How to install a parapet gas boiler with your own hands and which one is better to choose - Russian or imported. Parapet gas boilers for heating a private house, how to choose a parapet gas boiler for heating a private house

For many owners of private homes, choosing a heating boiler is a difficult task.

Need to pick up best option, which has the most successful set of functions and characteristics.

This is only possible if you have sufficient knowledge about the design and operating principle of gas boilers, understanding their features and advantages.

Exist different types gas units with their own characteristics and capabilities.

Let's consider one of the groups of such equipment - parapet boilers.

Parapet gas boilers represent heating units, combining the features of atmospheric and turbocharged models. They are completely energy independent, but are equipped with a closed combustion chamber.

A special feature of this design is the use of a coaxial chimney, which is connected to the rear of the unit and vented to the street. Smoke removal and fresh air intake occur as a result of convection processes.

When the boiler is put into operation, no odors are felt in the room; there are not even traces of soot or other combustion products.

In addition, oxygen does not burn out in the room, which allows you to maintain a normal microclimate.

Another feature of parapet boilers is the ability to be used as independent heating elements. There are special holes in the lower part of the case through which hot air escapes.

It circulates in the room and provides it with the desired temperature.

What is the difference from the usual?

The main difference between parapet models and conventional boilers is the ability to obtain increased safety from a non-volatile design and no impact on the internal atmosphere of residential premises.

If a conventional atmospheric boiler consumes ambient air, actively burning oxygen and requiring constant ventilation, then parapet models are completely separate and do not disturb the air exchange regime.

Another difference is the ability to independently heat the air, making the parapet boiler similar to a stove.

Advantages and disadvantages

The advantages of parapet boilers include:

• no electricity consumption;
• no internal air is used, there is no additional load on the ventilation system;
• there is no need to connect to a common chimney;
• low fuel consumption;
• efficiency, practicality, resistance to external loads.

• installation requires making a hole in the wall from 25 to 31 cm in diameter;
• installation is only possible near an external wall;
• it is not possible to provide full-function control and protection of units and parts of the unit (for non-volatile models).

Despite the existing disadvantages, parapet boilers are highly rated by users. The demand for them is constantly growing.

Device

The design of the parapet unit almost completely replicates the design of any non-volatile boiler.

The coolant enters the primary (main) heat exchanger, where it receives high temperature and enters a three-way valve (mixing unit). In it, colder “return” is mixed into the hot liquid, as a result of which the temperature of the heating agent takes on the parameters specified by the mode.

In double-circuit models, before entering the three-way tap, the coolant passes through a secondary heat exchanger, where DHW is prepared.

The difference lies in the structure of the combustion chamber and chimney, which are not typical for such devices. To remove smoke, a coaxial double pipe is used, through the outer cavity of which Fresh air, and the inner one is a chimney.

Air is sucked into the closed combustion chamber and ensures the combustion process. When heated, it expands and displaces smoke and other gases produced when fuel is burned. Some models are equipped with two separate pipes, one of which supplies air and the other exhausts smoke.

This option allows you to enhance convection and stabilize the processes of gas movement.

Kinds

There are different design options for parapet boilers, which can be divided according to specific characteristics.

By installation method:

• wall-mounted Installed in a hinged manner on an external (load-bearing) wall. According to installation conditions, weight and power are limited;
• floor Installed on the floor. If it is wooden, a non-flammable stand is required. There are no restrictions on weight, dimensions and power.

By power supply method:

• volatile. The design contains components that require the use of electricity - a circulation pump. electronic control board, etc.;
• non-volatile. They work only with mechanical control. A good choice for remote villages and areas with power outages.

By feature set:

• single-circuit. Capable only of providing heating of the coolant;
• double-circuit. In parallel with heating, the heating agents are capable of preparing hot water for domestic needs.

NOTE!

Most users prefer single-circuit floor-standing models, which demonstrate the greatest efficiency.

Principle of operation

The operation of a parapet boiler differs little from the usual operation of gas convection units.

The burner heats the coolant, which transfers part of the energy to prepare DHW or is discharged into the heating circuit after preparation in a three-way tap.

There are no changes in this. A specific feature is the ability of the boiler to perform the function of a convector, which makes it possible not to install radiators in the room where the unit is located.

In addition, a special method of air supply and smoke exhaust is used. When the burner is ignited, a fire occurs in the upper part of the combustion chamber. overpressure air, causing it to be expelled along with the smoke outside.

At the same time, a vacuum is formed in the lower part, creating a suction of fresh flow through the outer part of the coaxial pipe. A pressure difference arises similar to that used in conventional ovens.

This allows the use of a closed combustion chamber without a turbo fan.

In some designs, the chimney and air intake pipe are made separately, but this does not change the principle of operation.

Rating of TOP 5 parapet gas boilers

Parapet boilers do not have many of the disadvantages of wall-mounted models, so their range is constantly increasing.

Let's look at the most popular models:

Lemax Patriot-12.5

Floor-standing non-volatile parapet boiler domestic production. The power of the unit is 12.5 kW. This is suitable for rooms up to 125 square meters. m.

Main characteristics of the unit:

• Efficiency - 87%;
• gas consumption - 0.75 m3/hour;
• dimensions - 595x740x360 mm;
• weight - 50 kg.

The boiler is single-circuit, but it is possible to connect an external boiler. This will allow you to get a full-fledged hot water supply line.

Lemax Patriot-20

Floor-mounted parapet boiler produced by the Taganrog plant. The power of the unit is 20 kW, so the size of the room should not exceed 200 sq. m.

Only the basic task is performed - heating the coolant. If you need to expand the functionality, you should purchase and connect an external storage boiler.

Boiler parameters:

• Efficiency - 87%;
• coolant temperature - 80°;
• system pressure - up to 2 Bar;
• gas consumption - 1.2 m3/hour;
• dimensions - 670x790x400 mm;
• weight - 67 kg.

Users and experts note low fuel consumption, which increases the efficiency of the unit and allows for significant savings.

Lemax Patriot-16

Another example of domestic heating technology. Parapet floor boiler 16 kW, intended for use in rooms up to 160 sq. m.

Like other models of the Patriot series, this is a single-circuit unit with a steel heat exchanger.

Its characteristics:

• Efficiency - 87%;
• coolant temperature - 80°;
• system pressure - up to 2 Bar;
• gas consumption - 0.95 m3/hour;
• dimensions - 670x790x400 mm;
• weight - 67 kg.

The Patriot series units with a power of 16 and 20 kW are the same design, only one of the models has artificially reduced performance.

Lemax Patriot-10

A product of engineers from Taganrog. A 10 kW parapet boiler is suitable for a country house or private house with an area of ​​up to 100 square meters. m.

• Efficiency - 87%;
• coolant temperature - 80°;
• system pressure - up to Bar;
• gas consumption - 0.6 m3/hour;
• dimensions - 595x740x360 mm;
• weight - 50 kg.

NOTE!

Reliability and low fuel consumption make Lemax Patriot parapet boilers the most good choice for all users.

ATON Compact 12.5E

Gas parapet boiler made in Ukraine. The power of the model is 12.5 kW, and the service area is up to 160 sq. m. Non-volatile unit designed for floor mounting.

Main parameters of the boiler:

• Efficiency - 90%;
• coolant temperature - 90°;
• system pressure - up to 1.5 Bar;
• gas consumption - 1.39 m3/hour;
• dimensions - 630x700x275 mm;
• weight - 50 kg.

The unit is equipped with a heat exchanger made of of stainless steel, has a protective gas valve.

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A parapet gas boiler is a device with a hermetically sealed combustion chamber, which is used to heat the coolant and water in DHW system. He carries out the fence clean air and removal of combustion products outside the premises, eliminating the release of carbon monoxide into the boiler room.

Features of the device

The body of such equipment has a rectangular shape, which adds convenience during installation, and the method of its mounting can be left, right or universal (double-sided).

The most popular are parapet boilers, whose power does not exceed 15 kW, although on the plumbing market there are more powerful samples designed for 35 kW or more.

Difference from analogues

At the time of development, boilers with convectors were conceived as a replacement for wall-mounted equipment for a similar purpose. After all, their predecessors require frequent maintenance, they are capricious and need high quality gas.

It is believed that the new kind heating equipment is less demanding to operate and does not require frequent maintenance. In addition, there is no connection to the chimney, which is a significant advantage and makes it possible to install it in any convenient room that has an external wall.

Installation location

In most cases, the parapet boiler is fixed in a niche under the window, where the radiator is usually placed. The main difference from wall-mounted and floor-mounted devices is the power range, installation method and output channel equipment. Currently, such a unit is a convector and a gas boiler at the same time, and can be installed not only in country houses, but also in apartment buildings.

The only thing worth remembering is that the device is completely energy dependent, because its operation will require a continuous supply of electricity. In this, it is completely similar to similar turbocharged devices designed to operate in a heating system with forced circulation of energy.

Device structure

Due to the design features and type of purpose, such devices have firmly occupied the niche of the most popular elements heating system. Their design allows the unit to be used universally in various conditions.

Outlines

Parapet boilers, like most of these units, can be single-circuit or double-circuit, so they do an excellent job of heating water for household needs where there is no hot water supply, and do this simultaneously with their main purpose.

Chimney

For normal functioning The device does not necessarily have a vertical chimney, since the process of removing combustion products is carried out through through hole in the wall.

Such a coaxial chimney consists of two pipes that are connected to each other. One of them is responsible for supplying oxygen, and the other for removing carbon monoxide to the outside.

Convector

The convector integrated into the boiler body allows you to do without the additional installation of radiators and other heating devices, if this does not upset the heat balance.

In order to create a comfortable indoor microclimate, you need to choose the right parapet boiler, having previously familiarized yourself with its technical characteristics.

Main advantages

Having familiarized yourself a little with the design features of the heating device and the scope of its application, you can determine the main advantages that it has:

• closed combustion chamber and, as a result, the possibility of installation anywhere;
• the presence of convection holes, thanks to which you can do without additional installation of convectors;
• power sources are gas and electricity, which means the device can be installed in city apartments;
• a large selection of models with a power range from 15 to 40 kW, which makes selection easier for rooms of different sizes;
• availability of single-circuit and double-circuit boilers;
• modern design that allows you to install the device in a visible place;
• low cost, making the boiler accessible to all segments of the population.

Right choice

Naturally, different models differ from each other technical parameters, which directly affect the advantages and disadvantages of the boiler.

Reliability

To judge the reliability of the device, it is necessary to find out how thick the steel of its body is. Unfortunately, some manufacturers neglect this rule and do not indicate this parameter on the heat exchanger packaging.

The optimal thickness of a steel wall is considered to be within three millimeters. If the thickness of the housing exceeds this value, heat exchange processes will be slowed down, which will certainly affect the comfortable heating of the room.

Along with the thickness of the metal, an indicator of its quality is very important, which can be determined by the level of permissible pressure specified by the manufacturer. Of course, the higher the indicator, the better and more durable the unit.

Economical

The efficiency of parapet boilers is evidenced by their design and operational efficiency. To find out how economical a heat exchanger will be, you need to find out its efficiency. It is this parameter that can best tell about the device’s ability to save energy resources.

Today, the vast majority of manufacturers strive to conquer the market, therefore they monitor the energy-saving qualities of their products. So, the optimal value of the coefficient useful action can be considered 90 - 93%.

Remember, this is the only indicator that will most accurately tell you about the effectiveness of the device. However, it is also necessary to take into account the characteristics of the heated room, its size and degree of thermal insulation.

Technical specifications

When choosing a heating boiler, you need to pay attention to its dimensions, power and placement of connectors and fasteners. All these indicators affect the installation process and the location of the boiler.

Carefully monitor the connection to the water supply and gas mains (left, right). This does not apply to devices with a universal (two-way) connection method.

The power indicator is hardly inferior in importance to the efficiency of the equipment. The thermal balance in the room and fuel economy will depend on the optimally selected parameter. If the power is excessive, you will be faced with excessive consumption of gas and electricity.

The average calculation looks like 1 kW per 10 m² of room, however, thermal insulation, wall material and other features of the building are not taken into account, so it is advisable to double the kW figure. This will neutralize negative action drafts, thin walls, dilapidated window frames.

Installation

Parapet boilers are installed according to the same principle as convectors. First of all in external wall create a hole with a small diameter to remove exhaust gases and take in oxygen.

It is best to arrange the output point next to the window, which will provide access to monitor its operating condition and, if necessary, carry out maintenance. There are a number of rules according to which installation work. They are quite simple and can be done with your own hands using the following steps:

• a coaxial chimney cuts in;
• the first air pipe is installed;
• the water pipe is connected;
• fastenings are tightened, installed heating device;
• a second pipe is installed;
• chimney sections are installed at an angle;
• sections are connected to the pipe;
• protection is installed, water supply pipes are installed, and an expansion tank is connected.

A parapet gas boiler is a unique heating device. The chamber in which the fuel burns is located outside the heated object, and the unit body is located indoors. This system eliminates the possibility of gases entering the house. Additionally, this makes the operation of the boiler more reliable, because the risk of breakdowns is reduced.

What is a parapet gas boiler

A parapet boiler is a device used to heat residential and public areas. This technique is popular due to its environmental friendliness. To make it work, there is no need to install a chimney on the roof, through which soot and fumes will be removed. Instead, a coaxial device is installed - this is a special “pipe-in-pipe” system, where waste is discharged through one hole, and oxygen is supplied through another.

Not long ago, installations were used as a replacement for wall-mounted models. The installation requirements are not so stringent, and the functioning of the entire system is stable. When wondering what it is - a heating parapet gas boiler, you can answer that it is a symbiosis between gas installation and a convector.

It's high efficient equipment, where the device layout does not affect the power indicator. Thanks to this, this technique is suitable for heating various objects. However, a parapet boiler is best suited for a small room. It could be:

• city ​​apartment;
• office;
• shop.

Despite the high efficiency, reaching 90%, these are fairly compact units that do not require high power.

Advantages

The positive qualities of the device are guaranteed only if you choose the right one. The following advantages are highlighted:

• parapet gas boilers are suitable for heating various objects, regardless of their purpose. Plus, you don't need to prepare special room where he will stand;
• Compared with traditional gas boilers, parapet boilers have a more affordable price;
• due to its compact size, there are no problems finding an installation location;
• relatively simple installation;
• Due to the design features, there is no need to use additional radiators for heating. The boiler itself is a functional heater;
• high functionality;
• It’s easy to select the power to suit the room parameters.

The only disadvantage of the unit is that some models are completely dependent on electricity.

Important! If there are power surges or network outages in your region of residence, it is recommended to purchase a generator.

Design and principle of operation

When considering a parapet heating boiler and what it is, first of all it is necessary to note the isolated, closed combustion chamber. This is done to increase the safety of the installation and to reduce oxygen combustion. The unit is easy to maintain, inexpensive to repair and is a combination best qualities gas and convector appliances.

The internal layout looks like this:

• steel body (when heated, it gives off heat, serving as a convector);
• burner;
• gas valve;
• hermetically sealed combustion chamber;
• flue (discharges carbon dioxide and takes in fresh air).

The heating device operates as follows. When switched on, the equipment ignites the pilot burner using piezo ignition. The gas then moves to the main burner, causing the heat exchanger to heat up. This element heats the coolant tank, which also plays a role in heating. Due to the installed automation, the boiler turns off the heating if the liquid temperature reaches +90 degrees Celsius. When the water cools, the device repeats the cycle. The set temperature is maintained automatically.

Important! If there are interruptions in the gas supply or its supply stops, the boiler turns off. If automation fails, equipment requires urgent repairs.

A coaxial chimney is provided to remove combustion products. Two pipes with different diameters are used: one removes waste, the second brings air necessary for combustion.

The units also differ in appearance. There are floor-mounted and wall-mounted models - this allows you to choose the appropriate boiler. Equipment power can be from 7 to 16 kW.

Note! There are dual-circuit models, in which the presence of a second circuit allows the preparation of hot water (DHW system).

Installation instructions

If you neglect the installation rules, your neighbors may begin to complain, because combustion products not only have an unpleasant odor, but are also very harmful to health. If certain rules are violated, the likelihood of technical failures increases. To correct problems, sometimes you have to reconnect the parapet boiler, and this is an additional expense.

• place - outer wall Houses. In this case, it is necessary to maintain a distance from the facade - from 0.3 to 3 meters (depending on the power of the selected device);
• the chimney outlet should not be located in a closed room, for example, an entrance, balcony or loggia;
• to increase fire safety, it is recommended to treat the part of the wall where the boiler will stand with non-flammable fire resistant material;
• equipment must not be installed nearby (minimum permissible distance is 0.2 meters) with upholstered furniture, carpets, curtains and other flammable items;
• there must be a working ventilation system in the room where the boiler is located;
• the required power depends on the volume of the heated object.

Some parapet boilers have an additional casing in which running water is heated.

Important! Thanks to convection holes in the body, the equipment is successfully used as an alternative to radiators.

Criterias of choice

To buy effective equipment, experts recommend adhering to the following tips:

• if the device will be used only for heating, a single-circuit model is sufficient. The double-circuit version allows you to prepare water for the hot water supply system;
• it is necessary to decide where the unit will be installed, since there are wall-mounted and floor-mounted types;
• The power of the installation plays a significant role. It should be taken into account that in double-circuit devices almost 30% is used to heat water;
• When purchasing, you need to visually evaluate the heat exchanger and make sure that its walls are thick enough. This determines how long the device will last and how effective it will be. Optimal thickness– no more than 3 mm;
• automation simplifies working with the device. Models without it have a low price, but are more difficult to manage;
• if the room is not thermally insulated enough, it is better to choose a device with high efficiency;
• The dimensions of the equipment are selected depending on the free space;
• The installation location is also affected by the type of boiler connection (left-handed, right-handed and universal).

Note! The parapet unit is suitable for both a private house and an apartment, and it is in no way inferior to standard gas installations.

The parapet boiler takes up very little space.

How to choose the right parapet boiler? Consumer reviews indicate the variety of models of this heating equipment. Today, the choice of device can be made according to the following parameters:

• by installation method: wall and floor, left-handed and right-handed;
• by number of circuits: single- and double-circuit;
• according to the presence of automation: volatile and non-volatile.

In addition, equipment is classified according to its performance. So, today you can buy a single-circuit gas parapet boiler with a capacity from 15 kW to 40 kW. When choosing a double-circuit parapet gas boiler and reading its instructions, you will notice that water capacity is also added to the usual power. Thus, a device with a power of 12 kW-13 kW can heat up to 180 liters of water per hour, which is enough for 4 water intake points.

Based on the number of circuits, they distinguish between single and double-circuit boilers. The first option is equipped with a conventional heat exchanger. It has a plate structure, which increases the speed of the heat exchange process between the gas burner flame and the coolant of the heating system. The heat exchanger is made of steel, 3 mm thick. Exactly this one structural material ensures equipment durability and sufficient high speed heat exchange. Increasing the thickness of the steel reduces the degree of exchange of thermal energy between the water in the heating circuit and the gas burner.

Parapet boiler design.

The double-circuit parapet gas boiler is equipped with an additional copper coil. Due to its operation, water is prepared for the hot water supply circuit of an apartment or house. Water heating is carried out only by flow method. The storage tank inside the boiler will significantly increase the dimensions of the equipment. Therefore, use it for installation in ordinary apartment will be impossible.

Dimensions and dimensions directly depend on the performance of the boiler and the number of circuits. Thus, a single-circuit gas parapet boiler will be smaller and lighter compared to a similar device equipped with two circuits. If you compare two single-circuit boilers, the one whose productivity is higher will be larger. This is due to the size of the gas burner and heat exchanger.

How does a parapet boiler work?

There is a coil inside.

The body of the parapet boiler is made of steel with a minimum thickness of 3 mm. Powder coated with outer and inner sides housing makes it resistant to corrosion. Even in conditions of high humidity, which is often observed in the kitchen, the gas heating element will retain decent appearance and integrity. Heavy-gauge steel increases the resistance of the device body to direct mechanical impact. There are no dents or paint chips on its surface.

Parapet device gas boiler is simple and effective. The equipment design is as follows:

• steel body;
• closed combustion chamber;
• igniter and gas-burner;
• coaxial chimney;
• steel heat exchanger, if this is a double-circuit equipment - a secondary copper coil.

The security system is presented:

• thermometer;
• thermocouple;
• traction sensor.

Floor-mounted parapet gas boilers do not differ in structure from their wall-mounted counterparts. The only difference is in the power of the equipment. With increasing power, the weight and dimensions of the device increase.

This video will help you understand the structure of a parapet boiler in more detail:

A parapet gas boiler can be installed in any convenient location in the building. The main requirement is that the equipment must be located close to the wall in order to lead the coaxial chimney to the street. The main advantage of parapet heating elements is a closed combustion chamber and a coaxial chimney. These two structural elements allow you to mount the device in any convenient place without fear for human health. After all, the sealed combustion chamber does not allow toxic gas oxidation products to penetrate into the living space.

The coaxial chimney is steel structure consisting of two pipes. One of them with a smaller diameter is located inside a pipe with a larger diameter. Between pipes various diameters free space is created. Through this space, wall-mounted and floor-mounted parapet gas boilers take in air for gas combustion. The oxidation products of the energy carrier come out into the street through the internal pipe. As a result of boiler operation, air is not drawn from the room. That is why parapet heating devices do not require a separate boiler room with good ventilation.

Installing a parapet gas boiler with your own hands is strictly prohibited. Installation of the device should only be carried out by specialists with the appropriate license. Only gas service employees should connect the device to the gas main.

Installation of a parapet boiler is carried out in the same way gas convector. The coaxial chimney is ducted outside through the wall. Wind protection is a must! Next, the installation of the flue pipes, heating circuit and water supply is carried out.

How does a boiler work?

Flow movement and names of structural elements.

If non-volatile equipment was purchased, then its operation begins with the piezo ignition button. As a result, the igniter or primary burner of the boiler begins to burn. If the equipment is volatile, that is, equipped with automation, it is put into operation using automation. However, non-volatile models are more common on the domestic market due to their versatility.

The operating principle of a parapet gas boiler is very simple. The pilot light ignites the main burner. Its flame is directed at the heat exchanger through which the heating circuit coolant circulates. The burner operates until the coolant temperature reaches the upper critical level. After this, the automatic heating element is activated. The gas valve is closed. As a result, the gas burner goes out, while the igniter continues to work. As soon as the temperature of the coolant in the heating circuit drops to the lower limit, the gas valve will resume the supply of energy to the burner. The latter will ignite from a working igniter. The water in the heat exchanger will begin to heat up again.

Several structural elements are responsible for the safe operation of the boiler:

• firstly, it is a thermocouple, which is located in the flame of a gas burner;
• secondly, the boilers are equipped with an element to control the presence of draft;
• thirdly, there is a thermostat with a thermometer.

Are you buying a parapet gas boiler? The instruction is the document on which the choice should be based. The instructions contain information regarding the power of the device, the rules for its installation and operation.

The thermocouple from the heat of the burner produces electricity little tension. It is fed to the gas valve and holds it in open position. If the flame inside the boiler goes out for some reason, the thermocouple stops producing electric current. The valve closes automatically. The gas supply stops.

Sectional view of a wall-mounted parapet gas boiler (rear view).

If there is no draft in the boiler, then the main structural element safety device(plate) – increases its temperature to +65°C. The signal from it goes to the gas supply valve. The latter closes and the gas burner stops working. A similar mechanism is typical for a non-volatile boiler. If the equipment is connected to the electrical network, then the traction control is controlled automatically.

A thermostat with a thermometer protects the boiler from overheating. As soon as the thermometer detects a critically high temperature of the coolant in the heating circuit, it transmits a signal to the thermostat. The latter also stops the gas supply to the gas burner.

The wall-mounted parapet gas boiler at one time was a worthy competitor to conventional wall-mounted ones. heating elements, despite their versatility. Thus, the latter were very demanding about the gas pressure in the gas pipeline; scale often formed on their heat exchanger; they needed uninterruptible power supply. Parapet devices are not so demanding on the pressure in the gas pipeline. Non-volatile models do not require power. Their coaxial chimney can be mounted both vertically and horizontally, which expands the possibilities of their installation.

Possible problems with gas equipment of this type

Ice formation on the chimney.

Parapet gas boilers for heating can create several problems for their owners. First, their sealed chamber consists of two structural elements that are connected to each other by a porous, thermally resistant polymer-based material. If Maintenance the boiler is carried out at the wrong time, you may not notice how the thermoplastic will lose its tightness. Carbon monoxide and other toxic components of exhaust gas can enter the living space and cause poisoning. That is why timely maintenance of parapet boilers is mandatory.

Secondly, the coaxial chimney in inexpensive models made from standard steel grades. At the same time, operating rules gas equipment require the use of only stainless steel when creating chimneys. Otherwise, soot and condensation accumulating on the chimney walls can form a chemically active environment.

It eats through steel walls. Carbon monoxide from inner pipe enters the air flow going to the gas burner. As a result, there is not enough oxygen in the gas chamber for complete combustion of the energy carrier. Equipment performance decreases. Soot forms on the boiler walls, which accelerates corrosion processes.

Thirdly, with a coaxial chimney there is always the danger of the burner flame being blown out by strong gusts of wind. That is why, when installing the device, it is mandatory to install protection against the wind.

How justified is the use of parapet boilers?

A parapet boiler can be placed on the floor, directly in front of the radiator.

Parapet boilers today can compete with similar full-fledged gas-fired heating devices. After all, parapet equipment is compact in size and dimensions, and is not inferior to conventional boilers in terms of performance. The main advantage of parapet devices is the presence of a closed combustion chamber and a coaxial chimney. This allows you to place the device in living rooms. The chimney can be positioned both vertically and horizontally, which gives even more freedom in terms of placement of heating equipment.

The equipment can operate both as a heating boiler and in parallel as a conventional convector. In addition, the equipment is capable of servicing the DHW circuit. The advantages of the equipment include their durability, efficiency, long service life, and safety in use. The quality of the last parameter is controlled by a thermocouple, control of draft and coolant temperature. TO possible problems relate low quality coaxial pipe, untimely maintenance, blowing out the burner flame with strong gusts of wind.

Not all owners have any idea what a parapet gas boiler is, although many have been using it for a long time. This is a non-volatile unit, without connection to the chimney of a house or apartment. A gas parapet boiler removes combustion products through a coaxial chimney passed through the wall of the building. The presence of a closed fuel (gas) combustion chamber makes possible installation such units in small spaces, since oxygen is not taken from the room for the gas combustion process.

Advantages and features of parapet units

The main advantage of the equipment is its compactness: a parapet boiler running on gas can easily fit in the kitchen under a window sill or in any other room, since during operation it does not consume oxygen from the room and does not pose a danger to residents. A coaxial chimney is a reliable and safe smoke removal system, which also offers a choice in favor of such equipment.

The correct choice of product should be based on the following parameters (except for consumer reviews and catalogs from selling companies):

1. Installation technology: the parapet boiler is made for mounting on walls and floors; there are also left- and right-hand models;
2. A gas parapet boiler can be equipped with one or two circuits. One circuit is for heating only, the second circuit is for domestic hot water;
3. Also, parapet boilers can be energy-dependent (with automatic system monitoring, adjustment and control) and non-volatile (with or without manual adjustment).

The thermal power possessed by parapet boilers varies between 15 kW-40 kW for a unit with one circuit. If you choose to install parapet equipment with two water heating circuits, then the capacity for heating water for domestic needs should also be added to the rated power. For example, parapet boilers with a power of 12 kW -15 kW easily heat the volume of water up to 180 l/h, which, according to the standards, is four water points (faucets, toilets, faucets, showers, etc.).

1. The single-circuit unit has a standard heat exchanger (jacket) of a plate design, which speeds up the process of heat exchange between the gas burner and the working fluid of the heating system. The material of the shirt is thick 3 mm steel.
2. Double-circuit gas parapet boilers contain, in addition to the heat exchanger, a copper or brass coil for hot water supply, in which water is heated only by the flow method. If you increase the productivity of hot water supply due to an additional tank for hot water, then such a boiler will no longer be able to be installed in the kitchen.

Also, in addition to wall and floor models, there are products with a difference in installation: with left-hand connection gas pipe, hot water supply and heating circuits, and right-handed. This convenience should not be overlooked when choosing a boiler for an apartment or house. The dimensions of the unit are determined by its performance and the number of water heating circuits. For example, if a boiler has one circuit, then its dimensions will be smaller than that of a double-circuit one.

Parapet equipment installation

The body of the unit is painted with powder fireproof anti-corrosion paint, which, for working conditions in the kitchen, protects against the effects of high humidity and rusting of the metal. The thick 3-mm casing (not a casing, but the casing of the working unit) is resistant to mechanical stress.

The equipment is simple but effective:

1. Thick-walled metal case;
2. Closed combustion chamber;
3. Gas burner and ignition;
4. Chimney of coaxial type;
5. Metal jacket (heat exchanger), if there is a second circuit - copper or brass coil.

Automatic monitoring and control group:

1. Thermometer;
2. Thermocouple (temperature sensor);
3. Air draft sensor.

Self-installation parapet equipment is impossible - this must be done by representatives of the gas service after the owner has received the appropriate permits. The unit can be installed anywhere. The main thing is that the boiler should be located next to the wall - this way the coaxial chimney will be short and safer. The main advantage of parapet gas boilers is a closed combustion chamber and a coaxial chimney pipe, which can be installed anywhere in the room. These two components allow the boiler to be installed anywhere in the room, without fear for the safety and health of the residents, since neither the sealed closed combustion chamber nor the autonomous chimney allows toxic gases to enter the atmosphere of residential premises.

The chimney pipe of a coaxial device is metal structure from two pipes different diameters. A pipe of a smaller diameter is inserted into a pipe of a larger diameter, and the free space between them serves to draw air into the combustion chamber. Through the pipe with smaller diameter combustion products are discharged outside.

Self-installation of a parapet gas boiler with your own hands is strictly prohibited. Installation and commissioning of gas equipment must be carried out by licensed professionals, and only employees of the regional gas service have the right to connect a parapet gas boiler to the gas main.

The installation process of gas parapet equipment is similar to the installation gas convector: the smoke removal system of a coaxial chimney is discharged through the wall of a house or apartment to the street, while the end of the pipe must be protected with a windproof cap to prevent the blast strong wind did not extinguish the wick. Then the gas, heating and hot water circuit pipes are installed in the same way.

How the boiler works

The non-volatile gas boiler is equipped with piezoelectric ignition - for this there is a special button on its body. The wick lights up and ignites the gas burner.

When an automation system is installed in the equipment, the boiler is ignited automatically, depending on the sensor readings. More reliable, versatile and easy to operate are energy-independent models of gas parapet boilers, which is why they are more popular in the domestic market.

Parapet gas equipment operates using a simple and understandable technology: the gas burner of the boiler is ignited from the wick and heats the heat exchanger, through which, using circulation pump or natural current moves the working fluid. The gas will burn until the water temperature in the heating system reaches the level set by manual or automatic regulators, after which the gas is automatically turned off by closing the gas valve at the inlet to the boiler. The wick is working at this time and is ready to re-ignite the burner at any time as soon as the water temperature in the system drops below the specified parameters and a command to heat up is received.

The gas boiler safety group consists of the following components and elements:

1. Thermocouple, which is installed directly in the burner flame;
2. The traction control sensor is installed at the combustion chamber outlet;
3. Temperature sensor and thermometer.

What is a thermocouple used for: under the influence of heat from the burner flame, it generates a small voltage that controls the position of the gas valve. If combustion in the chamber stops, the voltage in the thermocouple disappears and the valve automatically closes, cutting off the flow of gas into the boiler.

In the absence of air draft in the boiler, the heat exchanger quickly heats up to +65°C and above. The signal from the heat exchanger plate is sent to the gas supply valve, it closes and combustion ends. This is how the safety group of a non-volatile boiler works. If the boiler is connected to the electrical network, then all processes are controlled by a control and automation system.

A thermometer paired with a temperature sensor (thermostat) serves to protect the parapet boiler from elevated temperatures. The mechanism works like this: when the thermometer detects a critically high temperature of the working fluid in the system, it sends a command to the thermostat, which closes the gas supply to the boiler burner.

Wall-mounted parapet gas equipment is in even greater demand than conventional floor standing boilers with a chimney installed in the building due to its versatility and undemanding operating parameters. For example, conventional wall-mounted units react sensitively to changes in gas pressure in the line; because of this, scale appears on the boiler jacket more often; in addition, such units require an uninterrupted supply of electricity.

Parapet gas boilers are less sensitive to pressure changes in gas supply pipes, and non-volatile equipment does not require connection to the electrical network at all. A coaxial type chimney is undemanding in terms of installation conditions: it can be installed both horizontally and vertically, which gives scope for a more convenient location of the boiler in small rooms.

Problems and solutions with parapet gas equipment

Despite all the safety measures provided and control over the operation of gas equipment, parapet units can create problems:

1. The closed combustion chamber is made of two elements connected to each other polymer materials. If the schedule is not followed preventative work the polymer layer may begin to deteriorate. , which will lead to the leakage of toxic combustion products into residential premises;
2. The material of coaxial chimney pipes in cheap models of parapet units can be made of black steel, which quickly burns out. Remember one mandatory GOST requirement: in all models of gas parapet boilers, the coaxial chimney must be made only of stainless steel. If the pipes are made of ordinary steel, then soot and condensation quickly accumulate on them, air draft slows down, corrosion eats away at the metal, and all toxins can easily enter the room. Besides, carbon monoxide from the chimney, entering the combustion chamber through the cracks of the chimney, can extinguish the burner or reduce the strength of its combustion;
3. With the walls of a coaxial chimney damaged by corrosion, the danger of the flame being blown out by gusts of wind increases significantly, which means that the gas in pure form will seep into living spaces. This means only one thing - wind protection of the chimney is mandatory, as is checking the material from which the parapet pipe is made.