Gas boiler without chimney

Working principle and advantages

A boiler with a chimney that is completely absent or has, but is very simple, has a number of its own unique design features, a certain principle of operation, which we will discuss later.

Since gas is used to operate such a heating unit, the main requirement is the presence of a cylinder connected to the device or the presence of an already laid gas line. Also, although the name implies that such a boiler is chimneyless, it still has a chimney, but in comparison with other large, complex and massive systems, it is very simple.

In order to make such a hearth even more useful and powerful, to heat a large house with it, you can connect it to heating radiators and thereby convert it into systems with a water circuit. Heating in this case will be carried out due to the circulation and heating of cold water in the batteries of each room. In the same way, you can get hot water in the house.

A double-circuit gas chimneyless boiler consists of the following elements:

• Lines or gas supply systems;
• A heat exchanger through which heated water moves and circulates;
• Return heating circuit;
• The input element, through it, cold water enters the system;
• An output element that is used to bring out and use already hot water for various domestic needs and purposes.

Such systems are complemented by two circuits at once, each of which is not connected to each other. This allows you to use them individually and for different needs. Such a variation can be supplemented with a coolant, in contrast to single-circuit ones, which can be used at most for simultaneous heating and hot water production using a device such as a boiler, which is purchased separately.

The most economical and budgetary variations are those that have a boiler with indirect heating, due to which a closed local recirculation is formed. Thus, you can equip your house not just with hot water, but also get it heated to a certain temperature by simply opening the tap. The disadvantages include the bulkiness of such systems, due to which they do not fit into small houses and apartments. At the same time, the price of products produced by well-known and trusted brands is not always the lowest and most affordable.

Before you buy a chimneyless boiler, we recommend that you familiarize yourself in more detail and in detail with all its positive qualities and operational capabilities:

1. Double-circuit variations of the modern sample are distinguished by their average, and in some cases quite miniature overall dimensions. Due to this, such a unit can easily fit even in the smallest and most standard kitchen or in a special allotted utility room;
2. The functionality of such foci is very large and diverse. This is not just a heating device, but also the ability to connect to a water jacket to heat a large area. If you have a boiler, you can get water for domestic purposes;
3. Differ in economy. The owner of the house can use such boiler equipment as necessary, thereby reducing the consumption of resources;
4. Since double-circuit variations have a simple list of components, unlike single-circuit boiler plants, installation can be done by hand and without the help of a wizard.

The disadvantages of this variation include the fact that it is not capable of performing several actions at the same time. For example, when performing the heating function, you will not be able to receive hot water. Also, the heating of water does not occur immediately, but gradually. At the same time, the smaller the size of the tank for filling and storing water, the less you can provide your house or apartment with hot water.

When using such a boiler, it is important to remember that, for example, when using water in the kitchen, it may not be enough for someone who is currently washing in the bathroom.

Manufacturers and brands

Equipment of this class is produced by all well-known European companies, as well as domestic enterprises. If we consider its cost in relation to wall and floor options, then it is distributed in the same way as for boilers with an open combustion chamber. Wall-mounted options are cheaper, while floor-mounted options are the highest priced.

If we make a comparison between local and foreign models, then there is no particular difference between boilers with an open and closed combustion chamber. Imported samples also have the highest prices, and products from a domestic manufacturer are almost 50% cheaper.

If we consider models of boilers from one manufacturer, for example, the very popular Italian company Baxi. Then her gas chimney-free outdoor appliances have a price in the range of 2000, and wall-mounted samples - about 1000 euros. The cost of wall-mounted boilers with an open combustion chamber under the brand of this company is about 700-800 euros.

But, despite the higher price, chimneyless boilers are in great demand, especially when equipping apartment heating systems in multi-storey buildings.

Chimneys and material options for their device

The current gas-fired heating equipment has a fairly high efficiency and low temperatures of combustion products, which implies increased requirements for the materials from which the chimneys are equipped. The construction market is gradually replacing bricks, steel, asbestos pipes, galvanizing with more relevant ones. Increasingly, they use special protective sleeves, as well as stainless steel, Hungarian furanflex. Let us consider in more detail the parameters of each of these materials.

Galvanized pipes

Steel pipes quickly corrode, which makes the operation of a galvanized chimney rather short (about 3 years). The use of a specially designed protective coating can extend the service life up to 5 years.

Asbestos-cement pipes

This material was widely used in organizing the removal of combustion products, despite the maximum temperature of 300 degrees Celsius. This option has an acceptable cost, but it has a number of nuances that one would have to face (for example, installing a chimney on a gas boiler is quite difficult in a vertical plane, insufficient tightness of the joints, the likelihood of rupture or split pipes when they overheat, as well as the ability of asbestos cement to absorb moisture and condensate).

brick chimney

Brick is far from the best material for creating a chimney, since condensate contributes to the rapid violation of the integrity of this material. Quite often, in houses equipped with a brick chimney, the ceilings and walls are “decorated” with damp spots, which are formed due to the absorption of moisture and condensate by the brick.

Protective sleeve

The smoke extraction device, which has equal perimeters of the ventilation duct and the protective sleeve, is a composite multilayer shell. The main function of this design is to protect the flue channels from the adverse effects of thermal gas flows. Special sleeves can seal ventilation channels, their use can minimize the effect of combustion products on the chimney, as well as improve draft and increase the operating time of the entire structure.

Furanflex

It is a new option that is used for the chimney device. It is made of reinforced plastic reinforced with special fibers. A distinctive feature of this material is resistance to interaction with the acidic environment of condensate, low thermal conductivity and efficiency when operating at temperatures below 200 degrees Celsius.

Stainless steel

This material is distinguished by high rates of tightness and fire safety, by quickly overcoming the threshold of condensate formation. Due to its round cross-section and smooth surface, stainless steel contributes to the formation of maximum traction

When buying pipes of this type, you should pay attention to their marking data, since they can significantly affect the quality of welded joints, as well as options for connecting disparate elements into a single structure

Parapet heating systems

One of the types of gas chimney boilers is parapet. The design resembles the device of condensing equipment. The main difference from the latter is the presence of a closed combustion chamber. During operation, the air that is inevitably consumed during combustion enters the furnace not from the room itself, but from the street, therefore, overheating does not occur and the oxygen concentration does not decrease. As a result of this method of operation, the indicators of economy, environmental friendliness and equipment efficiency increase.

It is important to remember that some types of equipment, in addition to the traditional heat exchanger, have a convection casing in their design, which allows you to heat the room using less gas, that is, with greater efficiency. There are mounted types of parapet equipment, which for the most part are volatile, and also require additional power from electrical networks.

At the same time, floor standing units are completely non-volatile.

Features of installing a coaxial chimney

The coaxial chimney does not exit through the roof; you can safely turn the chimney and lead it through the wall.

Important! There should be no windows on the wall where the coaxial chimney pipe exits. After all, the combustion products remain dangerous to humans and, by placing such a chimney under the window, carries the threat of poisoning through the window

In conclusion, I note that gas boilers without a chimney, or rather with a coaxial chimney, can be both floor-mounted and wall-mounted. Brands: Daewoo, Olympia, Rinnai.

Gas boiler Lemax Patriot-12.5

Gas boiler Viessmann Vitopend 100-W A1HB001

Gas boiler Lemax Patriot-20

Gas boiler Lemax Patriot-10

Wall-mounted gas double-circuit boiler Kentatsu Nobby Sm.

Gas boiler Royal Thermo Aquarius 24 MC

Gas boiler Vaillant turboFIT VUW 242/5-2

Gas boiler Lemax Patriot-16

Gas boiler Royal Thermo Aquarius 24 BC

Gas boiler Lemax Premium-16

Gas boiler De Dietrich Zena Plus MSL 24 MI

Wall mounted gas double-circuit boilers Chaffoteaux ALIXIA.

Wall-mounted gas double-circuit boiler Rinnai BR-K24

Gas boiler Royal Thermo Aquarius 18 BC

Gas boiler Lemax Patriot-7.5

Wall-mounted gas double-circuit boiler Rinnai BR-RE24 (2.

Wall-mounted gas double-circuit boiler Rinnai BR-R 24(23.

Wall mounted gas double-circuit boilers Chaffoteaux ALIXIA.

Gas boiler De Dietrich INNOVENS PRO MCA 45

Gas boiler Lemax Gazovik AOGV-11.6

Gas boiler De Dietrich ZENA MS 24 BIC

Wall-mounted gas double-circuit boiler Rinnai BR-RE42 (4.

Wall-mounted gas double-circuit boiler Kentatsu Nobby Ba.

Gas boiler Viessmann Vitopend 100-W A1JB010

Gas boiler De Dietrich ZENA Plus MSL 24 FF

Gas boiler Viessmann Vitopend 100-W A1HB002

Gas boiler Buderus Logamax U072-12K

Chimney coaxial Protherm

Gas boiler De Dietrich ZENA Plus MSL 31 FF

Gas boiler Bosch Gaz 6000 W WBN 6000-18 C

Gas boiler De Dietrich ZENA Plus MSL 24 MI FF

Chimney gas boiler THERMEX XANTUS

Gas boiler Lemax Patriot 12.5 (without chimney)

Gas boiler Lemax Gazovik AOGV-6

Gas boiler De Dietrich ZENA Plus MSL 28 MI FF

Wall-mounted gas boiler Lemax Patriot 12.5 without USD

Wall mounted gas boiler BaltGaz 17

Gas boiler Lemax Premium-12.5

Wolf concentric horizontal chimney kit.

Gas boiler Lemax Patriot 16 (without chimney)

Gas boiler De Dietrich ZENA Plus MSL 31 MI FF

Gas boiler Atem Zhytomyr-M ADGV 7CH

Gas wall-mounted boiler Lemax Patriot 12.5 (with chimney.

Gas boiler Protherm Jaguar 24 JTV

Gas boiler Viessmann Vitopend 100-W A1HB003

Gas boiler Kiturami Twin Alpha 13

Gas double-circuit wall-mounted boiler Buderus Logamax U.

Gas boiler Viessmann Vitopend 100-W A1JB011

Gas boiler Lemax PRIME-V24

Gas boiler Atem Zhytomyr-M ADGV 10 CH

Gas boiler Lemax Patriot 6 (without chimney)

Chimney kit bcsa0431 Navien for Asian type.

Gas boiler Atem Zhitomir-3 KS-G-020 SN

Gas boiler Twin Alpha 16R (Korean chimney)

Gas boiler Atem Zhytomyr-M AOGV 15 CH

Gas boiler Lemax Premium-10

Gas boiler Viessmann Vitopend 100-W A1JB012

Gas boiler Signal-Heat engineering S-TERM 16 (KOV-16 SKs.

Gas boiler Lemax Patriot 20 (without chimney)

How to make an exhaust pipe for a chimneyless boiler

The advantages and disadvantages of chimney-type boilers have been discussed more than once in various construction forums. In Europe, the units enjoy a well-deserved reputation for cost-effective and reliable equipment with low installation requirements. Under domestic operating conditions, boilers have a slightly reduced efficiency and productivity.

Several aspects can be identified as advantages:

• There is no need to coordinate with the gas service when installing a turbo boiler, subject to the purchase of licensed and certified equipment.
• It is allowed to install the boiler in rooms with a limited area, in multi-apartment and private houses. There is no need for forced ventilation of the room.
• Productivity - chimneyless units use the temperature of heated flue gases to obtain additional thermal energy, which increases the efficiency and efficiency of devices.

What malfunctions often occur with chimneyless boilers?

Most malfunctions occur due to improper operation or installation of equipment. The specialist will try to find out the reasons why the chimneyless boiler goes out and eliminate them. There are several factors leading to this:

• Poor draft - non-compliance with the requirements regarding the installation of a coaxial pipe: exceeding the allowable vertical and horizontal sections, leads to the shutdown of the equipment.
• Voltage failures - in most cases, sensitive automation is installed in chimneyless units. When the voltage fails, the processor gives a signal to turn off.
• Violations in the operation of automation - the design provides for a large number of monitoring sensors: thrust, heating of hot water and coolant, etc. Failure of any sensor leads to a stop of work.

If you follow the rules for installing chimneyless wall-mounted heating boilers and carry out regular maintenance, the devices work without complaints and difficulties throughout the entire period of operation.

How to deal with the blowing of a chimneyless turbo boiler?

One of the main problems that owners of chimneyless heating equipment face is shutting down work due to poor draft or blowing out of the boiler. The danger of a reverse chimney draft for a boiler with a closed combustion chamber lies in the likelihood of carbon dioxide entering the room, as well as the failure of individual components.

You can troubleshoot in several ways:

• Improve draft in the boiler by installing a deflector that increases draft by approximately 1.5 times.
• Install wind protection - a block mounted on the pipe head reliably protects against wind ingress.
• If the situation is not corrected, the coaxial chimney is redone, taking into account the technical requirements for the location of the chimney, when installing a turbocharged boiler with a closed combustion chamber in a private house.

In Europe, it is mandatory to install a gas detector when operating any gas equipment. In our country, this is a desirable measure that has already saved more than a dozen lives.

Which boiler is better - chimney or chimneyless, expert opinion

When answering this question, it should be taken into account that condensing / chimneyless boilers were created for operating conditions in the low-temperature mode of heating the coolant. The efficiency declared by the manufacturer of 95% is possible only if the return temperature is not more than 40 ° C. In the conditions of the harsh Russian winter, it is quite difficult to fulfill this condition.

Installation of a boiler with a closed combustion chamber in a conventional chimney, when replacing old equipment with a new one, is prohibited. You will have to redo the smoke exhaust system, which is quite expensive.Chimney-free units are best suited for well-insulated buildings located in temperate climates.

Features of the design, operation and installation of outdoor chimneyless gas boilers

If it is impossible to install a classic vertical chimney, chimneyless gas boilers are used for heating. For such heating equipment, a ventilated separate room for natural draft is not equipped.

Despite the name "chimneyless", there is a chimney in such boilers. Its role is played by a compact coaxial pipe, which provides traction and removal of smoke masses from the combustion chamber.

External outlet of the coaxial chimney

The design and principle of operation of chimney-free boiler equipment.

Chimneyless, like classic gas boilers, operate in heating mode - single-circuit, and even like water heaters (DHW) - double-circuit.

A distinctive design feature is the closed combustion chamber. The burner, through which the gas heats the water in the system, is located in a sealed chamber. Thus, carbon monoxide, soot and smoke from the combustion of fuel do not penetrate into the room, and the efficiency of the boiler increases.

Oxygenated combustion air enters the closed chamber through the external chimney block. The air heated by the burner element heats the copper circuit through which the coolant flows. Then the "exhaust" air, together with the products of combustion of the fuel, exits through the internal block of the coaxial pipe.

Scheme of operation of a floor coaxial boiler

Coaxial chimney is simple to implement. These are two coaxial pipes of different diameters, fastened together. Thus, the heated gas waste is cooled by the air entering the chamber, making the boiler fireproof and environmentally friendly for the residents of the house. Cooling the products of combustion, the air enters the combustion chamber already heated, which saves energy.

High-power gas boilers are equipped with deflectors to prevent insufficient draft, which increase the air flow by one and a half times. If there is a possibility of wind blowing, a special wind protection block is installed at the pipe outlet.

Features of the installation of gas boilers with a coaxial chimney.

Floor-standing chimneyless boilers for autonomous heating systems are installed in small buildings and in many apartment buildings or industrial premises.

Chimneyless gas boilers are installed on a special stand. If the boiler is controlled by an electronic board, then it is connected to electricity according to the rules for installing electric and gas equipment by specialists.

They are included in the heating system and gas mains in the same way as chimney gas boilers. The difference is the installation of a coaxial chimney.

Installation diagram of a horizontal coaxial chimney

Requirements for installing a coaxial pipe as a chimney:

1. The outlet of the chimney to the street passes through the wall horizontally. The length of this pipe section is no more than 1 meter.
2. The chimney is horizontal, but if horizontal chimney is not possible, a vertical chimney is used. The length of the vertical part of such a chimney is about 3 meters.
3. The outer part of the pipe is located no lower than 2 meters from the ground.
4. The distance from the pipe to window or door openings is at least half a meter.
5. You can not place the outlet of the pipe under the window.
6. To prevent the accumulation of condensate liquid, it is installed at an angle of 3-5 degrees.
7. Observe the diameters of the pipes of the coaxial chimney and their ratio for fire safety.
8. The hole drilled in the wall for the pipe is lined with a heater made of non-flammable material.

Compliance with these requirements will make the operation of the boiler safe and efficient.

Chimneyless boilers - their pros and cons of operation.

The advantage of underfloor heaters equipped with a coaxial pipe is installation in the living room.To fit the boilers into the interior, the decoration of the walls and the junction of the chimney with the wall is selected.

You can learn more about coaxial chimneys and their use for gas boilers in the video below.

Coaxial boiler in the interior of the apartment

In addition, other advantages:

• simplicity and low cost of installation;
• there is no need to install supply and exhaust ventilation;
• high power units of such a design that they heat large areas;
• some gas models are equipped with convection holes, which makes it possible to heat a room without a radiator;
• long service life.

The disadvantages of coaxial boilers are in the smoke extraction system. The length of the smoke exhaust pipe is not more than 5 meters. During frosts, chimneyless boilers operate at high power, due to which more condensate forms in the coaxial pipe, which freezes and blocks the air supply and smoke removal. The blowing out of the chimney occurs if it is not equipped with a wind protection.

What do we pay attention to

Heating devices with a closed combustion chamber include a coaxial chimney for a gas boiler. It is designed to ensure the smooth operation of the device.

And serious requirements are imposed on it, because combustion products are removed through it, which are very harmful to human health. Therefore, it is recommended to install it through a wall in which there are no window and ventilation openings.

For all other parameters, the criteria for choosing a gas chimneyless boiler do not differ from others

When buying it, you should also pay attention to:

• power
• compactness
• design
• ignition options

The brand of the manufacturer is also an important factor, and since each of them has a wide range of products, it is worth evaluating several different samples to decide which one is best for the room.

Chimneyless boilers are divided into:

Let's start with floor-standing boilers from the Slovak manufacturer Proterm. They are non-volatile and have an efficiency of 90%, are reliably protected from overheating and are supplied assembled. Floor-standing boilers have high power ratings and can be used for heating large rooms, and also have other remarkable characteristics:

• reliability
• ease of operation
• relatively low price
• fuel change option

The next noteworthy models are gas boilers with a coaxial chimney from a Korean manufacturer, today they are leaders in the sales market, not only because they have a low cost, but also due to a fairly large list of high performance indicators.

When choosing these devices, even the brand is not so important. It can be:

All of them are well adapted for use in the Russian climate and have high quality indicators, a large number of safety sensors and are very easy to operate.

German chimneyless boilers are undeniable in their reliability and quality. Not only are they designed for a long service life, they also have a lot of advantages, and environmental friendliness is not the last among them.

The brand plays a significant role when choosing, but other parameters should not be overlooked:

They are also important and must be taken into account when buying.

SNiP norms

The manufacture and installation of any chimney designs must comply with all requests from SNiP 2.04.05-91 and DBN V.2.5-20-2001. This compliance with the norms guarantees the safe operation of the heating system. Violation of the conditions listed in the documents can lead to problem situations, the solution of which will require the participation of the gas industry.

Abstracts from the main regulatory documents:

1. The structure of the condensate collector should solve the problem of moisture accumulation on the walls of the chimney;
2. Good traction is required;
3. The head of the chimney must be free and does not allow the presence of deflectors or fungi on it that inhibit the removal of combustion products;
4. Be sure to carefully fit all structural elements at their joints;
5. Tight sealing is required at joints and all kinds of connections.

Chimney boilers general information

When choosing chimney boilers powered by natural gas, you need to know what types of this equipment are on sale today. Popular types are:

• Parapet boilers;
• Mounted;
• Floor.

When choosing equipment for heating, you should pay special attention to the following indicators and parameters:

• Possibility of additional power supply from electricity in case of emergency shutdown;
• The presence or absence of a circuit and / or built-in boiler;
• Performance.

Despite the fact that the equipment manufactured in our country does not have a wide range of capabilities and the functionality is much more modest than that of analogues from Western countries and Japan, the reliability and durability of all elements make it possible to use it without loss in performance for heating rooms of various sizes.

It is important that all gas boilers are completely safe, as they undergo preliminary quality control before entering the market.