What are the parapet gas boilers and what are their advantages

Gas boilers are essential for effectively and efficiently heating homes, particularly in areas with natural gas availability. The parapet gas boiler is one heating system option that is becoming more and more popular. However, what precisely are parapet gas boilers, and why are they gaining popularity among homeowners?

A type of wall-mounted boiler called a parapet gas boiler is intended to be placed on a building’s exterior wall, usually close to the roofline. Parapet boilers are space-saving options that optimize interior space while delivering effective heating, in contrast to conventional floor-standing boilers, which occupy valuable floor space. These boilers are small and sleek, fitting in perfectly with the building’s design.

The great energy efficiency of parapet gas boilers is one of their main benefits. These boilers are designed to minimize energy consumption and provide outstanding heating performance, which lowers utility costs and lessens the boiler’s environmental effect for homeowners. Even in the coldest months of the year, parapet boilers use natural gas to provide steady warmth throughout the house.

The adaptability and ease of installation of parapet gas boilers is another important advantage. Complex ductwork or dedicated indoor space is not necessary for parapet boilers because they are mounted on the exterior wall. They are therefore perfect for both brand-new building projects and home renovations. Furthermore, because of their modular design, which makes expansion and upgrades simple, homeowners can easily customize their heating solutions to meet their unique needs.

Parapet Gas Boilers Advantages
Compact and space-saving design Efficient heating performance
Installed on the wall, freeing up floor space Cost-effective operation


Gas parapet boilers are extremely sensitive to proper system installation, which is in charge of removing smoke—a byproduct of fuel processing—and supplying oxygen on schedule.

From this vantage point, the entire range of boilers can be separated into just two categories:

  • Those in which a natural draught is used;
  • and those with forced draught.

It is evident that in the first instance, a special chimney that rises to the roof surface is used to expel smoke from the room. Air from the room itself is used to feed the system; these boilers are known as open gas parapet boilers. A good ventilation system is especially crucial in this situation since it will continuously supply the space with fresh air.

Gas boiler chimney installation schematics

Additionally, "coaxial pipes," which are conducted inside the room’s walls, are used to create a forced draught. The most common application of forced draught is in the heating of boilers, which have larger capacity specialized fans that remove combustion products via coaxial passages.

A coaxial pipe is used to supply air when using closed-type heating parapet boilers, which force out smoke. Actually, the two pipes we are discussing have different diameters. One pipe is placed inside the other, smaller pipe inside larger pipe. The smoke exits the room through a chimney with a small diameter. Additionally, fresh air enters the combustion chamber through the gap created by the diameter difference.

As a result, it is reasonable to draw the conclusion that gas parapet boilers, which have this kind of smoke exhaust system, are less dangerous for people nearby because oxygen from the outside environment powers the combustion process. The room’s atmosphere is unaffected in the meantime.

The ability to use a horizontal arrangement of coaxial pipes in the event of a forced draft (as opposed to only a vertical arrangement in the case of a natural draught) and the ease with which the unit can be installed are two benefits of gas parapet boilers.

Choice of gas boiler

In addition to their technical attributes and power, parapet boilers can vary from one another in terms of economy and dependability.

The heat exchanger’s design’s steel thickness has a major impact on reliability. Since this parameter can be crucial to the functioning of the parapet boiler, it is unfortunate that not all manufacturers specify it. As such, you should separately clarify this point with the seller when selecting a boiler.

Three millimeters or less is thought to be the ideal steel thickness. A thicker steel will cause the heat exchange process to slow down, which will reduce the room’s overall heating efficiency. Apart from its thickness, the quality of the steel holds significant importance. The maximum pressure level that the manufacturer permits can be used to determine the quality of the metal and the boiler as a whole. The chosen parapet boiler is made with greater quality and reliability the higher it is.

The highest pressure level at which metal can be manufactured can be used to determine the metal’s quality.

The heat exchanger’s efficiency and design have an impact on the parapet boiler’s efficiency. Finding the efficiency (efficiency factor) of the chosen boiler is necessary to ascertain how cost-effective it will be to operate; this parameter will most precisely reflect the efficiency of the heat exchanger and the boiler device as a whole.

Almost all manufacturers have so far attained a 90–92% acceptable efficiency level. However, it might be helpful to clarify the efficiency level when making a purchase, as two or three percent can make a difference in some circumstances. Since each room has a different level of thermal insulation, feedback from those who have already purchased a boiler will always be subjective, this indicator is the only one that will accurately reflect the boiler’s efficiency.

Important technical parameters are boiler dimensions, size, and the location of power and connection connectors. Size and dimensions are selected specifically for each instance, taking into account the installation location and circumstances. The boiler also depends on the placement of connectors. There are models in the current range that can connect the boiler to the gas and water supply from both the right and left side. Additionally, there are universal models that support side-to-side connections.

The size of a boiler varies depending on its capacity.

The efficiency and power of the parapet boiler are equally significant features. The best model to choose will rely on how well the room is heated as well as how efficiently the boiler is used; if the boiler is too powerful, gas and electricity will be wasted.

The commonly used formula, 1 kW per 10 m2, is actually incorrect because this indicator is averaged so much that it rarely matches reality. The difference between the apartment and the house, the number of windows in the space, the type of wall material, the height of the ceiling, and other elements that contribute to the total amount of thermal insulation are not taken into consideration when calculating the power of 1 kW per 10 m2.

It is recommended to use twice this formula, or two kW of power per 10 m^2, rather than one. In this instance, a reserve is determined by accounting for the room’s windows, potential draughts, thin walls, and high ceilings. Of course, the best way to get the most for your money and the highest possible heating quality is to speak with professionals before making a purchase and figure out the ideal boiler output on your own.

Being both a furnace and a convector at the same time, the parabolic boiler is affordable, simple to use, easy to maintain, and can serve as a water heater without the need to build an additional heating network. You can connect the parapet boiler on your own without the assistance of experts thanks to its ease of installation.

In summary, the parapet boiler is a practical contemporary heating appliance that can be installed in a variety of locations, including private homes, apartments, garages, and outbuildings.

What is essential to know?

Installation of floor and parapet boiler

The inclusion of unique legs or transportation wheels ensures ease of installation and delivery. They therefore don’t create problems. Additionally, these models are sold assembled, which simplifies the work for experts. The greatest substitute for floor and wall models is a parapet unit. Two-room apartments can have independent heating thanks to its energy-independent heat generator.

It is important to keep in mind that there are some boiler models that do not always meet the specified specifications, known as exceptions. Furthermore, heating a wooden room is not always possible according to the requirements and specifications.

Boiler installation is not an inexpensive process. This is mostly because of how complicated the mechanism is, how accountable the employees are, and how only authorized specialists can be called in order to connect. It is against the law to handle the installation on your own, so you are unable to save money. The cost for such a treat will range from $300 to 650 dollars, depending on the type of boiler and the complexity of the connection.

This price covers setup, delivery, parts procurement, filling the system with water, verifying all specifications, safety, and startup.

The right choice

Naturally, the technical specifications of various models vary from one another, which has an impact on the boiler’s benefits and drawbacks.


The thickness of the device’s body steel must be determined in order to assess its dependability. Regretfully, some manufacturers disregard this guideline and fail to list this parameter on the heat exchanger’s packaging.

It is believed that the ideal steel wall thickness is a parameter that is within three millimeters. Heat exchange processes will be slowed down if body thickness exceeds this threshold, which will undoubtedly affect the room’s ability to be heated comfortably.

In addition to the metal’s thickness, another crucial criterion for quality assessment is the manufacturer’s specified maximum allowable pressure. Naturally, a unit is more qualitative and long-lasting the higher the indicator.


The efficiency of parapet boilers’ design and operation is a good indicator of their economy. The efficiency factor of a heat exchanger must be determined in order to determine how cost-effective it will be. This particular parameter has the greatest ability to inform you about the device’s energy-saving capabilities.

The vast majority of manufacturers nowadays are vying for customers, so they keep an eye on how energy-efficient their products are. Thus, between 90 and 93% can be thought of as the ideal efficiency value.

Recall that this is the sole indication that can provide you with the most accurate information regarding the device’s efficiency. Nevertheless, you also need to consider the heated room’s dimensions and level of thermal insulation.

Technical parameters

You should consider a heating boiler’s size, power, and where its fasteners and connectors are located. Each of these indicators has an impact on the boiler’s location and installation procedure.

Pay close attention to how the gas and water main connections are made (left, right). Devices that have a universal (two-sided) connection method are exempt from this.


The equipment’s efficiency is far more important than the power indicator in terms of significance. The best choice of parameter will determine the room’s heat balance and fuel efficiency.

If the capacity is too large, you will use too much gas and electricity.

The average calculation appears to be 1 kW per 10 m² of space, but it ignores other building features, wall composition, and thermal insulation, so it is preferable to double the kW value. Thus, the detrimental effects of drafts, thin walls, and broken window frames will be mitigated.

Types, technical characteristics, device and principle of operation

Danko’s device, the parapet gas boiler

First, let’s describe the layout of the parapet gas boiler in detail:

  1. Steel casing.
  2. Closed combustion chamber.
  3. Gas burner with igniter.
  4. Coaxial chimney.
  5. Steel heat exchanger or copper secondary coil.

In addition, the protection system comprises a draught sensor, thermocouple, and thermometer.

This kind of boiler can be assembled and installed anywhere in the structure. The only requirement was that it had to be close to the wall in order to allow the coaxial chimney to lead outside.

Two pipes form the structure made of steel. Inside the larger-diameter pipe is the smaller-diameter pipe. Additionally, a gap is created between the tubes, through which air is drawn for gas combustion in wall and floor boilers. The energy carrier’s oxidation products are released through a tiny pipe to the outside. Coaxial chimney

One major benefit of gas parapet boilers is that air is not drawn from the rooms because of the coaxial chimney.

Operation of a parapet gas boiler scheme

The piezo ignition button initiates operation in the energy-independent design. The igniter or the boiler’s main burner ignites when it is pressed.

Naturally, automation also starts the equipment if it is energy-independently equipped with automation. Energy-independent boilers on the domestic market are valued for their versatility.

What is the purpose of the gas boiler automation and how does it operate?

Let’s now discuss the various kinds of parapet gas boilers. They differ from each other in that

  • functionality;
  • price;
  • used fuel carrier;
  • type of burner;
  • place of installation;
  • capacity;
  • Smoke extraction principle;
  • the presence of an automatic control unit;
  • dependence on electricity.

However, the primary distinction (which actually depends on the boiler’s primary parameters) is in how the parapet gas boiler is installed.

And the first typology can already be distinguished.

Parapet gas boilers can be classified into the following types based on how they are installed:

  • floor standing;
  • wall-mounted;
  • right-handed;
  • left-handed.

It is strictly forbidden to independently assemble this kind of boiler. These are handled by gas service personnel and specialists who hold the necessary licenses.

Gas boilers with floor parapets are not less efficient than equivalent wall-mounted boilers. The equipment’s power is the only distinction. The device will correspondingly be larger and heavier the more power it has.

In light of the existence of automation, differentiate:

  • Non-independent;
  • energy-dependent parapet boilers.

Remote-control gas boiler for a parapet

It is evident that energy-dependent people rely on the availability of energy for their work. However, the first are more frequently placed in homes where power outages are a possibility, which is a common occurrence in today’s world. They are therefore fairly common.

One benefit of energy-independent boilers is that their operation duration, combustion intensity, and piezo ignition can all be adjusted. They are capable of operating in the system with low gas pressure. Some models come with a remote control that lets you operate the boiler from a distance.

You can read more at about the characteristics of gas boilers that don’t use energy.

If you plan to purchase a parapet gas boiler, carefully read the manual. Based on the information in this document regarding the device’s capacity, installation instructions, and operating guidelines, the decision should be made.

A distinction is made based on the quantity of circuits:

  • single-circuit;
  • two-circuit parapet gas boiler.

A traditional heat exchanger and a plate structure are features of the single-circuit, which facilitates quicker heat exchange between the coolant and the heat burner’s flame. Three millimeters of steel make up the heat exchanger. This material offers a quick thermal energy exchange and increases the equipment’s durability. The amount of heat exchange between the water and the gas burner decreases with increasing steel thickness.

Water is prepared for the hot water circuit of the house or apartment by the copper coil in the set of two-circuit parapet gas boilers. Only flowing water can heat water. It is impractical to use the equipment for installation in a typical apartment because the internal tank will greatly expand due to accumulation.

How the boiler functions

The piezoelectric ignition system of a non-independent gas boiler is activated by pressing a dedicated button located on its body. The gas burner is lit and ignited by the wick.

The boiler is started automatically when an automation system is installed in the machinery, based on sensor readings. Gas parapet boilers with non-volatile models are more favored in the home market because they are more dependable, adaptable, and simple to use.

Energy-efficient parapet boiler device

Simple and straightforward technology powers the perimeter gas equipment. The wick heats the boiler’s gas burner, which in turn heats the heat exchanger, which then transfers the working fluid using either a natural current or a circulation pump. The gas is automatically turned off by shutting the gas valve at the boiler inlet once the water temperature in the heating system reaches the desired level as determined by manual or automatic regulators. Currently in operation, the wick is prepared to relight the burner whenever the system’s water temperature falls below predetermined limits and the heating command is received.

The gas boiler’s safety group is made up of the following components and assemblies:

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

The heating system and parapet boiler safety group

The purpose of the thermocouple is to regulate the position of the gas valve by producing a tiny voltage when heated by the burner flame. When the combustion in the chamber is stopped, the thermocouple’s voltage drops, causing the valve to automatically close and shut off the boiler’s gas supply.

When the boiler’s air draught is absent, the heat exchanger heats up fast to +65°C and above. When the gas supply valve receives a signal from the heat exchanger plate, it closes, stopping the combustion. The operation of an energy-independent boiler’s safety group is as follows. All operations are managed by the control and automation system if the boiler is linked to the electrical grid.

The parapet boiler is shielded from elevated temperatures by a pair of thermometers equipped with thermosensors (thermostats). The mechanism is as follows: the thermometer commands the thermostat to cut off the gas supply to the boiler burner when it senses a dangerously high working fluid temperature in the system.

Automation control and sensors

Because of its adaptability and low operating parameters, wall-mounted parapet gas equipment is even more in demand than traditional floor-standing boilers with a building chimney. Conventional wall-mounted units, for instance, are more susceptible to variations in mains gas pressure, which leads to more frequent scaling of the boiler jacket. These units also need a constant supply of electricity.

Energy-independent equipment doesn’t need to be connected to the power grid at all, and gas-powered perimeter boilers are less susceptible to pressure drops in the gas supply pipes. Because coaxial chimneys can be installed both horizontally and vertically, they provide more room for boiler placement that is more convenient in small spaces.

Make sure to perform routine maintenance.

Advantages of two-circuit parapet boilers

Benefits of boilers with two circuit parapets

  • small size and overall compactness of the equipment;
  • can be located in any room, even in the kitchen;
  • Convenience of installation: under the window sill or above the table;
  • Coaxial pipes for easy smoke extraction.

Wall-mounted parapet models

Installing a gas heating boiler is relatively simple, particularly if it is a wall-mounted model. In contrast to floor-standing models, they don’t require a room that is specifically designed to meet gas inspector requirements. Furthermore, a ventilation hole and a regular vent will suffice for their installation in place of a chimney outlet. There’s no need to construct an intricate chimney system, find enough room for the boiler, or adhere to stringent regulations.

Wall-mounted models also have the benefit of being able to be connected anywhere in the system. A beautiful appearance won’t detract from the overall design of the space; instead, it will only make the kitchen or bathroom cozier.

Boilers that are mounted on walls have an automated control system. They also don’t require radiators where they are installed because they have a piezoelectric ignition system.

How to carry out the installation

The boiler is placed in a non-residential space, usually the hallway or kitchen. The unit needs to be placed up against an exterior wall, which needs to be constructed or covered in non-combustible material from the interior. The recommended minimum distance between furniture, textiles, and other combustible materials and the boiler is 20 cm. Here are a few more crucial guidelines:

  • lead out the chimney pipe can only be on the street, the output on a glazed loggia or in the entrance is prohibited;
  • in the room where it is planned to install the unit, there must be good ventilation.

It should be mentioned that installing a heating boiler is a simple task that you can complete with just your hands. There are multiple stages to the work’s completion:

  • the place for boiler installation is chosen;
  • a hole is punched in the wall, which is slightly larger in diameter than the diameter of the chimney pipe;
  • an adapter is installed in the wall – a special feed-through fitting;
  • chimney is assembled;
  • a section of water pipe is installed (for two-circuit models);
  • The boiler is installed, the fasteners are fixed;
  • The chimney is connected to the outlet of the boiler;
  • pipes are connected for the supply of coolant, an expansion tank is installed.

Thus, parapet boilers are contemporary heating units featuring a sealed furnace. These design features allow for the installation of these heating units even in individual apartments within apartment buildings, as well as the option to use a coaxial chimney led into the wall. Despite their small size, boilers are known for their high design reliability, efficiency, and economical fuel consumption. The equipment is reasonably priced and has an easy-to-use interface.

Pros and cons of gas parapet boilers

Boilers with parapet walls have benefits and drawbacks. Knowing precisely why a gas unit is being purchased and where it will be placed is crucial when selecting one. As a result, future repair costs resulting from subpar heat-generating equipment will be avoided.

As you install and use it, keep the following benefits in mind:

  • Compact size, can be placed on the wall and will not take up useful space.
  • The system, enclosed in a coaxial pipe, is very convenient and easy to install.
  • Installation requirements are minimal, for wall mounting there are no requirements, for floor mounting – a vent and a doorway of at least 80 cm.
  • Unit can be installed with your own hands, there are no installation requirements.
  • Strict and modern design can fit into any interior, the paint does not burn out and is easy to clean.
  • Automation and temperature and pressure sensors make the boiler very safe.
  • In the room where the gas boiler is located, It is not necessary to put radiators, as the body is heated during operation.

The energy dependence and small capacity of the parapet unit are its drawbacks; gas units are typically installed in smaller homes or apartments.

When it comes to home insulation and heating, parapet gas boilers are a dependable and effective choice. Because they are wall-mounted and small, these boilers conserve valuable floor space in homes. Because of their simple installation and upkeep, they are well-liked by homeowners searching for hassle-free heating options. The energy efficiency of parapet gas boilers is one of their main benefits; it lowers heating expenses while maintaining a cozy and warm home environment. They also provide fast heat distribution throughout the house and accurate temperature control. For those looking for cost-effective home heating options, parapet gas boilers are a wise choice due to their small size, efficiency, and convenience.

Parapet boiler.

My construction is a little behind schedule. At night, we already have a little disadvantage. Because of the chimney, there is not enough time to construct a heating system using a basic floor-standing boiler. Of course, stainless steel pipes are an option, but for the time being, chimney mounts will not fit well against the damp walls of Arbolite. It was here that I discovered the boilers referred to as parapets. There isn’t a chimney (between 250 and 530 mm), but they report that blowing out is an issue.

Generally speaking, I have a few inquiries.1. I want the same gas two-circuit boiler that uses no energy (with hot water). Please share if you have any operating experience. The benefits and drawbacks of this boiler. 2. Considering the above information, how can one escape with heating in the winter if all of the parapet boilers are hemorrhoids?

Researcher Slava 61, Taganrog, South Russia. 10199 2834

Rewrite: 1 05 Oct 13, 22:12, 12 minutes

The benefits and drawbacks of this boiler. Goodwin, October 5, 13:01 Like two things in one, it’s always bad. Decide whether to heat the house with the boiler and use column water for washing. It’s not good to have two in one. As soon as possible, brick up the asbestos cement pipes by installing them, strengthening them, and sinking them. They will, however, weep this winter, drill a condensate hole, and place a bucket. Due to a two-in-one situation, there is no hot water, the boiler is standing, and the water circuit is not functioning. I hope that makes sense.

Yefim L. N. R687 219, Doctor of Sciences

In 8 minutes, on October 5, 13, 22:19, reply no. 2

Blowing parapetnogo is as common as chimney fires, which can be prevented by using a variety of tools, such as covering the "fungus" with a shield or zatting it from the leeward side. The fungus cap on the chimney can frequently be removed or approximated to solve the issue. What kind of two-circuit is a non-independent one? Any energy-dependent system if it has its own pump and fan and is connected via coaxial pipe.

Posted by Yefim on October 13, 22:21, red. 05

Rewrite: 3.05. Oct. 13, 22:22, 3 minutes

Yes, it’s evident that it is evident in this case. The only option that isn’t an ace is the one with the gas column. Consequently, two chimneys are required. The option with the two-circuit floor is charming because it does not have an ostentatious and lengthy chimney. I’m willing to put up with a few minor hot water inconveniences for one heating season, since I’ll build a chimney and ventilation system during the next building season, and if the parapetnik isn’t up to par, I’ll replace it with a basic floor + gas column. I’ll just buy a gas heater and call it a day if the boiler functions properly.

Yefim L. N. R687 219, Doctor of Sciences

Oct. 13, 22:25, in 4 minutes: OTV.4 05

In the event that the parallel is two-circuit, the minimum amount of power required is 16 kwt; for circuits up to 16, the second circuit is essentially self-sufficient.

Rewrite: 5 05 Oct 13, 22:26, 2 min

Blowing parapets are just as common as chimneys, and they can be removed by using a variety of devices, like covering the "fungus" with a shield or notifying it from the leeward side, among others. Removing or roughly approximating the pipe’s fungus cap can often solve the issue. What kind of two-circuit boiler, non-independent is it? Any energy-dependent system if it has its own pump and fan and is connected via coaxial pipe. efim, October 5, 13:19 No, no. Completely non-volatile, meaning it doesn’t have any pumps or other devices that run on 220 volts. Okay, so this is one like

Yefim, L N R687 219, Doctor of Sciences

Rev. 6 05 October 13, 22:30, 4 minutes

It won’t require an extra pump to get through. It is imperative to examine both the output dimeter and the minimum inch-diameter pipe on the supply.

Posle. ed. 05 by Yefim, Oct. 13, 22:33

Mounting the apparatus

Proper installation of parapet gas boilers, whether single- or dual-circuit, requires specific knowledge and consideration of numerous factors. Only then will the intended outcome be realized and the accident risk be decreased.

Choosing and buying

It is essential to give careful consideration to the device’s selection and purchase in order to guarantee optimal performance. You must select the best model from a wide range of options in order to heat your living area while consuming the least amount of fuel.

Fundamental standards for selecting a parapet boiler:

  1. Material from which the appliance is made. The ideal option will be to buy a device, the body of which is made of steel sheets with a thickness of 4 mm.
  2. Main characteristics of steel quality. The boiler must withstand a lot of pressure, so you need to choose a material that has high strength and durability.
  3. The efficiency of the boiler. When buying a boiler, it is important to take into account this parameter, since it will depend on the amount of fuel (natural gas) costs.
  4. Location of the connectors. The way of connecting the device to the gas and water pipe depends on this factor.
  5. Dimensions. It is important that the boiler fits in a certain place in the room and does not interfere with movement in it. In addition, the size of the appliance affects its capacity.
  6. Estimated capacity. Most often this indicator is determined based on the area of the heated room. For every 10 square meters will need at least 1 kW of heat energy.

Whether to use a double- or single-circuit boiler to heat the DHW

Preparatory measures

There are a few crucial preparatory steps that must be taken before installing a parapet boiler. They make it feasible to expedite the work and streamline the installation procedure.

Necessary Step:

  1. Sign a contract for individual natural gas supply.
  2. Contact the gas utility to coordinate all specifications.
  3. Installation work should be carried out only by highly qualified specialists with extensive experience.
  4. After connecting the device, it is necessary to obtain a document that confirms its compliance with all norms and safety requirements.
  5. The heating system must be pressurized.
  6. The walls in the room where the heater is located must not be made of flammable material.
  7. All connections between the boiler and other elements must be fully sealed.
  8. A voltage stabilizer and an uninterruptible power supply must be installed before connecting the appliance to the power supply system. These two devices will help to avoid breakdowns and accidents.
  9. It is important to take care that no antifreeze gets into the heated water. Otherwise, gas leakage and damage to individual parts of the structure may occur.

Boiler with two or one circuit

Basic requirements

You must adhere to the fundamental installation requirements in order to guarantee that there are no issues when using the device. They will assist in avoiding the majority of errors and stop unanticipated events from happening.

Rules for installation:

  1. Installation of a parapet boiler is allowed only in rooms with a length of 4 meters or more and a height of at least 250 cm.
  2. The height of the doorway in the room with the appliance should be greater than 80 cm.
  3. The room must be frequently ventilated, so it should have at least one window.
  4. To maintain the burning process, a constant supply of air is necessary. Because of this, the room with the boiler should be well ventilated.
  5. Gas supply can only be carried out with metal pipes. Any other option is unacceptable.
  6. The diameter of the chimney pipe (from 13 to 17 cm) is chosen depending on the power of the device.
  7. The part of the chimney that is outside the building must have a height of at least half a meter.
  8. To prevent natural gas leaks, an additional fuel stop valve must be installed.
  9. A special device (analyzer) must be installed in the room with the gas boiler. It will notify the owners of the apartment or house about gas leakage and will help to avoid various negative consequences.
  10. It is recommended to equip the device with a fuel consumption meter.
  11. The system of electricity supply must have thermal insulation and protection from electric current.

The parapet gas boiler is a practical heating appliance that lets you keep the room at a comfortable temperature. You can prolong the appliance’s life and prevent emergencies by installing it correctly and following all instructions.

Gas boilerswith single or double circuits as well as indirect heating boilers

Possible problems with gas equipment of this type

The chimney is covered in ice.

Owners of gas boilers for parapet heating may experience a number of issues. Initially, their sealed chamber is made up of two structural components joined by a porous, heat-resistant polymer-based substance. In the event that boiler maintenance is neglected, the thermoplastic may lose its tightness without your knowledge. Poisoning can occur from carbon monoxide and other toxic exhaust gas constituents entering the living area. For this reason, parapet boiler maintenance needs to be done on schedule.

Second, ordinary grade steel is used for the coaxial chimney in low-cost models. Simultaneously, the regulations governing the operation of gas equipment mandate that chimneys be made exclusively of stainless steel. If not, condensate and soot building up on the chimney walls may create a chemically active environment.

The steel walls are eaten away by it. The air current that feeds the gas burner is contaminated with carbon monoxide from the inner pipe. Consequently, the gas chamber does not contain enough oxygen to allow the energy carrier to fully burn. The apparatus performs less well. Soot builds up on the boiler walls, hastening the process of corrosion.

Thirdly, there is always a chance that powerful wind gusts will extinguish the burner’s flame when using a coaxial chimney. For this reason, wind protection must be installed when installing the device.

Features of parapet boiler Lemax Patriot 16

The price of this equipment model is 21,000 rubles for consumers. Systems for forced or natural heating can be used in conjunction with boilers. It is not necessary to be connected to the electrical grid. The superior 2-mm steel used to construct the rectangular heat exchanger satisfies European standards.

Because the heat exchanger is coated in an anticorrosive enamel and has been treated with an inhibiting composition, it is consistently shielded from the damaging effects of aggressive substances like salt solutions and mineral oils. The boiler is only compatible with heating systems that have the gas burner device’s original parts installed. It is possible to connect the heating from both sides.

The boiler can hold 16 kW. 160 m2 is the heated area. There are holes in the front panel that allow convection to occur. Because the boiler has a unique protection mechanism installed by the manufacturer, you don’t need to worry about it overheating. Because the boiler’s design includes detachable cladding elements and profile tooling, maintenance is fairly straightforward. Through the viewing window, you can observe the ignition and main burners burning.

Choice of heating system

You must comprehend the apparatus and the working principle of the method in order to decide which gas boiler is better for a chimney or a parapet. The size of the room, the effectiveness of the ventilation, and power outages must all be considered when selecting the equipment.

The heating system’s water is heated by a dependable, affordable, and effective method called a gas boiler with chimney. Exhaust gases from the device with an open combustion chamber are removed using a chimney. The exhaust gas can be released into the street via a pipe thanks to the temperature differential. A short, wide discharge pipe is installed on boilers with a closed combustion chamber. Equipment suitable for private homes with adequate ventilation that has a chimney.

Because they have a closed combustion chamber and don’t need a pipe to be installed to drain exhaust gases, parapet boilers are more adaptable. This method can be implemented in urban apartments with inadequate ventilation systems as well as homes. The device has just two installed pipes that supply clean air and exit exhaust gas. One boiler can be used to heat the entire apartment if you select a model with the right features.

Note: A wall-mounted device can be substituted with a parapet gas boiler. Additionally, the wall-mounted unit needs to be secured to the wall using specific brackets.

The best boiler manufacturers

There are numerous well-known manufacturers of heating systems on the market, including those from Europe, Russia, Korea, China, and so forth. There are effective and successful models in every brand’s assortment, but these units are typically in the pricey range. Naturally, European heating systems are of a much higher caliber than Chinese heating systems, but the cost is also higher.

Characteristics of devices made by various manufacturers:

  • Korean firm Navien produces inexpensive devices and a large number of spare parts for them. Of course, the quality of the cheapest devices of the company is low, but you can find some good models in the expensive segment.
  • Baxi is a well-known Italian manufacturer. The company"s boilers are characterized by functionality and reliability, despite the fact that most of the units are assembled in China.
  • The domestic brand Lemax produces a lot of good parapet boilers, characterized by a low price and acceptable quality. The assembly of the appliances falls slightly short of European standards, but the cost compensates for this shortcoming.
  • The well-known brand Ariston also produces good heating systems. The company"s technology stands out for its economy and quality.
  • German brand Vaillant – a renowned manufacturer of premium class heating equipment. If funds allow, it is worth giving preference to parapet boilers of this company.
  • Some devices of the Slovenian company Protherm can be compared in quality and reliability with Baxi units. The cost of gas boilers of the company is noticeably lower than that of the Italian brand.
  • The company Artem – a well-known Ukrainian brand, producing inexpensive and reliable boilers.

While many Russian and Ukrainian businesses develop and produce heating systems, only a select few produce high-quality equipment.

How to install a parapet heating boiler

Requirements for the room for the parapet boiler

  • Parapet boilers up to 30 kW, can be installed in a room with a total area of up to 7.5-8 m². Kitchen and utility rooms may be used for needs.
  • Minimum ceiling height of at least 2.2 m.
  • Ventilation of the room – the boiler room must have working supply and exhaust ventilation. Doors should be installed without thresholds. It is obligatory to have windows that can be opened.
  • Lighting – for every 1 m³ of boiler room, there should be at least 0.03 m² of window opening.
  • Peculiarities of operation – maintenance of gas equipment is carried out at least once a year. Along with the operability of the boiler, check the work of the supply and exhaust ventilation. On the made inspection, an act is drawn up.
  • Commissioning of the boiler is possible only after inspection by a representative of the supervisory authorities, compliance with all requirements regarding the correct connection of gas equipment.

Chimney for parapet boiler

  1. Horizontal section, the total should not exceed 3 m.
  2. When passing the floor slabs, a special block is used – partitioning.
  3. On the head of the chimney, install a condensate trap and wind protection.
  4. The chimney is installed at a slight incline from the boiler to prevent condensate from flowing inside the device.

How to protect the parapet boiler from wind

  • No wind protection on the chimney cap. The factory-fabricated cover already has a special insert to protect against wind gusts. Protection can be made of any galvanized steel, attaching it to the casing with press washers or rivets.
  • Incorrect settings are set – to avoid blowing out the parapet boiler, it will be necessary to lower the permissible gas pressure, at which the module will remain operational.
  • Insufficient thrust intensity – the gas duct device is made in such a way that the slightest disturbance in the thrust characteristics, will lead to a boiler shutdown. To eliminate problems, check the correctness of the chimney connection and correct any mistakes made.

It is preferable to leave the unit’s installation to a licensed professional with the necessary qualifications in order to avoid potential boiler shutdowns caused by strong winds.

Weaknesses and strengths of parapet type boilers

  • Minuses – parapet models have a small capacity and are not designed for heating large areas of premises. Boilers are suitable exclusively for heating small private houses and apartments. The equipment is sensitive to mistakes made during the installation of the coaxial chimney.
  • Pluses – compact size and the ability to choose the boiler, with the necessary side of the connection to the heating system. Models are distinguished by low cost, energy efficiency and efficiency, in the range of 98-100%. Closed furnace chamber and lack of negative impact on the microclimate of the heated room, reduce the requirements for their installation.

The main types of parapet boilers

Devices that can be conditionally divided by: can be used in both an apartment and a country home.

  1. place of installation;
  2. availability of automatics;
  3. capacity;
  4. autonomy from electricity;
  5. the method of withdrawal of gas combustion products;
  6. type of heat carrier;
  7. functionality;
  8. type of burner;
  9. price, etc.

Depending on where they are installed, devices can be:

  1. wall-mounted;
  2. floor-mounted.

Due to the fact that their power is frequently limited to 30 kilowatts, the first are more widely used. No, there are wall-mounted appliances with greater power, but these are more akin to miniature boilers that integrate multiple appliances using the cascade principle.

Larger buildings up to several square kilometers can be heated with floor equipment, which is frequently more powerful.

According to the type of chimney

In this context, the parapet gas boiler is associated with:

  1. forced draught;
  2. natural.

The coaxial chimneys mentioned above are found in variant No. 1, and the traditional chimneys found in variant No. 2 are formed like pipes and pass through the roof.

Take note! Turbo boilers are mentioned frequently. These wall-mounted parapet models are essentially the same, but they use special fans to discharge the fuel combustion products through a coaxial chimney.

Click this link to learn more about installing and maintaining a coaxial chimney.

In the event that there is a natural draft, the air supply comes directly from the room because the boiler’s burner is open. Additionally, the chimney is fed from the outside if it is coaxial. Additionally, because the air in the room is coming from outside rather than being burned, these boilers are typically used in conjunction with parapet devices, which greatly improve the environmental conditions within the space.

Take note! These chimneys have the ability to be both horizontal and vertical, which greatly expands the options available when deciding where to install a heat generator.

Video – Coaxial Chimney


Parapet type units can have one or two circuits, as we have already discussed. In the first scenario, only the house is heated; in the second, it is feasible to give each resident access to additional hot water. They have flow heaters installed, primarily made of copper because it has the highest thermal conductivity of any metal. Boilers can also be linked to the system from the left, right, or both sides simultaneously, which greatly simplifies the distribution of heat.

Take note! Even though the devices were made to work with natural gas initially, you can replace the burner if needed, and they will still function flawlessly with liquefied gas.

See also our analysis of gas boilers with two circuits.

About the heat carrier

Not many people are aware that using water from the main heating system for household uses is forbidden. However, if the hot or cold water is turned off, this is frequently the last resort. Many just open the radiator tap and remove the necessary amount of liquid, like when they clean the floor.

However, since this water contains additives that stop various types of deposits from forming on the walls of the heating apparatus, we do not recommend doing so. Additionally, using it might be harmful to your health.

Because not all appliances can operate with such a coolant, thoroughly research this detail before installing a parapet gas boiler in the apartment. However, you can use any device in a home where the owners themselves control the carrier’s purity without even considering the water’s quality.

To sum up

Similar to other heating appliances, the efficiency, economy, and capacity of the heat exchanger should be taken into consideration when selecting a parapet gas boiler, in addition to its performance. Additionally, you must consider the water usage of each household member if you intend to purchase a two-circuit device.

If the gas unit’s power is insufficient, it is preferable to install a boiler alongside a less expensive model for a single circuit.

Design of parapet equipment

The unit’s body is coated in a powder-based fireproof anti-corrosion paint that protects metal from rusting and the effects of high humidity, ideal for kitchen conditions. The working unit’s thick 3-millimeter body—not the casing—is resistant to mechanical forces.

The apparatus is straightforward but efficient:

  1. Thick-walled metal casing;
  2. Closed combustion chamber;
  3. Gas burner and ignition;
  4. Coaxial chimney;
  5. Metal jacket (heat exchanger), if there is a second circuit – copper or brass coil.

Boiler apparatus

Automated surveillance and command system:

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

Self-installation of parapet equipment is impossible – it must be done by gas service representatives after the owner has obtained the appropriate permits. The unit can be mounted anywhere. The main thing is that the boiler should stand next to the wall – this way the coaxial chimney will be short and safer. The main advantage of parapet boilers on gas – a closed combustion chamber and coaxial chimney, which can be installed anywhere in the room. These two nodes and allow the boiler in any place in the room, without fear for the safety and health of the occupants, as neither hermetic closed combustion chamber, nor autonomous chimney does not allow toxic gases to enter the atmosphere of residential premises.

A coaxial chimney is made of two metal pipes with varying diameters. Air is drawn into the combustion chamber by the smaller-diameter pipe being inserted into the larger-diameter pipe and the space between them. A smaller diameter pipe is used to release the combustion products outside.

The parapet boiler’s coaxial chimney arrangement

It is strictly forbidden to install a parapet gas boiler on your own, independently. Only workers for the regional gas service are authorized to connect the parapet gas boiler to the gas mains. Licensed professionals should install and commission gas equipment.

Installing gas parapet equipment is comparable to installing a gas convector: the coaxial chimney’s smoke extraction system is routed through the building’s wall and out onto the street. The pipe’s end needs to be covered with a windproof cap to prevent strong winds from extinguishing the wick. The water spigots for the DHW circuit, gas, and heating are then installed in the same manner.


Parapet boiler’s heat exchanger

A unique technology for removing the effects of combustion and air inflow is used in the parapet design. Air can enter directly from the street because of the coaxial chimney built into the wall. Additionally, the smoke is safely extinguished without entering the space.

A closed furnace chamber lets the fuel burn completely while shielding users from carbon monoxide.

There is a convection opening in certain modifications. which allows for the efficient heating of the small space. Radiators and plumbing don’t need to be installed either.

The model with two circuits is enclosed. Additionally, water that is moving through it heats up. Additionally, it has technical applications.

The following elements are crucial to the design of such an appliance:

  1. Heat exchanger. It converts the energy from combustion of fuel into heating of the heat carrier. For better operation the body of this component is made of stainless steel. Thickness – 3mm. The welds are homogeneous and of high quality.

The heat exchanger has a rectangular shape. Seams on the outside are reachable. This makes it easy for you to fix this boiler component if needed. Used solid drawn pipes are also present here.

  1. Turbulizers. They are arranged in pipes. Their task is to increase the efficiency of the boiler. They also protect the device from the accumulation of soot on its walls.
  2. Stainless steel coaxial baffle and reliable seals. With their help, the deflector is connected to the heat exchanger and perfect sealing is achieved.
  3. Window arranged in the body of the appliance. It allows monitoring the activity of the burners (main and ignition).
  4. Copper circuit for hot water. This metal provide excellent thermal conductivity.
  5. Capillary thermometer. It is embedded in the glass of the thermal cylinder. It controls the heating of the water.
  6. Automatic devices. Ensure safe operation of the unit and regulate gas pressure in the main line.
  7. Micro flame burners. They are usually introduced in wall-mounted parapet models. Thanks to them, the fire is evenly distributed throughout the entire firebox.
  8. Special modernized ignition kit for the ignition of the ignition burner. It has a piezo-component and a thermocouple. They ensure safe operation from the moment the boiler is switched on and prevent the threat of explosion.

The most famous manufacturers of gas boilers in Russia

Natural gas is the most widely used and least expensive fuel for home heating. Gas equipment and Russian gas boilers, which burn gas to extract thermal energy, are therefore highly sought after. The Russian boiler costs a lot less than a Korean or European appliance.

Several well-known companies in the Russian Federation manufacture high-tech gas boilers:

  1. Rostovgazoapparat, Russia"s largest company. This company was the first in Russia to start industrial production of gas heating devices for private homes. Popular Rostov heating boilers – a benchmark of reliability, quality and durability. The company is a flagship in the production of gas appliances.
  2. Zhukovsky Machine-Building Plant produces modern aviation equipment. Since 1967 the plant started production of the famous AGV 120 boilers. Currently produced about 30 models and various modifications of heating devices. AKGV, AOGV, KOV boilers are produced with capacities in the range of 11 – 68 kW. They are energy-independent and equipped with DHW. Production of Zhukovsky Machine-Building Plant – Zhukovsky gas heating boilers successfully compete with the products of European and Asian companies.
  3. Not far from Lipetsk is located JSC "Borinskoye", which was founded more than 80 years ago, and in 1992 the first gas boiler under the brand AOGV-11,6 was produced. Currently, there are more than 30 models of gas boilers are produced. Modern gas heating boilers Lipetsk enjoy well-deserved popularity.
  4. Biysk Boiler Plant is a leader in the manufacture of hot-water and steam boilers with medium and small capacity, as well as various boiler and auxiliary equipment for municipal and industrial heating.
  5. Lemax" company is located in Taganrog. It produces gas single-circuit and two-circuit boilers Lemax, as well as water-heating gas columns. Depending on the model, heating boilers gas Taganrog are equipped with a cast iron or steel heat exchanger. The company"s line of boiler models includes three series – leader, premium and premium Nova.
  6. AO Gazapparat in St. Petersburg, which is a part of Gazprom. Gas boilers are known under the brand name NEVALUX. All gas appliances, which are produced under this brand, are completed with high-quality automatics of leading European manufacturers.

Gas boiler Kerber, which has a steel heat exchanger

These boilers, which use a steel heat exchanger, can be installed in both private homes and apartments without the need for chimneys. The parapet boiler’s dimensions enable installation anywhere that is practical, such as beneath a window sill. It is possible to connect the heating system on the left or right, or on both sides simultaneously. Furthermore, this kind of boiler can run on liquefied gas in addition to regular gas. (See: Site Map, too.)

Let’s ascertain the parapet boiler’s technical design:

– A coaxial baffle sealed with silicone to ensure a tight connection to the heat exchanger;

– Turbulizers are installed in the pipes that allow the combustion products to be discharged; their unique design increases the efficiency of heat transfer from combustion products to heat carriers and helps to ensure a high level of efficiency;

– A window that allows for visual control over how the pilot and main burners burn;

– The hot water supply circuit consists of coil-water heaters constructed from 12 millimeter-diameter copper tubes. The purpose of it is to heat process water. Because copper is a great heat conductor, the water heats up considerably faster, saving both time and energy. (See. additionally: )

Model overview

Even without the "assistance" of extra equipment, the boiler can efficiently heat the house if the manufacturer and model are chosen with care.

Gas boilers, also known as "danko," can heat spaces up to 140 square meters because their capacities range from 7 to 15 kW. This manufacturer’s appliances are equipped with piezo igniters, micro flame burners, and automatic gas supply systems. The heat exchanger’s walls are three millimeters thick.

This exchanger has been updated in a characteristic way, and in theory, the right-left connection is disregarded. This makes the installation process easier. Since this connection is bilateral, a significant amount of workspace is saved. Additionally, there is a unique panel that lets you control how the device operates and keep an eye on it.

Get the PDF version of Passport Parapet Boiler Danko.

Video parapet boiler – Model "Danko 7U"

One of the biggest producers of gas equipment in Russia is "ROSS." Ordinary users refer to its boilers as AOGV, and they can produce up to 100 kW of heat.

Parapet boiler aton compact

Not less well-known are the boilers from the "Aton" series, in which a significant amount of money has been invested recently. Boilers are made using state-of-the-art machinery, resulting in a product that is both highly quality and aesthetically pleasing.

Video – Model "Aton Compact 7E (mini)"

Gas parapet boiler Zhitomir

Additionally, there are gas boilers called "Zhitomir" that are ideal for heating homes with multiple stories. They have a completely hermetic combustion chamber with automatic process control, a temperature control device, piezo ignition, and an integrated reducer. There are spigots on both sides of each boiler for connecting to the heating system.

All products are tested seven times to ensure flawless operation in an emergency, and the manufacturer guarantees that every product is completely safe to use. When it comes to efficiency, it can get as high as 90%.

Video – Advantages of models "Zhitomir"

Take note! Parapet boilers can be purchased for 11250–25000 rubles, though there are models that are more costly. Everything is dependent upon the manufacturer and technical specifications.


Parapet boilers are incredibly compact.

  1. The presence of a closed fire chamber. This makes the apparatus universal. It can be installed in an apartment, because there is no need to conduct a chimney and a pipe on the roof. In the apartment such a boiler is better to put at the outer wall in the kitchen. And if this room has a free area under the window sill, the boiler can be placed there.
  2. Extensive range. The power limits of the modifications presented in sales are as follows: 15 – 40 kW. This allows you to choose a version for rooms of different areas.
  3. Possibility of application for hot water supply. Here a two-circuit model will be required.
  4. Boiler installation has no effect on electricity bills.
  5. Compact size.
  6. The body is characterized by a modern design. For this reason, boilers fit well into many interiors.
  7. Acceptable prices.
  8. The possibility of independent installation.
  9. Can be adjusted to function on propane-butane composition. Such a need usually arises when it is not possible to connect to the main gas network.

These boilers have the following drawbacks:

  1. They are susceptible to weather influences. For example, a strong wind, they can be blown away. Therefore, a screen is often placed in front of the chimney to protect it from the wind.
  2. Modest power. It is extremely difficult to qualitatively heat rooms of a large area with them. This technique is more suitable for heating tasks in small houses and apartments.
  3. Sensitivity to defects that can occur when installing a coaxial chimney.

Gas boilers with parapets provide a contemporary way to heat houses effectively and efficiently. These small units provide a stylish, inconspicuous heating solution for any home because they mount straight onto the wall, conserving valuable floor space.

The great energy efficiency of parapet gas boilers is one of their main benefits. These boilers can effectively provide heat for your house using natural gas as a fuel source, which lowers energy costs and has a smaller environmental effect.

The adaptability of parapet gas boilers is an additional advantage. They are appropriate for a variety of homes and heating needs since they are simple to incorporate into both new and old heating systems. In case you’re renovating your house or constructing a new one, a parapet gas boiler can provide dependable warmth and performance.

Furthermore, modern features like digital controls and programmable thermostats are frequently included with parapet gas boilers, enabling homeowners to effortlessly monitor and modify their heating settings for the best possible balance between comfort and efficiency.

All things considered, parapet gas boilers are a practical, economical, and adaptable choice for home heating. These boilers help save energy costs and lessen their environmental effect while delivering dependable warmth and comfort thanks to their small size, high efficiency, and sophisticated features.

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