The chimney is one of the most important parts in the design of a boiler room based on any boilers that burn fuel, including condensing ones. Proper design, material selection and high-quality installation chimney - the necessary conditions long and efficient operation boiler room as a whole.
The main feature of flue gases from condensing boilers is their low temperature compared to flue gases from traditional boilers. In turn, low temperature leads to the obligatory formation of a certain amount of condensate in the chimney. It is these two factors - low temperature and condensation - that are decisive when choosing a chimney material for condensing boiler. In addition, the need to ensure constant removal of condensed moisture must be taken into account in the design and geometry of chimneys.
Against the background of the above, we will analyze three main aspects regarding chimneys for condensing boilers:
- Materials used;
- Design features;
- Basic installation diagrams.
Materials for the manufacture of chimneys for condensing boilers
The two most common materials used to make chimneys for condensing boilers are fire-resistant polypropylene and stainless steel.
Flame retardant polypropylene (PPs)
IN household use PPs chimneys are the most affordable and convenient in terms of installation. Generally speaking, polypropylene chimneys are also used with traditional boilers most modern designs, but still the service life in this case is limited due to the relatively high temperature of the flue gases.
In the case of condensing boilers, the exhaust temperature is low enough to have no effect on the strength of the chimneys. In addition, polypropylene is inert to the acidic composition of the condensate formed during the combustion of hydrocarbon fuels. That is, from the point of view of durability, this material is ideal for use with condensing boilers.
Another feature of chimneys for condensing boilers is the requirement for operation under excess pressure. That is, the connections of the elements must be sealed. Typically, silicone seals are used to provide a seal. Polypropylene is convenient here because, due to its elasticity, it does not require the use of additional clamps, unlike of stainless steel.
The main disadvantage of this material is its vulnerability to ultraviolet radiation, that is, such chimneys cannot be laid outdoors in the open.
It is also important to note that polypropylene must be fire resistant. This fact is usually indicated by the letter “s” in the material designation (PPs). This type of polypropylene is more resistant to high temperatures and, no less important from a safety point of view, does not support combustion.
In past years, it was a fairly common mistake to use sewer pipes for chimney installation. pressure pipes from ordinary polypropylene in order to reduce the cost of the material. This should not be done under any circumstances for the reasons stated above.
Stainless steel
Acid-resistant grades of stainless steel are the second most popular material for condensing boiler chimneys in domestic use, and the main one in the industrial and commercial segment!
The basic requirements are still the same: operation under excess pressure and resistance to chemical composition condensate In terms of temperature, stainless steel provides a huge margin of safety.
Types of chimneys
There are three main structural types of chimneys, each of which has a specific area of application:
- single wall;
- double-walled (sandwich);
- coaxial.
Single wall chimney
From the name it is clear that these are simply pipes and shaped elements made of the appropriate material. Can only be used indoors or in thermally insulated ducts (for example chimneys during reconstruction). Typically used for the emission of flue gases when air is taken from the boiler room.
It is often also used to make a channel for supplying combustion air from the street. These air ducts, of course, do not have any special requirements for temperature and chemical resistance and tightness. That is, they can be made from almost any available material. However, from the point of view of uniformity and ease of installation, the same type of single-wall chimney is usually used as for the exhaust of flue gases.
Single-wall chimneys can under no circumstances be used outdoors. The main problem is the constant formation of condensation in the channel. From the point of view of chemical resistance, as noted above, this is not terrible, but there is a great danger of freezing of the liquid inside the chimney and, as a result, a narrowing of the pipe’s flow area. The drop in natural draft due to cooling of flue gases for this type of boiler is not critical, since they are equipped with powerful fans, providing a high value of residual pressure.
Double wall chimney (sandwich)
Elements of this type of chimney consist of two concentric pipes various diameters, the space between which is filled with heat-insulating material, usually stone wool non-flammable.
There are no special requirements for the outer pipe in terms of acid and heat resistance; only resistance to atmospheric conditions (precipitation, ultraviolet) and mechanical strength. Therefore, in the case of double-walled stainless steel chimneys, the inner and outer pipes are usually made of different grades of steel to optimize cost. There are options with execution outer pipe made of aluminum.
Double-walled chimneys can be used both indoors and outdoors.
Due to the low temperature of the flue gases and the absence of the risk of burns, in the case of condensing boilers, the double-walled version is usually used only for the outer part of the chimney, and for the inner part a regular single-walled pipe can be used.
Coaxial chimney
Again, based on the name, it is clear what this chimney is: two concentric pipes with empty space between them.
The main feature of this type is that it is used both for the emission of flue gases (through the internal pipe) and for the intake of combustion air (through the space between the pipes). Accordingly, when using it, it is not necessary to constantly ensure the supply of combustion air to the boiler room. In addition, the incoming air is heated from flue gases, thereby increasing the overall efficiency of the boiler room.
Laying coaxial chimneys is also only allowed indoors; the length of the external section in our conditions should be no more than one meter. A common problem in conditions cold winter is the freezing of ice at the end of the chimney. This happens due to the sharp cooling of the flue gases at the outlet upon contact with cold air entering the combustion through the gap between the pipes. To solve this problem, you can trim a section of the external pipe in the area where the chimney ends in order to separate the exhaust of flue gases from the air intake; or use the factory winter options for ending the coaxial pipe.
This type of chimney is made from both plastic and stainless steel.
Basic installation diagrams for chimneys for condensing boilers
All chimney schemes for condensing boilers are divided into two main types: with combustion air intake from the room and from the street. Naturally, domestic regulatory documentation describes these types of smoke removal and the requirements for them, but in the documentation for boilers, names are usually found in accordance with European standards. A chimney with air intake from the boiler room is designated as “Bxx”, from the street - as “Cxx”. The first index varies depending on the specific circuit, the second - on the location of the fan relative to the boiler heat exchanger. In all modern condensing boilers, the fan is located in front of the heat exchanger, which is indicated by the index “3”. Below are the basic diagrams using the example of wall-mounted boilers:
For domestic power, chimney calculations are usually not necessary; it is enough to follow the boiler manufacturer’s recommendations for maximum length taking into account shaped elements (elbows, tees, etc.). In the case of industrial boiler houses, a smoke exhaust calculation is required; you can contact the chimney manufacturer for this.
Combustion air intake from the room
| The simplest way to organize the removal of flue gases. Almost always used for high-power boiler houses: industrial or commercial, when floor-standing boilers are used. It is also often found in household use. Two main requirements when using such schemes: ensuring the necessary air flow into the boiler room and its cleanliness. For large-capacity boiler houses this is usually not a problem, since these points are carefully taken into account at the design stage. In private boiler houses, a situation often occurs when sufficient air flow is not provided; or it is carried out through adjacent rooms, where finishing work continues after the boiler is started, which contributes to the presence of fine dust in the air and clogging of the internal elements of the boiler. Naturally, this state of affairs should be avoided or special air filters should be used on boilers. |
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In this case, the chimney must be installed above the roof level and out of the so-called “wind surge” zone.
This is necessary in order to eliminate the influence of air pressure fluctuations on the smoke removal process.
Combustion air intake from the street
In this case, two main subtypes of chimney are used: coaxial and separate.
Coaxial chimney
As mentioned above, it is widespread mainly in household use with wall-mounted boilers. In a private house coaxial chimney It is especially convenient in that it is quite easy to place it horizontally behind the wall, without constructing a vertical trunk extending beyond the roof level. This is possible due to the fact that the air intake and smoke emission areas are located nearby in the same pressure zone, and are thus not exposed to wind.
However, the issue of flue gas dispersion into the atmosphere remains. The emissions of modern condensing boilers are environmentally friendly, but the chimney must comply with standards for distances to windows, doors, ventilation grilles and neighboring land plots. In order to combine the convenience of installing a coaxial chimney indoors and using a double-walled pipe outdoors, you can use special transition kits.
In case of modernization of an existing boiler house with brick chimneys there is an option with coaxial pipe to the area of this chimney. Next, it is laid inside it new pipe made of stainless steel (single-walled can be used). Air intake is carried out through the gap between steel pipe and a brick chimney.
The most diverse option for organizing a chimney in terms of design options. However, it is rare in private construction and industrial boiler houses. Since for condensing boilers in the first case it is usually easier to use a coaxial chimney, in the second case it is easier to take air from the room.
Often found in apartment buildings with separate heat generators for each apartment, according to the following scheme: 
Regarding the selection and purchase of a chimney for a condensing boiler, please contact our
.
Must be made of materials with increased resistance to acid corrosion. It’s one thing when hot combustion products pass through a pipe, and quite another thing when condensation, a concentrated acid with a pH of 3 to 5, forms in it.
2. The chimney must provide free drainage of condensate into a special tank
This tank (boiler) must be equipped with a siphon seal filled with water to prevent flue gases from entering the drain pipe.
Insulated. Photo: Navien
3. It is necessary to provide for forced traction
The temperature of the flue gases is low (approximately 55 C), three times lower than the flue gases from a conventional boiler (180 C). Because of this, the natural draft of the chimney is usually not enough, so forced draft is used. The boiler fan helps remove flue gases from the boiler.
4. The chimney must be sealed
Due to forced draft, the chimney must be sealed along its entire length (for example, lip seals are used). Otherwise, some of the flue gases will enter the room.
Coaxial. Photo: Protherm
5. Constant air flow is required
For normal operation of a condensing boiler, it is necessary to organize a constant flow of air to it. This can be done in several ways, for example, by taking air from the room if there is a sufficient supply of it. If supply air is not enough, the air flow is organized through the same chimney, which for this purpose is usually made in the form of a concentric pipeline (coaxial chimney). Street air flows inside through the inner pipe, and flue gases are discharged through the outer pipe.
Compact boiler with coaxial chimney. Photo: Boris Bezel
6. It is necessary to correctly determine the length of the chimney
The length of the chimney cannot be arbitrarily large; it is determined by the fan power of a particular boiler model. It is different for each condensing boiler model and is indicated in the technical specifications of the product. For example, the De Dietrich VIVADENS MCR-P 24 model is recommended to be connected to a coaxial chimney with a horizontal ending and with an air duct diameter of 60 mm and for flue gases of 100 m. And the length of this chimney should not exceed 6 m if it has a horizontal ending (outlet a piece of pipe extends horizontally through the wall of the house) or 20 m if the coaxial chimney has a strictly vertical design.
The editors would like to thank De Dietrich for their assistance in preparing the material.
It should be your desire to follow the latest advances in design when installing a condensing gas heating boiler. The point is that ordinary gas boilers, without which no serious system is unthinkable autonomous heating country house, do not fully utilize the full potential of an energy source such as gas. That's why even best models gas heating boilers have an efficiency of no higher than 80%. Some of the energy has to be removed outside and simply thrown out through the collector.
Devices beyond school physics postulates
But there is an opportunity to squeeze additional dividends out of gas in the form of kilocalories of energy.
The essence of the process
The idea lies in the following postulates:
- gas is a non-uniform heat source, it also contains water vapor;
- turns out, When we burn gas, we emit not only combustion products, but also this very steam;
- and an idea arises - why not condense this steam and the resulting hot water also do not use to heat the coolant in the heating system.
And so it was done - the newest gas heating boilers condensation type. Boilers are gaining popularity so widely that, according to statistics, more than 30% of all gas boilers in Germany are compensation ones.
Born at a time when increased demands from a design point of view began to be placed on products created in the world, condensing boilers are developed with an emphasis on this characteristic - they all look terribly attractive.
Well, what is hidden inside, thanks to this “double purification” of the gas, allows us to achieve a real calculated efficiency of 105 to 110%. In other words, condensing boilers, in essence, are double-circuit boilers.
Helpful advice! Unfortunately, we cannot say that the boilers we represent are as widespread as in Germany. Therefore, if you decide to install such a boiler, first of all choose a worthy model, and most importantly, a worthy supplier and adjuster of the purchased boiler. Frankly speaking, the vast majority of companies have neither experience working with such boilers nor the appropriate personnel for its further maintenance.
Advantages of condensing boilers
The advantages include the following:
- they have the highest efficiency of all possible devices for a similar purpose - which means you have the opportunity to reduce gas consumption with the same calories of energy generated; according to statistics, gas consumption in condensing boilers is 15-20% less than in conventional boilers;
- a much larger range of adjustment of the coolant temperature - such adjustment is possible on all boilers, but those operating with gas and “associated” steam have a maximum range from 30 to 85 degrees (by the way, such a maximum, as a rule, is not necessary to supply to the system, the usual coolant temperature in heating systems does not exceed 40 degrees);
- smaller output harmful substances in atmosphere - gas mixture burns to a much larger volume;
- innovative technology stimulates both designers and technologists - all condensing boilers are manufactured using the most advanced technologies, which provides them with a much longer service life under the same loads.
Among the shortcomings
But we must be aware that such boilers also have some disadvantages, more of an everyday kind:
- the most important thing is that they cost at least twice as much as conventional gas boilers; and this is today the main obstacle to their mass use;
- secondly, such units are very picky about the material from which the chimney is made - it is necessary to use only high-quality plastic and ceramics;
- thirdly, it requires a special calculation of the heating system for lower internal temperatures (not higher than 70 degrees) - this requirement already puts forward the need for steam condensation inside;
- fourthly, a special water pipeline is required to discharge outside, usually into the sewer, the water accumulated inside (usually no more than 30 liters per day at permanent job boiler); here it should be noted that in Germany, for example, there are restrictions on the discharge of such water into the general sewer system;
- fifthly, it requires experienced personnel to install and maintain them.
Despite the fact that these boilers were initially designed as double-circuit, there are also single-circuit models. But most importantly, several modifications of condensing boilers have been developed depending on the location of their installation.
There are modifications:
- floor– the most powerful and widespread; the power of such boilers can be 100-120 kW;
- - very elegant-looking devices with a power of 30-40 kW, which is often more than enough.
Helpful advice! If you decide to purchase a gas condensing boiler for industrial use, most likely you will need to choose a model of direct, or they also say, “wet” effect on the coolant flow. The efficiency of such boilers is even higher, but their use is still limited to a small supply market. At home, boilers that have an indirect, or “dry” effect on the coolant, without contact with it, are widely used.
On the crest of a wave
You are unlikely to succeed with your own hands. This is too important technology, serving too important tasks. Even though you will have installation and operating instructions at your disposal, even though you will view all the photo and video materials on our website, you will still have to seek detailed advice from professionals.
But to understand the algorithm of operation of condensing boilers and select the necessary one, according to power and appearance, this is already for you. In any case, take your choice very responsibly, the price of a mistake is quite high and is expressed not only in the quality of heating of your home, in considerable lost financial resources, but also in discrediting such an important thing as the introduction into our lives of the most advanced achievements of designers and designers .
It is the main element of the chimney system. Used on straight sections to achieve the required height.
There are three types of length sizes - 250, 500, 1000 mm. , which makes it possible to select elements in accordance with the design configuration. Chimneys of the “Sandwich” type consist of an internal welded pipe (various steel grades (AISI 430, 304, 321) different thicknesses and an outer pipe of larger diameter made of matte or polished (mirror) AISI 430 stainless steel 0.5 mm thick or galvanized steel. A layer of insulation is laid between the pipes - non-flammable insulating material based on basalt rocks.
Throttle valve
This is a chimney element used to regulate draft by partially blocking the smoke channel, and also as a damper on an unused fireplace with an open firebox to prevent outflow warm air from the room through the chimney.
It is a pipe with a built-in butterfly valve and an outward handle.
Mono-thermo transition
This is a chimney element used when connecting chimney systems various types or if necessary, change the diameter of the smoke channel.
The transition is installed at the junction of parts of the chimney system with different diameters. As a rule, when moving from a smaller diameter to a larger one, in situations where several heat generators are connected to the main chimney channel at different levels
The outlet is the main element of the chimney system, allowing you to change the direction chimney in cases where it is necessary to bypass an obstacle, or turn the chimney in the desired direction. Bends are made from cylindrical sectors connected at a certain angle.
Tee 90°
Tee 90 consists of two cylindrical elements connected at an angle by spot or seam welding.
When installing a tee at the turn of the chimney from a horizontal or inclined position to a vertical one, a plug or condensate drain plug is installed at the bottom of the tee that closes the entire system.
It is preferable to use a 90° tee in dry mode, since when the flow of gases slows down during a sharp turn, active condensation may occur.
Tee 45°
A 45° tee consists of two cylindrical elements connected at an angle using spot or seam welding.
When installing a tee at the turn of the chimney from a horizontal or inclined position to a vertical one, a plug or condensate drain plug is installed at the bottom of the tee that closes the entire system.
The 45° tee provides Better conditions traction than a 90° tee, since it has a larger angle (135°) of rotation.
This is a chimney inspection element designed to diagnose the condition of the smoke channel and clean the chimney by removing products of incomplete combustion of fuel (soot). The inspection makes chimney maintenance easier.
As a rule, the inspection is installed at the base of the chimney, below the connecting tee, as well as on horizontal sections of the connecting chimney more than 2 meters long.
The revision is a modification of a 90° tee equipped with a special cover secured with pipe clamp. The revision consists of two cylindrical elements connected at right angles.
Stub
It is installed at the bottom of the tee to collect soot and condensation, and can also be removed to remove foreign objects from the chimney.
Plug with condensate drain
Designed to collect and remove condensate products from the smoke duct. Consists of a pipe element, a conical element or a tray with a hole, connected to each other. The hole is designed to drain condensate and is equipped with a pipe.
Conical end
If elements are not installed at the mouth of the chimney special purpose, a conical end should be installed to protect the insulation from precipitation.
Thanks to the closure inner tube and the upper edge of the truncated cone blocks the access of precipitation to the insulation.
Used as the end of a chimney to protect it from precipitation.
Thermo-thermo transition
These are chimney elements used when connecting chimney systems of various types or when it is necessary to change the diameter of the smoke duct.
Transitions are installed at the junction of parts of the chimney system with different diameters. As a rule, when moving from a smaller diameter to a larger one, in situations where several heat generators are connected to the main chimney channel at different levels.
Users of our portal have a unique opportunity to follow how, as part of the project with FORUMHOUSE, we, with our partners, are building a comfortable and energy-efficient Vacation home. For this purpose, when constructing a cottage, the most modern materials and technology.
USHP was chosen as the foundation, and the heating system was underfloor heating. In addition, the boiler room was equipped with a wall-mounted condensing gas boiler. A technical specialist from the company will tell you in a master class format why this particular equipment was chosen for our project and what the advantages of its operation are.
- Operating principle of a condensing gas heat generator.
- Advantages of using a condensing gas boiler.
- In which heating system is it best to use this equipment?
- What to pay attention to when operating a condensing gas boiler.
Operating principle of a condensing gas heat generator
Before we talk about the nuances of condensation technology, we note that an energy-efficient, and therefore comfortable and economical, country house is a balanced structure. This means that, in addition to the closed thermal insulation loop, all elements of the cottage, including engineering system, must be optimally matched to each other. Therefore, it is so important to choose a boiler that goes well with low temperature heating system"warm floor" and will also reduce the cost of purchasing energy in long term.
Sergey Bugaev Ariston technical specialist
In Russia, unlike European countries, condensing gas boilers are less common. In addition to environmental friendliness and greater comfort, this type of equipment allows you to reduce heating costs, because such boilers operate 15-20% more economically than conventional ones.
If you look specifications condensing gas boilers, then you can pay attention to the efficiency of the equipment - 108-110%. This contradicts the law of conservation of energy. While, indicating the efficiency of a conventional convection boiler, manufacturers write that it is 92-95%. Questions arise: where do these numbers come from, and why does a condensing gas boiler work more efficiently than a traditional one?
The fact is that this result is obtained thanks to the thermotechnical calculation method used for conventional gas boilers, which does not take into account one important point evaporation/condensation. As is known, during the combustion of fuel, for example, main gas (methane CH 4), thermal energy, and also produces carbon dioxide (CO 2), water (H 2 O) in the form of steam and a number of others chemical elements.
In a conventional boiler, the temperature of the flue gases after passing through the heat exchanger can reach 175-200 °C.
And water vapor in a convection (ordinary) heat generator actually “flies into the chimney,” taking with it part of the heat (generated energy) into the atmosphere. Moreover, the amount of this “lost” energy can reach up to 11%.
To increase the efficiency of the boiler, it is necessary to use this heat before it is lost and transfer its energy through a special heat exchanger to the coolant. To do this, you need to cool the flue gases to the so-called temperature. “dew point” (about 55 °C), at which water vapor condenses and useful heat is released. Those. - use the energy of phase transition for maximum use calorific value of the fuel.
Let's return to the calculation method. Fuel has a lower and higher calorific value.
- The gross calorific value of a fuel is the amount of heat released during its combustion, taking into account the energy of water vapor contained in the flue gases.
- The net calorific value of a fuel is the amount of heat released without taking into account the energy hidden in water vapor.
The boiler efficiency is expressed in the amount of thermal energy obtained from fuel combustion and transferred to the coolant. Moreover, when indicating the efficiency of a heat generator, manufacturers can by default calculate it using the method using the lower calorific value of the fuel. It turns out that real efficiency of a convection heat generator is actually about 82-85% , A condensation(remember the 11% additional heat of combustion that it can “take away” from water vapor) – 93 - 97% .
This is where condensing boiler efficiency figures appear that exceed 100%. Due to its high efficiency, such a heat generator consumes less gas than a conventional boiler.
Sergey Bugaev
Condensing boilers provide maximum efficiency if the coolant return temperature is less than 55 °C, and these are low-temperature heating systems “warm floor”, “ warm walls"or systems with an increased number of radiator sections. In conventional high temperature systems the boiler will operate in condensing mode. Only in very coldy we will have to support high temperature coolant, the rest of the time, with weather-dependent regulation, the coolant temperature will be lower, and due to this we will save 5-7% per year.
The maximum possible (theoretical) energy savings when using condensation heat is:
- during combustion natural gas – 11%;
- when burning liquefied gas (propane-butane) – 9%;
- when burning diesel fuel (diesel fuel) – 6%.
Advantages of using a condensing gas boiler
So, we have dealt with the theoretical part. Now we’ll tell you how the design features of a condensing boiler affect its operating efficiency and durability. At first glance, it seems that it is possible to use the additional energy of water vapor hidden in the flue gases in a conventional boiler, specially “driving” it into a low-temperature operating mode. For example, by connecting the boiler (this is incorrect) directly to the underfloor heating system or by significantly lowering the temperature of the coolant circulating in the radiator heating system. But, we already wrote above that during the combustion of main gas a whole “bouquet” of chemical elements is formed. Water vapor contains: carbon dioxide and carbon monoxide, nitrogen oxides, and sulfur impurities. During condensation and the transition of steam from a gaseous to a liquid state, these impurities end up in water (condensate) and the output is a weak acidic solution.
Sergey Bugaev
The heat exchanger of a conventional boiler will not withstand long work in an aggressive chemical environment, over time it will rust and fail. The condensing boiler heat exchanger is made of materials that are corrosion resistant and resistant to acidic environments. The most resistant material is stainless steel.
In the manufacture of the condensing boiler, only durable and wear-resistant materials are used. This increases the service life and reliability of this equipment, and also reduces maintenance costs.
In addition, increased requirements are placed on other structural elements of the condensing heat generator, because it is necessary to cool the flue gases to desired temperature. For this purpose, the boiler is equipped with a forced-air burner with high degree modulation. This burner operates over a wide power range, which allows you to optimally regulate water heating. Condensing boilers are also equipped with automatic equipment that ensures precise maintenance of the combustion mode, temperature of the exhaust gases and water in the return line. Why are they placed? circulation pumps, smoothly changing the pressure force of the coolant flow, and not like simple 2- and 3-speed ones. With a conventional pump, the coolant flows through the boiler at a constant speed. This leads to an increase in the temperature in the “return”, an increase in the temperature of the flue gases above the dew point, and, consequently, a decrease in the efficiency of the equipment. It is also possible for the heating system (warm floor) to overheat and reduce thermal comfort.
Important nuance: the burner of a conventional boiler cannot operate at a power lower than 1/3 of the maximum (rated) power of the heat generator. The condensing boiler burner can operate at a power of 1/10 (10%) of the maximum (rated) power of the heat generator.
Sergey Bugaev
Consider the following situation: started heating season, outside temperature -15 °C. The power of a conventional boiler installed in a house is 25 kW. The minimum power (1/3 of the maximum) at which it can operate is 7.5 kW. Let's assume that the building's heat loss is 15 kW. Those. The boiler, continuously operating, compensates for these heat losses, plus there remains a power reserve. A few days later there was a thaw, which, you see, often happens during the winter. Eventually outside temperature now around 0°C or slightly below. The heat loss of the building, due to the increase in outside temperature, has decreased and is now approximately 5 kW. What will happen in this case?
An ordinary boiler will not be able to working continuously, produce the 5 kW of power necessary to compensate for heat loss. As a result, it will go into the so-called cyclic mode of operation. Those. the burner will constantly turn on and off, or the heating system will overheat.
This mode is unfavorable for the operation of the equipment and leads to its accelerated wear.
A condensing boiler, with the same power and in a similar situation, in continuous operation will quietly produce 2.5 kW of power (10% of 25 kW)¸ which directly affects the service life of the heat generator and the level of comfort in a country house.
The condensing boiler, complemented by weather-compensating automation, flexibly adapts to changes temperature regime throughout the heating season.
Modern automation makes it possible to significantly simplify the process of boiler control, including remotely, using a special mobile application for smartphones, which increases the ease of use of the equipment.
Let us add that the heating season in Russia, depending on the region, is on average 6-7 months, starting in the fall, when it is not very cold outside, and lasting until spring.
Approximately 60% of this time, average daily temperatures outside remain around 0 °C.
It turns out that maximum power a boiler may be required only in a relatively short period of time (December, January), when real frosts have set in.
In other months, the boiler is not required to go out to maximum mode work and increased heat transfer. Consequently, a condensing boiler, unlike a conventional one, will work effectively even with temperature changes and slight frost. At the same time, gas consumption will be reduced, which, in tandem with a low-temperature heating system (warm floor), will reduce the cost of purchasing energy.
Even when using a condensing boiler together with high-temperature radiator heating, this equipment works 5-7% more efficiently than traditional ones.
Sergey Bugaev
In addition to being economical, important advantage condensing boilers is the ability to obtain high power with compact equipment sizes. Condensing gas boiler in wall-mounted version especially relevant for small boiler houses.
In addition, the condensing boiler has a turbocharged burner, which allows you to abandon the standard expensive chimney and simply remove the coaxial chimney pipe through a hole in the wall. This simplifies the installation of equipment or the installation of a new condensing boiler to replace the old - conventional one, during renovation existing system heating.
Features of operation of a condensing gas boiler
Frequently asked questions from consumers: what to do with the condensate obtained during the operation of the boiler, how harmful it is, and how to dispose of it.
The amount of condensate can be calculated as follows: per 1 kW*h there are 0.14 kg. Consequently, a condensing gas boiler with a power of 24 kW when operating at 12 kW of power (since most of the heating period the boiler operates with modulation, and the average load on it, depending on conditions, can be below 25%) on a fairly cold day produces 40 liters of condensate at low temperature.
Condensate can be drained into the central sewer, provided that it is diluted in a ratio of 10 or better 25 to 1. If the house is equipped with a septic tank or local treatment plant, neutralization of the condensate is required.
Sergey Bugaev
The neutralizer is a container filled with marble chips. Filler weight – from 5 to 40 kg. It must be changed manually on average once every 1-2 months. The condensate, usually passing through the neutralizer, flows by gravity into the sewer system.
Summarizing
This is modern equipment that is reliable, economical and efficient. Emissions of harmful substances into the atmosphere are also reduced, which is especially important when environmental standards are tightened. In addition, the installation of this type of heat generator, by reducing gas consumption, will reduce heating costs in the long term and increase the level of comfort in a country house.