When buying a water heater, you need to pay attention to such a parameter as the dimensions of the water heater. Before buying, you need to decide how much an electric storage water heater is needed, and where it will be installed.
From what volume the water heater will have - its dimensions depend directly. Of course, a 50 liter water heater will be much shorter than a 100 liter water heater. The standard diameter of the water heater tank is 45 cm (plus a layer of thermal insulation 3-8 cm thick), regardless of whether its volume is 50 or 150 liters. On average, the diameter of a water heater is 45-55 cm. Only its height changes. Thus, the height of a water heater with a volume of 50 liters is from 50 to 60 cm, the height of a water heater with a volume of 80 liters is from 75 to 85 cm, the height of a water heater with a volume of 100 liters is from 85 to 100 mm, the height of a water heater with a volume of 120 liters is from 100 to 115 cm, height of a water heater with a volume of 150 liters - from 140 to 160 cm.
Connecting a storage boiler to a gas boiler
It is possible to heat water in the unit in question using a gas or solid fuel boiler, a solar water heater or a heat pump. Moreover, its operation is possible in conjunction with heating equipment of two types: single and double-circuit.
According to the standard piping scheme for an indirect heating boiler, it is connected to the heating system, as well as to the branches of hot and cold water supply. At the same time, cold water enters from below, hot water is discharged from the container located on top of the tank, but the recirculation point is located in the middle of the boiler. The direction of movement of the heated coolant is reversed - from top to bottom. That is, from the gas boiler, it enters the upper branch pipe of the water heater, and returns to the heating pipeline along the lower branch pipe of the unit.
The principle of operation and connection of the indirect heating boiler to the boiler
Thanks to this scheme for connecting an indirect heating boiler, the efficiency of this device increases. After all, heat is first transferred to heated layers of water.
Features of connecting an indirect heating boiler to a double-circuit boiler
In order for the boiler to work successfully in tandem with a heating unit with a hot water supply circuit, a three-way valve is used. It distributes the heating medium flow between the additional water supply circuit and the main heating circuit.
A thermostat is installed in the indirect storage boiler. It is he who generates the control signals for the three-way valve. When the temperature of the water in the tank drops below a certain level, the valve, on command from the thermostat, will turn on and redirect the flow to the hot water supply branch from the heating pipeline. Signals from the thermostat will return the valve to its original state if the water temperature in the heater exceeds a preset level. The coolant flow is then directed to the heating pipeline.
When connecting an indirect heating boiler, you must make sure that all communications are possible and also purchase the necessary pressure sensors
In the warm season, the unit works differently: the flow is not redirected, but the combustion modes of the gas boiler are controlled. When the temperature of the water in the boiler drops, the thermostat sends a corresponding signal to the three-way valve. At this "command", the last device "ignites" the main burner of the heating unit. When the water temperature exceeds a certain value, the gas supply to the burner is stopped.
Important! When setting the maximum temperature of the water in the tank (it is also the temperature of the automatic operation of the thermostat), the user should take into account that its value should be less than the value of this parameter set for the boiler automation.
The above scheme works most effectively when using gas boilers equipped with automation and a circulation pump. In this case, the heating unit itself can control the valve according to the signal received from the water heater thermostat. Please be aware that when the water heating system is operating with a three-way valve, the priority of the heater circuit is higher than that of the heating circuit.
Diagram of connecting an indirect heating boiler to a single-circuit boiler
To ensure effective joint operation of an indirect heating boiler with a single-circuit gas boiler, a circuit with two circulation pumps is used. This type of connection can actually replace the above described three-way valve circuit. Separation of coolant flows using pumps through different pipelines is the key feature of this type of connection. The contour priority distribution is the same as in the previous case. However, a higher priority of the water supply circuit over the heating circuit is ensured only through a special setting of the pump activation algorithm.
Diagram of connecting an indirect heating boiler to a single-circuit boiler
The alternating activation of the pumps is also controlled by signals from the thermostat installed in the tank. A check valve must be installed in front of each device. The creation of such a piping for the indirect heating boiler prevents the mixing of the heat carrier flows.
This scheme works like this: turning on the hot water pump is accompanied by turning off the heating pump. That is, the heating system will begin to cool down. However, a noticeable decrease in the indoor temperature will not be observed for the reason that heating water in an indirect heating boiler with a gas boiler will last for a short period of time. The inhabitants of the house will feel this only at the initial start-up.
Sometimes, to create a large area in a building with a comfortable temperature, the owners use several heating units. Then an additional pump is installed in the piping of the storage water heater.
Features of piping for an indirect heating boiler with recirculation
If hot water is not drawn for a long time interval, it will start to cool down. It may take several minutes to wait until the hot stream reaches from the boiler to the final consumer. Reducing the time for draining the cooled water is ensured by using a piping scheme for an indirect heating boiler with recirculation. This is realized by organizing the forced movement of the heated flow through the pipelines closed in a ring.
Wiring diagram for a boiler with a recirculation system
Helpful advice! When choosing a piping scheme for heating and hot water circuits (with or without recirculation), it is necessary to take into account the characteristics of the heating system, as well as to carry out accurate calculations of the equipment power and the level of demand for hot water.
The recirculating solution provides almost instant hot water delivery to any connected plumbing fixture. It provides that another circuit is installed in the piping of the indirect heating boiler, equipped with its own circulation pump, and additional structural components are installed:
- safety valve (designed to protect the water heater from high pressure);
- automatic air vent (prevents the pump from airing);
- expansion tank (performs the function of pressure compensation in the DHW circuit when the taps are closed);
- check valve (prevents backflow of water in the pipeline).
Boiler design "Ariston", principle of operation
All models of ARISTON storage water heaters have a fundamentally identical design, but in different versions. The water heater boiler is a closed cylindrical or rectangular (depending on the model) storage tank for a certain number of liters. Two water pipes are supplied to it - one from the centralized water supply system (incoming), the second pipe for removing hot water (outgoing) for use. The water heater is supplied with a power supply system. The device is equipped with an electronic filling to ensure correct operation and control over it.
Main elements electric storage hot water boiler "Ariston":
- Storage tank, wall thickness 2 mm;
- Thermal and thermal insulation layer;
- The outer casing of the boiler (in plastic or metal);
- Cold water supply pipe to the device with a return valve;
- Water pressure divider;
- Heating element (ten);
- Magnesium anode;
- Temperature control sensors;
- Insulating gasket;
- Hot water outlet pipe for use;
- Capillary, electronic or rod thermostat;
- Mounting bolts and brackets.
The principle of operation of all models of ARISTON water heaters is the same. Water is supplied to the tank under pressure from the centralized water supply system. By means of a diffuser, water slowly fills the inner tank from below and the ten starts to heat this water. When the water is heated to the desired temperature, the heating element is automatically turned off by the thermostat. Hot water under the pressure of cold water supplied from below rises to the top of the tank and is discharged through a pipe as the users consume it. Then the cycle of water supply and heating is repeated.
Performance characteristics of the Ariston water heater, volume 50 liters
General characteristics hot water boiler using the example of the ABS VLS INOX PW 50 3605497 model:
Benefits:
- Water heating acceleration function;
- Security system with automatic shutdown;
- Protection against starting when the tank is empty;
- Blocking of work during power surges;
- Protection of surfaces from bacteria, scale;
- Various types of mounting - vertical or horizontal;
- Automatic diagnostic system;
- Long time to maintain the temperature of the heated water in the tank;
- Relatively low price.
Disadvantages:
- Relatively short-lived service life of the storage tank. With active use of the water heater, the service life of the tank depends on the hardness of the water in the water supply system.
Water heater
The electric model is considered available. But at the same time, they take into account the fact that flow-through structures consume a lot of energy and therefore, for their installation, a separate cable must be installed.
Storage boilers are considered popular models, which are flat, round, oval and rectangular.
By the method of installation, they are:
- Outdoor;
- Horizontal;
- Vertical
Also, water heaters are divided into gravity and pressure models. The first type is used together with a special valve, which, when the water intake is stopped, shuts off the liquid supply at the heater inlet. But a vertical boiler is considered more popular, the volume of which per one water intake point is from 5 to 15 liters.
Heat accumulator for heating boilers: device features and connections
The purpose of using this unit is to collect and store the coolant heated to a certain temperature for its further transfer to the system, when the need arises. Being connected to the water circuit of the room, a battery of this type provides support for the temperature regime, even if the heat source is turned off.
Helpful advice! If the water heating of the house is produced from electricity, the registration of the night tariff with reduced prices for the cost of 1 kW / h.will save on paying bills. The heating system will be sufficiently heated at night, and in the daytime the heat accumulator will work.
The heat accumulator is used to maintain water heated to a certain temperature.
This device has other functions as well. The main ones include:
- reduces fuel consumption by almost a third. In this case, the efficiency of the fuel plant increases;
- protects heating devices from overheating, collecting excess heat;
- heats water for the DHW system. That is, in fact, this is one of the varieties of an indirect heating boiler. The price of this unit varies over a very wide range: from 13 to more than 300 thousand rubles;
- the heat storage tank can connect several heat sources operating on different types of energy or fuel;
- the design of the device allows the selection of coolant at different temperatures.
Heat storage device and rational connection of external devices
The main part of this unit is a cylindrical stainless steel tank filled with a liquid characterized by a high heat transfer coefficient. Its strapping is carried out with heat-insulating material. In combination with the installation of an upper jacket, such a constructive solution increases the cooling time of the heat accumulator. Inside the cylindrical tank there are 1 to 3 heat exchangers. The number of coils is determined by the capabilities and needs of the homeowners.
Heated water from solid fuel or gas boilers enters the cavity of the accumulator tank from above, and the cooled liquid settles closer to the bottom and is pumped back into the boiler for heating.
Diagram of a heat accumulator device with the ability to connect to alternative energy sources
The lower compartment usually has a temperature of the order of 35-40 ° C. Therefore, it is advisable to connect it to the underfloor heating system. The temperature of the middle part is 60-65 ° С. Therefore, heating devices should be connected to it. The upper part of the tank is connected to the hot water supply. The water temperature there reaches 80-85 ° С.
Boiler features
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Features of the Drazice OKC 200 NTR water heater:
- powerful spiral heat exchanger;
- maximum heating water temperature 110 ° C, pressure 1 MPa;
- thermostat;
- safety valve;
- enamelled steel tank;
- built-in magnesium anode;
- high quality polyurethane insulation;
- water heater operation alarm;
- precise control of water temperature;
- the ability to turn on circulation;
- simple installation and connection to the heating water source;
- very fast heating of water.
How to choose a flow type boiler?
Instantaneous water heater connection diagram.
An instantaneous water heater is capable of providing instant hot water supply, while its volumes are not limited. The structure of this type has small dimensions, and its installation can be easily performed in small rooms. The average temperature of water heating when using these structures will be 55-60 ° С. This boiler can be discreetly installed under the sink. It is worth noting that today there are flowing water heaters with a design that can decorate the interior of a bathroom or kitchen. The thing is that the structures have decorated panels - the body is decorated with landscapes, floral patterns and other patterns.
If you don't want to overpay for electricity, it makes sense to choose a water heater that runs on gas. This design is an alternative to electrical options. The cost of gas allows us to talk about savings.In such designs, the chamber can be open and closed. A closed chamber will require additional installation of a chimney, therefore this option may not be suitable for everyone. An open chamber has a natural draft, so the air will be taken directly from the room. The open chamber design also has a disadvantage. This appliance must not be installed in poorly ventilated rooms.
Choosing an instantaneous water heater, you need to pay attention to the power. 18-19 kW may be enough to use such a design in a kitchen or shower, while 25-29 kW will be enough to meet the needs of a bathroom. The power is also expressed in relation to the water produced by the heater. On average, gas boilers have a heating capacity of 17, 15, 10 liters of water per minute.
What is an indirect heating boiler and what is it for
It is customary to call a boiler a heater or a tank that supplies an apartment or house with hot water. In general, there are 2 types of such units: direct and indirect heating. The main difference between the latest version of the water heater is that this boiler generates heat produced by the heating system. The appearance of the indirect heating tank is associated with a barrel. But on the modern market, you can find models that have the shape of a cube or parallelepiped. The former, being made with an indirect heating boiler in the same style, are usually installed directly below it. This solution saves space in the utility room.
The indirect heating boiler can be connected to both gas and electric boilers
Indirect heating boiler: working principle
Water is supplied to the unit for 2 circuits. The first is the heating one, which is connected to the heating system of the dwelling. In the second, the water coming from the water supply system is heated and subsequently distributed to the points of water intake.
Heating circuits are implemented in the considered unit by two methods:
- "Tank in tank". From the name it is clear that this is such an indirect heating boiler, the design of which provides for the formation of a circuit by placing a steel container of a smaller size in the main tank;
- a coil is mounted in the main tank.
Wiring diagram for indirect heating boiler
Both circuits are connected in parallel to the residential heating system. The coolant enters from it into the boiler through a pipeline. To organize effective circulation of the coolant, such a pipeline must be equipped with a pump-mixing system.
Helpful advice! When buying a boiler for a gas boiler, evaluate the capacity of the last unit. It should be enough to ensure the simultaneous operation of the heating system and the boiler turned on for heating.
Cold water is supplied to the tank for heating, and hot water is taken by consumers. It should be borne in mind that many manufacturers produce such an indirect heating boiler with several heat exchangers. This design works more efficiently, but it is extremely rare on the market.
Pros and cons of an indirectly heated hot water boiler
The advantages of the technical solution implemented by this device include:
- during the heating season, the wiring is not overloaded, since the device does not operate from the mains;
- both the coolant and the internal system of the heater do not come into contact with tap water. It follows that such an indirect heating boiler will last a long time;
- hot water will begin to flow into the tap immediately after starting the unit, because its operation is based on the recirculation process;
Diagram of the design of the indirect heating boiler
- A well-designed water heating system based on this device will work efficiently with an optimal amount of costs at the operation stage.
But there were some drawbacks here. Of these, experts point out:
- the installation of an indirect heating boiler with recirculation requires significant preparatory work that requires considerable financial costs, which will negatively affect the family budget;
- a boiler of this type costs much more than electric or gas counterparts;
- the initial heating of water takes about 1-2 hours. During this period of time, the quality of the heating system may deteriorate markedly;
- Having bought a 100-liter indirect heating boiler at an affordable price, you will have to allocate a separate room for its installation. The fact is that even with a seemingly not such a large volume of internal capacity, the external dimensions of such a device are very impressive. Not to mention the 200-liter indirect heating boiler. But the industry even produces 300-liter samples;
One of the disadvantages of using an indirect heating boiler is the possibility of reducing the efficiency of the heating system.
- providing the home with hot water depends on whether the heating system is currently working. But for obvious reasons, there is no need for it in the summer season. There are two ways out of this situation: installation of an individual heating agent supply system serving only the boiler, or installation of a combined indirect heating boiler with electric heating element.
Let us dwell on the last option in more detail. The most inexpensive and for this reason, which has become traditional in the boiler, is the copper heating element. However, due to the intensive formation of scale at high temperatures in hard water, it quickly breaks down. In addition, these deposits reduce the degree of heat transfer from the heating element, as a result of which the power consumption increases.
Helpful advice! The purchase of a combined indirect heating boiler with a "dry" heating element will save on paying electricity bills.
Connecting an indirect heating boiler is an intervention in the heating and water supply systems, therefore, before deciding on the purchase of a device, it is worth consulting with specialists
Such an electric heating element is made of ceramics. And they called the heating element "dry" because it is enclosed in a steel flask. That is, there is no direct contact with water, and, accordingly, no scale is formed. The presence of such a frame leads to an increase in the heat transfer area and to a decrease in the intensity of cooling. That is why less electricity is required for the operation of a combined heating boiler with a "dry" heating element.
How to buy an indirect heating boiler correctly: recommendations and popular models
When choosing a device to provide a certain object with hot water, its appearance should not be the main criterion. It is necessary to take into account the characteristics that directly affect the operating efficiency of the unit of this type. This concerns, first of all, its volume. Moreover, the peak loads on the water heater should be taken into account.
Experts recommend starting from the following values:
- for 1 person, a volume of 50-60 liters will be enough;
- for 2-3 people, you will need a boiler with a volume of 80-120 liters;
- for 3-5 people, consider 120 to 200 liter models.
Modern manufacturers offer consumers a wide selection of indirect heating boilers of various sizes and shapes.
The most popular were, judging by the reviews, indirect heating boilers below the brands presented.
Characteristics of the indirect heating boiler Proterm 200 liters Protherm B200S
The thermal insulation of this unit is made of polyurethane foam. The inherent properties of this material keep heat loss to a minimum. The control panel provides an indication of the temperature of the water in the boiler. The titanium anode and enamelled surface provide reliable protection of this water heater against corrosion and scale formation.A twin steel heat exchanger is located at the bottom of the unit. This allows you to significantly increase the supply of hot water and speed up the heating procedure.
Helpful advice! To achieve maximum efficiency of functioning of the indirect heating boiler Proterm of this model, operate it in combination with boilers "Medved" and "Grizzly" stationary type from the same manufacturer from Slovakia.
Below are the main technical characteristics of the Protherm B200S water heater:
| Volume, l | 200 |
| The form | Cylindrical |
| Type of allocation | Outdoor |
| Number of heat exchangers, pieces | 1 |
| Temperature regulator | Mechanical |
| Water temperature (maximum), ° С | 90 |
| Daily energy losses, kW | 2 |
| Weight, kg | 90 |
Characteristics of the Dražice indirect heating boiler
If you want to buy an indirect heating boiler 200 liters floor-standing, it is recommended to consider the DRAZICE OKC 200 NTRR model from the Czech manufacturer. This company has been producing such equipment for over 60 years, constantly improving its functionality and design.
Boiler model DRAZICE OKC 200 NTRR can be connected both to the heating system and to the mains
The model range includes units that provide significant energy savings. The advantage is the relatively affordable price of an indirect heating boiler 200 liters Drazhice - about 33 thousand rubles, and not to the detriment of the high quality of work and durability. Another plus concerns the question of how to connect the Drazhice indirect heating boiler. There are two options here: to the heating system or to the electricity network.
Technical characteristics of the boiler DRAZICE OKC 200 NTRR:
| Volume, l | 200 |
| The form | Cylindrical |
| Type of allocation | Outdoor |
| Number of heat exchangers | 2 |
| Temperature regulator | Mechanical |
| Water temperature (maximum), ° С | 110 |
| Weight, kg | 108 |
Technical characteristics of the ACV indirect heating boiler
A series of water heaters offered by the Belgian company ACV are durable, reliable, durable, spacious and modern units. To minimize the level of heat losses, the manufacturer paid great attention to thermal insulation. It is made of polyurethane foam - a completely environmentally friendly material, characterized by excellent sound-absorbing properties and a very long service life. The convenience of use is added by the large capacity of the tank. We are talking about the possibility of purchasing a 300-liter indirect heating boiler from this manufacturer.
The technical characteristics of the ACV SMART SLE 300 unit are presented below:
| Total volume, l | 293 |
| Heat input, kW | 68 |
| Heating time up to 80 ° С, minutes | 22 |
| Productivity when heated to a temperature of 40 ° C, liter / hour | 2100 |
| Empty boiler weight, kg | 87,0 |
The ACV SMART SLE 300 boiler is installed in a dry room with a temperature above zero. In this case, it is necessary to choose the correct location for the water heater.
The model of the SMART SLE 300 boiler from the ACV company is equipped with high-quality thermal insulation, which allows to reduce heat loss during operation.
Helpful advice! When installing, it is necessary to shorten the length of engineering communications as much as possible. So, in addition to saving money on the purchase of piping label elements, you can further reduce the level of heat loss. That is, having already figured out how to connect an indirect heating boiler of this model, make sure that the distance of hot water consumption points from the unit is as small as possible.
Water heater Gorenje GBK80ORRNB6
If you are looking for a compact model of a storage water heater that can provide hot water for a house in which 1-2 people live, experts recommend paying attention to this product from the Slovenian manufacturer Gorenje.
The compact GBK80ORRNB6 boiler has two tubular heat exchangers. Its volume is enough to service two points of water intake. The unit is equipped with an electronic control unit. The DHW temperature varies in the range of 15-75 ° С.
The indirect heating boiler from the company GBK80ORRNB6 has a convenient control panel that allows you to control the water temperature
The function of an additional heater is performed by two "dry" heating elements. The model implements several types of protection: from heating without water and overheating, from corrosion (a magnesium anode is installed), from freezing (high-quality thermal insulation is implemented).
Another significant advantage of this unit is the presence of the function of controlling legionellosis (a common pulmonary disease, the habitat of pathogens of which is hot water). In general, today it is one of the best solutions in terms of price and quality.
Technical characteristics of the Gorenje GBK80ORRNB6 water heater:
| Volume, l | 72,6 |
| Heating element | 2 coils |
| Accommodation option | Wall |
| Water pressure (maximum), MPa | 0,6 |
| Weight, kg | 51 |
| Overall dimensions, mm | 507×500×803 |
Features of the water heater Bosch SK 400-3 ZB
The results of monitoring the modern market demonstrate the fact that the range of indirect heating boilers produced by the German concern Bosch contains a very limited number of items. Therefore, this model deserves special attention. It is distinguished by the simplicity of the design solution.
Indirect heating boiler model Bosch SK 400-3 ZB and device connection diagram
The Bosch SK 400-3 ZB is an enamelled tank with a stainless steel coil. The use of a magnesium anode for corrosion protection is not surprising either: this method of combating this phenomenon is very often used in equipment of this type. Serviceability is ensured by built-in thermometer and flange.
It is also possible to fine-tune the operation of this model of the water heater by connecting heated water recirculation with subsequent synchronization with the heating boiler. The insulation is made of rigid foam, not polyurethane foam, which, given the same thickness, provides less reliable protection against heat loss.
Technical characteristics of the Bosch SK 400-3 ZB unit:
| power, kWt | 60 |
| Volume, l | 388 |
| Productivity (maximum) in flow mode, l / min., ΔT = 25 ° С | 24,2 |
| Heating element | 1 coil |
| Accommodation option | Floor |
| Water pressure (maximum), MPa | 1 |
| Weight, kg | 150 |
| dimensions | 710×1681 |
| Heating element connection | Impossible |
Features of the BOSCH WSTB 160 model
It is worth thinking about purchasing this water heater if a gas boiler is installed in the home. Although there is no possibility to connect the heating element here, the recirculation system is functioning.
Boiler BOSCH WSTB 160 has a laconic design, therefore it is very popular among consumers.
This model is adapted to work in harsh operating conditions in the countries of the post-Soviet space. In addition, the BOSCH WSTB 160 unit is suitable for working with hard water. To protect the steel from corrosion, the surface of the tank is covered with a glass-ceramic compound. In order to reduce heat loss, a polyurethane foam fur coat is used. The casing of the unit is soft, made of polyvinyl chloride. Connection type - front, it is possible to use a temperature sensor. The water is heated to 45 ° C within 37 minutes.
Technical characteristics of the boiler of this model:
| power, kWt | 20,8 |
| Volume, l | 160 |
| Accommodation option | Wall |
| Heating element | 1 coil |
| Water pressure (maximum), MPa | 1 |
| Dimensions, mm | 1193×550 |
| Weight, kg | 42 |
Features of the indirect heating boiler Baxi
Often, the owners of country houses choose a boiler, taking into account, first of all, the heating rate, and not its volume. In this case, you should take a closer look at the product from the BAXI GROUP holding (England) of the Premier plus 300 model.
An indirect heating boiler from the Baksi company can be connected to any type of boiler
Helpful advice! If the material of manufacture of this unit - enameled steel or stainless steel - is critical for you, pay attention to its series.In the first case, it will be denoted by the sequence of characters "UB", and in the second - "INOX".
The key feature of this water heater is that the heat exchanger has a specific design - “coil within coil”. And it should also be noted that the Baksi indirect heating boiler is compatible with boilers of any type. In addition, this unit is well protected against corrosion. The rather compact dimensions and low weight of this water heater did not become an obstacle to equipping it with an accurate thermal pump.
Another important plus is the versatility of placement. The design of this model makes it possible to use a recirculation loop. In addition, it is possible to connect a heating element (optimal power 2.7 kW).
Technical characteristics of the Premier plus 300 water heater model from BAXI:
| power, kWt | 30 |
| Volume, l | 300 |
| Heating element design | Coil-in-coil |
| Water pressure (maximum), MPa | 0,7 |
| Accommodation options | Floor and wall |
| Heating element connection | maybe |
| Dimensions, mm | 2040×552 |
| Weight, kg | 60 |
Features of the Hajdu STA 400 C indirect heating boiler
This model may be of interest to a potential buyer by the possibility of more precise adjustment in the presence of a heat exchanger. For example, at a negative temperature outside, this unit can be rebuilt to work together with the boiler, and in the summer it can be connected to a solar collector (when necessary, a heating element is connected).
Some Hajdu boiler models are equipped with a heat pump to keep the heating medium circulating.
The tank and the heat exchanger are protected against corrosion by enamel and an installed magnesium anode. The polyurethane foam insulation is protected, in turn, by a plastic casing. A DHW recirculation system can be connected.
Characteristics of the STA 400 C model:
| power, kWt | 69 |
| Volume, l | 400 |
| Productivity (maximum) in flow mode, l / min., ΔT = 35 ° С | 28,3 |
| Heating element | 1 coil |
| Accommodation option | Floor |
| Ode pressure (maximum) | MPa 1 |
| Weight, kg | 145 |
| Dimensions, mm | 1832×670 |
In conclusion, it must be said that the choice and installation of a combined boiler for a home is a responsible and difficult task, which can be solved by reading the connection diagrams, advice and opinion of specialists, as well as feedback from users of such systems.
