Gas boiler with boiler. Review of alternatives to a double-circuit boiler with a built-in layer-by-layer heating boiler Double-circuit gas boilers for heating with a boiler
The optimal solution for heating residential premises and simultaneously heating water for hot water supply are wall-mounted gas boilers with built-in boiler. Internal organization is in many ways reminiscent of what is used in the classic version of double-circuit heating equipment, with some fundamental differences.
How does a mounted gas boiler with a built-in boiler work?
Gas wall-mounted boiler with built-in boiler for
hot water, has two heat exchangers operating in flow-through heating mode. Secondary DHW circuit, runs inside
storage capacity, which makes it possible to heat water continuously.
The principle of operation of the boiler is as follows:
- The primary and secondary heat exchanger operate in constant mode.
- The boiler is supported constant temperature heating the liquid. There is a coil installed inside the boiler through which hot water circulates. The liquid is heated layer by layer.
- After opening the water supply tap, the consumer is immediately supplied with hot water, displaced by cold liquid entering the boiler.
Gas wall-mounted boilers with a built-in boiler-water heater, they differ, depending on the design, in the following characteristics:
- Type of combustion chamber - gas boilers with an open and closed combustion chamber are offered to the consumer:
- Atmospheric, connected to a standard classic chimney.
- In turbo boilers with a closed combustion chamber, smoke removal and air intake from the street are carried out through a coaxial chimney.
- Storage tank volume – built-in boiler indirect heating, depending on the chosen model and its power, has a capacity of 10 to 60 liters. There are boilers with a larger capacity, but, as a rule, they are made in a floor-standing design.
Indirect heating boiler, equipped with gas heating equipment, with a power of over 25 kW. In boilers with lower productivity, a storage tank is usually not installed.
Choosing a wall-mounted heating boiler with an internal boiler
Wall-mounted gas heating boilers with an integrated indirect heating boiler are presented in a small assortment. The most popular products are from European manufacturers.
When choosing a boiler, pay attention not only to the company that manufactures the equipment and the cost of the station, but also to several other characteristics:
- Storage boiler volume– the capacity of the tank determines how much hot water will be available. For a large family, it is better to choose models with a storage capacity of at least 40 liters.
- Bandwidth- V technical documentation it clearly states how much hot water the boiler can heat within 30 minutes. The heating temperature is indicated as 30°C.
- Power – precise thermal calculations will be carried out by a consultant of a company selling heating equipment. When independently selecting equipment, use the formula 1 kW = 10 m². To the result obtained, add a reserve of 20-30% for DHW.
- Boiler and storage tank protection– the best are considered to be boilers equipped with 2-3 degrees of protection against scale, which is main reason failure of the storage tank.
Rating of brands of boilers with an integrated boiler
The best heating boilers with boilers are made by Czech, Italian and German manufacturers. If the “Czechs” focus on the durability of the structure, then the “Germans” and “Italians” “bribe”
functionality and ease of use.
Based on location, boilers with boilers can be divided into several groups:
- Italy:
- Germany:
- France:
- Czech Republic:
- US/Belgium co-production: ACV.
When choosing, in addition to the brand you like, take into account the number and availability of official service centers. If there are no company representative offices nearby, making repairs and replacing damaged parts will be quite problematic.
For example, replacing automation may take several months. In this regard, optimal choice is Italian technology, service centers manufacturers are located throughout the Russian Federation.
Cost of a boiler with a built-in boiler
Prices for boilers with a built-in boiler are slightly higher than for a classic double-circuit unit. The following factors influence the final cost:
- The manufacturer - Czech, German and Austrian boilers, occupy a leadership position in terms of cost among analogues manufactured by factories located in other EU countries.
- Power – Baxi boiler, Italian manufacturer, 28 kW, will cost approximately 1800 €, and for a 32 kW unit, you will have to pay 2200 €.
- Combustion chamber type– the most expensive models are those with a closed burner device using condensation principle heating the coolant. Atmospheric analogues cost 5-10% less.
- Throughput and storage capacity. Wall-mounted gas boilers for heating and DHW heating with a built-in boiler, capable of heating 14 l/min, will cost approximately 1600 €. Analogs, with throughput 18 l/min, already cost 2200 €.
In each case, an individual approach to the selection of heating equipment will be required, depending on the actual needs of residential premises for heat and hot water supply. If necessary, you can save 15-20% by choosing a similar one
technical parameters model, different manufacturer.
What does a built-in boiler give to a mounted gas boiler?
The built-in boiler in gas wall-mounted boilers not only provides comfort and ease of use, but also affects the performance of the equipment, extending its service life.
Storage tank acts as a buffer tank that prevents overheating of the coolant and helps reduce gas costs.
Choosing a boiler with a built-in heat accumulator, among other things, is economically justified and has several advantages that are taken into account when choosing equipment of this type. If you have doubts about the advisability of purchasing, they can help you make a decision real reviews consumers, helping to create a complete picture of the advantages and disadvantages.
Advantages of boilers with built-in boiler
As customer reviews show, gas wall-mounted boilers with an indirectly heated storage boiler have several
positive aspects related to the operating principle used:
Disadvantages of built-in boilers in boilers
Mounted gas boilers for heating and hot water in a built-in storage boiler have several weaknesses:
- High price.
- The boiler is susceptible to failure as calcium deposits accumulate.
The disadvantages are conditional and are often minimized through reasonable operation and proper piping of the boiler. It is mandatory to install a water treatment and filtration system that reduces the appearance of deposits.
In DHW mode, the boiler consumes approximately 30% less gas. Therefore, the cost of purchasing the unit pays off in the first few heating seasons.
Lack or strictly limited amount of hot water - one of the main problems of rest at the dacha or in a village house.
The solution may be an indirect heating boiler. It is not necessary to purchase immediately for this purpose. double-circuit unit. Quite you can get by with single-circuit, but purchase an indirect heating boiler for it.
The latter dispenses the collected hot water when the owner needs to wash dishes or take a bath. It would seem that the problem is solved, but there is another serious obstacle - limited space. In some cases, you need to allocate a special room for such a unit.
Types of gas boilers with indirect heating boiler
Gas devices with an indirect heating boiler may differ according to the type of placement and shape of the tank.
According to the principle of placement: wall and floor
Can be:
Photo 1. Floor-standing gas boiler in a package, with an indirect heating boiler, installed in a special room.
They are installed using special brackets on stable wall, which can withstand the weight of a water tank without loss. It is clear that flimsy plasterboard partitions are not suitable for this purpose. Usually such devices are purchased one small family to your a private house.
Second are capacious water heaters designed on a large number of Human. Such devices will require the installation of a special boiler room.
They are usually purchased by enterprises and owners of large cottages and estates.
According to the shape of the tank
- Horizontal: They are very bulky, but they do not require pumps; they themselves maintain the water in the required volume.
- Vertical: have a small capacity.
When choosing, you should take into account the number of people in the family, as well as layout features and the availability of free space in the country house or in the house.
Photo 2. Gas floor-standing boiler installed in the boiler room, and vertical expansion tank small size.
Double-circuit storage device for heating
Boiler - a tank for heating and storing water desired temperature, which will be issued as needed by the owner. The most simple model: equipped four holes a tank with reinforced and insulated walls, inside of which there is a coil.
The work is carried out according to the following algorithm:
- Supplying hot water from the heating system to the coil.
- Return.
- Admission cold water directly into the tank.
- Discharge of heated liquid from the tank to the tap.
Additionally, the device includes:
Reference! Some models provide for the circulation of heated water from the boiler between the walls of the outer and inner tank. So, you have to wait much less for it to heat up, but also Such a device costs more.
The water heater is connected to heating system right next to the boiler parallel to the main wiring to the appliances. Its own circuit allows you to maintain heating priority in relation to the heating system. Reduces temperature variation on heating storage devices when the heater is turned on.
The temperature sensor detects a decrease in heat in the tank, followed by a command to the circulation pump in the circuit.
Water from the heating system is supplied to the coil, passes through it, giving part of the energy to the still cold water already in the tank.
Once it has heated to the desired level, automation turns off the pump. When the faucet tap is opened, the incoming cold water gradually displaces and dilutes the hot water. Then the cycle repeats.
The cold water inlet is equipped check valve, which prevents it from draining when the pump turns off. The pressure in the tank increases because the faucets are not used constantly, and the water cannot flow back out. Safety valve prevents the pressure from reaching a critical level, releasing a certain volume of liquid into the drain.
Important! The water heater is mounted on flat surface next to the boiler. For hanging models will do log or Brick wall
at the same level as the boiler or slightly higher. Under the floor, they level part of the space on the floor or pre-lay it on it. special ramp
, on which the boiler is installed.
Advantages and disadvantages
To the unconditional pros boilers with indirect heating heaters include saving on electricity.
No gas burner or power source is needed, as with devices direct heating. The heating system will do everything itself, which significantly reduces financial costs.
Other advantages:
- Performance: tank, capacity one hundred liters, gives approximately 400 l hot water at one o'clock.
- Almost instantaneous supply of hot water.
- Possibility of using several energy sources,
for example, a geothermal system.
- Reasonable price.
- Simplicity in the device.
- Warm-up speed even in the newest models it will not be instantaneous.
- Bulky.
Attention! If the family is quite large, then one room will have to be given over to the boiler room, pushing yourself back. Small models will not solve the washing problem.
When choosing a model, you need to pay attention increased attention on the following characteristics:
Features of operation
- Pump filters need to be systematically checked and cleaned.
- Any model implies correct setting thermostat, otherwise the boiler may overheat.
All their pros and cons will become clearer in comparison with similar models in which hot water is “prepared” in a flow-through heat exchanger.
Advantages
- Securing a home hot water regardless of the pressure in the HV main. The peculiarity of double-circuit gas boilers is that their automation, with a sharp decrease in pressure in the circuit, may not switch the unit to DHW mode. This happens during periods of high water consumption. As a rule, in the evening, when housewives cook, wash, and bathe their children. For models with a built-in boiler, all this is not critical - they will provide the house with hot water in any case. Even if the automatic protection circuit shuts off the gas fittings and the boiler stops for a while, hot water will still flow from the boiler.
- When connecting this heating device no additional equipment required, according to insufficiently informed people. By analogy with conventional models, it is connected to two main communications - water supply and industrial/voltage networks.
- Extended service life. This is explained by the fact that traditional double-circuit wall-mounted boilers, when it is necessary to obtain hot water, constantly switch from one mode to another. The result is increased wear of individual components. In this plan heating installations with a boiler they are more durable, that is, their maintenance-free life is somewhat longer.
- Optimal combination indicators such as boiler power and tank capacity for water. Those who choose the option of providing domestic hot water with a single-circuit unit with the connection of a separate boiler, also independently, are most often not satisfied with the result. The reason is the irrational distribution of thermal energy, which is caused precisely wrong selection equipment. In boilers with a built-in boiler, its capacity exactly corresponds to the power of the installation, so there are no problems with heating, increased gas consumption for similar models does not exist.
- The hot water tank protects the extract air circuit from overheating, as it acts as a kind of “buffer” tank, removing part of the thermal energy for preparing hot water.
- The consumption of “blue fuel” of double-circuit boilers with a built-in boiler is somewhat less. But looking into the future, the savings can be quite impressive.
- Lack of inertia of the DHW circuit. hot the water is flowing immediately after opening the tap.
Flaws
To be fair, it is worth noting that not all the disadvantages of wall-mounted boilers with a boiler have great importance in terms of installation and further operation. A serious analysis of the relevant information allows us to conclude that some of them are contrived (usually by competitors), while others are based on a superficial understanding of the essence of the issue. Everyone can assess for themselves how significant the existing shortcomings are, knowing the features of their home and their own capabilities for caring for the air conditioning system. What are the disadvantages of double-circuit boilers with a boiler?
- Built-in reservoir increases dimensions heating installation and its weight. Fair, but only partly, since we're talking about just about an increase of a few cm And kg(depending on model).
- Small boiler volume. This means that such a unit will not fully meet the need for hot water if it is used extensively. Double-circuit boilers wall-mounted with a hot water tank are available in several modifications. The minimum capacity of the boiler is 10 liters, the maximum is 60. For a family of 5 - 6 people, 35 - 40 is quite enough. Any specialist will confirm this, since it is unrealistic, for example, for all household members to take baths at once or to open all the hot water taps at the same time . The already designated “Baxi” boiler is equipped with a 40 liter boiler. As they say, in most cases, “behind the eyes.” In addition, many models have the ability to attach storage boiler(for example, 250, or even 500 liters). Therefore, talk that hot water will flow in literally a matter of minutes is, at a minimum, incorrect.
- Maintenance becomes more difficult heating unit. This is explained by the need to regularly clean the DHW tank. Absolutely fair, if not for a single nuance. In any home there are other devices (except for the boiler heat exchanger) that are somehow connected in their work with water. A prudent owner, so as not to engage in systematic repairs of the same washing machines, dishwashers and so on always thinks through water treatment issues. Depending on the quality of the liquid, various modifications of filters or treatment plants are installed in private homes. So it is completely pointless to say that there will be any special problems with the boiler boiler.
- High price. Significant drawback. But you have to pay for any convenience, and hardly anyone will argue with that.
- The difficulty of choosing an acceptable model and tying it. Undoubtedly. The main difficulty that many experience when assessing the feasibility of purchasing boiler equipment is the definition optimal power installations. The most common recommendation is a proportion of 1 to 10 (kW/m2). But this ratio is average and does not take into account many factors - the features of the structure (wall material, layout), its location on the ground and a number of others. When applied to double-circuit boilers with a boiler, this formula “does not work” at all, since part of the thermal energy is spent on preparing hot water.
In the housing market, private houses and apartments in multi-storey new buildings with autonomous systems heating and water heating for own needs (DHW). For autonomous heating houses use various water heating equipment, but the single-circuit gas boiler is especially popular. And this is thanks to its simplicity and safety.
Advantages
Modern models gas boilers with one circuit for heating the coolant, heating systems could be called primitive water heating devices if they were not equipped with high-precision control and monitoring equipment to ensure the reliability and safety of all operating cycles. To solve the problems of regulation and safety of boilers, it is aimed automatic system boiler protection with gas flow and pressure regulators, fittings that regulate the flow, temperature and pressure of heated water, all kinds of sensors, instruments and safety devices. This is the main advantage of gas boilers.
Other important benefits:
- simplicity of design and installation of the boiler, which includes a combustion chamber with a gas burner, a loop heat exchanger in the firebox, a system of manifolds and pipelines, and pumping equipment;
- efficiency achieved by automation and adjustment work for optimal and efficient combustion of fuel, mixing processes and regulation of coolant parameters in accordance with standards;
- the ability to connect boilers to cascade heating systems within cities and large towns, which allows not only to centrally control the system, but also to ensure reliable and high-quality heat supply to consumers in residential areas, neighborhoods, microdistricts, as well as enterprises whose boiler houses are included in the cascade;
- more environmentally friendly emissions of gas combustion products into the atmosphere compared to similar boiler houses using liquid and solid fuels.
Operating principle
The working circuit of the heating boiler is formed by the following elements:
- its own water heater (heat exchanger), located in the combustion chamber and heated by hot gas combustion products, which enters the furnace through the burner;
- a return pipeline supplying the boiler heat exchanger with cooled coolant (water) from the heating network;
- a direct pipeline of heated water leading from the heat exchanger to the heating system;
- a circulation pump that drives the coolant in a circle.
That's all circuit diagram working cycle of a single-circuit boiler. Make-up (compensation for inevitable water losses) of the heating system of small boiler houses is usually carried out from the city water supply, which has a pressure in its pipelines higher than the pressure in the heating system.
The functional limitations of a single-circuit boiler, expressed in its use only for heating, is a significant disadvantage compared to its double-circuit “brother”.
But if the boiler is combined with an indirect heating boiler and thereby provides the consumer with hot water for domestic needs, then the capabilities of the boilers are equalized.
Subtleties of work
If, when searching for heating equipment for own home or apartment, the choice is made on a single-circuit boiler and it is planned to connect a boiler to it, then need to be taken into account following features operation of the boiler in tandem with this heat exchanger.
- From the moment the boiler is turned on until the water in it is completely heated, the heating system will not work. Based on this problem, it is necessary to choose a hot water supply heat exchanger according to the maximum water heating time, which would be enough to prevent freezing of heating pipes in the extreme frost of the region where you live.
- Choose a boiler based on power, connecting it with the heated area of the premises, not forgetting about the climate zone of residence, what the house is built from and whether its walls have thermal insulation - all this is important when choosing the power of the heating unit.
- Having decided on the power, you can say with accuracy whether such a boiler will handle a boiler water heating system or not.
Heating specialists believe that a boiler installation can only function normally with a boiler with a power of at least 24 kW. Another expert figure is that the boiler takes up to 50% of the power from the boiler. These are the numbers you need to focus on when choosing a gas boiler model for your home. And avoid a situation where a 35 kW boiler is installed with an estimated heating power consumption of 25 kW, and the boiler takes 17 kW. As a result, a boiler power deficit of 7 kW is formed.
It is also worth noting the fact that in some cases a boiler with high performance is required, with a capacity of 200 or even 500 liters.
Such boilers are available with built-in circulation pumps for DHW.
Types
Manufacturers of water heating devices do not skimp on developing cutting-edge models, having correctly taken into account the public interest in autonomous heating and hot water supply devices for private homes that emerged several years ago.
Currently, there are two types of single-circuit heating devices:
Floor-standing options are more powerful, but their placement requires separate rooms in the form of an extension. Wall-mounted water heater – compact, small-sized, installed on the wall. That is why the first of these models became widespread among owners of country and city private houses, dachas and cottages, and wall-mounted boilers found their admirers in urban areas.
Both boilers have a simple and understandable design, attractive appearance, high degree of security. You only need to form your own opinion about which ones are better depending on the tasks they face. Sometimes it is more profitable to purchase a single-circuit wall-mounted unit with less power, but which is enough for a full-fledged heating system at home, and make a simple connection for connection wall structure to a water heater used to heat cold water for your own needs (the water heater can be electric or gas). The hose tying kit can be purchased separately.
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Gas boilers are generators that produce heat to heat indoor air and heat water by burning liquid fuel - gas. A gas boiler with a built-in boiler can only be installed if it can be connected to the main gas pipeline. In the absence of gas supply, it is impossible to use such heating equipment. You can see what gas boilers look like in the photo.
Differences between single and double circuit boilers
A single-circuit gas boiler with a boiler can only heat the room - it does not have a built-in system that is necessary to provide hot water supply. But if you connect a remote boiler with a heat exchanger to it, it will be able to heat water for domestic needs.
Double-circuit boilers have more complex device, accordingly, they cost more. They serve to heat water not only in the heating system, but also in the water supply. In order to increase the amount of heated coolant, you can connect a boiler to such boilers.
Boiler features
Boilers are used to organize the supply of hot water for the needs of consumers through taps. Having such a device in your home, its residents will not depend on the availability of hot water at the tap.
Boilers can use different types energy:
- domestic gas;
- electricity;
- thermal energy, formed during the operation of the boiler.
Regardless of what type of device is chosen by the consumer, its installation must be coordinated with competent organizations and entrusted to specialists so that there are no problems later. It is very important to complete correct connection equipment - in this case, a double-circuit gas boiler with a boiler can be highly efficient and provide hot water, which will be supplied not only to the heating system, but also simultaneously through several taps (read also: " ").
Boiler location in the house
There are gas boilers with a boiler, wall-mounted and floor-mounted. Floor-standing devices are the most common. It is recommended to place them in
utility rooms. They usually weigh less than 100 kilograms and have atmospheric or blast burners.
Wall-mounted boilers are often installed in apartments and small houses. They weigh less than 100 kilograms and are small in size, so they can be hung on the wall. To save space, you can install the boiler in a niche (read: "").
Advantages of double-circuit boilers and their use
Double-circuit boilers are more functional, but also more expensive. Before purchasing, you should decide exactly how the equipment will be used.
Currently, the following models of double-circuit boilers are presented on the market:
- with a flow-through water heat exchanger;
- with a built-in boiler designed for 40-60 liters;
- with a built-in boiler for a volume of 80-500 liters.
The choice of boiler is influenced not only by the price and installation method, but also by the needs of the residents of the house for hot water.
Mounted boilers with a flow-through water heat exchanger have the following features:
- simultaneously heat the premises with total area up to 300 “squares”, and also provide two water points;
- small dimensions allow the equipment to be built into a wall niche;
- low cost;
- simple and inexpensive installation;
- simple controls;
- presence of self-diagnosis elements.
Gas heating boilers with a boiler with a volume of 40-60 liters have a number of advantages:
- capable of heating a house with an area of up to 300 square meters and providing simultaneous water supply to 4 water distribution points at once;
- Ease of Management;
- presence of a self-diagnosis system.
Boilers with a boiler capacity of 80-500 liters come in three types. The first and second of them include devices that are equipped with everything necessary, have small dimensions and allow full control of the system. Boilers of the third type need installation
additional equipment and various components. As a result, you will need to spend a lot of money on the purchase of all the required elements and the work of qualified specialists.
Construction of a gas boiler with a boiler, detailed video:
How to choose a gas boiler
When choosing a gas boiler for your home, you need to pay attention to various
specifications(more details: " "). As for the material, such a device must be made of cast iron or steel. Steel models are more susceptible to corrosion, which is caused by condensation. Their service life usually does not exceed 15 years.
Cast iron boilers They last up to 50 years, but cost much more than steel ones and weigh twice as much (read: " ").
It must be taken into account that floor-standing gas boilers cannot be installed in residential premises - a basement or utility room must be allocated for them. The floor in the room where the boiler will be installed must be made of non-combustible material. Installation wall devices easier to produce. They are small in size and can be placed in wall niches or furniture cabinets. In any case, connecting the boiler to gas boiler must be performed by specialists (read: " ").
Boilers with built-in gas burners do not allow you to independently replace a burner that has failed. Blowing products are purchased separately from the boiler, and if they break down, you can replace them yourself. In addition, devices with this type of burner have more high efficiency. Read also: "".
The main characteristic of boilers is power. If the house is well insulated and the ceiling height is no more than 3 meters, then 1 kW of power is sufficient to heat 10 “squares”. Thus, for a house with an area of 100 square meters, you should purchase a device with a power of 10 kW. If the building does not have good thermal insulation and the ceiling height is more than 3 meters, then the boiler power must be greater. In order to also obtain heated water for domestic needs, you need to choose equipment whose power is 30-50% higher than the recommended one. It is better to entrust the connection of the boiler to a double-circuit boiler to specialists.
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