Condensing gas boiler. Floor standing gas condensing boilers - principle of operation, advantages and disadvantages

Floor gas condensing boilers from the German company Buderus are the perfect combination of all the best qualities of heating technology. Outstanding efficiency in a compact size, innovative solutions and ease of use - all this and more, make Logano wall-mounted gas condensing boilers an excellent choice.

When a heating system provides the combination of power and efficiency that Buderus Logano gas condensing boilers offer, you can only enjoy warmth and comfort. Everything is concentrated in them: modulated power control, standardized duty cycle up to 108%, as well as low installation and maintenance costs.

Vendor code: 7736613553

Modern technological solutions used in the manufacture of the boiler make heating even more comfortable and economical. This heat unit will successfully replace outdated equipment during the modernization of the boiler room, freeing up space and saving money.

Vendor code: 7736613554

Vendor code: 7736613555

Modern technological solutions used in the manufacture of the boiler make heating even more comfortable and economical. This heat unit will successfully replace obsolete equipment during the modernization of the boiler room, freeing up space and saving money.

Vendor code: 7736613556

Modern technological solutions used in the manufacture of the boiler make heating even more comfortable and economical. This heat unit will successfully replace obsolete equipment during the modernization of the boiler room, freeing up space and saving money.

Vendor code: 7736613557

Modern technological solutions used in the manufacture of the boiler make heating even more comfortable and economical. This heat unit will successfully replace obsolete equipment during the modernization of the boiler room, freeing up space and saving money.

Vendor code: 7731600024

Vendor code: 7731600025

Floor-standing condensing boiler equipped with modern BC 20 automation and high-performance heat exchanger. Class A energy efficiency. The System version is equipped with an electronic circulation pump and an assembly for connecting a diverter valve.

Vendor code: 7736603034

Vendor code: 7736603028

Buderus Logano plus KB372-100 L RU 100 kW is a powerful, quiet and efficient condensing gas boiler. It has unique hydraulic characteristics, compact dimensions, flexible connection to heating systems and a modern interface.

Vendor code: 7736603035

Vendor code: 7736603029

Buderus Logano plus KB372-150 L RU 150 kW is a powerful, quiet and efficient condensing gas boiler. It has unique hydraulic characteristics, compact dimensions, flexible connection to heating systems and a modern interface.

Vendor code: 7736603036

Vendor code: 7736603030

Buderus Logano plus KB372-200 L RU 200 kW is a powerful, quiet and efficient condensing gas boiler. It has unique hydraulic characteristics, compact dimensions, flexible connection to heating systems and a modern interface.

Vendor code: 7736603037

Vendor code: 7736603031

Buderus Logano plus KB372-250 L RU 250 kW is a powerful, quiet and efficient condensing gas boiler. It has unique hydraulic characteristics, compact dimensions, flexible connection to heating systems and a modern interface.

Vendor code: 7736603038

Vendor code: 7736603032

Buderus Logano plus KB372-300 L RU 300 kW is a powerful, quiet and efficient condensing gas boiler. It has unique hydraulic characteristics, compact dimensions, flexible connection to heating systems and a modern interface.

Vendor code: 7736603033

Buderus floor-standing gas boilers have everything to make them the best in terms of price-quality ratio. Designing and installing equipment is as simple as you can imagine. Coordinated components assembled and pre-configured at the factory save the customer a lot of time. The automatic variable premix gas burner, factory assembled and set to natural gas operational readiness, ensures immediate readiness for operation. The large hatch for cleaning the heating surfaces is convenient for inspections and mechanical cleaning. The Logamatic EMS (Energy Management System) automation system that controls the energy consumption ensures optimal control of the combustion process, and the SDS (Service Diagnosis System) service diagnostics system ensures the high operational reliability of the buderus floor-standing gas boiler.

Floor-standing boilers Buderus - one for all:

Floor standing gas boilers Buderus can work in any heating system. However, the optimal use of the heat of the condensation process is ensured in low-temperature systems, for example, at 30-40 ° C. With all this, even in heating installations with a design temperature of 70-90 ° C, condensation heat can be used for approximately 80% of the duration of the heating period. .

Floor-standing boilers Buderus - the details that decide everything:

Buderus Logano gas condensing floor standing boilers are a prime example of well-designed heating equipment that is characterized by high efficiency, reliability and long service life.

The gas valve with integrated leak detection and standard gas filter guarantees quick and easy commissioning.

Logano floor-standing condensing boilers can operate in two modes of combustion air intake: from the installation room and from outside. Independence from the air in the room significantly increases the scope of heating equipment from Buderus.

Quiet, economical pre-mix burner with low emissions, wide modulation range 15-100%.

The Logamatic control system can be easily and quickly expanded functionally by installing various additional modules. In addition, the control unit, for better access, can be placed on the front or side walls of the boiler body.

All parts in contact with flue gases and condensate are made of stainless materials. The heat exchanger, which has large heat transfer surfaces, has a high standardized utilization factor - up to 110%.

The three-pass or two-pass design of the boilers contributes to high performance and low emissions of harmful substances. Compact design, light weight and small footprint make Buderus Logano floorstanding gas condensing boilers the ideal choice for retrofitting outdated heating equipment, as well as when designing heating and hot water systems for new residential or industrial buildings.

Owners of private housing construction are interested in cheap ways to heat their homes in the winter. Condensing gas boilers that have recently appeared on the market have the highest efficiency among analogues. In addition, with their help, from 10 to 35% of the energy carrier is saved, which has a positive effect on the consumer's budget.

Principle of operation

This unit is designed on the basis of a conventional (convection) heat generator. The energy carrier for both types of boilers is natural or liquefied gas.

The principle of operation of a convection boiler is extremely simple. The fuel, burning, through the heat exchanger transfers energy to the coolant (most often ordinary water). Heated water circulates through the heating system, heating the home.

Combustion products with a temperature of 140–150°C, consisting of carbon dioxide and water vapor, are removed through the chimney. As a result, the efficiency of this heat generator is from 90 to 93%, the remaining 7–10% of unused energy escapes into the atmosphere.

It is important! At flue gas temperatures below 140°C, condensate forms on the walls of the chimney, which, when it enters the boiler, adversely affects metal components, reducing the durability of the unit itself.

Differences in the operation of conventional and condensing boilers

In a condensing boiler, the combustion products, having passed through the main heat exchanger, enter the aftercooling chamber with a secondary (condensing) heat exchanger, through which the cooled water (return) moves. Passing through this heat exchanger, the gases cool down. At temperatures below 56°C (dew point - dew point), water vapor is converted to condensate. The thermal energy released in this case is used to preheat the "return". The temperature of the gases entering the atmosphere through the chimney drops to 40-60°C.

Thus, already slightly heated water enters the main heat exchanger. As a result, the boiler needs to spend less fuel to heat the coolant to the desired value.

Manufacturers claim that the efficiency of these units reaches 104-108%. From the point of view of physics, this is impossible. This value is conditional and is a marketing gimmick. In this case, the energy released during the combustion of fuel is taken as 100% efficiency.

Scheme of formation of efficiency in gas boilers.

Wall-mounted boilers are used to heat small detached buildings.

floor standing

The power of floor units reaches 1000 kW. They have large dimensions and weight. Requires space for additional equipment and piping. Under them, a separate room is usually allocated.

Differ in simplicity of a design and complexity of installation. Used for heating industrial and commercial buildings with large areas.

Floor boilers are installed in large rooms

By appointment, condensing boilers are divided into double-circuit and single-circuit.

Dual circuit

In addition to heating the premises, they supply water to the hot water supply system (DHW). For this, the boiler is equipped with an additional heat exchanger. In addition, a three-way valve is installed in the boiler, which regulates the flow of water to only one of the systems. When using hot water for domestic purposes, the valve automatically stops the supply of coolant to the heating system, as it is set to DHW priority.

The capacity of the DHW circuit is relatively small. The inclusion of hot water at several points at the same time quickly leads to a decrease in its temperature.

The use of double-circuit boilers is advisable when hot water is consumed infrequently and in small volumes.

single circuit

Designed for space heating only. However, in many models it is possible to connect an indirect heating boiler to the boiler - a storage tank that automatically maintains the required temperature. Its volume is selected depending on the owner's needs for hot water supply. This allows you to use hot water for your own needs without restrictions, without turning off the heating system. It is convenient to install a single-circuit boiler with a boiler in a house with three or more tenants.

Advantages and disadvantages of a condensing gas boiler

Due to the large number of advantages compared to conventional boilers, condensing heat generators are increasingly popular among the population. But these units also have disadvantages that must be taken into account.

pros	Minuses
Small dimensions and weight (wall-mounted)	High purchase price
High efficiency	Efficiency and expediency of operation only in low-temperature heating systems
Flexible modulation according to the required parameters	The need for disposal or neutralization of condensate
Energy saving up to 35%	High sensitivity to supply air quality
High environmental friendliness
Low noise and vibration
Low exhaust temperature
Ease of installation (wall-mounted)
Savings on the arrangement of the chimney

Popular brands

Having decided to purchase this type of heat generator, it is better to pay attention to modern reliable models of well-known manufacturers.

"Buderus Logamax Plus GB172i" (Germany)

Wall mounted condensing boilers of a new generation with a capacity of 20 to 42 kW, embodying the latest developments in the world of heating technology. They have excellent performance and modern design:

• Regulatory efficiency - 109%;
• For the manufacture of the front panel, impact-resistant glass "Titanium glass" is used;
• Highly efficient and durable heat exchangers WB5 and WW6 made of aluminum alloy ALU plus;
• Built-in pump with class A energy efficiency;
• High efficiency burner, modulation range - 1:8;
• Automation "Buderus Logamatic ВС 25" with the possibility of integrating additional automation to expand functionality;
• The presence of a weather-dependent mode (burner operation relative to the external or internal temperature);
• Work on antifreeze;
• Branch pipe for coaxial chimney 80/125;
• Possibility of adding automation "Buderus Logamatic TC100" or "Logamatic web KM200" to control the operation of the boiler via the Internet;
• Energy efficiency class - A.

Boiler models "Buderus"

There are two-circuit and single-circuit models. An indirect heating boiler can be connected to the latter.

Price - from 88,000 rubles.

Viessmann Vitodens 100-W (Germany, Turkey)

Models of this line are a good combination of high efficiency, reliability and price.

Are issued with power from 19 to 35 kW.

Viessmann Vitodens 100-W boilers operating on liquefied and main gas are ideal for heating private houses and office premises:

The price of models running on liquefied gas is from 76,000 rubles.

The price of models running on main gas is from 96,500 rubles.

Vaillant ecoTEC plus VU OE (Germany)

This range of single-circuit boilers is environmentally friendly and economical. The power of the manufactured units is 30–65 kW.

Ideal for low temperature heating systems:

• Rated efficiency - 108%;
• Simulated burner with a wide range of 28-100%;
• Primary and condensing heat exchangers are made of stainless steel with increased resistance to corrosion;
• Environmental friendliness;
• Automatic air vent;
• Two-stage circulation pump with automatic switching;
• Variable speed fan;
• Integrated expansion tank;
• Siphon for condensate removal;
• System for increasing the efficiency of the condensing heat exchanger "Agua-Kondens";
• Electronic ignition;
• Flame control system;
• Built-in switching module for the interface;
• Smoke exhaust pipe 60/100 mm.

For the DHW system, an indirect heating boiler is connected.

All Vaillant models are IPX4D rated.

Price - from 91500 rubles.

Baxi Duo-Tec Compact (Italy)

The line is represented by a single-circuit boiler with a capacity of 24 kW and two double-circuit boilers with a capacity of 24 and 28 kW.

They are distinguished by the introduced advanced technologies, ease of installation, operation and maintenance at a low price:

• Rated efficiency - 109%;
• Changeover to liquefied gas;
• Primary and secondary (two-circuit) heat exchangers are made of stainless steel AISI 316L;
• Steel burner with modulating factor 1:7;
• Flame control system with ionizer;
• Circulation pump with high energy saving;
• Built-in automatic air vent;
• Electric three-way valve (in all models);
• Mode of operation relative to the built-in weather-compensated automation;
• Management of separate different temperature zones;
• Protection systems against overheating, freezing, blocking;
• NTC sensor that monitors the level of exhaust gas pollution;
• Self-diagnosing electronics.

If necessary, an indirect heating boiler is connected to a single-circuit model.

Gas boiler "Baxi Duo-Tec Compact"

Price - from 50500 rubles.

The described models have gained popularity due to their efficiency, impeccability, and reliability.

In the modern world, great importance, especially in recent years, has been given to the problems of heat and energy saving. This is connected with the issues of saving resources, and with a reasonable attitude towards the environment. An effective way to combine such "environmental savings" was the use of methods of utilization and recovery of residual heat.

A couple of years ago, these methods were used only in large-scale industries, but today environmentally friendly and economical devices are available to the average consumer. These issues are especially important in the field of individual heating. So scientists created gas condensing boilers.

What is the essence of this technology?

As you know, when natural gas is burned, steam is formed, which has a small amount of energy. So, this energy can be extracted. In conventional gas boilers, steam and exhaust gases simply heat the coolant and are discharged outside.

Condensing boilers are equipped with an additional circuit, where this “unnecessary” heat is taken additionally. All combustion products are cooled to a temperature of about 55 degrees, at which the process of water condensation occurs.

In the process of condensation, latent heat is released, and it is transferred to the coolant. It turns out that such a gas condensing boiler will work both more efficiently and more economically.

The main advantages of this unit are:

1. In high efficiency, which is about 109% - not a single gas device can boast of such an indicator.
2. The condensing boiler consumes 20% less fuel (compared to a conventional appliance).
3. The device may have a lighter plastic chimney due to the fact that the exhaust gases from the boiler have a low temperature (at 40 ° C).

As for the disadvantages of this type of boiler. Condensing gas appliances require a condensate drainage system. Difficulties sometimes arise with this, especially when choosing a gas wall-mounted boiler. After all, it will be difficult to connect it to the sewer to remove condensate.

And another drawback is the low temperature of the coolant. It will be necessary to calculate other heating elements that have a large capacity.

Condensing boilers - video review

Distinctive features of the technological device

Condensing boilers, in addition to all their advantages, also have design features. Their heat exchanger is made of reliable high-quality steel, and a spiral with small holes is installed in the heat exchanger itself, which allows heated gas to pass through.

Another "highlight" of this type of heating is a burner. It is in it that the gas is enriched with oxygen, due to which the entire fuel volume is effectively burned. Such a burner was invented in order to remove the vapors released by the condensate and harmful substances that can cause corrosion of the heat exchanger.

Gas condensing models, like classic heating units, can be single- and double-circuit. That is, serve only to heat the house, or also perform the function of heating water. Also, condensing boilers differ in the installation method - they can be wall-mounted and floor-mounted.

Wall-mounted heating boilers

Such models are popular as a boiler with a boiler, since most often these condensing boilers perform two functions at once - water heating and heating. In this equipment, a heat exchanger with a special high-performance core will be installed.

Which manufacturers offer condensing wall-mounted and technological boilers?

Beretta heating boilers - Italian representatives of boilers from a well-known company. The price of the cheapest unit will be 570 USD. such a model will have a power of 11 kW, an automatic ignition system, temperature control and the possibility of self-diagnosis.

Beretta gas boilers differ in several more features:

1. Equipped with cast iron parts, which are made specifically for Italian boilers.
2. Are completed with torches for work on gas and gas-diesel fuel.
3. Equipped with adjustable temperature.

Wall-mounted boilers Lamborghini - These condensing gas appliances are characterized by high power, and most of the devices are equipped with an aluminum heat exchanger. The price of Lamborghini boilers starts from 2100 USD. - this is how much a condensing unit with a capacity of 53 kW will cost.

Boilers also differ:

• The presence of a relay that controls the flow of gas.
• Electric ignition system.
• The presence of a thermostat that reacts to poor draft and turns off the device in case of danger of smoke.
• The presence of operating modes "winter / summer".

Floor boilers

Such condensation models are designed for a large area and, as a rule, they have increased power (compared to wall models). Most often, floor-standing gas boilers are made in a single-circuit version - they serve only for space heating.

The price of floor models due to increased power is sometimes more than double-circuit models. This is due to the fact that the floor heating condensing boiler most of all “taken root” in large houses - it works more efficiently, and consumes less fuel than a classic appliance.

A floor-standing powerful condensing boiler is available from several brands, but the models from Baxi and Viessmann are considered the most “strong”.

Floor-standing boilers from Baxi and Viessmann are designed to heat a large house - their power is up to 65 kW, which is enough to heat a house of 650 square meters. Of course, the price of such a unit will be about 3000 USD.

But not only this is due to such a price, in addition, Baxi and Viessmann gas condensing boilers are equipped with:

1. steel heat exchanger.
2. Electronic manometer.
3. Antifreeze system.
4. Touch control panel.

How to choose a condensing device?

Firstly, it is worth saying that a condensing-type gas heating boiler, although it costs more than other appliances, will pay for itself with fuel savings in a couple of years. In addition, it is the condensing boiler that will consume gas much more economically and heat a large house more efficiently.

It is worth choosing the optimal model based on the general parameters - the method of installation, power and the availability of automatic and protective systems.

• A boiler with a power of 25 kW will cope with heating a house of 150-180 square meters.
• A medium power device is capable of heating water up to 60 degrees.
• The average water heating indicator of a heating boiler is 10 liters of water that will heat up in one minute to a temperature of +25 °C.
• The optimal gas consumption for a house of 100-160 square meters. meters is 2.7 cubic meters / hour.

Due to their design features and principle of operation, condensing boilers use fuel energy much more efficiently and economically than traditional gas units. Despite the fact that the price of condensing equipment is still high, homeowners are increasingly opting for it. And this is not surprising - the efficiency of the boiler reaches up to 98%, and gas savings reach up to 20%. Experts say that condensing technology is the future.

The principle of operation of condensing boilers

The cost of fuel is getting higher every year, so energy-saving technologies are steadily gaining popularity. Condensing boilers appeared in the middle of the last century, but they could not immediately win the trust of consumers. At that time, the devices were unreliable, and manufacturers had to refine their design. As a result, they have achieved that these models of heating cats have taken a leading position in the market.

An interesting fact is that European countries encourage and support their citizens who decide to buy a condensing gas boiler by providing loans at minimal interest.

A conventional natural gas heating boiler uses only part of the energy obtained from the combustion of fuel. Exhaust gases, which have a sufficiently high temperature and powerful potential, are discharged into the atmosphere through the chimney, giving off unused heat to the outside air. The condensing gas unit more efficiently uses the heat resources released not only during the combustion of gas, but also during the condensation of water vapor contained in smoke. The steam entering a separate heat exchanger, being cooled, turns into a liquid called condensate. This releases some heat. Moisture is removed to the condensate collector, and thermal energy - to the heating system.

A conventional gas boiler uses the lower calorific value during operation, while condensing-type equipment uses the higher one, consisting of the heat released during the combustion of the fuel and the heat that appears during condensation. This is the more efficient use of natural gas and efficiency, as well as increased efficiency indicators, which distinguish not only floor units, but also wall-mounted heating devices.

The condensing type equipment in question is excellently suited for both radiator heating and hot water systems, and for a “warm floor” device.

The design of condensing heating devices

Any of the boilers has a heat exchanger in which the coolant is heated, which then enters the heating system of the house through the piping. Gas boilers of the condensing principle of operation are equipped with two heat exchangers, the first of which operates according to the traditional scheme, and the second, condensing, is put into operation later.

The secondary heat exchanger is a structure of pipes of complex cross section with helical fins. This form allows you to significantly increase the area in contact with steam. Flue gases in an additional heat exchanger heat the coolant coming from the return line. At this point, the water vapor cools down to the dew point, resulting in condensation.

In other words, in a condensing boiler part of the energy is returned for reuse, while in the operation of a conventional boiler it irretrievably escapes into the atmosphere along with steam.

For the manufacture of secondary heat exchangers, stainless steel is used, as well as coatings from aluminum-silicon alloys called silumin. This protects the device from chemically aggressive condensate.

Gas condensing boilers are equipped with high-tech burners. Their peculiarity lies in the fact that in the combustion mode they provide constant control over the proportions of mixing the gas-air mixture, observing the optimal ratio. The design of heating devices has a closed-type combustion chamber, isolated from the room. Therefore, the boilers in question are relatively safe equipment.

Externally, energy-saving and traditional gas boilers are practically no different. Manufacturers produce wall models and floor models, in single-circuit and multi-circuit versions. But you should pay attention to the fact that condensing equipment has more power with the same dimensions. For example, wall-mounted boilers that use the heat of air vapor can have a power of up to 110 kW, while conventional gas units with a capacity of more than 40 kW are already available in the floor version.

Modern models of heating boilers using the condensing principle of operation are available in two versions - with dry or wet heat transfer. The first option is intended for residential buildings, and the second, more efficient and expensive, for boiler houses. But boilers with wet heat transfer have not yet been fully developed, because. are still under development.

Condensate disposal

During the day, the condensing boiler produces a fairly large volume of condensate. It depends on the power of the equipment and can be 30 or more liters. It is not allowed to drain aggressive liquid directly into the domestic sewer, therefore manufacturers equip modern gas heaters with neutralizers.

An additional device is a separate tank into which acid condensate enters. It passes through a layer of alkali metals (magnesium and potassium), resulting in a chemical reaction. As a result, the condensate decomposes into carbon dioxide and water, which can already be drained into the sewer system.

How profitable is the use of condensing boilers

There are many opinions about the economic benefits of using condensing gas equipment in domestic conditions. The fact is that for consumers in Russia, the price of gas is provided much lower than for residents of European countries. Therefore, some experts argue that condensing boilers in our conditions will pay off for at least ten years. But this is not true.

First, gas is not as cheap as we would like. Secondly, feedback from the owners of heating boilers suggests that significant savings can be seen as early as 2-4 years of operation. This period depends on the technical characteristics of the equipment, such as power, and on the optional equipment.

For clarity, some examples should be considered.

A budget option

A condensing boiler with a built-in heat exchanger for a private house with a heat load of up to 30 kW with the simplest wiring and connection of only heating radiators will cost a third more than a traditional boiler. But operating costs at maximum load will make it possible to return this difference in 3.5-4 years, taking into account the annual increase in gas prices. In the future, the condensing boiler will begin to significantly save fuel costs, becoming more profitable every year.

advanced option

The price of a traditional boiler (including the purchase of a set of additional devices) for a house requiring a heat load of approximately 35 kW, with a multi-circuit heating distribution system and a 200-liter hot water tank, will be higher than condensing gas equipment. Therefore, there is no need to talk about payback here. It turns out that the condensing boiler, designed for medium heat loads, from the first day begins to save the owner's money.

Highly advanced version

In this category, you can consider multi-circuit boilers with a heat load reaching 60 kW. In this case, it will be necessary to complete the condensing boiler already, so its price will be 15-20% higher. But the difference, taking into account the rise in gas prices, will equalize earlier than with the budget option. It will be possible to talk about payback in 2.5-3 years.

Feedback from experts and consumers suggests that condensing heating boilers are preferred by those owners who know how to count their money. They understand that in addition to saving on gas bills, such equipment will last at least twice as long as a conventional gas appliance.

But do not forget that the efficiency of condensing equipment will depend on several factors:

• boiler age;
• the correct ratio of the heated volume and the power characteristics of the unit;
• use of modern gas burners.

Installation of floor gas boilers

In the floor version, boilers of high power are made. They are installed in separate rooms in which there is the possibility of organizing additional ventilation. The installation process is carried out in stages.

1. At the stage of preparatory work, a foundation is made in the form of a concrete cushion 100-200 mm high or a support frame is installed.
2. The places of connection to the boiler equipment of the chimney, supply and return heating pipes are determined and organized.
3. A gas boiler is installed on the prepared base at a horizontal level. Its adjustment is made by screw legs.
4. The unit is connected to the pipelines of the coolant circulation system. This takes into account that double-circuit and multi-circuit boilers have additional pipes and flexible piping.

Before entering the heating boiler, a special coarse filter must be installed on the return pipe to prevent scale or rust from entering the heat exchanger.

1. The unit is connected to the gas pipeline using copper pipes or flexible hoses. A valve is mounted on the inlet pipe. The outlet pipe is connected to the chimney.
2. Check the seams and connections for tightness, and the gas pressure in the pipeline - for compliance with regulatory requirements.

Regardless of the model, floor gas boilers are allowed to be installed in rooms with a ceiling height of at least two meters. A single unit requires a minimum space volume of 7.5 m3 and a mandatory vent to allow air to flow in from outside.

The minimum distance from a wall made of non-combustible materials is allowed to be 100mm. Roofing steel with a thickness of at least three millimeters is used as an insulating material.

On the floor under the gas boiler, non-combustible coatings are required. It could be:

• steel sheet;
• tile;
• a natural stone;
• cement strainer;
• expanded clay concrete slabs.

Installation of wall-mounted boilers

Wall-mounted appliances are installed after preparing the electrical supply and connections to the hydraulic and gas circuits, which is done using the attached templates. Before this is determined:

• location of the heater;
• possibility of communication device;
• the admissibility of organizing the correct removal of combustion products.

It is required to fix the wall-mounted heating boiler to a reliable base. In most cases, load-bearing walls or a specially installed frame in the form of frames, consoles, suspensions, racks, etc. are used for this. Manufacturers provide a range of fixtures and fittings supplied with the equipment or purchased separately. Also, the wall-mounted unit can be fixed to a vertical fence using a mounting frame made for a specific model of the heater. Its use in a set with decorative panels and covers allows you to harmoniously fit the condensing equipment into the interior of the room.

After installing the boiler on the wall, they proceed to its direct connection to the connected engineering networks and communications.

The branch pipe responsible for the removal of carbon monoxide is connected through corrugated pipes to the chimney. At the same time, their sharp bends are not allowed. The chimney must not be located at a distance of less than 100mm from flammable surfaces. In any case, it will be better to isolate them.

Valves are installed on the gas pipes and the gas pipelines are checked for tightness. The wall-mounted boiler must be connected by a specialist, carrying out appropriate tests and purging pipes.

To be able to connect the equipment to the 220V power grid, you will need to install an outlet and have a stabilizer. Do not forget about the grounding of condensing boilers, as well as the fact that contact of the cable with hot elements can lead to its melting and failure. The safety requirement must be observed unquestioningly.

The water circuit is connected to the wall-mounted boiler, adhering to the appropriate diagrams supplied with the equipment.

Features of chimneys for condensing boilers

Ready-made chimney pipes made of plastic or aluminum are installed on wall-mounted and floor-standing condensing-type boilers. By design, they can be:

• coaxial, which is a "pipe in pipe" design;
• two-pipe, divided into a smoke exhaust and air intake segment.

The low temperature of the exhaust gases escaping through the chimney allows the use of plastic in the exhaust system. At a temperature of 35-70 degrees, it does not deform, does not melt and perfectly copes with its functions.

This circumstance significantly helps when replacing an old boiler with a brick chimney with new equipment. A conventional gas boiler will require the dismantling of the old chimney, because due to temperature fluctuations and aggressive condensate, the masonry will collapse too quickly. To prevent an emergency, you will have to think in advance about installing an anti-corrosion, gas-tight stainless steel chimney or polymer liners, the price of which is quite high.

For a condensing boiler, you can limit yourself to lining the old chimney with plastic, which will come out much cheaper.

Myths about condensing boilers

The popularity of any product always gives rise to multiple rumors and myths that do not always reflect reality. Condensing boilers, both wall-mounted and floor-standing, are no exception. Let's try to understand some of them.

Price

Experts say that condensing boilers are more expensive than traditional gas units. But this is only with a superficial glance at the price tag or price list. Having sorted out the issue, you can understand that the equipment differs not only in price and version (wall-mounted or floor-standing, single- or double-circuit devices), but also in terms of thermal power.

Paying attention to the technical characteristics of gas boilers of different principles of operation, as well as comparing two units with the same performance and capabilities, you can see that the final price of traditional equipment is often higher than condensing. And if we take into account that conventional gas boilers require additional devices, the price of which can be significant, then the question of a higher cost of condensing equipment will disappear by itself.

efficiency

Many manufacturers claim that their condensing boilers are over 100% efficient. This statement is ambivalent. On the one hand, it is quite attractive to consumers, and on the other hand, it causes bewilderment.

The use of additional heat, of course, raises the efficiency of the use of this type of equipment and increases the efficiency. But talking about a coefficient exceeding 100% can only be conditional.

The fact is that in order to facilitate the comparison of two types of gas heating equipment, the efficiency calculation is carried out according to the method for determining the indicator for traditional boilers using only the lowest calorific value. And here the heat of condensation is not taken into account, which adds 7-9% to the efficiency. Condensation plants use 100% lower heat and part of it that has arisen as a result of the condensation process, which adds up to an indicator of 107-109%. In fact, the efficiency does not rise above 98%.

Chimney

Despite the opinions about the need for devices for condensing chimneys made of acid-resistant materials, the price of which is quite high, they are not much different from conventional chimneys installed in closed-fired gas unit systems.

Waste combustion products are removed forcibly, so the boilers in question can be connected to various smoke exhaust systems. The main thing is to respect the tightness of the structure.

Condensate

Many consumers are sure that during the operation of the boiler there are problems associated with the appearance of condensate. But manufacturers of condensing equipment include systems for neutralizing and utilizing aggressive moisture in the design of devices. For conventional gas units, in the chimneys of which, although in smaller quantities, condensate is present, vents and neutralizers are installed additionally.

Notable Manufacturers

The market for heating equipment is diverse and extensive. Domestic and foreign manufacturers offer a huge range of boilers that differ in their dimensions, power and type of fuel used. Among the most famous manufacturers of condensing equipment, there are several companies.

The German company appeared in 1917 as a workshop for the production of agricultural machinery, and 10 years later its founder Johann Wiessmann developed and produced the first boiler. Until now, the enterprise is headed by one of the representatives of the family, already in the third generation.

Today, Viessmann includes several companies specializing in heating systems, as well as ventilation and refrigeration systems. Its products are mainly produced for export, and production sites are located in 11 countries. The company produced the first condensing boiler in 1992.

A small private company was founded by the Prussian engineer Johan Vaillant in 1874. Thanks to the extraordinary abilities of the owner, she quickly achieved success. Since 1894, the company began producing gas equipment, and today the Vaillant Group, which has factories in 7 countries, is known all over the world, including for its developments in the field of energy-saving equipment.

Bosch

The workshop, founded in 1886 by the German inventor-researcher Robert Bosch, had nothing to do with heating boilers for a long time. Only in 1929, the founder of the company decided to restructure it and move to a wider area of ​​activity. Since that time, many enterprises have joined the structure of the corporation, including firms manufacturing household boiler equipment.

The history of the German company Buderus began in 1731, when its founder, Johann Wilhelm Buderus, rented a small metallurgical plant where cast-iron parts for furnaces were produced. In 1898, the company received a patent for its own sectional boilers, and in 1981, cast-iron condensing equipment was introduced. Since 2003, the Buderus trademark has been owned by the Robert Bosch GmbH group of companies.

Baxi

The company appeared in 1866 in England. It was founded in partnership between Richard Baxendael and Joseph Heald, and the Baxi trademark was used only in 1930 when one of the heating systems was released. Today, boilers of the Italian production Baxi S.p.A., belonging to one of the enterprises of the Baxi Group holding, are entering the Russian market.