Overview of wall-mounted double gas boilers: the advantages and disadvantages of equipment, the principles of operation of the instruments, the estimated cost.
Main components:
1- Dymosos;
2- heat exchanger for coolant;
3- low-emissions
Onan gas burner;
4- control panel;
5- Plate heat exchanger DHW
nickname:
1 gas gearbox;
2-burner;
3- heat exchanger;
4- pump;
5 - flow switch;
6- three-way valve;
7- plate heat
Mennik
Connections:
A- from the heating system;
B- in the heating system;
cold water;
G-hot water;
Dzhazh
In the manufacture of kitchen furniture, a place for a double-circuit boiler was provided.
High effect
Native wall-mounted two-circuit gas boilers:
a- 24 CF (Ariston);
B- TheSi (Hermann)
(Buderus)
Nick
nickname:
1 gas gearbox;
2-burner;
3- heat exchanger;
4- pump;
5 - flow switch
Connections:
A- from the heating system;
B- in the heating system;
cold water;
G-hot water;
Dzhazh
1- billmic heat exchanger;
2-control panel;
3-burner;
4- pump;
5- Drying fan
Boyler:
1 gas gearbox;
2-burner;
3- heat exchanger;
4- pump;
5 - flow switch;
6- three-way valve;
7- boiler from plastic or stainless steel
Connections:
A- from the heating system;
B- in the heating system;
cold water;
G-hot water;
Dzhazh
nickname
1- tank by 50l;
2- expansion tank for heating circuit;
3 combustion chamber;
4- burner;
5- Automatic system
nickname and multifunction
ECO Radio System
1-solar collector;
2- membrane tank;
3- Special boiler;
4-boiler;
5- Shower nozzle;
6- radiator
The arrangement of a gas boiler with an outdoor boiler and a boiler for the house with an area of 150-250m2 will cost a round sum. It is cheaper to provide housing with warm and hot water with a wall-mounted two-circuit gas boiler. Let's try to show why.Wall double-circuit gas boilers are very widely used in most European countries and is hardly everywhere - in Korea and Japan for individual heating and hot water supply apartments, country houses and cottages. The maximum heating power of such boilers is usually 24-31 kW (but there are models and 42kWs) - this allows, using one device, satisfy the need for warm-up rooms up to 300-350m2. Well, with a cascade connection of several boilers, it is possible to warm up any sizes.
Cheap and angryOne of the main advantages of wall-mounted double-circuit boiler - complete "combat readiness": appliances are equipped with all equipment necessary in order to provide heating and hot water supply (DHW) of a country house. After easy installation and commissioning, you can enjoy a pleasant warmth for many years.
There are practically all the leading boiler firms, their products are presented in Russia. Similar equipment There are Assortment AEG, Bosch, Buderus, Vaillant, Viessmann, Wolf (All Germany), Chappe, FriSQUET (Voe- France), ARISTON, Wahi, Vertta, Biasi, FDONLI, Fondital, Hermann, Radiant Bruciatori, Sime ( All Italy), Protherm (Slovakia), Demir DKM (Turkey), Termet (Poland), Dakon, Mora, Thermona (all Czech), Rinnai (Korea). It is worth noting a fairly expensive, but superal wall-mounted two-circuit boilers STS (Sweden). Among the products of Russian companies are the attention of Siberia (RostovGazoapp preparation), NGK "Zhuk" ("Zhukovsky Machine-Building Plant"), angels ("Signal") IDR. You can list for a long time. Calculated sales leaders, judging by many experts, is firmly held by Baxi and Vaillant, as well as Ariston, Beretta, Mora, Hermann and Junkers (Germany).
Modern wall-mounted double-circuit boilers are often mounted in the kitchen, in the top row of furniture cabinets, aside from the stove and Moneymaking the same money will have to spend on a double-circuit "wall" turnkey? Prices for boilers of this type fluctuate in the range of 20-115 thousand rubles. Another 2.5-15 thousand rubles. It is necessary to pay a firm with the relevant permits and certificates for the installation of the boiler (the installation cost determines the specialist after inspection of the room, where the unit will be fixed). The chimney problem (even with its absence or complete inefficiency) in a country house often succeeds in solving, Istiving no more than 3-4 thousand rubles. (Tell me further). Commissioning is about 4 thousand rubles; Annual service maintenance and package of documents (act of delimitation of responsibility, copies of licenses and certificates, contract) for gas services will cost 5-6 thousand rubles. Thus, a maximum of 145 thousand rubles. You can ensure year-round supply of a country house with warm and hot water. For comparison: the cost of the boiler room with an outdoor boiler (even with the power of the last 24-30kW) can be 200 thousand- 1 million rubles. and more. As they say, comments are superfluous.
Two sides of the medal
B- Atmotec Pro / Turbotec Pro VUW In addition to low prices, there are other benefits from wall-mounted double-circuit boilers. So, almost all devices are equipped with modulated burners, changing the heating power on the "orders" of the microprocessor (usually in the range of 40-100%, but in some models, for example in Rinnai boilers, - 25- 100%) and regulating the heating temperature of the heat carrier and waters Depending on the needs of the building warm. Wall double-circuit boilers, adapted for operation in Russia, are not afraid of lowering gas pressure to highways up to 13 mbar, and separate models and up to 3-5 mbar. Of course, power with such a gas pressure deficiency is reduced 5-6 times compared with the nominal, but they function stable. Avot for atmospheric burners Outdoor boilers Work under reduced pressure is harmful: the flame "sits" on the burner, it burns and is premature. If the gas only plan to bring to your home, you can reconfigure the wall double-circuit gas boiler on the bridal balloon gas (propane-butane). Automation of "Natureniki" provides autonomous operation of devices throughout the year (you can not even approach the boiler). Well, the security system takes care of the protection of equipment from improper operation and various extreme situations.
There are wall-mounted two-circuit boilers and disadvantages. First, it is smaller than that of the floor, service life (5-15 years). Secondly, the noise level of devices is up to 55DB, and sometimes more, therefore, with a bad sound insulation, the working boiler can be heard not only in the kitchen, where it is customary, but also in other rooms. Thirdly, economic water in their use usually becomes hot only after 9-15 s after the crane opened.
Most models went on sale not so long ago, and the consumer qualities of such equipment can be judged only by indirect indicators. Therefore, choosing the device is recommended primarily taking into account the experience of the manufacturer's company and the presence of a developed network of service centers in Russia. Each boiler must have a certificate of compliance with the State Standard of Russia, permission to use issued by the Gosgortekhnadzor of the Russian Federation, a sanitary and epidemiological conclusion. In short, we will tell about the possibilities of modern wall-mounted double-circuit boilers as heating devices and hot water suppliers, as well as how to choose from a variety of models of the one that is suitable for mounting in a country house.
Heads of heatObviously, the main purpose of modern wall-mounted double-circuit boiler is the heating of premises. These devices are already equipped with built-in elements necessary for the organization of a full-scale boiler room, including one-two circulating pumps, a membrane tank, a system of automation, many different components that guarantee the trouble-free operation of the boiler, IT.P.
Wall double-circuit boilers can be connected directly to the radiator system of home heating. Many models at the same time maintain the temperature of the coolant 30-85s. Unassed FRISQUET boilers Range wider: 20-85c with an accuracy of 0.5s. The power of the wall double-circuit boiler must satisfy the needs of the country house in heat. However, in practice, for any modern cottage, you have to buy a wall-mounted double boiler much greater power than is required to heat the building in order to provide a fairly intense jet of hot water from cranes.
The coolant (a number of manufacturers allow the use of only water) is usually heated in a copper heat exchanger, providing heat transfer from flue gases. It is installed above the combustion chamber of the two-circuit-metal box (approximately 202020cm) from the sheets of aluminized steel with thermal insulation. The injit part of the combustion chamber, on the bottom of the box, is an injection burner.
As soon as the need arises to submit the heat carrier into the heating system, the burner of the boiler on the signal of the electronics is lit. (If a Piezorozhig is provided in the wall-mounted two-circuit boiler, then the start of the boiler after switching on the power supply should be carried out manually. Subsequently, the gas will be ignited from the constantly burning stamp. In the absences in the power supply of a country house in the absence of people, such a boiler itself will not start, which can lead to the exit from Building a cooled heating system. Many modern models of wall-mounted two-circuit boilers are equipped with an electronic ignition system: when restoring the power supply, they automatically turn on with the preservation of the initial settings.) Following the burner, the pump starts to operate, and the water from the heat exchanger circuit arrives in the heating system and radiators. As the water temperature increases in the heating system, gas supply to the burner decreases, which saves gas and increase the efficiency of the boiler. When the water temperature exceeds the predetermined, gas supply to the burner will stop and the boiler will switch to standby mode (before the next heating cycle). For some time, the pump will continue to work for a uniform distribution of heat inside the system to prevent overheating and deterioration of the wall-mounted boiler heat exchanger.
The budget version of the control of the heating system involves connecting to the automation of the two-circuit "wall-line" room regulator, located in the "reference" room (children's or bedroom, without intensive insolation and drafts) and configured to a specific room temperature. At the command of this device, the boiler turns on and off, which is usually accompanied by heat overrun and fairly significant leaps of temperature in rooms. The heat background will change with the intake, as the automation will begin to act only when the temperature in the house, for example, decreases, and this will happen later than the real cooling on the street. If we use a budget regulation, then in order to save energy it is better to install a room regulator in the "reference" room with a programming function (for a day or week). On the regulator you can set the temperature depending on the need for different intervals (for example, on weekends and weekdays, in the evening and day). The cost of the programmable regulator is 1-5 thousand rubles.
There are boilers, the automation of which involves the possibility of regulating the temperature of the coolant depending on the temperature of the street air. The outer sensor is installed on the northern facade of the house, in the sun protected from the sun. Inside one of the heated premises, an additional room regulator is mounted. At once there are two sensors and indoor, and street- allow you to accurately track and quickly adjust the temperature in the house.
Regardless of the method of regulation to increase the comfort of radiators in all rooms (except for the "reference" with room regulator) it is desirable to equip thermostatic valves.
Modern wall-mounted double-circuit boilers allow you to equip in country housing and mixed heating system: radiators + warm floors. There are other options for using them, for example, to heal water in the pool, to supply the heat of the house (let's say, only the garage); As already noted, it is possible a cascade connection of several boilers to increase the total thermal power of IT.P.
How much water flowed ...
How many points of the water selection can provide hot water boiler with a flow heater? Through the stuffing of the kitchen mixer, approximately 5-6l / min, through the impulse watering can of the import mixer - 5-10 l / min. Thus, it is obvious that the boiler with a flow heating simultaneously supplying hot water washing and shower either without any problems will fill one bath (it is necessary that about 12 liters / min of hot water come to the font - then it will not have time to cool). Almost he is not capable.
Water heating for household needs The DHW system starts automatically when the hot water crane is opened on any mixer. At the same time, the principle of priority before heating is available: first hot water for cranes, and then - for batteries. Practice shows that even in the bath days when the boiler warms the water for the DHW 2-3c in a row, "forgotten" about heating, the supercooling of the house does not occur in tall frost. Hot water will flow from the crane all the time until it is open.
In many modern boilers, such as THERM 28 CX, TCX (THERMONA), a coaxial (bitermic) copper heat exchanger is used to prepare hot water. VNM tube for heating water intended for economic needs, passes inside the heating pipe of the coolant, which, in turn heats up from contact with smoke gases. The enemy of most of the flow heaters, in such a heat exchanger, is postponed very slowly. Economic water, pumped through an internal tube of the bittermic heat exchanger, heats up from the coolant, which eliminates its boiling and, therefore, intensive salts deposition. When the hot water crane is closed, the automation includes a circulation pump of the heating system, and it, running the coolant for the external pipe of the heat exchanger, quickly turns it out, which prevents the formation of deposits after the use of DHW.
It is also more likely to heal water use stainless steel plate heat exchangers, such as the Vitopend 100 WH0A model (Viessmann). At the beginning of the waters, the burner and circulation pump of the heating system of the wall double-circuit boiler are included, but the water from the inlet of the primary heat exchanger is directed not to the radiators, but in the plate heat exchanger, providing rapid heating of cold water challenged through it. The method of heating in the plate heat exchanger has one serious disadvantage, which sellers often silent. Cold water flows through narrow slits (1-3mm) between the plates. What is already a gap, the higher the rate of heating, but at the same time the gap fastests the saline sediments. With rigid water, the complete overlap of the gap between the plates can occur after 2-3 months. The main method of protection against deposition is not allowed to overheat water above 60s, and the automation of the boiler should take care of it. There are other ways. For example, in the EURA (HERMANN) boilers, an anti-cellular device was installed on the supply pipe, a permanent magnet preventing the formation of a DHW heat exchanger.
In short conditions, water consumption can sometimes change strongly (it depends on how many points of water intake is currently used). If the mixer with a thermostat is not installed in the bathroom, then with a sharp reduction in water consumption in the case of use of a non-equipped double-circuit boiler, you can get a burn, and with an increase in the cold shower. This problem is solved in the boilers Logomax U022K / U024K (Buderus), Therm 28 Cl (Thermona) IDR. Due to the control of the power of the burner using a special "turbine" in the hot water circuit (the frequency of its rotation depends on the amount of hot water consumed into each specific moment) boilers provide accurate maintenance of the specified water temperature at the output.
Whole seaWall-mounted double-circuit boilers with built-in storage heaters from stainless steel or plastic are somewhat more expensive in operation than their "counterparts" with flow heaters (gas is spent on constant maintenance of a sufficiently high water temperature in the tank), moreover, they require more free space to install the equipment. However, if for the user in the first place is the comfort of the use of DHW, the choice is to stop on them. This, for example, logmax u052t / u054t (Buderus) - 48l tank, New Elite 60 (Ferroli) - 60l, Planet 25-30 / 60 (SIME) - 60l. Interesting model Vitopend 222 (Viessmann) with a 50l boiler. The maximum power for heating the coolant is 24 kW, and to the preparation of hot water is spent to 30 kW.
Water heating in a boiler is often carried out by a spiral tubular heat exchanger immersed in it, in which the need for water heating of water for DHW, water from the heating circuit is directed using a heating circuit with a three-way valve. For the DHW line in wall double-circuit boilers, an additional pump may be provided (model New Elite 60, Ferroli). Data on water temperature is usually displayed on a liquid crystal display made on the front panel of the device.
The capacitance of the boiler, built into modern wall-mounted double-circuit boilers, is usually 45-60l. The user can dispose of this margin at any time and use it with any intensity. Waters are most likely enough to accomplish most of traditional economic work. For rinsing dishes in the kitchen, 5-15l is enough, for washing in the shower cabin of one person - 10-30l. Pauses for heating the next portion of hot water are inevitable only if you have several households and all wash each other. However, waiting for water will not have long: the tank is heated to the desired temperature quite quickly.
What to do if hot water needs more than to prepare a traditional two-kite? First of all, search the device with a more voluminous tank. For example, Hidrocomfort two-circuit boilers (FRISQUET) equipped with 80 and 120 l boilers. At the flow rate of 20 l / min and the water temperature at the inlet 15C and the outlet 40 from the boiler with a tank at 120l will allow you immediately after opening the crane to get 450 liters of hot water, after which, taking a pause of 10 minutes, - another 400l. If this is not enough, it is worth thinking about connecting to the boiler a fairly large external boiler. True, then you will have to purchase a set of reconfiguration and the actual water heater.
It is desirable that your wall-mounted double boiler with a built-in boiler has a function of protection against legionell bacteria, harmful to human health. Boiler (including its lower part) should periodically warm up to a temperature of over 60 C. As a rule, the automation of modern wall-mounted double-circuit boilers, such as New Elite 60 (Ferroli), is configured to the weekly one-time antibacterial "cleaning" boiler.
Where will we put?
The defining condition when choosing a room for a wall-mounted two-circuit boiler or the absence of chimney in it. If the kitchen has chimney, made in the inner wall of the house, and it can be removed in the chimney nozzle of the boiler, it is logical to get a wall-mounted apparatus with an open combustion chamber. Boilers of this type are cheap. The air will go to the burner of such a boiler directly from the room, in which the three-time air exchange and the supply of air on the burning (about 1m3 / h per 1 kW of power) should be organized. For normal operation of the boiler in the exhaust channel, it is necessary to provide a vacation of approximately 4 pa. Chimney, if possible, should be thermally insulated and corrosion-resistant (suggest, with stainless steel insert). The fact is that the exhaust of wall boilers have a relatively low temperature (80-200 s), and condensate can fall on the walls of the chimney (according to the composition it is close to dilute sulfuric acid).
If there is no chimney or it does not provide the required vacuum, it is more profitable to buy a wall boiler with a closed combustion chamber. It is placed in an additional insulating casing of steel, located inside the boiler housing. The air required for burning is supplied to the closed chamber from the street, and combustion products go to the atmosphere. It is possible to use separate channels (with a diameter of 80mm and up to 7-9m each) for air supply to the boiler and to remove flue gases from it outside the room. More often, the closed chamber communicates with the environment by the coaxial chimney (for example, a pipe with a diameter of 60mm in a pipe with a diameter of 100mm IDR). Fresh air is dragged into the chamber along an outer ring channel, and the combustion products leave the inner tube from the building.
From the combustion chamber gases usually removes a smoke fan. The result of its operation in a closed combustion chamber is a vacuum, and air from the street is tightened to the burner. However, there are wall-mounted fan burners (for example, Frisquet), which involves a fan, blowing air from the street into the combustion chamber. The incoming portions of fresh air pushed the flue gases from the chamber into the chimney. This fan is not in contact with the thread of hot gases, due to which its service life increases by 50% or more.
The editors thanks RUSCHLIMAT, BAXI, VAILLANT for the illustrations provided.