Double-circuit electric boiler: selection rules for the home. Electric double-circuit heating boilers - a great alternative to gas boilers

Electricity has long been used as a source of energy, on which modern heating devices operate to heat both residential and utility rooms. Although the cost of the energy carrier does not always justify the use of an electric boiler as the main source of heat. But what if the homeowner does not have the opportunity to connect to the central gas main? Correct use Alternative option– electric double-circuit boiler.

Advantages and disadvantages of electric heating

Ease of installation and use, compact dimensions and aesthetic appeal and, most importantly, the price and safety of a dual circuit wall boiler they simply attract the consumer with a magnet, even despite the consumption of a large amount of electricity by the unit. Although, in order to save money, many heating devices are equipped with step-by-step power control.

Considering that in many major cities nightly electricity tariffs are in effect, the economical homeowner will set the boiler to a more intensive heating program for this period. A properly configured electric boiler can not only create comfort in an apartment, but also will heat the water by the time the tenants in the house wake up. At the same time, thanks to the night tariff, it will be possible to save on hot water supply.

Plus, temperature controllers installed on each radiator in the apartment will help reduce energy costs for heating. Thanks to this simple addition to the electric heating system it is possible to set the temperature in every single room in the house. In addition, wall-mounted models of double-circuit electric boilers have a number of the following advantages:

• ease of operation;
• maximum efficiency;
• quiet operation of the device without vibration;
• maximum automated processes heating;
• installation of a suitable temperature regime in room;
• lack of a chimney or a separate boiler room;
• ease of care;
• high fire safety;
• lack of exhaust gases;
• ease of installation;
• relatively low price.

Use of electrical double-circuit boiler, possibly both as an independent unit and in combination with a gas and solid fuel device or a solar system. In this embodiment, the electrical unit can be both the main source of heat and a backup device.

But, even considering the many advantages electrical system heating, its use in large rooms is impractical due to the high cost of electricity. In multi-storey buildings, it is better to use a multi-fuel heating device.

However, these are not all the disadvantages of electric double-circuit boilers. Frequent power outages and unexpected voltage drops reduce the efficiency of such a heating system. Especially this problem noticeable in the suburban area, when in the event of a breakdown of the electrical main, entire areas are left without electricity for a long time, especially if there is bad weather outside the window and the emergency service cannot drive off-road. Although problem can be solved by gasoline generator , but this is not economically advantageous, since the price of gasoline is very high.

Another nuisance that accompanies electric heating boilers is the old electrical wiring in the house, which does not withstand increased loads. And, as you know, overheating of the wires can lead to a fire.

Design features of the electric boiler

The double-circuit type electric boiler has enough simple design, although it replaces the mini-boiler room. Each circuit of the device can function both separately and in pairs, heating the room and heating water at the same time. In this case, such equipment consists of the following elements:

• a heat exchanger through which the coolant flows when heated;
• storage tank for hot water;
• heating elements for heating the coolant and water;
• expansion tank for high pressure relief;
• electric pump to circulate the coolant;
• air vent to remove air pockets;
• safety valve, ensuring the safety of the device;
• an automation unit responsible for maintaining the specified modes;
• control system that allows you to set temperature parameters.

According to external data and design electric boilers divided into the following models:

• wall-mounted electric boiler with compact dimensions;
• underfloor heating device for heating large rooms.

Based on the name, the first device is mounted on the wall. In turn, the floor electric boiler is installed on the floor in a place specially provided for this. Also, double-circuit boilers can be divided into three groups in accordance with the main heating element:

• A wall-mounted or floor-standing electric boiler inside the tank, which has several tubular heaters, is highly reliable;
• electrode device heating of the coolant, in which it occurs when current passes through the aqueous medium, is very economical;
• an induction unit operating at the expense of an inductor is a new modern heating device.

By power, double-circuit electric boilers are divided according to the parameters of the electricity used:

• single-phase heating device;
• three-phase electric boiler.

The choice of power of the device should be based on the calculations of the parameters of the heated room. Wherein exact dimensions are not enough, since a number of related factors affect the power of the boiler: building insulation, the number of people living in the house, etc.

Principal features of the operation of the electric boiler

A double-circuit electric heating device, both wall-mounted and floor-mounted, works on the principle of converting electricity into heat. This is achieved through heating elements that are responsible for heating the coolant in the heating system and water in the boiler.

The movement of the coolant through the pipeline and radiators is provided by a circulation pump or, according to the laws of physics, in a natural way, under the control of the automation unit. The heating system is equipped with a regulator that sets the temperature regime, upon reaching which the sensor sends the corresponding command to the electric boiler:

• when the set temperature is reached, the heating element is switched off;
• when the temperature indicators decrease to the lower threshold, the boiler turns on again.

Modern programmers allow you to control not only internal system boiler, and the temperature in a particular room. Thanks to such devices, an electric double-circuit boiler will work fully automatically without human intervention.

The safety of modern electric space heating is ensured by a safety system, the price of which does not affect the cost of the boiler, as it is an integral part of it. In the event of overheating of the water, the pressure in the system increases significantly, which leads to the operation of the valve, which releases excess coolant into the expansion tank.

Electric heating boiler with heating elements

The principle of operation of such a heating system is similar to a standard boiler. The heating element of both wall-mounted and floor-standing boilers is a heating element. Moreover, their number depends on the power of the electric dual-circuit device. Heating of the coolant in such a unit occurs according to the flow or forced principle, depending on the design of the boiler.

This type of heating equipment has recently gained maximum popularity among consumers. Heating element boiler has a relatively low price and outwardly attractive design. At the same time, if antifreeze is used as a coolant, then you can not worry about freezing the system in the event of a long absence of electricity in winter period of the year. Modern units are sold complete with automatic control units, thanks to which it is possible to maintain the temperature in a given mode without human intervention.

But such a seemingly perfect heating device has a significant drawback - scale formation on heating elements, which can lead to a sharp drop in boiler efficiency. Therefore, through certain time such a unit needs to be replaced heating elements. To extend the life of the heating element, a water softener is added to the coolant. But this measure does not completely eliminate the problem, but only increases the life of the unit.

Heating with double-circuit electrode boiler

As heating elements in such heating devices special electrodes are used, which transfer the coolant electricity. In this case, the water is heated due to the internal resistance of the latter. Under the influence of current, water molecules are split, leading to ionization. The particles, having been charged, begin to move towards the electrode corresponding in polarity, due to which the coolant is instantly heated.

The electrode double-circuit boiler, due to its compactness, often has a wall-mounted design, while its price is quite low. In the event of a coolant leak it automatically stops working which ensures its high security. But due to significant shortcomings, such equipment is not widely used:

• the coolant must be prepared in accordance with characteristic features water ionization;
• when the speed of movement of the coolant in the system decreases, the boiler will instantly overheat;
• electrodes wear out quickly and therefore require regular replacement during operation.

Heating system with induction boiler

Convert electricity to thermal energy in an induction double-circuit boiler, it occurs by means of an inductor. Under the influence of the induction field, energy is transferred between the primary and secondary coils, during which the coolant is heated. Water, circulating in a structurally complex circuit, is heated from the walls of the hermetic housing, in which the induction coil is placed.

The main advantage of such a heating device is no direct contact of the coolant with the heating element, which significantly increases the operational resource of the latter.

The induction boiler is presented in different configurations and the ability to use any coolant, and also has a high electrical safety. But due to the rather large size and price of the device, it has not found wide application in heating systems.

Equipment selection criteria

In the process of choosing a double-circuit electric boiler of floor or wall type, first of all pay attention to power ratings, on which the heated area of ​​\u200b\u200bthe room, electricity consumption and the price of the unit depend. It is not advisable to purchase a device that is much more powerful than necessary.

When purchasing an electric heating device, it is important to pay attention to the level of noise it produces. Qualitative double-circuit electric boiler is almost silent except for the sound emitted by the circulation pump.

Consumer market heating systems is full of various models of electric boilers, both wall-mounted and floor-standing, produced both abroad and in our country. Their range is huge and it is not always possible to choose the right device on your own. In such situation you can contact the experts in this matter, which will help you choose the best option for price and quality.

The use of electricity as a source of energy for the heating system at home is not always justified due to the high cost of operating costs. But if the main gas pipeline does not pass nearby, then the choice, as a rule, is made in favor of electric boilers. There is a fairly large range of products on sale, but experts recommend paying attention to a double-circuit electric boiler. Its capabilities allow not only to heat the room, but also to provide households hot water.

Advantages of electric boilers and their disadvantages

Ease of installation and ease of use of an electric heating unit, its compactness and aesthetics, and most importantly, safety, attract consumers, despite the costs associated with the use of electricity. But by taking some steps, you can achieve a real reduction in material costs for utilities.

For the possibility of saving the consumed electricity, there is the possibility of stepwise adjustment of the power of the heating boiler.

At night, in many regions of the country there are reduced tariffs. A prudent host will program a more intense heating mode for this period than in daytime when all the household members go on business. For a double-circuit electric heating boiler, it would not be superfluous to calculate the time the boiler is turned on in such a way that, firstly, by the time it wakes up, there is hot water in it. And secondly, the period of water heating would fall at a lower daily rate for paying for electricity.

It will help to reduce the cost of heating a house by almost 30% by installing a temperature controller on each heating battery. In this case, in each room you can set your own thermal regime.

Advantages of heating electric boilers:

• simple management;
• high efficiency;
• noiselessness and vibrationlessness;
• the most complete automation of processes (without human presence);
• the ability to set the most favorable temperature conditions;
• no need for separately located rooms (for installing a boiler with a boiler and storing fuel), as well as in a chimney;
• easy maintenance (cleaning of the burners is not required);
• low fire hazard (no source of open fire);
• environmental friendliness - no carbon monoxide;
• facilitated installation;
• variety of design and size range;
• affordable price and low maintenance costs.

Electric double-circuit boilers are used not only as an independent unit. Often they are built into combined heating systems paired with a gas boiler, solar systems, or solid fuel equipment. In this case, they perform the function of the main or backup boiler.

But despite all the advantages, it is not recommended to install a double-circuit electric boiler in large-area houses - the high price of electricity makes this option unprofitable. More right decision will be the choice of a universal multi-fuel model of the unit.

But the disadvantages don't end there. A common problem is power outages and power surges. This is especially acute far from the city, when, due to snowfall or slush, it can be difficult for emergency services to quickly reach the place of a wire break. The installation of a combined modern boiler or additional solid fuel equipment will help to avoid hypothermia at home during the cold season.

Another unpleasant nuance that a homeowner may face. This is a small cross section of the supply or internal wiring cable. AT best case, insufficient power will limit the operation of the boiler, and in the worst case, it can lead to a fire or a blackout in several houses. In this situation, you should either abandon the electric boiler, or change the cables, or run a separate power wire to the equipment.

Design features

A double-circuit type heating boiler is distinguished by a simple device, although it performs the function of a mini-boiler room. Both of its circuits can work both separately and in pairs, heating the house and providing hot water at the same time. The considered equipment consists of the following components:

• heat exchanger;
• boiler;
• heating elements;
• expansion tank;
• circulation pump;
• air vent;
• safety valve;
• automation;
• control unit.

Electric double-circuit differ from single-circuit models by the presence of a built-in boiler in the design.

By appearance and main design features models of electric boilers can be:

• wall-mounted - compact and relatively light;
• floor - massive, with a high power index (more than 60 kW).

As the name implies, the heating equipment of the first group is mounted on walls or on specially installed metal frames. The second group of boilers is placed directly on the floor in a specially designated place. It should be noted that modern electric boilers are quite aesthetic and in no way can spoil the interior of the room.

According to the method of heating can be divided into three groups:

• TENovye - highly reliable, having one or more heating elements inside the tank in the form of a metal tube;
• electrode (or ion) - heating the coolant in the process of passing through a liquid medium alternating current. They have the ability to self-shutdown in case of a short circuit, a maximum increase in temperature and a decrease in the volume of water to a critical level;
• induction - functioning thanks to inductors. They are energy saving devices.

The first option refers to indirect heating of the coolant, and the second is considered as direct heating.

By power, electric boilers intended for heating needs can be:

• single-phase (up to 12 kW);
• three-phase (more than 12 kW).

It is recommended to select power with the help of specialists, since only they are able to make a competent calculation. The method of choosing a boiler according to the area of ​​\u200b\u200bthe house is incorrect, since in addition to this parameter, a number of others are also taken into account (wall thickness, number of openings, orientation to the cardinal points, etc.).

As a rule, household heating units operate from a 220V network.

Principle of operation

A double-circuit electric boiler for heating a house works on the principle of converting electrical energy into thermal energy. This process takes place with the help of heating elements, which are one of the main components of the equipment. They are responsible for heating water for household needs and coolant.

The circulation of water through the pipes is carried out due to the operation of the pump or in a natural way, and the situation is controlled by automation.

The heating system has a temperature regulator that gives the appropriate signals:

• upon reaching the required indicators - to turn off the heating;
• when the temperature drops to the programmed values ​​- to turn on.

Some types of programmers allow you to set the necessary heating modes, depending not only on the temperature of the indoor, but also the outdoor air. With their help, independent regulation of the boiler operation in offline mode is carried out.

Control over the operation of the heating boiler is carried out using the built-in control unit.

Any modern electric heating boiler is equipped with a safety system, which, as a rule, is not reflected in the price. When the coolant overheats, the maximum allowable indicator of its pressure is exceeded, after which the safety valve is activated. The control function is performed by a thermal switch.

TENovye electric boilers

The principle of operation of this type of heating equipment resembles the operation of boilers or electric kettle. As a heating element, one or more heating elements are installed inside each container (designation of a tubular heating element). Their number depends on the power characteristics of the boiler. The heat carrier, in this case, is heated in the flow mode, which contributes to its natural circulation inside the heat pipe.

Boilers with heating elements are currently the most common and in demand in relation to other models. They are relatively inexpensive and attractive in design. Water or antifreeze can be used as a coolant. Depending on the model, TENovye boilers are equipped with different temperature sensors, which make it possible to maintain the thermal regime of the room, depending on the temperature of the coolant or ambient air. The second version of the sensor is more accurate, but its location must be outside the boiler.

Electric boilers with heating elements are easily regulated, you just need to turn it on or off required amount heating elements.

Among the disadvantages of this unit, one can name the formation of scale on the surface of the heating element, which gradually leads to a decrease in heat transfer, and its burnout over time. Similar problems lead to the replacement of the heating element.

Water softeners, which are added to the coolant, help extend the life of the heating element. But this measure will be temporary anyway.

They differ in their way of heating the coolant. The role of the heating element here is played by the electrodes, although they do not bring the water to a hot state. An electric current is transmitted to the liquid medium, and the water is heated due to its own resistance, which occurs in the process of further reactions.

At the moment of exposure to current, water molecules are split, resulting in ionization. Charged particles begin their movement to electrodes of different polarity, and meanwhile the coolant heats up, and instantly. An interesting fact is that the deposition of sediments and scale, in this case, does not occur.

Ionic electric boilers are much more economical than heating elements, and small chambers are quite enough for the ionization process.

Electrode boilers have compact dimensions and relatively low cost. When the coolant evaporates or leaks from the system, the equipment stops its operation. This provides a high degree of security. But the disadvantages of ion boilers speak for themselves:

• water must be treated appropriately so that its characteristics match regulatory requirements. It is almost impossible to do this on your own;
• in case of a decrease in the rate of water circulation in the system, the liquid will boil, and if the coolant moves too quickly, the boiler will not even be able to start working;
• antifreeze is not allowed;
• electrodes require periodic replacement due to the fact that during operation they begin to dissolve.

Induction boilers

Many claim that they are an innovative development. But the physical phenomenon called induction was discovered in the first half of the 19th century.

Electric energy in an induction boiler is converted into heat thanks to an inductor. Schematically, this process can be described as follows. Under the action of magnetic induction, energy is transferred from the primary winding of the coil to the secondary, where it is converted into thermal energy. The coolant, circulating inside the welded housing of a complex configuration, is heated from the metal walls, which hermetically surround the inductor. Having passed through the entire "maze", the coolant becomes hot and enters the heating system.

The main advantage of this type of boilers is the absence of direct contact of the heating element with water, which eliminates any damage during operation. Also, there is no appearance of a large amount of scale and leakage, due to the fact that detachable connections is simply not in the design.

Induction boilers are not limited in choosing the type of coolant and have high level electrical safety.

Among the shortcomings, it should be noted the high cost, as well as large, in comparison with the above-mentioned boilers, dimensions.

Equipment selection

Manufacturers offer electric boilers in a huge range, their prices also have a wide range. A lot depends on trademark, additional features and equipment. But this is not the most important thing.

When buying any boiler, the consumer, first of all, will pay attention to its power, which is responsible for the consumption of electricity and, accordingly, the efficiency of the unit. You should not purchase a boiler that has a power rating much higher than necessary, even if a huge discount on the product is offered. Subsequently, you will have to pay much more for the consumed electricity.

If an electric double-circuit boiler is chosen as a backup, then it will be more profitable to look at cheaper models. But if it is intended for the role of the main heating and water heating equipment, then you should not skimp.

The more necessary functions there are in the automation of the boiler, the more economical its operation can be.

When buying an electric boiler, you should pay attention to its noise level during operation. Quality equipment should be practically silent, although it should be borne in mind that the pump will be a little audible. Heaters, depending on the price, may have a built-in stabilizer. Experts recommend choosing just such models so that power surges in the network do not damage the equipment.

It is desirable that the electric boiler is equipped with such a useful function as self-diagnosis. It will help to find out the cause of the problem without the presence of a specialist. Often the unit needs to be simply restarted, and not repaired.

On the market there are floor and wall electrical models boilers of domestic and foreign manufacturers. Their choice is huge, and it is not always possible to cope with the task on your own. In this case, you should contact the specialists of specialized companies who will individually help you choose a boiler.

Given the difficult climate of our country, every resident should take care of installing a heating system in his house. However, what should those citizens do if there is no gas pipeline in their place of residence? Is it possible to use the oven for this?

Such a solution will not be optimal, given that today a simpler option is available to each of us - a double-circuit electric boiler. It is distinguished by the absence of difficulties in maintenance, compactness, as well as the ability to automatically maintain a predetermined thermal regime in the room. These devices are presented in great variety, which allows each consumer to choose the option according to their requirements.

Features of double-circuit boilers

The main function of any heating device consists in heating the coolant and ensuring its entry into the system. This is also true for double-circuit electric boilers. Being similar in this regard to other heating devices, these devices provide a simpler design, unlike models that run on gas.

Depending on the principle of operation, these plants can be classified into single-circuit and double-circuit ones. The capabilities of the latter allow solving the problem of space heating, as well as acting as a device that provides the house with hot water for household needs.

Features of the electric boiler

When using such devices for heating water, the following can be used:

Double-circuit electric heating boilers are presented the best option for those houses to which hot water is not supplied. This is due to the fact that this device can, in addition to maintaining the optimal thermal regime in the house, also provide the people living in it with hot water in a volume that is enough to meet the needs of the family. Among their advantages are safety at work, the absence of harmful emissions, as well as the ability to work in automatic mode, which is primarily relevant for those owners who are forced to spend a lot of time away from home.

The design of the considered heating devices provides for two circuits, each of which is independent device. The task of heating falls on the first circuit, and the supply of residents with hot water falls on the second.

The standard version of the electric double-circuit heating boiler provides for in the constructive plan the following components:

• thermal heaters (usually two);
• expansion tank;
• safety valve;
• air vent;
• circulation pump;
• automation system.

The principle of converting electrical energy into thermal energy allows electric boilers to effectively perform their task, for which tubular electric heaters (heaters) are used. These elements built into the heat exchanger and provide heating of the coolant. In this case, the function of ensuring its movement is assigned to the pump.

The control unit monitors the operation of the device. If the temperature drops below the optimum, then the regulator will send a signal to activate the heating mode and start the pump, which regulates the level of the working pressure of the coolant. After optimal value is reached, the units of the device start switching off one by one.

Double-circuit electric boilers produced today are often equipped with safety systems. Control over their work is entrusted to the safety valve, which is activated at the moment when the coolant pressure in the system rises above a critical level. In case of overheating of the heating block in such devices, a special thermal switch is provided, which is triggered when the temperature rises above the limit level.

Equipment Features

To understand how they differ from each other certain types heating devices, it makes sense to study a model from one manufacturer. As an example, the following will consider different models from Bosch.

The range includes boilers electric double-circuit. Germany has been holding the status of a country in which heating appliances are produced for many years. High Quality. In addition to high reliability, German installations also have affordable price. For those consumers for whom the price of the device is not so important, it makes sense to give preference to Bosch products. One of his products, model GWR 5/15, can use a single and three-phase power supply for operation. Each of these devices is equipped with an expansion tank, as well as a circulation pump.

Electric heating devices representing the manufacturer in question, have a number of advantages:

Most often, consumers opt for dual-circuit models, and this is no coincidence. The fact is that with their help you can simultaneously solve two problems: heating the house and supplying hot water. However, even against the background of the presence of such advantages, they failed to gain the same popularity as gas equipment.

The reasons that led to this situation are the following:

• high price of energy;
• not all sites have the ability to allocate 10 or more kW required for large houses.

For this reason optimal solution From an economic point of view, it seems to be the use of these devices in case of interruptions in the operation of the gas main or in combination with a solid fuel boiler. What makes them different is that they do not have to comply with strict installation regulations, unlike gas equipment. For this reason, it is on their side that superiority is found among all types of heating devices currently available.

The question of cost is sometimes decisive

The price of a double-circuit heating boiler is formed under the influence of several factors, but the brand comes first. The cost of models offered by popular European manufacturers is higher compared to Russian counterparts. For this reason, in order not to make a mistake with the choice of a device, one should also take into account such a significant factor as the price.

Among the available brands, the most famous Vaillant, Protherm, Baxi. The price for these products is about 500-1000 euros. Moreover, against the background of gas models, they are quite affordable. The reason for this difference in price lies in the power of heating boilers, the number of circuits used, as well as other design features.

With a small budget, consumers should consider the most affordable imported models or products offered by a local manufacturer.

It is worth noting that, although the latter are quite cheap, they still have the same workmanship as foreign economy class models.

Many local enterprises in the manufacture of their devices often include elements from foreign manufacturers in them, which allows you to be sure of their reliability. These, for example, include electric double-circuit heating boilers of the RusNit brand, the minimum price for which is 150 euros. Such a low price bar makes these devices affordable for the most economical buyers.

Whose product is better?

If you faced such a task, then you probably tried to find the answer to this question. But it's not all that simple. First of all, you need to proceed from the requirements that the selected device must meet. If you need a heating boiler, which will act as the main source of heating the coolant, then when choosing, you should take into account parameter such as economy.

In this regard, the models offered by manufacturers from Germany and Italy can be considered leaders. In the manufacture of their devices, they use the latest developments, which enables them to reduce electricity costs. If a double-circuit boiler for heating a house will have to perform the functions of a backup device, then cheaper models can also be considered. They can be a good replacement while the main heater is being repaired, or in case of an unexpected breakdown.

However, it is imperative to take into account such a parameter as boiler power. If you calculate it correctly, you can reduce the cost of electricity and at the same time increase the efficiency of its work.

How to choose an electric boiler?

The difference between a single-circuit and a double-circuit boiler lies in such characteristics as power and the ability to act as a "flow" for a long time. Therefore, in order not to be mistaken with the choice of an electric double-circuit heating boiler, you need rely on the following parameters:

• it should be a model of a well-known manufacturer, which has a wide network of dealer and service centers;
• power must be sufficient so that the device can solve the tasks. Moreover, it must be equipped with at least 3 heating elements. Before heading to the store, you should find out the heat loss in your home. It is best if this work is done by a specialist or you can use special online calculators;
• the model should provide for a multi-level security system. When heated, the temperature should not rise above 90 C, in case of overheating, a protective mechanism should work, a dry run is required, etc.;
• even before buying a boiler, resolve the issue with additional equipment, which means heat accumulator, stabilizer. With these devices, it is possible to practically eliminate the defrosting of the heating system and avoid overhaul which requires a lot of expenses.

Keep in mind that it is advisable to install floor models in a dedicated utility room unlike wall-mounted devices, which have no restrictions in this regard.

Price for some models

Today, most users speak positively about a small group of devices represented by brands such as Evan, RusNit, Kospel, OSO, Combi, Proterm.

The price of electric boilers to a large extent depends on the brand. If you take products well-known manufacturers, then they are twice as expensive as their Russian competitors.

A double-circuit boiler is a reasonable solution, since with its help you can provide the house not only with heat, but also with hot water. However, before making a final decision, it does not hurt to read reviews about the model you are interested in and find out the opinion of experts.

Heating and hot water supply with an electric boiler is not an easy solution, since the price of electricity is quite high. However, in addition to the price for electricity consumption, which can be a serious disadvantage when deciding to purchase such a device, a double-circuit electric boiler, perhaps, can only boast of benefits.

Heating electric boilers are environmentally friendly, safe, very compact, often attractive in design, do not require a specially designated room. Wall-mounted electric boilers practically do not take up space at all, which is important with a limited area. In addition, they operate quietly, have up to 100% efficiency, and are easy to install and maintain.

Usually, the decision to buy a double-circuit electric heating boiler is made due to the inconsistent nature of the heating of the room, for example, residents visit the room occasionally, occasionally, or with the inability to connect another type of heating: a very small area, lack of communications. Electric boilers are not considered an economical option and are designed as an alternative heating device for cases where otherwise is not possible.

Electric double-circuit heating boilers are an excellent option for summer cottages, for installation in an apartment as a safety net, for heating it when central heating is already turned off, as well as for a private house whose residents want to have the most comfortable option for heating and hot water supply.

How are they arranged?

The electric boiler is powered by a single-phase (220 V) or three-phase (380 V) network. The power of the device is from 2 to 60 kW and above. Boilers with a power of 12 kW or more require only a three-phase network.

Double-circuit electric boilers have a simple device:

• heat exchanger with thermal heaters;
• safety valve;
• air vent;
• Control block;
• pump.

The pump is needed so that the heat spreads faster through the pipes, without requiring additional expense electricity, but it is not a mandatory element of the electric boiler. The electric double-circuit heating boiler works with two circuits that operate independently of each other: one is responsible for heating, the second for providing hot water.

Principle of operation

In thermal heaters, often these are heating elements built into the heat exchanger, Electric Energy turns into heat and is transferred to the coolant, the movement of which is provided by the circulation pump. The safety system provides for monitoring the pressure of the coolant, in case of exceeding which, in order to avoid overheating of the heating block, a switch is activated that reacts to the temperature level.

Types of electric boilers

Electric boilers are floor and wall. Usually they are all equipped with a pump, expansion tank, programmer. Such boilers are easily controlled and practically invisible during operation. According to the principle of operation, there are also combined boilers that operate simultaneously on electricity and solid fuel or electric-gas boilers.

Installation of electric boilers

Installation requires only one thing: connection to a constant power supply, as well as water supply, if provided double-circuit heating. Electric boilers usually serve for a long time and reliably. However, network surges have the potential to harm such equipment. For those who decide to buy an electric boiler for heating, before installation it will be useful to make sure that the supply of electricity is uninterrupted and uniform, strengthen the wiring and provide grounding.

If the issue of power outages is not resolved, when buying, you should pay attention to the readiness of the device to withstand such fluctuations, perhaps choose a more expensive imported model.

For example, many who purchased a Russian-made ZOTA electric boiler faced the failure of some elements precisely due to network outages. The domestic electric boiler ZOTA is equipped with an overheating sensor, but in case of violation of operational requirements, if the voltage in the network rises above 240 V, the boiler may overheat above the established norm.

Costs associated with electric boilers

The cost of electric boilers is relatively low, which allows you to purchase equipment as a spare source of heating. The costs of electricity and boiler power are made quite simply: with an average room height of up to 3 m for every 10 square meters. accounts for the consumption of electricity in 1 kW. However, for full-fledged calculations, it is necessary to know the volume of water in the system and the average consumption of kW per hour, the temperature outside and the desired temperature in the room.

On average, to achieve a temperature of +22 - +24 during typical winters for heating 10 sq.m. an electric boiler will require 8 kW per day, and about 200 kW per month. Thus, an apartment of 50 sq.m. will require about 1000 kW for its heating.
However, this figure is highly arbitrary.

Automation, which is equipped with any electric boiler, controls the achievement desired temperature, transferring the boiler to the support mode of the received mode.

Thus, the boiler works intermittently, respectively, the boiler turns on for heating when the air cools. Given this, the cost of electricity directly depends primarily on heat loss. If the power of the boiler must be calculated in order to purchase a device capable of providing heating at maximum heat loss and frost with a known area, then energy costs can be adjusted already during operation through the competent use of the device and a set of measures in order to save.

Owners of double-circuit boilers should not forget that in addition to electricity costs for heating, additional expenses will also be needed for heating and water supply. From those who have already purchased the reviews are generally positive, including feedback on heating costs. Some owners of electric boilers, admitting that it is not cheap, note that it is still cheaper than paying the housing office for heating.

Considering that electric wall-mounted double-circuit prices are reasonable, and it is a pleasure to use them, it is possible that ease of use compensates for the considerable waste of electricity and draws the attention of users to ways to save money when operating electric boilers. This is evidenced by the reviews of their owners.

For example, those who bought Rusnit electric boilers are quite satisfied with the ability of the boiler to heat large rooms even in 30-degree frosts, however, they regret that these boilers are not equipped with a chronothermostat, as is the case in other electric boilers. Chronothermostats, or programmers installed on electric boilers, allow you to set a weekly energy-saving program, which allows you to save on heating.

How to save money with an electric boiler

Since the main disadvantage of electric boilers is the price of electricity, and in other characteristics, this is perhaps the most attractive option for heating and hot water supply, the issue of saving electricity for these types of boilers is especially acute. Despite the widespread opinion about how prohibitively expensive, with a frugal approach, you can reach quite affordable costs with quite significant benefits.

There are a number of ways to reduce electricity costs when using such boilers:

We should not forget about the savings from the very choice of an electric boiler. There are a number of factors that can be attributed to different types of savings when using electric heating:

Electric boilers have many advantages, with a competent approach they are not as expensive as it might seem, and in any case they have the right to be a worthy alternative for temperature equalization when using other types of heating systems and as a backup option.

All designs are made of stainless steel and have compact dimensions.

As you know, 1 kW of current power goes into 1 kW of heating power. For heating larger area you need a boiler with a power of more than 17 kW. Depending on the power, the boilers can be powered from a single-phase or three-phase system. Single-phase boilers are used for heating a private house or cottage up to 100 m 2. A single-phase design assumes power from a conventional 220 V socket. A three-phase boiler is used to heat an area of ​​​​more than 100 m 2, and requires power from a separate 380 V line.

The principle of operation of a two-circuit generator

Like any electric boiler, it works on the principle of converting electricity into heat. Passing through the heated assembly, the liquid, under natural or forced action of the circulating pump, passes through the system.

All control operations are carried out through the control unit. If the temperature drops, the regulator signals and the heating pump is switched on. The same actions occur in the second circuit when hot water is turned on at the tap. In this case, the regulator is affected not by the falling temperature, but by the throughput pressure of the water. Similar typical scheme can be seen in the presented figure, where the red lines show the return, and the blue lines show the return.

When the pressure in the heating system rises, the safety valve is activated. Overheating is excluded due to the built-in thermal switch.

Mounting Features

The main thing when installing a double-circuit boiler is to make the heat system safe and uninterrupted. For this you need to provide:

1. Grounding.
2. Shutdown protection.
3. Voltage regulator.

Binding of a double-circuit boiler

When installing a double-circuit electric generator, the main thing is to correctly calculate the circuit (we already talked about this HERE) and perform the piping. Properly performed piping will not create large temperature differences at the inlet and outlet. The liquid, heating up, initially circulates in a small circuit, while the loan, reaching the required temperature, enters the pipes and radiators of a larger circuit. So it is important to provide two circuits in the circuit.

The following elements of the chain are included in the piping: Distribution valve, balancing valve, circulating pump, pressure gauge, radiators, flow filter, pipes, tees, valves (return, air, safety), adapters, fasteners. All this must be calculated according to the scheme and purchased before installation.

Double-circuit heat generators can be mounted according to the following scheme options:

1. natural circulation.
2. Forced circulation.
3. Classic.
4. With the help of primary and secondary rings.

For example, we present a diagram with forced circulation fluids in the system. The diagram shows the following elements: 1 - temperature controller in the room, 2 - safety unit (manometer, safety valve), 3 - batteries, 4 - electric double-circuit heat generator, 5 - expansion tank (closed), 6 - circulating pump, 7 - valve for filling the system with water, 8 - anti-condensate pump, 9 - return valve, 10 - minimum temperature sensor.

The peculiarity of the installation of a double-circuit generator is that it is necessary to carry out direct and mixing at the same time.

Pros and cons of a dual-circuit generator

The main advantages of electric double-circuit heat distributors include:

1. Compactness. It makes it possible to install the boiler even in small rooms.
2. Environmental friendliness. Does not produce harmful emissions and does not absorb oxygen.
3. There is no need to additionally install a chimney pipe.
4. Noiselessness. Only the circulating pump makes sounds. Can be installed even in bedrooms.
5. Fireproof. Since no open fire is used, this the best way for a wooden private house.
6. Installation and maintenance can be done by yourself.
7. No additional permits are required to install a hot water column.

But user reviews also speak of the minuses:

1. The scale that forms inside the system can quickly disable the boiler.
2. Use for installation in large rooms is unprofitable.
3. A separate power supply is required. And these are additional costs.
4. It is not uncommon to read reviews that the boiler is ineffective for heating a larger area.
5. If you install it incorrectly and select the power of an inappropriate network line, a short circuit will occur, which will de-energize the entire street.

Despite the negative reviews, a double-circuit electric boiler is one of the best solutions in a private house with no gas supply.

How to choose a model

A light weight, small size and a wide range of models make it possible to choose a boiler for any private house. When choosing, you need to build on the requirements that the boiler must meet for a particular system.

If the use of an electric double-circuit boiler is meant as the main one, then power and efficiency should come first. These indicators are on top of Italian and German heat generators.

If the processor is planned as a backup or additional equipment, then you can purchase an inexpensive boiler. But you should not forget about power anyway. These models include boilers Russian production. Reviews about them as about additional equipment not bad.

For a garden or country house, you can use the most low-power ones, so the power consumption will be minimal.