The range of wall boilers is wide and varied, so the consumer can easily choose a technically perfect unit. The most efficient and eco-friendly wall condensing boilers include
The range of wall boilers presented in the trading network is wide and diverse, so the consumer can easily choose the technically perfect unit. The battery of the most effective and environmentally friendly includes wall-mounted condensing boilers operating on the main gas fuel and methane.
About the cunning method of calculation
The highest calorific value of the fuel is the entire amount of heat that can be used when burning fuel, including its share contained in the water grid of exhaust gases. The lowest calorific value is the amount of heat excluding energy, hidden in a pair of outgoing gases. To show your goods in a favorable light, the sellers of the heating equipment almost always indicate the efficiency of the heat generator, calculated according to the method using the lower calorific value of the fuel. However, the buyer does not inform about it. Vitoga instead of the efficiency of 80-85%, the real for the traditional heat generator, an indicator of 92-95% appears, and the efficiency of the condensing instead of 93-96% is at the level of 107-109%, which contradicts the law of energy conservation. This fact causes a certain skepticism in consumers unfamiliar with the Aza heat engineering. But afraid of ultra-high efficiency of the condensing boiler, it is still not worth the costs of the existing method of calculation.
Benefits of construction
Traditional wall boilers utilize the heat released when burning gas, using a convection heat exchanger (in fact, this tube on which numerous copper plates are planned). Methane combustion products heat this unit, and it transmits the heating system obtained heat carrier. The thrust necessary to maintain combustion in ordinary wall-mounted boilers provides a vacuum resulting in gravitational chimney; The average temperature of the combustion products, removed to the atmosphere, at the outlet of the boiler is 120C. Cooling outgoing gases to a lower temperature. Traditional boilers due to the characteristics of their design are not capable. Of course, you can install a more efficient heat exchanger in the positive. But if the exhaust temperature decreases, condensate containing acid will appear on its plates and in the chimney, because of which the elements of the boiler will come into disrepair. Therefore, it is necessary to spend the energy "on the heating of the street" - it is better than one by one to change the heat generators spoiled by condensate.
Where does condensate come from? When combustion of natural gas (like any other hydrocarbon fuel), a chemical reaction occurs, and the result is formed water, in the fire instantly turning into steam. It is the pair that contains up to 11% of the energy of the burned methane. Purpose condensation kotla- use this energy by reducing the flue gas temperature to the dew point (for combustion of gas is about 57C), at which steam starts to condense, will be released thermal energy spent on formation of steam (water vapor) and heat previously "Fucked in the pipe" can be applied, for example, to heat the coolant.
De Dietrich. | 
De Dietrich. | 
Vaillant. | 
Viessmann. |
1. Innovens (de Dietrich) wallpapers will ensure the optimal level of comfort when heating and cooking hot water.
2. MCRs with a capacity of 6.3-39kWs operate on natural gas or propane. For hot water supply, boilers are equipped with flow heat exchangers, allowing hot water immediately after gas igniting, or connect to boiler. The capacity of 80l is mounted next to the boiler, at 130l, under it.
3. Ecotec Plus (Vaillant) accommodation boilers are very economical and do not pollute the environment.
4. Available condensation boiler Vitodens 200-W (Viessmann) is set to a row with mounted kitchen cabinets.
What is the difference between condensation boilers from traditional design devices? The first has a special heat exchanger made of acid-resistant materials (stainless steel, silhum IT.P.). It has an outer surface of a large area in contact with the smoke gases, which, by the way, can be self-charged with fluctuations in the temperature of the coolant, like the ComfortLine model (Wolf, Germany). A similar heat exchanger is capable of working as in low-temperature mode (the temperature of the water returned to the boiler is about 30c, and the output - 40-50c) and in the usual, high-temperature mode (70-90c). True, in the latter case, condensation in the heat exchanger will not begin, and the efficiency of the boiler will be almost the same as traditional wall gas. In addition, in condensation boilers use a special modulating fan burner. It can produce from 8-20 to 100% of the nominal thermal power (depending on the model), adapting the heat output of the boiler to the needs of the house. Moreover, the problems with gas supply, characteristic of the Russian depth, the burners of condensation, are not terrible - they work and with a decrease in gas pressure at the entrance to the house to 5 MBAR, insignificantly losing in power. Condensate burner does not destroy.
The modern wall condensation boiler (both the same and double) is functionally superior to every single wall gas apparatus of traditional design. The power of wall condensing ranges in the range of 5-125kW. This means that with the help of only one unit will be able to warm up a fairly large house. If the need for dwellings in heat exceeds 120kW, condensation boilers, if desired, are combined into a cascade, which allows you to satisfy the appetites of any private country house. For example, RENDAMAX condensation boilers (Netherlands) can be equipped with a cascade control device, which includes up to eight devices.
Hot water The condensing boiler produces in significant quantities. So, a single condensing can always be connected to the remote boiler. For example, ProCon (MHG, Germany) is able to work with an external boiler of up to 500l. With a small consumption of water (let's say, the mixer in the kitchen and shower in the bathroom) is not bad to buy a double-circuit condensing boiler that heats the water using the plastic heat exchanger built into it. This may be, for example, a double-circuit ComfortLine (Wolf). Very compact and productive models with built-in mini boiler. Vitodens 333-F pc (type WS3C, Viessmann, Germany) for HBS provided a built-in tank water heater with a capacity of 86l.
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Wolf. | 
Vaillant. | 
Biasi. |
5. The Effective Wall Condensation Boiler Vitodens 200-W (Viessmann) is installed in the kitchen of the country house. The device heats the heat carrier for heating and water for the DHW system.
6-7. CGB-K-24 COMFORT-LINE (WOLF) CGB-K-24 (WOLF) (6) and Calormatic 330 remote control (Vaillant) (7).
8.Anted condensation boilers Biasi to enhance power can be combined into a cascade. Installation of equipment will significantly simplify special metal cabinets.
Is it worth the game of the candle?
On average, due to the difference in the efficiency, a good condensing spends on the production of 1kW heat for the needs of gas heating by 15% less than the wall cauldron of the traditional design. For example, on the heating of the house with an area of 200m2, a traditional 24kW power boiler for heating season spends 6 thousand m3 gas, and a condensation similar power is 5100m3. Then, if the price is 1000m3 gas 3690 rubles. (It is so much now the main natural gas for the owners of the villages near Moscow), for the specified period, the owner of condensing equipment will save approximately 3321 rubles. For 10 years this amount will increase to 33 210 thousand rubles., Otherwise, and more, since the prices for natural gas for the population are growing, and recently a fairly rapid pace.
Options for performing chimney
from condensation boilers
However, it is assumed that gas prices in Russia remain unchanged (which is unlikely), the economic feasibility of buying a condensation boiler can be questioned. After all, for example, a condensing with a power of 24kW is more expensive than the traditional heat generator of the same power, just for the same 30-35 thousand rubles, which will be saved on fuel and completely return to the owner of the boiler only after 10 years of its operation. In addition, although this equipment has an increased resource (which, by the way, partially compensates for the high cost of condensation), it still requires regular and non-cheap maintenance.
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Viessmann. | 
Photo V. Balashova | 
Photo V. Balashova |
9. The modern condensation boilers usually have very compact dimensions, low weight, comes assembled. All this greatly simplifies their installation and allows you to enter equipment to any interior. High-quality condensation equipment works with a sufficiently low noise level even in maximum power mode.
10. The Vitodens 300-W (VIESSMANN) condense boiler is equipped with a SELF Monitoring and Reporting Technology (SELF Monitoring and Reporting Technology), a timely revealing problem in the operation of the heat generator and reports this to the user.
11-12. BWC 42 (Bosch) (11) and Logamax Plus GB 162 (Buderus) (12) are equipped with multifunctional control systems, it is extremely simple in the setting and easy to maintain.
Nevertheless, condensation boilers should give preference primarily because they are environmentally friendly. Since emissions into the atmosphere of condensing are environmentally friendly (in comparison with the products of combustion of traditional aggregates), this technique can be placed in residential buildings, without building high chimneys. Due to the preliminary mixing of fuel and air, as well as lowering the temperature of the exhaust gases, it is possible to suppress the formation of nitrogen oxides NOx and reduce the content of CO (carbon monoxide), since the latter is oxidized to less hazardous CO2 dioxide (carbon dioxide). The same condensate catches a significant part of harmful substances, so the volume of harmful emissions into the atmosphere is sharply reduced. For example, the content of nitrogen and carbon monoxide oxides in Baxi condensation (Italy) compared to conventional wall gas boilers is reduced by 80 and 90%, respectively.
There is another important advantage of a condensation boiler before the traditional one is adapted to low-temperature heating systems (more comfortable than ordinary, high-temperature). Htuki systems use high-sized heating devices. Their set will cost the house owner by 20-50% more expensive than when creating a high-temperature heating system (for a 150m2-10-20 thousand housing area.). But but the radiators of low-temperature systems are heated only to 40-45c, therefore, even touching them for a long time, you will not get burns. Longwave IR radiation from the surfaces of radiators, pipes and other components of the low-temperature heating system is most favorable for humans. Yes, and in the rooms there is almost no drafts, since large moderately warm radiators under the windows are more effectively struggling with descending flows of cold air than small, but heated to high temperatures radiators of traditional heating systems. Condensing are perfectly adapted to work with warm floors.
Photo V. Balashova | 
Photo V. Balashova | 
Photo V. Balashova | 
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13.The Logamax Plus GB 162 (Buderus) is equipped with heat-capacity up to 100kW, the high efficiency of which is due to its large heat exchange surface.
14. The ceramical burner of the GB 162 boiler allows you to change its power from 18 to 100%.
15. The Giegastar (Giersch) series of stainless steel series used in the upper zone of the corrosive heat exchanger made from aluminum alloy with a high silica (11%) used in the upper area of the Giegastar (Giersch) series.
16.Shem the work of the MCR boiler (de dietrich).
Process costs
Unfortunately, the condensation boiler "issues on-mountain" a significant amount of condensate. Of course, during the operation of an ordinary boiler in chimney, it is sometimes quite a lot of this fluid, especially in frosty weather, but these volumes are incomparable with the "productivity" of the condensing. Thus, the condensation boiler with a capacity of 25kvt gives up to 3.5 liters of condensate, almost two buckets will be checked for him, and for the year (with continuous operation) - up to 7 thousand. In fact, condensate is a weak solution of coal and sulfuric acids in water. Its hydrogen indicator of the pH depends on the type of fuel, the design of the heat exchanger, the excess air coefficient, the end temperature of the condensate and when using the main gas is 4-6.
The question arises: where to merge condensate? After all, it is impossible to divert it into a stream near the house, on the ground or in the sew channel on the border of the site (thereby you worsen the environmental situation and in its territory, and the neighbors). If the sewage system is based on a biological treatment station, the acidic solution is undesirable or even unacceptable in the pipes (the colony of bacteria that ensures wastewater treatment may die). So, for many high-tech models of sewage treatment plants intended for a country house, the required pH value of the effluent is at least 6.5.
However, there is very effective and inexpensive equipment, which allows to prepare condensate to the utilization by traditional ways. So, before draining to the house sewage sewage, condensate must be deoxidated in the neutralizer. The latter, as a rule, is mounted next to the wall condensing boiler (on the floor or wall). The neutralizer is usually a small container, at the input to which a filter is installed, cleaning condensate from solid particles. Finding into the neutralizer, condensate gradually seeps through the fill in its hiding from the granules containing alkali, or marble crumb and at the outlet is quite safe for any septicity liquid with PH6.5-9.
The magnitude of the pH of the deoxidized condensate should be systematically monitored (at least 1, instext). To do this, you can use the indication strip from the set of delivery of the neutralizer or PH-meter. We will have to regularly plug the granules into the neutralizer or (if the instruction manual requires) to fully change the backbone of 1 times in 6-12 months. Examples of neutralizers - NeutraBox Geno I-25 (Grunbeck, Germany), NS33 (De Dietrich, France). The price of the neutralizer for the condensation boiler with a power of 25kvt (included in the package, as a rule, the deoxidizing granules per snowpad) is about 10-19 thousand rubles. An additional package with granules (5kg) costs about 1-1.5 thousand rubles.
Started sewer (if several dozen houses are connected to it) condensate can be merged without neutralization if the boiler power does not exceed 200kW. After all, household waste, including from washing and dishwashers, often have a weakly pronounced alkaline composition (pH7,2-7,8). Therefore, condensate is neutralized directly in sewage, due to the contact of alkaline and acidic media. However, in this case, it may be necessary to establish a deoxidizing device, for example, if the pipes and sealing seals are made of a material that cannot withstand long-term contact with a weak solution of acids, or if the condensate is not mixed in sufficient proportion with household sewer water (at least 1:25).
Viessmann. | 
Biasi. | 
Biasi. | 
Wolf. |
17. The "heart" of the wall condensation heat generator Vitodens 200-W is the spherical burner of Matrix stainless steel, which allows to significantly reduce the emission of harmful substances into the atmosphere.
18-19.The device (18) and cylindrical burner (19) of condensation wall mounted boilers Biasi are made of acid-resistant durable materials.
20. Condense wall gas boilers CGB-K-24 (WOLF) are equipped with a heat exchanger of DHW from stainless steel. These heat generators are designed for heating and cooking hot water in flow-through mode. If with the time of the need for a country house in warm water, a boiler can be connected to the boiler, for example CSW-120.
I am a single circumstance. If the boiler is located in the basement or the ground floor of the house, below the entrance to the sewer collector, the condensate will not fall in sewage into the sewer. You will have to install a tank with a float valve, which, as the vessel fills it with a pump, or a special sewer installation, such as Conlift (Grundfos, Denmark, about 6.2 thousand rubles) to automatically delete condensate into the sewage system.
It is very important to choose the correct chimney for the condensation boiler. The design of the latter is such that combustion products are discharged forcibly. This makes it possible to connect the boiler to the coaxial chimney, as well as to the nozzle for the air intake from the street or out of the room and remove the products of combustion through the smoke tube. The temperature load on the chimney of the condensation boiler is small (by the time of admission to the chimney, the exhaust gases are cooled to 40-60C). But condensation often continues in chimney, so it should be sealed and sustainable to acids. The brick channel definitely does not suit the acid to destroy it for several operations. Avtot chimneys, such as Vaillant, Raab (both Germany), made of polymeric materials, will serve longer. As a rule, chimneys are manufactured from PPP, PPS or PVDF- plastic. To assemble the chimney, direct cuts of pipes with a length of 0.5-2m (RR pipe with a diameter of 80mm costs approximately 800-2500 rubles. For 1 m) and a variety of shaped elements. However, there are chimneys based on a flexible corrugated pipe from a PP polymer, which can easily "stretch" inside the old brick chimneys, including with an uneven inner surface. They offer, say, IMmergas (Italy). Copdation boilers "Friend" and traditional stainless steel chimneys (AISI 304, AISI 409, AISI 430).
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Photo V. Balashova | 
Photo V. Balashova | 
Photo V. Balashova |
21. The date of condensate in the village sewage system. When removing condensate from a wall condensation boiler to urban or large village sewage sewers, you can not use the device for its neutralization. Normalization The pH will occur as a result of mixing condensate with wastewater.
22. Granules of frustration in the condensate neutralizer.
23. NEutraBox I-25 network.
24. Installation Conlift (Grundfos) with a built-in check valve for automatic condensate removal (pressure- 5.3m).
What does the market offer?
Currently, condensing boilers produce almost all leading boilers. Can be noted ACV products (Belgium): Prestige series; ARISTON: GENUS PREMIUM; Beretta: EXCLUSIVE GREEN and POWER PLUS (OBTALY); Baxi: Prime HT, Luna HT, Luna HT Residential and Nuvola HT. De Dietrich produces a very good technique: Innovenc, MCR. Let's call immergas: victrix; Ferroli: Energy Top, Econcept; SIME: Format Dewy.zip and Planet Dewy (All Italy); PROTHERM (Slovakia): Lion series; Thermona (Czech Republic): kd, kdc, kdz with a nominal power of 28kvt, as well as a condensation boiler Therm 45 kd with a nominal power of 45kw with a combustion chamber from heat-resistant plastic. One of the legislators of fashion for condensation technique is RENDAMAX (in Russia are popular, for example, the boilers of the R30 series). Finally, the condensationists are excellent for the quality and heat engineering characteristics supply German Buderus boilers (Logamax Plus of three-order: GB022, GB112, GB162), Junkers (CERAPUR), MHG (ProCon Streamline), Vaillant (Ecotec Plus), Viessmann (Vitodens 200 -W, 300-W and 333-F), Wolf (Comfortline). The estimated cost of a household wall condensation boiler can be defined by multiplied by the value of its nominal power per 3 thousand rubles.
The editors thanks Biasi, Buderus, De Dietrich, Vaillant, Viessmann for help preparing material.