The climate control company Termomir offers a wide range of electric boilers different power. Read the information or call our consultants to choose the right boiler model.
Electric boilers are designed for heating private house, dacha, apartment (including for apartment heating) , various administrative, commercial and industrial facilities ranging from 30 to several thousand square meters. m. Electric heating is optimal where there is no main gas or where there are strict requirements for the environmental friendliness of heating devices. Also, an electric boiler is often used as a backup heating option in case of problems with the main boiler, for example, a gas one.
An electric heating boiler consists of a heat exchanger, a block of heating elements, a control unit and control and safety devices. Some electric boilers are equipped with a circulation pump, expansion tank, safety valve and filter. The coolant heated by electricity circulates through a system of pipes and radiators, providing space heating, as well as heating water in the boiler. An electric double-circuit boiler is used for heating and hot water supply, a single-circuit boiler is used only for heating a house, as well as for heated floors.
pros:
Compared to boilers using other types of fuel, electric boilers are cheaper, more compact, safe and silent. Connecting electric boilers is much simpler and less expensive than other types of boilers. Due to their compact size and light weight, electric boilers are wall-mounted, do not require a separate boiler room, and installation is allowed in utility or utility rooms, storerooms, kitchens, basements, and even in living rooms.
Electric boilers are easy to operate and do not create harmful emissions or foreign odors, do not require constant maintenance, expensive cleaning or regular fuel purchases.
Minuses:
Dependence on the stable availability of electricity and high demands on the quality and reliability of electrical wiring. You should also take into account the fairly high cost of electricity. To make an informed decision about purchasing an electric boiler, it is recommended to make a preliminary calculation of electricity costs.
The boiler will be used in the Russian climate on average from September to April inclusive, i.e. only 8, not 12 months a year. In autumn and spring, the boiler will be used at a minimum, in winter - at full capacity. Thanks to the built-in automation, the boiler will not operate continuously, on average about 8 hours a day, so the approximate energy costs for the year can be calculated using the following formula:
240 days X 8 hours a day X boiler power X cost of 1 kW of electricity
Electric boilers with a power of up to 12 kW are available in single-phase (220 V power) and three-phase (380 V power), and boilers with a power of more than 12 kW are only three-phase. Most electric boilers with a power of more than 6 kW allow multi-stage power adjustment.
Various remote programmers that can maintain the room temperature according to a user-specified schedule help save energy without sacrificing comfort.
To select an electric boiler, you need to find out the power of the device. Basic calculation – 1 kW of boiler power is enough to heat 10 m2 of a well-insulated room with a ceiling height of up to 3 m.
To select a specific electric boiler model, you can contact the consultants of the Termomir company. Remember that in addition to the boiler itself, it is necessary to purchase other elements of a complete heating and water supply system (radiators, pipes, pumps, thermostats, boiler and much more), so it is better to entrust the selection of equipment and its complete set to professionals.
Currently, our company’s product range includes both the best electric boilers from European manufacturers and good inexpensive Russian electric boilers.
See also:
When it is not possible to supply gas to the house, the problem with autonomous heating and hot water supply must be solved with the help of alternative sources energy. You can install solar generators, heat with wood or pellets, but if you are used to not only living in warmth and comfort, but also spending a minimum of effort on it, a double-circuit electric boiler may be the solution.
It is capable of heating the house and providing the required volume of hot water.
The design of a double-circuit boiler involves placing two heating elements in one device for heating water and coolant. The system works by converting electric current into thermal energy.
Design features of a double-circuit boiler
To heat the room, a closed-type heating circuit is connected to the boiler, through which the coolant moves. The second pipeline is designed to supply hot water, which is heated in the built-in storage capacity or according to the flow principle.
During the warm season, the heating can be turned off and the boiler can only be used as a boiler.
Two circuits of an electric boiler can function either independently of each other or simultaneously, heating the house and heating water
The device consists of the following main elements:
- housings with thermal insulation, inlet and outlet fittings;
- a heat exchanger through which the coolant circulates;
- control system and automation unit, which allows you to set temperature parameters and turn off/on the device;
- heating device;
- expansion tank for pressure relief;
- safety valve;
- air vent (automated or manual) to remove air pockets;
- circular pumps for hot water supply and heating systems;
- security groups with temperature sensors and relays.
The principle of operation of an electric boiler is heat exchange: a circular pump pumps water into the tank, which is heated to a certain temperature by a thermoelement and discharged either into the heating circuit or into the hot water system. In fact, a double-circuit electrical appliance, like its gas counterpart, can perform the function of both a home boiler room and flow heater for water.
Advantages and disadvantages of electrical equipment
Electric heating is an environmentally friendly heating method, because it does not pollute the air with smoke and soot like a solid fuel boiler, carbon monoxide and other harmful “works”, such as gas equipment. In addition, the peculiarity of boilers operating on electric circuits practically eliminates emergency force majeure in the event of a water leak - if there is no coolant in the system, the equipment automatically turns off.
An electric boiler has an excellent efficiency indicator - 95-99%, but even such a high heat transfer does not compensate for the high electricity consumption, therefore, in comparison with gas boiler electrical appliance loses
Also, the general advantages of electrical equipment include:
- Easy installation– there is no need to equip a chimney, a forced ventilation system, install a gas pipeline and issue a bunch of permits, as when installing a gas boiler.
- Safety– the likelihood of an electric boiler leaking or boiling is very low, in addition, the design of the device does not provide for the use of open flames, flammable materials and explosive gas.
- Compact dimensions– an important point for small rooms. In addition, the device can be installed not only in places specially provided for by the project (like gas equipment), but in any convenient place where it is possible to connect to the electrical network and heating system.
- Silence– the electric boiler operates without vibrations, “exhausts” and other sounds that plague solid fuel and gas appliances.
- Affordable price both the device itself and its installation and maintenance.
As for the shortcomings, one of the most significant is cost of energy consumed. If we are talking about heating and hot water for a large cottage, the amounts will be impressive, so before purchasing it would not be a bad idea to make at least an approximate calculation of consumption, analyzing information about the area, water consumption and power of the device. And then decide whether the “game” is worth the cost.
The installation of special controllers, storage devices and differentiated meters operating in day-night mode will help to significantly reduce costs.
Other cons:
- Dependence on energy supply– in areas with constant power outages, installing such a heating device makes no sense. However, if outages are random and not the norm, purchasing a generator that stores energy will help solve the problem.
- Mains voltage surges have a detrimental effect on the sensitive automation of the boiler, so before installing the equipment it is worth purchasing good energy stabilizers.
- Since it is used for DHW running water, heating elements gradually covered with scale, which must be removed from the equipment. The solution may be to install filters at the inlet cold water and regular maintenance.
In addition, before installing an electric boiler, it is worth finding out whether your home network is designed for such a load. For example, for an area of 200 square meters you will need at least 16-20 kW. And this is only for heating, without taking into account other electrical appliances. And if in new cottage villages such power is provided by connection to a three-phase network, then for summer cottage Usually no more than 10 kW is allocated.
Types of electric boilers
Modern electric boilers are equipped with heaters with different principles work. But only devices with a heating element design can be used simultaneously for both heating and hot water supply.
Connecting an electric boiler to a heating and hot water system most often involves installing a boiler with a heat exchanger or a container for storing hot water
Other types of equipment can be used for domestic hot water only if an indirect heating boiler is connected to the heating circuit.
Electrical appliances with heating elements
The most common models of electric boilers have built-in heating elements - heating elements, which are made of ceramic or metal, have the shape of rods, a spiral or a hollow rod bent by an arc, inside which a thread of a certain resistance is placed. They act as “intermediaries,” heating up when an electric current passes and transferring heat to the water.
Diagram of a double-circuit electric boiler. The number of elements depends on the power of the device and its internal volume, but additional heating elements not only increase the heating rate, but also the cost of electricity and maintenance
The main disadvantage of the device is the rapid formation of scale on the heating elements, which impairs its performance. For example, with a thickness limescale just 0.5 mm, the efficiency of the device decreases by 10% of the nominal, and at 2 mm - by 35-40%!
As a result, the device heats the water more slowly, so electricity consumption increases. Therefore, the boiler needs constant cleaning and periodic replacement of failed heating elements.
In addition, boilers with heating elements require regular service, because we are talking about the safe use of equipment. The heating element gradually wears out and may burn out.
If this happens with depressurization of the housing, it’s not so bad. In this case, heated nichrome will simply crumble upon contact with water and does not pose a danger to humans. But if the disconnected element remains in the undamaged case and continues to work, the entire metal case, thanks to the water conductor, will be energized.
Induction heating equipment
The operation of an induction boiler is based on magnetic induction, which allows you to convert electricity into thermal energy. Inside the housing there is a primary circuit with an inductive coil, which, when voltage is applied, creates an alternating magnetic field. As a result, so-called Foucault (or eddy) currents arise, which heat the metal, and it transfers its heat to the circulating carrier.
Time-tested heating element boilers can be installed without fear even in a living room, but for induction appliances it is better to provide separate room– despite the advertising statements of manufacturers, medicine has not confirmed the harmlessness of electromagnetic fields to humans
Advantages of induction boilers compared to heating elements:
- Most high level Efficiency – 98-99%.
- Large heating area and, accordingly, faster heat transfer.
- Scale does not form on the heating element.
- Completely autonomous and do not require maintenance.
- In addition to water, petroleum products and oil can be used as a coolant.
The main disadvantage of such devices is the high price and the need to connect an indirect heating boiler or storage tank to supply the home hot water. Therefore, despite a number of advantages of induction equipment, the leadership of consumer demand is firmly held by double-circuit heating element boilers.
Boilers with electrode heaters
The operation of an electrode boiler is based on the high thermal conductivity of water. Inside the housing there are negative and positive electrodes that generate electric current, and coolant circulates between them.
Heating occurs due to the energy that is released when molecules split into charged ions and their movement towards the electrode of the appropriate polarity. Thanks to this, heating of the water in the boiler chamber occurs almost instantly.
A prerequisite for an electrode boiler is good grounding, since the devices are potentially dangerous devices and the body can “pierce” with a strong current charge
Advantages of electrode boilers compared to heating elements:
- Heats water 10 times faster.
- They spend 20-30% less electricity.
- They have compact dimensions even with high productivity (most often models are presented in wall-mounted versions).
- They do not fail during power surges.
But because significant shortcomings Electrode boilers have not yet become widespread. They are mainly used for heating, but it is possible to organize a second circuit for hot water supply if the system is retrofitted with an indirect heating boiler.
These devices are very demanding on the composition of the liquid that serves as the coolant. Regular tap water excluded, it is recommended to use a special liquid with a balanced salt composition. In addition, the electrodes gradually dissolve during operation and require replacement.
Electrode boilers are very compact, but do not have high power, so for heating large areas, modules with several devices connected in series are provided
For safe use, it is recommended to equip the electrode boiler with an additional automation kit, which is sold separately and often costs more than the device itself. First of all, this circulation pump and an electronic temperature controller that controls the heating temperature. A current controller is also needed to regulate the current strength, with the ability to turn off the equipment to prevent water from boiling.
What to look for when purchasing
When you have figured out what type of device you want to buy, it’s time to think about its size and technical parameters. Most often, electric boilers are installed in the kitchen, but you can also equip a mini-boiler room, which will allow you to hide unattractive communications and additional equipment (storage tank, indirect heating boiler, etc.).
Selecting a device by installation method
Regardless of the type of structure, everything double-circuit boilers can be divided into two large groups - wall and floor. The dimensions and choice of model directly depend on the area that you need to heat, and also on the amount of free space for the device itself.
A wall-mounted boiler differs from a floor-mounted boiler in its small size - if necessary, it can be hidden in a wall cabinet or cabinet, but even an undisguised device does not look bulky and harmonizes perfectly with other household appliances
Attachment units are designed for heating relatively small areas - up to 100 m2, therefore they are most often installed in apartments or small country houses. They are attached to special brackets to any vertical surface that can withstand such a load.
Floor-standing boilers are rather bulky devices, but they can provide a house with an area of up to 200 m2 with heat and an uninterrupted supply of water, and storage tanks can either be built into the device itself (which significantly increases its dimensions) or mounted separately
If the cottage area exceeds 200 m2, you can equip a boiler room with several electric boilers or use additional heating sources - solid fuel equipment or solar panels.
How to calculate the required power
The simplest way is to divide the heated area by 10. It is believed that when heating 10 m2, 1 kW will be spent, but the resulting figure will be very arbitrary, because such a calculation makes sense only for rooms with a height of no more than 3 meters. In addition, heat costs largely depend on the presence of insulation, the quality of windows and their sizes, climatic features terrain and materials used in the construction of the house.
If the house has high ceilings, you must first determine the volume of the room (multiply the area by the height). Then calculate required power based on the calculation that 1 m3 will require 35 W.
When purchasing, consider models whose power is 15-20% higher than your calculated values - it is better to set the boiler to a weaker mode than to freeze in the cold winter with equipment operating at its limit.
To the obtained result you need to add a “margin”:
- 10% - with large area glazing ( panoramic windows, veranda, etc.).
- 15% - in the absence of house insulation.
- 10-15% - for areas with cold winters.
- 20% - for additional load when DHW operates in flow-through heating mode.
When calculating the required power for boilers with built-in storage, you need to rely on the data specified by the manufacturer in the technical documentation.
From technical parameters The boiler depends on the way it is fed. Appliances up to 10 kW can be connected to a regular 220 V network, and more powerful boilers can be connected to a three-phase network (moreover, this may require permission from local power grids if a 380 V line is not supplied to the house).
Other important nuances
Based on the principle of heating water double-circuit electric boilers can be divided into flow-through and storage. The first ones - a good option for a small house and family, it can easily serve 1-2 water points in addition to heating. But, despite its compactness and ease of use, the “2 in 1” device has a significant drawback - a high load on the electrical network.
But the storage unit takes up much more space due to the additional tank in which the supply of hot water is stored. The advantage of this type of equipment is that it can supply water in large quantities and allows you to save up to 10% on electricity, since it does not waste energy on constant heating, but only maintains its temperature.
Thanks to the insulating casing, the heat loss of water in the tank per hour will be no more than 0.5 degrees.
In the technical data sheet of the device intended for connection to DHW system, its throughput must be indicated - minimum and maximum temperature, volume of water and the required time for heating it.
Modern electric boilers allow you to control the device and control the heating temperature in the room using smartphones or a smart home system
Additionally, the boiler can be equipped with:
- Automation unit for remote control from a remote control or via a network.
- Frost protection, which will allow you to maintain a minimum temperature in the system, which is important for country houses and country houses where there are no permanent residents.
- Sensors that monitor weather changes turn the device on when temperatures drop and turn it off during sunny hours.
- Equipment that lowers the water temperature for connection to the “warm floor” system.
- Sensors with the ability to program the microclimate in the entire room or individual rooms at your discretion.
Of course, “bonuses” from the manufacturer increase the cost of the device, but with their help it is much more comfortable to operate the boiler.
Ways to save money during operation
To reduce energy costs when using an electric boiler as a heating device and water heater, you need to reduce the overall heat loss at home.
First of all, it is worth replacing the old ones wooden frames modern windows with 2-3 air chambers and take care of wall insulation (preferably external) with foam plastic, mineral wool or other materials with low thermal conductivity
Other saving options:
- Additional connection or separate devices running on alternative energy(solar batteries, wind generators, wood burning fireplace), will significantly reduce electricity consumption.
- A multi-tariff meter will allow you to pay less for night heating, and during the morning and evening “rush hours” the device can be turned off (the most expensive electricity is consumed in the intervals of 8.00 - 11.00 and 20.00 - 22.00). And if you supplement the system with an external heat accumulator, you can accumulate “cheap” energy at night in order to use it during the day.
- Recuperator in ventilation system will help keep the heated air inside the house.
- The weekly programmer will collect data on the operation of the system for a specified period of time in order to select the most comfortable and economical operating mode with minimal energy consumption.
- Room thermostats will monitor changes in the microclimate of the house and transmit data to a sensor built inside the boiler, which will turn the heating off/on, protecting against air overheating and unnecessary heat loss.
At proper organization Using an electric boiler can reduce electricity consumption and associated costs by up to 40%.
Conclusions and useful video on the topic
Nuances of electric heating - boilers and other electric heating devices, calculation of equipment power and costs for the heating season:
Although double-circuit electric boilers seem very comfortable to use, before you go shopping, calculate your electricity costs for the cold period of the year or contact a heating specialist.
Perhaps they will advise you on a more economical system with a single-circuit boiler with an indirect heating boiler or design combined heating, where the “gluttony” of the electrical appliance will be compensated by additional energy sources.
Not the cheapest to operate, but the most environmentally friendly, easy to install and maintain heating device– double-circuit.
The second circuit is designed to provide the house with hot water.
Advantages of electric ones over fuel-using units:
- environmental friendliness and compactness make it possible to place an electric double-circuit boiler () for heating a house in a living space, a boiler room is optional;
- no noise or vibration during operation;
- the most great opportunities for automation, the system requires virtually no user control;
- low cost. Electric boilers are comparable in price only to solid fuel boilers, but are much more convenient and easier to use. They do not require fuel and do not spoil the air in the house.
Disadvantages: electricity costs and dependence on it. Even city networks (especially suburban ones) are subject to power surges.
You have to buy a stabilizer along with the boiler, and outside the city you also have to buy a generator in case of a long-term power outage.
Features and principle of operation
An electric double-circuit boiler for heating and water supply operates due to a tubular element - a heating element.
Single-circuit ones are also electrode and induction, but in double-circuit ones their operating principle cannot be realized.
The unit includes:
- usually two heaters;
- expansion tank;
- automation, air vent (if the system is heavily aired, the heating element may burn out), safety valve.
The boiler is equipped with a circulation pump.
The heating element itself is a metal tube, through the center of which a nichrome conductive thread runs, and the rest of the space is filled with a heat-conducting substance.
The element is built into the heat exchanger. When current is applied, the filament heats the tube, the energy is transferred to the coolant. Circulation is carried out using a pump.
Each circuit is equipped with its own heating element; the circulation rings do not intersect. The temperature in the circuits is regulated separately. The control unit controls the operation. When the temperature in the room decreases, the thermostat starts heating the water in the heating circuit and the pump.
When the set temperature is reached, the operating units are switched off. In the event of a critical increase in pressure in the system, the safety valve is activated.
The emergency temperature switch reacts to an increase in temperature above normal. The heating element of the DHW circuit is turned on when the tap is opened. The distance between the boiler and the tap should be no more than 10 meters.
Types of double-circuit electric boilers
IN individual development, in private apartments and small offices, wall-mounted units () are popular, but there are also floor-mounted electric double-circuit boilers for heating a private home.
The power of floor-standing models is high, 60 kW or more: such a purchase is suitable for a large facility.
A double-circuit electric heating boiler can be connected to three-phase and single-phase network. Units with a power greater than 12 kW are usually designed for three phases. Some models have two circuits for connecting elements, 380 and 220 volts. Switching is carried out using a manual toggle switch.
Boilers differ in DHW options:
- flow heat exchanger. Switching from mode to DHW is carried out automatically when opening a hot tap using a two-way valve. Designed for a small number of water points (up to three);
- double-circuit boiler electric boiler. The tank capacity of wall-mounted models is up to 100 liters, and that of floor-mounted models is up to 300. There are no temperature changes in such a system, but the energy consumption is higher, and the boiler itself is less compact;
- possibility of integration into the indirect heating boiler system. Switching modes is carried out three-way valve. The model includes all the necessary strapping elements, incl. the remote boiler itself. Automation allows you to set weekly settings for the DHW module. The cost of such a system is higher and it requires more space.
Advantages and disadvantages of two circuits
The main advantage of two circuits is compactness. This is relevant for autonomous heating in apartments and small houses. In cramped conditions, one of the main limitations of the boiler (the remoteness of water points is undesirable) becomes irrelevant.
In some cases, a double-circuit electric boiler for an apartment is the only possible variant. In addition, the piping is much simpler than when using the boiler and heater separately. Fewer taps and fittings is a small saving, but still a saving. System calculation and installation are simplified.
The disadvantages include, first of all, the higher price. A single-circuit heating boiler and a DHW boiler in total cost almost half as much.
And this is not the only advantage of separate operation: although the circuits are autonomous, in the event of malfunctions, interpenetration of the media occurs.
It is undesirable to use antifreeze as a coolant: it can get into drinking water or into the shower. In this case, antifreeze is lost without a trace; its amount in the heating circuit has to be replenished.
In large families there is often not enough capacity for hot water supply, so you have to install an additional one in addition to the built-in boiler. The DHW circuit imposes restrictions on the layout of the system: the boiler must be located as close as possible to the water collection points, otherwise the water will cool along the way.
A double-circuit electric heating boiler is more complex than a single-circuit one - this means that it is more susceptible to breakdowns, and repairs are more expensive.
Disadvantages of the heating element: scale accumulates on it, and if the coolant leaks, the element can burn out. But an induction boiler can also burn out in the absence of water ().
Only the electrode apparatus () is free from this drawback, but it is not dual-circuit. The coolant level is monitored by control devices: an accident is possible if they fail. The cost of heating element boilers is lower than others.
Video about a double-circuit electric boiler.
Electric boiler effectively solves the problem autonomous heating apartment or private house. But, in most cases, the consumer needs not only heat, but also hot water supply. A double-circuit electric boiler simultaneously solves two issues: heating residential premises and meeting the need for hot water supply.
How does a double-circuit electric boiler work?
The design of a double-circuit electric boiler has two heating elements that are not in contact with each other. The design feature is that the boiler simultaneously heats hot water and coolant.The operating principle of a double-circuit electric heating and hot water boiler can be described as follows:
- The housing contains a tubular heating element (TEN). When an electric current passes, the inner spiral heats up. The heat obtained as a result of heating is transferred to the heating surface in contact with the coolant.
- Heat transfer from the surface of the heating element to the coolant is carried out through natural or forced circulation liquids in the heating system. The coolant enters a container with an electric heater, passing through which it comes into contact with the heated surface and accumulates heat.
- The heated liquid enters the heating system, releasing heat through radiators or heated floors.
Double-circuit energy-saving electric heating boilers, have a built-in storage tank - boiler. The heated water is stored in a storage tank, with heat loss not exceeding 1°C per few hours. After opening the tap, hot water is immediately supplied to the consumer. The savings achieved thanks to the built-in storage capacity reach 10-15%.
Modern household double-circuit electric boilers from many European companies are created taking into account connection to low-temperature heating systems - “ heated floors", without the need to install additional equipment.
Electric boilers are available in wall-mounted and floor-mounted (stationary) versions.
Mounted 2-circuit electric boilers
Double-circuit wall-mounted electric heating boiler, optimal solution heating the apartment, due to the following advantages:- Small footprint – wall-mounted boilers, are distinguished by small dimensions. If necessary, the electric boiler can be built into a cabinet.
- There is no excess power - the generated thermal energy is enough to heat the apartment.
- Functionality - dual-circuit models, come complete with a built-in boiler, automation controlled by a microprocessor.
Some boilers are designed for connection to low-temperature heating systems, without the need to install additional equipment: a water gun and a mixing unit.
Wall-mounted double-circuit electric boilers are the optimal solution for heating an apartment in a multi-storey building.
Floor-standing electric boilers with two circuits
Installation of a double-circuit boiler in a floor-mounted design is justified for providing heat to a private home or cottage. More powerful devices than their wall-mounted counterparts do a good job of heating living spaces and preparing sufficient quantities of hot water.Double-circuit floor-standing electric boilers take up a lot of usable space. They are produced with a minimum output of 10-18 kW (depending on the chosen manufacturer), therefore, they are mainly used in private houses or cottages.
Greater performance in the design of floor-standing boilers, combined with built-in storage tank(not present in all models), automatic and high throughput DHW. Solutions with the additional connection of an external heat accumulator are popular, which allows saving on electricity by at least 25-30%.
The essence of the solution comes down to the fact that a connection is made to a three-tariff meter. The boiler operates at full capacity only at night, when electricity is available at a reduced price. During this time, the heated water enters the heat accumulator. During the daytime, the boiler turns off.
The coolant is heated using previously stored heat. The solution is optimally suited for low-temperature heating systems.
Choosing a double-circuit electric boiler
As already noted, modern electric double-circuit boilers for heating and hot water are manufactured in wall-mounted and floor-mounted versions. First of all, when selecting, they determine the type of boiler installation. In addition, pay attention to the following technical characteristics:- Heating area - thermal engineering calculations will be required.
- DHW capacity and operating parameters. The documentation describes the technical characteristics of the device: maximum and minimum water heating, the volume of liquid that the electric boiler can heat over a certain time period.
- Additional functions - boilers are equipped with remote control, GSM notification unit, weather-dependent automation.
What power does the boiler need - let’s do the calculation
The procedure for calculating an electric double-circuit boiler includes the need to calculate the total power sufficient separately for heating and hot water supply:- The performance of a 2-circuit electric heating boiler, sufficient for heating residential premises, is calculated using the formula 1 kW = 10 m2. About 15% of the reserve is added to the result obtained.
- Next, the DHW calculation is carried out - for classic double-circuit electric mounted heating and hot water supply boilers operating in flow-through water heating mode, about 15-20% is added to the calculated power + reserve.
- When calculating a boiler with a built-in boiler, they are guided by the manufacturer’s recommendations and the power indicators indicated by him, sufficient for heating water and heating.
The first, single-phase, are produced with a power of up to 8 kW and are connected to a 220V network. IN technical documentation, single-phase boilers, are classified as conventional water heaters (boilers), therefore, when connecting, they do not require additional permits and the allocation of a separate voltage branch.
If the power consumption exceeds 8 kW, install a three-phase boiler. Connection to the electrical network is carried out via a separate 380V branch. If the line is not connected to the house, a request is made to increase energy consumption.
Main manufacturers - who to choose
European companies remain leaders in the production of double-circuit boilers. The models offered by the concerns are characterized by high efficiency, safety and reliability of assembly. In design, used Newest technologies, providing protection of the heater from scale, preventing failure during voltage surges.Domestic electric boilers with two circuits deserve special mention. The products of Russian companies are fully adapted to operating conditions. Although the boilers are inferior in functionality to foreign analogues, they are not inferior in reliability and performance, and in some cases even surpass the latter.
There are several models that are in constant demand among consumers:
- Russia – EVAN Ecowatti, ThermoStyle EPN, Savitr Premium.
- Europe – ACV E-tech S, Wespe Heizung Kombi, Jaspi FIL-B.
- Ukraine – ROSS AOE.
Prices for electric boilers with two circuits
The cost of a 2-circuit electric boiler depends on several factors:- Options.
- Manufacturer and place of assembly.
- Productivity.
Pros and cons of double-circuit electric boilers
In fact, the main difference between single-circuit and double-circuit boilers is the number of heating elements located in the body. In the model with two heating circuits, two heating elements are provided. It is in this feature that all the advantages and disadvantages lie:- Advantages - double-circuit boilers work both to heat water and to heat the coolant. Accordingly, there is no need for additional installation of a boiler or water heater.
- Disadvantages - flow-through heating of water using a heating element is not the best design solution for several reasons. Two heating elements operate simultaneously, which creates a peak load on the electrical network. Even with the use of energy-saving technologies, electricity costs are significant.
Electric heating boilers are actively used for heating country cottages And country houses. They are highly efficient, safe and small in size, and cope well with heating residential buildings. But in suburban housing there is another problem - the lack of hot water supply. The solution to this problem is a double-circuit electric heating boiler - this is a universal device that performs the functions of a real mini-boiler room.
Device and principle of operation
Most electric boilers are built using a heating element design. Inside there are heating elements connected to automation units that heat the coolant, which transfers heat to the heating system. Power is supplied from single-phase and three-phase electrical networks. Due to their high efficiency, electric boilers almost completely transform electrical energy in thermal - their efficiency reaches 99%.
Double-circuit electric boilers are mini-boiler houses that provide your home with both heat and hot water.
Classic boilers have minimum sizes and do not clutter up the space. But they do not solve the problem of lack of hot water - as we remember, centralized hot water supply is only available in cities, in multi-storey buildings. Owners of country houses are left to heat water manually or use electric instantaneous and storage water heaters.
Double-circuit electric heating boilers are no more complicated than their single-circuit counterparts. But they know how to prepare hot water using a separate heat exchanger with a heating element. That is, inside we see two heating elements, an expansion tank, a safety group (or simply a safety valve) and a circulation pump. The main heating element that supplies the heating circuit is turned on in accordance with the set temperature parameters. As for the heating element for the DHW circuit, it turns on only when the hot water tap is opened.
Other schemes internal structure Double-circuit heating boilers have not become particularly widespread due to their imperfect design and many shortcomings. For example, one of these schemes involves heating water in the DHW circuit from the heating circuit.
Electric double-circuit boilers for heating a private house are presented in two types:
- For wall mounting;
- For floor mounting.
Models for floor mounting are the most powerful, so they are used for heating large households. But even in this case, they take up a minimum of space, being miniature. For a small house, a small wall-mounted electric double-circuit boiler is best suited - some lines include quite powerful models for wall mounting0, capable of heating even large households.
Also There are electric double-circuit energy-saving boilers on the market. They are endowed with alternative heating elements. For example, there is a whole niche of electrode boilers, for example Scorpio electric boilers. Being equipped with automation, they provide quick and economical heating of the home. As for induction boilers, they are characterized by increased safety and long service life.
An electrode boiler is a more efficient heating agent than boilers with heating elements.
In fact, the saving effect of energy-saving boilers is quite small, and most of the manufacturers’ assurances about efficiency are most often a marketing ploy.
Advantages and disadvantages of a double-circuit electric boiler
Double-circuit electric boilers are very convenient and practical. They relieve country home owners from problems with organizing hot water supply. What are their other advantages?
- Small dimensions - electric double-circuit boilers are smaller in size than their gas counterparts;
- Silent operation - they do not hum or make noise, so they can be installed in any room;
- Environmentally friendly - electric boilers do not emit harmful compounds and carbon dioxide into the air;
- Quick installation - less fuss with pipes and other connections;
- Fire safety - no need to be afraid of gas leaks, fires and possible explosions;
- Minimal maintenance – most often it comes down to removing dust;
- Possibility of installation in any place - for example, in the kitchen, in the pantry or in the basement of the house;
- High efficiency - as already mentioned, this figure reaches up to 99%;
- Ability to work in networks with voltages of 220 V and 380 V - depending on the power of the equipment used.
Despite fire safety, there is a danger short circuits and overloads. In order to prevent possible accidents, electric double-circuit boilers are equipped with numerous sensors that monitor the operating parameters of the systems.
Unfortunately, double-circuit electric boilers also have certain disadvantages. Here are the most visible disadvantages:
To connect a double-circuit boiler with a power of more than 3 kW, it is necessary to use a separate line with an automatic circuit breaker and an RCD.
- To connect powerful equipment, you need a separate electrical line - this is true for boilers with a power of more than 3 kW (a separate line is laid from the house electrical panel);
- More complex design and high price - you have to pay for convenience;
- High power consumption when operating two circuits at once - here again we see the need for a good line;
- High heating costs - whatever you say, but electric heating can't be called cheap.
We have to put up with these shortcomings, since in many cases double-circuit electric boilers are almost the only way to heat residential buildings and organize hot water supply.
How to choose a double-circuit boiler
When choosing a double-circuit electric boiler for a private home, you need to focus on the area of the household. Here calculations are made based on the area of the premises - for every 10 sq. m. 1 kW of thermal power is required. You also need to consider heat losses. As for the DHW circuit, here you need to look at its performance - optimal indicator varies between 10-14 l/min.
It is more difficult to navigate by trademarks, since there are many strong players in the market. Among them there are not only foreign, but also domestic brands. The latter are cheaper, but some models are inferior in quality. When buying an imported electric double-circuit boiler, you get reliable equipment at your disposal, but lose extra money.
If you choose between electrode and heating element boilers, you should choose models with heating elements. They are characterized by reliability and unpretentiousness to the characteristics of the coolant.
Features of installation and strapping
Connection diagram for a double-circuit electric boiler for heating an apartment and heating water.
There are no special requirements for the installation location of double-circuit electric boilers. This could be a separate room, a niche, a kitchen, a corridor or a basement. The main thing is to ensure natural ventilation devices and take care of the absence excessive humidity . If you choose a floor-standing model, install it on the floor. Owners of wall-mounted models must ensure quality wall mounting.
The electrical part is connected through wires of a suitable cross-section - recommendations for the optimal cross-section are prescribed in the equipment passports. If the equipment power is over 3 kW, a separate electrical line is laid to it. RCD circuit breakers (if they are not available) are installed as close to the boiler as possible. To provide protection against damage electric shock, the equipment is subject to mandatory grounding.
You can find instructions for creating high-quality grounding on the Internet or in books on electrical engineering. It is prohibited to use heating and water pipes as grounding.
Connecting the boiler to the heating system does not cause any particular difficulties - we connect the pipes and check the tightness of the connections. There is no need to install a separate circulation pump, since most often the system already has one. The same applies to the expansion tank. If there is no security group, it is advisable to install one. After installation is completed, the system is filled with coolant and checked.
