flows out during the increase in pressure. It is placed between the area where safety valve and a water heater.

Installation of a water heater in the kitchen under the sink

All Consumables, necessary to fix a modern water heater directly under the sink, are included as standard. The installation algorithm in a kitchen is not particularly difficult and can be done independently.

A small water heater installed under the sink in the kitchen or bathroom allows you to save space in small spaces. It’s hard to imagine that even in the last century, people living in private houses needed to manually heat water in order to wash dishes and solve basic household problems. Today, the ability to install a water heater under the sink makes life much more comfortable. Such equipment is installed not only in private houses where there is no hot water supply at all, but also in comfortable apartments where there are interruptions in the water supply.

There are several reasons for installing such equipment, and the choice of a suitable model largely depends on them.

1. In case of complete lack of hot water supply. In such rooms, not only a water heater under the sink can be installed small size, but also a large storage boiler for the bath.
2. For use V summer season . Every year, in many cities in the summer, hot water is regularly turned off for diagnostics and repair of water mains. In order not to experience difficulties with constant heating of water for domestic needs, many install this type of equipment in their apartments.
3. In case of sudden emergency shutdown hot water when the house can be construction works or replacing pipes. In this case, it is recommended to use small volume devices. A ten-liter water heater can easily fit both under the sink and on the wall and will not cause any trouble. In addition, it is worth noting that most often they are produced in classic colors, which will not spoil the aesthetic appearance of the space.

Types of water heaters for installation under the sink

In fact, in order to make a choice that you won’t regret in the future, you need to decide for what purpose the water heater will be used. The type of device purchased largely depends on this. Each water heater consists of two pipes and heating element, which turns cold water into hot.

Electrical equipment is more popular because gas-burners In many rooms it is impossible to install due to design features.

Depending on the operating principles, electric water heaters are divided into two types:

• flow-through;
• cumulative.

Flow-through

In a flow-through device, water passes through a powerful heating element and immediately enters the tap. Accordingly, the power of the heating element in such a device is high and amounts to 3 - 27 kW. Not every wiring is capable of withstanding such a load: in old houses the machine switches off even at 5 kW. New and serviceable electrical networks can support a device rated for no more than 12 kW. More powerful equipment requires three-phase connection.

Instantaneous water heater

Cumulative

The accumulative version, unlike the flow-through one, has small capacity for storing water reserves, so they take up more space under the sink and are more expensive. But they outperform flow-through ones in terms of performance, since the water in the storage tank is first heated for some time, and only then supplied to the tap.

In addition, the power of their heating element is lower. For example, in 15-liter capacitive devices from leading manufacturers Thermex and Gorenje, heating elements are installed, the rated power of which ranges from 1.5 to 2.5 kW. Accordingly, such equipment is suitable for connection to a regular power supply.

If a flow-through device heats the entire flow of water at once and, depending on the power of the heating element, can heat up to 30-40 degrees (depending on the time of year) from 1.8 to 4 liters, then the storage boiler will take some time. When water is consumed, cold water enters the tank, where it mixes with the already heated water. If the heating element is not given some time, the outlet water temperature will gradually decrease.

Storage type water heater

How to choose the size of the boiler for the sink

For installation under a sink, both a small-capacity storage water heater, for example the Thermex Hit series for 10 or 15 liters, or a device with a flow-through operating principle are suitable. Of course, if you install the second option, there will be more free space, but not every wiring will withstand its powerful heating element, and the use of such a device will have a greater impact on electricity bills.

As for boilers that can be installed under a sink, they differ in the volume of the water storage tank.

1. Ten liter This option is suitable for a small family of no more than two people. For one person, such a supply of water may even seem excessive, but in this case you can save money on wasting electricity. It is worth noting that if the tank is not turned off after each use, you will see a noticeable difference in the bills. If you plan to install a tank for one person, then how best option, flow-through may be suitable.
2. Fifteen liter This option is perfect for a private house or apartment where there is one middle-aged child in the family. If the baby is still small, then caring for him will require more water, and in this case the tank may not be able to cope with the heavy load.
3. Twenty liter The model today is considered one of the most optimal and in demand. If you use water supplies carefully, you can special labor Even two adults can take a shower, which is extremely important if the family lives in a private house. In this kitchen you can safely do all the necessary things, since there will be enough water at any cost, even the most impressive. According to experts, this volume is enough to wash all the dishes after a large feast for five people.

If the water heater is actively used for large quantity person, and there is no way to install capacitive apparatus, then it is better to install a flow-through option under the sink.

It can heat water in the required volume without restrictions. However, in this case, it is worth understanding that energy consumption can increase several times. It all depends on how effectively it will be used.

Why are safety and check valves needed? A reliable water heater for a sink must be equipped with security team

, which includes a pressure regulator - it protects devices from water hammer. If the network pressure exceeds 4.5 atm, then for devices with a small tank in front of the safety valve it is better to additionally install a pressure reducer. To collect excess water, an expansion tank can be installed between the valve and the main tank. Its formation occurs when water is heated, since it expands under the influence of the heating element.

1. The storage boiler performs several tasks.
2. Prevents water from flowing back into the main line. It guarantees that the tank is completely filled. Otherwise, the heating element, which is not completely immersed in water, will fail during operation.
3. Emergency option for draining water from the tank. For example, for dismantling or repair. Protects the inner tank from rupture. This situation is possible when the thermostat does not work due to a malfunction, and the heating element continues to heat the water until it boils. Under the influence high temperature

and the steam seal of the tank may be broken. It is installed when installing the water heater at the inlet cold water

into the boiler. If it malfunctions, the user will notice that hot water will flow from a cold tap. If such a situation is detected, urgent repair of the protective device should be carried out. Otherwise, the consumer will pay for heating unnecessary water.

Safety valve

Manufacturers of under-sink water heaters When purchasing, it is recommended to pay attention to the country of manufacture. As a rule, the most economical option is Chinese production

, but after a short amount of time the main parts will need to be replaced, which will lead to additional costs. Such manufacturing companies include Polaris, Ballu. However, it is these economical options that are the most in demand today. Models of German, Swiss or domestic production, for example Thermex, Electrolux, AEG, Gorenje, turn out to be more reliable.

In most cases, all materials necessary for installing and connecting such equipment are included in the kit. If necessary, missing elements should be purchased before installation work begins. For example, in many budget models there is no check valve.

The installation process looks like this.

1. The water heater pipes are equipped shut-off valves.
2. A protective check valve is installed on the cold water pipe, a faucet is installed on it, then an adapter is installed on a metal-plastic pipe.
3. Only a faucet and an adapter for a metal-plastic pipe are installed on the hot water pipe. Instead of polypropylene tubes, you can use flexible liner, which is most often included in the kit, but the first option is more reliable. Besides metal-plastic pipes have a larger diameter, which reduces pressure and improves water supply.
4. The flexible mixer hoses are dismantled and tees are installed at the water intake point after the shut-off valves on the water supply. From the cold water supply pipe - for supply to the boiler, hot - for switching when the hot water is turned off.
5. Connecting the tank with appropriate connections. During operation, it is necessary to seal all connections.
6. To prevent puddles on the floor from the safety valve, it is best to install an outlet from the drainage pipe with an outlet into the sewer or any container.
7. Since this is electrical equipment, an outlet must be installed to the water heater. To protect the equipment, the shield should provide local machine.

Exhibit desired temperature water and connect the heating elements of the water heater only when the tank is completely filled.

An under-sink water heater is the best option for small spaces. The type of equipment, capacitive or flow-through, is selected in accordance with the purpose of the device and the number of consumers. Installation is not difficult, but if a person has never dealt with plumbing equipment, it is better to entrust the work to qualified craftsmen.

From interruptions hot water no one is insured, and it doesn’t matter whether we are talking about a comfortable apartment in Moscow or a private house in one of the remote corners of Russia. When you need an additional source of hot water for use during emergencies or planned outages of the central hot water supply, then you should choose something compact and convenient. One of the most practical solutions- under-sink water heaters that do not take up useful space.

Types of water heaters with installation under the sink

Such devices are made with a top supply of communications, which is why it is convenient to install them from below kitchen sink. As a rule, these are models that operate on electricity and do not require complex installation - what is needed as insurance against interruptions in the hot water supply. The market can offer two types of water heating devices with top connections:

• accumulative,
• flow-through.

Storage boilers under the sink

These models are equipped with a small volume tank, usually from five to fifteen liters. There is always a supply of hot water in the tank, which is supplied to the tap when it is opened. Storage boilers are extremely convenient and provide good water pressure.

Among the offers on the market, it is worth highlighting several families from the best manufacturers:

• Aqua Jet: SE1 is an affordable development of the Timberk brand, including models with a volume of 10-30 liters. A 15-liter boiler from this series can be purchased on the website for less than seven thousand rubles.
• Omnium from the Ballu brand are inexpensive units with stainless steel tanks that can hold 10 or 15 liters. The price of a ten-liter model in our virtual store does not exceed five and a half thousand rubles.
• SNU…SLi is a premium line from the German company Stiebel Eltron. These are expensive five- and ten-liter water heaters with plastic tanks. The smallest model will cost almost fifteen thousand, but its cost is more than justified by its excellent quality!

Instantaneous water heaters with top supply

The operating principle of flow-through units is simple: opening the tap turns on the heating of the heating element, which ensures an increase in the temperature of the water flow. For such “real-time” operation, impressive power is required - from 3.0 kW. Moreover, models at the lower power limit also have unimpressive productivity - only 2-4 liters per minute. If you need more pressure, then the power needs to be selected accordingly, and not every household electrical wiring can withstand this.

A water heater installed under a kitchen or bathroom sink helps save space in small apartments and does not violate the aesthetics of the room. Let's look at the types of boilers that you can install with your own hands, let's look at the fittings and installation steps to avoid common mistakes.

A water heater installed under the sink can serve as a permanent or backup source of hot water in the kitchen - there is always a place there, and it does not interfere with anything. Which boiler to choose and how to install it correctly?

Types of water heaters for installation under the sink

Since the space under the sink is still limited, you can install there either a storage small-capacity water heater with a volume of 10-25 liters or a flow-through one. Heating in them is carried out by open-type electric heaters or heating elements. Gas boilers, as a rule, of greater productivity and are manufactured only for standard wall mounting.

Heaters for installation under the sink differ in the location of the pipe supply - top. When purchasing a heater, you must pay attention to this, otherwise the device for installation above the sink, installed under the sink, will work poorly and not for long.

So which water heater is better - storage (capacitive) or flow-through (pressure)

Storage heaters take up more space and are more expensive, but their power consumption is lower than instantaneous heaters (up to 3 kW), and they can provide a larger volume of hot water per minute.

Storage water heater

Since the instantaneous water heater has a relatively high power for domestic consumption - up to 8 kW, you need to make sure that electrical network in an apartment or house is able to provide it without constantly “knocking out” the machines. If the heater is intended only for the period of pressure testing by the heating network, when hot water is turned off for 2 weeks in the summer, then heating 2 l/min will require a power of no more than 3.6 kW. Cold “winter” water cannot be heated in such a volume even to 30 °C. For year-round consumption, either a capacitive water heater or a high-power instantaneous water heater is more suitable.

When initially turned on, the storage device will take some time to heat the water; flow-through ones can immediately heat from 1.8 to 4 liters per minute. They heat the entire flow of water at once, while the storage ones heat the incoming cold water, which mixes in the tank with hot water when it is consumed, and after some time the temperature of the water in the tap begins to decrease.

Instantaneous water heater

That is, both types of water heaters have both advantages and disadvantages, and the choice in favor of one of them is only a matter of consumer preference.

But for country house, in the absence of a main water supply, a gravity water heater is indispensable, which is equipped with a special small-diameter mixer to obtain a stronger jet. To create pressure, it is equipped with a hydraulic pressure switch. If the dacha is not used in winter, it can even be removed and installed again in the spring - its installation is so simple.

Pipe fittings for installing a water heater

Let's dwell a little on the pipe fittings that will be required when piping the boiler.

Security group

To protect the water heater from hydraulic network overloads, manufacturers recommend installing special fittings - a safety group that has a pressure limiter. If the pressure in the network exceeds 4.5 atm, a pressure reducer or pressure reducing valve must be installed in front of the safety group.

Safety group for water heater

For small capacitive water heaters, this element is desirable, but not required.

Non-return safety valve

The safety check valve is designed to ensure that the tank is completely filled with water, otherwise the heaters may become exposed and burn out. Draining water from the tank is possible when the pressure in the line begins to drop, and the valve will hold the water in the tank. The second function of this valve is to drain water from the tank, for example, to repair it. The third function is protection against tank rupture. Sometimes thermostats fail, the water continues to heat up, and the pressure in the tank increases. If water is not withdrawn during this period, the tank may depressurize under the influence of boiling water and steam. Fortunately, this rarely happens, but it is better to take safety measures, especially since the price of this valve is not comparable to the possible consequences of an accident.

Safety valve

If the valve is not installed or has become unusable, you will immediately know about it - hot water will flow from a cold tap. There will also be hot water in the toilet cistern, and you will pay for the electricity consumed for this heating. It is installed at the cold water inlet of a tank-type water heater.

Advice! The arrow on the body shows the direction of water flow. When installing a boiler under a sink, the direction of cold water flow is downward, which means that the drainage outlet will be directed upward. To prevent water from dripping onto the floor, install a drip funnel underneath it with drainage into the sewer or put a tube of a suitable diameter on the nipple and lower it into a container.

Other valves are designed to shut off cold and hot water at each branch of the water supply system.

Attention! The water heater installed under the sink is hidden from view, and the leak may not be immediately noticed. Therefore, all water connections must be properly sealed, sealed, for example, with linen tape, FUM tape, or special paste.

Installing a water heater under a sink

Installation different types heaters are slightly different. Let's look at the connection diagrams and installation procedures for various water heating structures.

Installation of a non-pressure water heater

The easiest way to install non-pressure boilers. They cannot be connected to a regular mixer or connected directly to the main pipeline, since the device is not designed for network pressure - it can break.

A special mixer for such a boiler has two valves - one regulates the temperature (by mixing with cold), the other regulates the flow. In this system, the mixer performs the function of a safety group: it shuts off cold water at the inlet to the heater and discharges excess water resulting from its expansion as a result of heating.

Mixer for non-pressure storage heater

Typically, when purchasing such a heater, the kit includes tubes and shut-off valves that are installed at the inlet and outlet of the tank. In this case, the non-return safety valve can not be installed (due to the absence of the risk of a pressure surge) or simply replaced check valve. A floor heater is simply installed on the floor, while a wall heater needs to be secured to the included brackets or other fasteners. Then the tubes are connected according to the diagram.

A non-pressure instantaneous water heater is installed according to the same principle. We connect the heater to the power supply only after filling the water heater with water.

Installation of pressure storage water heater

Make sure in advance that there is an outlet with a grounding circuit near the heater. If the heater is wall-mounted, mark the mounting points on the wall, drill holes for fasteners, secure the bracket and hang the heater. The floor heater does not need to be attached to the wall.

We begin preparing the water heater. To do this we do the following:

1. We install a non-return safety valve on the cold water supply (blue mark on the tank fitting). The direction of water on the valve is indicated by an arrow.
2. We screw shut-off valves onto both tank fittings. For cold water, the shut-off valve is installed directly on the valve.

Attention! There is no need to over-tighten the thread during installation, it can be torn off!

1. We connect flexible hoses to the valves (may be included) or through adapters metal-plastic (polypropylene) tubes with a diameter of 16-20 mm for connection to the water supply. The latter method is preferable, since it is more reliable and, in addition, the larger diameter of the pipes provides less hydraulic resistance and best serve water.

• on cold water - for supply to the water heater;
• on hot water to switch from the main hot water supply to the backup one.

We connect the hoses (tubes) coming from the tank with the corresponding hot and cold water pipes. Check that the cold is connected to the cold, and the hot to the hot.

1 - hot water supply; 2 - safety valve; 3 - eyeliner; 4 - cold water supply

Connect a dropper or siphon to the drain pipe of the safety valve to drain into the sewer or a thin tube to drain into a separate container.

Before turning on the water heater, turn off the hot water tap on the main line. Connect electricity only after filling the tank with water.

Installation of a pressure flow heater

Installation instantaneous water heater similar to the installation of a storage heater. The difference is the absence of a non-return safety valve due to the absence of a tank. For some models, it is recommended to install a coarse or filter on the cold water supply. fine cleaning and even a water softener. The device is attached to the wall, pipes with shut-off valves are inserted into the hot and cold water supply mains after the network valves and connected to the electrical network.

1 - hot water supply; 2 - shut-off valve; 3 - filter rough cleaning; 4 - eyeliner; 5 — cold water supply; 6 - RCD

Most instantaneous heaters, especially high-power ones, are not equipped with an electric plug. It is assumed that the equipment connection should go through a dedicated line directly to a separate circuit breaker in the electrical panel. The line must be grounded, with a protection device against short circuit. The cable cross-section is selected depending on the power of the instantaneous boiler.

In this article we will talk about what criteria are used to select water heater for a summer house with a sink. We will also look at what types of water heaters are on the market, and what from this range is advisable to purchase.

General information
The topic of the article is relevant, since most suburban construction sites are not connected to a centralized supply of hot water. Again, systems autonomous heating often suggest the possibility of heating water for the kitchen sink and bathroom sink.
Meanwhile, warm water in the tap is an essential condition for living comfort. The problem of lack of warm water is not difficult to solve; it is enough to install a water heater under the sink with a capacity of 10 liters. There is a wide range of such equipment on the market; it remains to decide what to choose.

Main varieties
In accordance with the principle of operation, all water heaters can be divided into two main types, namely:
Devices with storage capacity- This is the most popular type of equipment, which is characterized by economical energy consumption and ease of operation. Storage boilers with compact dimensions operate on electricity, which guarantees additional convenience during their installation.
Devices with a flow-type heater are less common due to their higher energy consumption. In addition, the price of such units is an order of magnitude higher than the cost of analogues with storage capacity.
Such units, depending on the type of fuel consumed, can be of two types: electric and gas (boilers).
Gas water heaters can only be used in those houses that are connected to the gas distribution main. When deciding to purchase an electric heater, you need to make sure that the condition of the home wiring allows you to operate equipment with a power consumption of more than 2 kW/hour.
Important: A compact instantaneous heater may not cope with its task if the water pressure is excessively high.

Design features of boilers
10-liter storage water heaters under the sink are a closed structure consisting of the following elements:
The outer casing (housing) is usually made of thin sheet steel with enamel coating. Less commonly, the body is made of polished aluminum.
The design of the housing has little effect on operational features heater. The choice of configuration mainly depends on the convenience of placing the equipment in a limited space and on aesthetic preferences.
Thermal insulation layer, which is often used as hard polyurethane foam, less often foam rubber. The type of thermal insulation layer used determines how long the heated water will maintain the set temperature.
Storage container is a sealed metal tank. Domestic manufacturers produce storage tanks made of stainless steel, while in Western European countries preference is given to the production of steel tanks with enamel, ceramic or glass coating.
The inlet pipe, intended for supplying cold water, is made of brass and is a tube with an external thread.
The outlet pipe for using warm water is not much different from the inlet pipe. For ease of use, this structural element is equipped with shut-off valves, which allow you to shut off the water supply from the tank;
The heating element is responsible for heating the water to the required temperature. Heating elements can be either dry or wet.
A wet heater comes into contact with water and therefore a layer of scale is deposited on it. A dry heating element does not come into direct contact with water, since it is enclosed in a metal tube with an enamel coating. Therefore, scale is not deposited on the heating element, and it lasts twice as long as a conventional heater.
The magnesium (“sacrificial”) anode is a metal rod that rusts instead of a heating element or tank. On average, the anode lasts for 5 years up to complete destruction. After this, the anode must be replaced.
The temperature sensor is located in the tank in a special sealed tube. The main task of this device is to turn off the heater after the water temperature reaches a certain limit.
Despite the apparent complexity of the boiler design, operation is extremely simple and completely safe.

Flow-through heater design
Choosing a flow-through boiler for installation under the sink is more preferable than purchasing a storage unit with a massive 30-liter tank. Despite the lack of storage capacity, the design of a flow-through boiler is characterized by greater complexity.
The layout of most units of this type on the market includes the following elements:
Protective housing - can be made of metal or resistant to elevated temperature plastic. The case is compact and equipped with everything necessary for installation in limited space.
A heating element is an electric heating element, which, depending on the modification of the device, can be one or several. The parameters of the heating element largely determine the performance of the device and energy consumption.
A flow sensor is a device that turns on the heating element if the water supply is supplied with sufficient pressure. Thus, if the pressure is weak, the circuit will not work and the heating element will not burn out.
The power supply relay works in conjunction with a flow sensor. It is with the help of these relays that the power of the heating element is turned on.
The temperature sensor is designed to monitor the temperature of the heating element and prevent it from overheating.
Important: Flow-through and storage-type boilers must be grounded; this is necessary for the effective removal of static electricity.

Features of installation work
After we have considered design features water heaters, let’s decide on the instructions for installing them under the sink.
Most often, a compact heater is mounted under the kitchen sink, since warm water is always needed for washing dishes.
Flow-type heaters are less complicated to install compared to storage analogues. Due to the absence of a tank and low weight, the instantaneous boiler can be mounted with your own hands on one of the walls of the washing cabinet.
The device body, as a rule, has special grooves for brackets, which in turn are fastened with screws. There are two pipes on the body of the device. A water supply hose is attached to the incoming pipe, and a hose going to the mixer is attached to the outlet pipe.
Let us note once again that the water heater can only be connected to a grounded outlet. If the wiring in the house is not grounded, you need to take care of installing the circuit yourself.
Installation storage boiler for 15 liters is not much different from the instructions given, except that the installation is carried out on the wall of a washing cabinet, but on an ordinary wall that will withstand the load of a storage tank filled with water.