How to choose a gas boiler for heating a private house. Which boiler is better for a private house Types of gas heating boilers

Gas in the Russian Federation is the cheapest type of fuel. Gas boilers themselves are on average a little more expensive than electric and solid fuel boilers, but much cheaper than diesel and combined ones.

Water heating from a gas boiler () is the most economical way to heat country houses. What are the types of gas heating boilers for a private house?

Working parts of the gas boiler:

the combustion chamber;
heat exchanger;
control system;
exhaust system for combustion products.

heat exchanger

A heat exchanger is a container for heating water. Made from cast iron, steel or copper. The configuration depends on the number of circuits in the boiler: one for heating only or two for heating and DHW.

The second type of boilers is more expensive. You can save money: instead of buying an expensive double-circuit one, take a single-circuit one and connect an indirect heating boiler to it.

Types of heat exchangers for gas boilers:

primary - the energy of fuel combustion is transferred directly to the coolant. It is made in the form of a coil with additional plates-ribs. The power depends on the length of the coil and the number of fins. Because this element is prone to scale, regular cleaning and maintenance is required. The installation of water filters is recommended. This type of container is used in boilers with one circuit;
secondary: the heating of the liquid is carried out due to the already heated liquid. The design of a double-circuit boiler.

The types of double-circuit gas boilers, in turn, also differ in the type of heat exchanger:

separate: some plates are responsible for heating water for heating, the second - for hot water supply;
combined (bithermic) consists of two tanks: in a large one, designed to heat water for heating, a smaller one is placed - for hot water supply.

An important point: the use of antifreeze instead of water in the system is possible only for single-circuit boilers. Otherwise, there is a risk of poisoning the whole family.

Control equipment

The gas heating system can be automatically regulated to some extent (). In the most modern boilers, auto-control is carried out by microprocessors: this allows you to set the settings at a time, according to which the boiler will continue to control its own work without human intervention.

The main types of automation of gas boilers are volatile and non-volatile.

The volatile control system operates on 12 volts. It can automatically start and turn off the boiler, regulate the fuel supply and burner power according to the temperature sensor signal, stop the unit in an emergency or in accordance with the settings, display system status data on the display, control the operation of the pump, and independently diagnose equipment.

A non-volatile system does not need electricity, it does not depend on the network. It's cheaper, easier to use. Managed manually. Temperature control is carried out by means of a thermocouple and thermal sensors. Can be equipped with draft and flame sensors.

According to the method of connection with the unit, automation can be wired and wireless. The second saves installers from the need for wiring, wall chasing, etc., but it costs more.

Mounting method and other design features

According to the installation method, boilers are divided into wall and floor. Floor-mounted ones are more powerful, large in size.

For installation, you will need a separate room for the boiler room. Wall hanging can be hung in the living room or in the kitchen. Its power is small, within hundreds of kW.

Types of wall-mounted gas boilers: flow-through (geysers) and boilers. The former are acquired if the need for hot water is not too great; when large volumes are required, a boiler is used (up to 60 liters).

It is always possible to connect a larger boiler to the system. The wall-mounted boiler can be with an open and closed firebox, with one or two circuits.

Types of outdoor gas boilers. Boiler-type tanks are used here. Boilers differ in burner power: single-stage (one power level), two-stage (two levels) and modulating (there is a possibility of smooth power adjustment).

The parapet boiler should be mentioned separately. This is a compact unit of medium power with a closed chamber, which simultaneously heats the coolant and heats the ambient air due to convection.

A grate is built into the body of the parapet boiler through which hot air enters the room. Those. in the boiler room itself, water pipes can not be laid; it is heated by convection.

Parapet boilers are wall and floor, with one and two circuits. Work from natural gas and from liquefied, are completed with nozzles for transition. Three burner options, same as floor models.

Conclusion

We figured out what types of gas boilers are. It remains to choose the power. We proceed from the total figure of 40 watts per cube of heated space.

For regions, there are correction factors:

in a warm region (average monthly temperature in January 0) - 0.7;
temperate climate (the same, -15) - 1.3;
in the north (from -30) - 2.

See completely about the various types of heating of a private house or cottage.

If you want to add a warm floor to the heating from a gas boiler, then we have provided you with information.

Video about choosing a gas boiler for heating.

A gas-fired heating boiler is considered by experts to be the optimal equipment for maintaining the desired temperature in a private house. Properly choosing such a unit is not at all easy, since many of its features and technical characteristics should be taken into account.

Advantages and disadvantages of gas boilers - what you need to know?

Gas-fired heating units are widely used around the world. Such equipment has proven its efficiency and reliability in use. It has the following advantages:

Maximum automation of work. In most cases, it is enough for the user to connect the unit, set the required temperature and forget about the need to control the operation of the boiler until the end of the heating season.
High thermal effect from gas combustion. Gas boilers are really high quality and quickly heat up the living quarters.
Relative cheapness of fuel. From a financial point of view, gas is significantly more profitable than coal, firewood, electricity.
Electrical safety. Many boilers are connected to the mains. But there is a lot of equipment that does not need electrical energy.
Easy and infrequent maintenance. It is enough to inspect gas units once a year (for example, before the start of the heating season). Moreover, this procedure is easy to perform on your own, without involving specialists.
Ready to launch at any moment. You just need to turn on the boiler and it will immediately begin to heat the home.
Ease of use.

A gas boiler for heating also has some disadvantages. First, care must be taken to ensure that there is no leakage of combustible substance. The appearance of such is fraught with serious problems - explosion and fire. Secondly, gas boilers can be connected to the fuel supply network only after obtaining the appropriate permits. You will have to run around the authorities, collect the required signatures, develop a heating project. Thirdly, some types of equipment are prohibited from being installed in residential premises. For their installation and connection, you need to equip a separate boiler room. Despite all the disadvantages described, gas units remain the best solution for organizing heating systems for a private house.

Types of units - you need to figure it out!

The equipment we are interested in is usually divided into several categories. Types of heating boilers are given below:

1. Floor and wall.
2. With closed and open chambers for fuel combustion.
3. With one and two contours.
4. Condensing and convection.
5. Dependent on electricity supply and working without electricity.

Regardless of the type, the units operate on the same principle. They burn gas and heat water (acts as a coolant) to a given temperature.

Floor stands take up a lot of space

Floor gas boilers are unpretentious in operation, have a large margin of reliability. They function without failure for decades, provided that you carry out their maintenance regularly. Such units are installed on the floor, made on the basis of heat exchangers made of alloyed steel or cast iron. Floor equipment is recommended for houses with a large area (from 180-200 square meters), as it is usually characterized by high power. This makes it possible to heat all the premises of a private house with high quality.

Heat exchangers made of steel alloys are prone to rusting. Therefore, special measures should be taken in advance to protect them from corrosion. It is even easier to purchase a unit whose heat exchangers are made of high-alloy or low-carbon alloys. Such steels practically do not rust and are not afraid of mechanical influences.

Wall-mounted ones take up little space, but are usually weaker in power than outdoor ones.

The disadvantage of outdoor equipment is massiveness. The boiler will take up a lot of space in the house. If the area of \u200b\u200bthe dwelling is modest, it is recommended to opt for wall-mounted units. Such heating boilers are more compact and lighter. They are mounted on the wall, occupy a minimum of space and at the same time do an excellent job with their direct task. In terms of power, wall modifications are, as a rule, noticeably weaker than floor installations. But this is not critical if they are mounted in private houses with an area of up to 100-150 square meters. m. If desired, by the way, you can find wall-mounted units with a power of up to 20 kW. Also, wall-mounted boilers have a shorter service life than floor-mounted ones. This is due to some features of their design (in particular, the lack of reliable steel and cast iron heat exchangers).

How many circuits should be in a gas boiler?

If the unit is purchased exclusively for home heating, you can get by with single-circuit equipment. It has an elementary device - one heat exchanger made of copper, steel or cast iron, and a gas burner. Gas boilers with one circuit are floor and wall. Regardless of the type, they are not capable of preparing hot water. Therefore, now such units are used in private homes less and less.

A gas boiler with two circuits is, in fact, two devices at once - the unit itself for maintaining a certain temperature and a flow-through water heater (DHW). The design of such equipment is quite complex. It provides for the presence of special heat exchangers, special three-way valves, a module and an electronic control panel. At the same time, they are even easier to operate and install than single-circuit equipment, which cannot heat water for domestic needs.

Heat exchangers for double-circuit boilers are bithermic and dual. The first ones are made in the form of two metal tubes of different cross-section, pushed into each other. External pipes heat water for heating, internal - for hot water. Dual exchangers are made of two blocks - plate and primary. These modules are installed in the upper and lower parts of the gas unit and are connected to each other. Therefore, they are considered as a single node. The plate heat exchanger is made of special plates (it heats water for household needs). The primary is a tube with fins that provides heating for the home.

Advice. For a private house, as well as for an apartment with individual heating, it is better to choose a two-circuit unit with a dual-type heat exchanger. In it, hot water moves through a closed system. So, the likelihood of scale in the pipes will be minimal. In addition, dual heat exchangers are easier and cheaper to repair. If necessary, only one circuit can be replaced. There is no such possibility in bithermic installations. In the event of a breakdown, you have to spend money on replacing the entire device, which is not economically viable.

It is advisable to buy a water boiler with copper heat exchangers. This material is characterized by unique durability and a very high heat transfer rate. Equipment with copper exchangers is not cheap. But it fully pays off in operation (no breakdowns due to poor water quality, saving on gas consumption). Galvanized steel products are cheap. But the durability of such heat exchangers is minimal. Contours made of stainless steel are operated without breakdowns for a long time. At the same time, units with them have a low efficiency, which is due to the low heat transfer of stainless steel structures.

Double-circuit individual heating, as we see, is more profitable and convenient. It is also important that boilers with two heat exchangers are very compact. They are mounted on the wall, take up little space. The cost of this equipment is high. But when it is installed, there is no need to purchase a separate water heater. And this is a direct saving of money.

What else do you need to know about the types of heating equipment?

Gas boilers for heating can operate according to a convection or condensation scheme. In the first case, the burner of the unit creates thermal energy, which is sent to the heat exchanger. Part of the heat goes into the heating system. Unused calories are released into the atmosphere. Heat loss in this scheme is 7–10%. Condensing plants use almost without exception all the heat (up to 97-99%) generated by the burner. When the boilers operate according to this scheme, condensate is formed. It goes into a special drainage system. If you are faced with a choice of which unit to purchase - condensing or convection, feel free to buy the first of these.

open;
closed.

Boilers with open chambers (they are usually called atmospheric) produce little noise during operation, are characterized by a simple design. They are often made independent of electricity. Air is taken by such devices directly from the room where the equipment is installed, and then flows by gravity to the burners. The combustion products at the same time leave due to natural draft through a standard home chimney.

Installations with closed chambers (turbocharged) take air from the street. To do this, you need to equip a separate two-layer chimney. Through it, the products of gas combustion are also removed. The chimney can be mounted in any room of a private house. This is convenient - there is no binding to a conventional smoke exhaust pipe. But remember that boilers with closed chambers are more expensive, noisy and structurally complex. The latter fact causes their reduced operational reliability. Another disadvantage of turbocharged systems is high electricity consumption. Such boilers, as a rule, are chosen for large private houses in cases where savings are not of decisive importance.

Additional options for heating installations - what to look for?

General requirements for home heating equipment - reliability, efficiency, ease of operation. Modern gas boilers fully meet such requests. At the same time, manufacturers strive to make their units even more comfortable and profitable for consumers. Now many boilers are equipped with additional devices that expand the functionality and safety of home heating installations.

It is advisable to choose units that are initially equipped with all the required piping.

It is understood as specialized safety devices, circulation pumps, expansion tanks and other mechanisms. The piping is mounted on all boilers. Therefore, it will not be possible to save on it. From this point of view, it is most profitable to buy double-circuit heating devices. They all have the necessary piping integrated into the boiler design. If the above devices are mounted separately, you will have to allocate additional space for it in the room. This is not always convenient. But the external strapping has a clear plus. It is easier to maintain and repair in case of breakdown (no need to dismantle the boiler).

Gas heating installations are equipped with a variety of automatic systems. They can function on the basis of mechanical or electronic control. What is the best automation? Undoubtedly electronic. The consumer once sets the parameters of the boiler and no longer approaches it. Mechanical automation requires constant monitoring by the user. True, the cost of equipment with electronic components is quite high. You have to pay for convenience!

Floor-standing single-circuit installations for heating private houses are in most cases controlled using standard panels. They usually have several buttons (regulators) that allow you to set the temperature, start or turn off the boiler. More modern dual-circuit devices are often equipped with external control modules (complex ones - you can work with them via the Internet, via a GSM channel and simple ones -). Such blocks make it possible to use the extended functionality of heating installations.

How to choose a gas boiler by power?

If you decide to do it yourself, you should draw up a detailed plan for such an event, consider the layout of pipes, chimneys and additional equipment. The work is going to be serious. And its success will largely depend on the correct selection of the heating boiler in terms of power. There are no special difficulties here. You need to remember the following.

If you live in an area with a temperate continental climate, you need to spend about one kilowatt of thermal energy to heat every 10 square meters of a private house, in warm regions - 0.8 kW. But for areas with a lower average annual temperature (Far East, northern Russia), by 10 sq. m. area is spent up to 1.5 kW of energy. Based on this, the power of the unit should be selected. A simple example. Your home is located in the European part of the Russian Federation. Its area is 100 squares. How to choose a boiler for heating a private house with such dimensions? Elementary. Multiply 100 by 0.1, you get the required power of the heating installation - 10 kW.

Important! About 15–20% more must be added to the calculated power. This surplus will keep you warm during particularly cold winters and in cases where heat loss occurs during boiler operation.

Below we provide a plate that will facilitate the calculation of the required power of the gas unit.

Let your house always be warm!

Wall-mounted boiler in the bathroom

The installation of gas boilers for heating a private house is most often resorted to when it is necessary to resolve the issue of organizing high-quality home heating. And this is no coincidence.

Some incidents constantly happen with centralized heating systems, and at the most inopportune moment you can be left without heat. And a gas boiler is a great way to create and constantly maintain comfortable conditions in the house according to your desire.

The main advantages of gas boilers

Modern wall-mounted boiler

Compared to other devices that provide heat to the house, gas boilers have several advantages:

Relative ease of installation and operation. The gasified heating system provides for the use of standardized fasteners and connecting pipes. This feature minimizes the occurrence of any difficulties during installation.
Part of the work on installing a heating system that operates on gas, you can do it yourself. However, commissioning and start-up activities must be carried out by qualified specialists.
Home gas boiler has a high efficiency. When using a pump for forced circulation of water in its design, such a system is capable of heating the most distant rooms with a large area in a short period of time.
Gas-fired boilers for heating a private house will save you a lot of money. After all, this type of fuel has a rather low cost. At least for now. You can calculate your estimated costs using a special formula. It is necessary to multiply the price of 1 cubic meter of consumed energy resource by the heated area of \u200b\u200bthe building.
Subject to all fire safety requirements, such a heating system provides a high level of protection against fires. In addition, the scheme of equipment for gas heating of a private building or apartment is designed in such a way that the risk of poisoning by products of incomplete combustion of fuel is reduced to zero.
The system is equipped with special sensors. They control the fuel supply, the presence of a flame and the temperature parameters, which makes the system absolutely safe.
The percentage of emissions of harmful substances resulting from the combustion of gas is very small, which positively affects the environmental friendliness of the process.
Despite the high power, modern boilers are as compact as possible. They fit into any interior without any problems, without violating its integrity.
The service life of steel boilers can reach two decades, and the durability of cast-iron units is about half a century, and sometimes more.

On a note! You can organize heating with cylinders without any particular difficulty if you do not have access to a centralized gas pipeline.

Some disadvantages of gas boilers

Checking the operation of the boiler

But along with the advantages, gas boilers also have disadvantages, which are much less:

Intending to carry out gas heating in your country house, be prepared for the fact that you will have to coordinate all activities with special government services that will develop a gasification project for your home. Moreover, all these procedures can be significantly delayed in time.
The installation of gas boilers will be especially beneficial only if the total area of the heated house is at least 100 square meters.

Types of gas equipment

Modern boilers can be made both for floor placement and for wall mounting.

Floor standing appliances are the most common option. Their installation must be carried out in rooms specially designated for this purpose with good ventilation. The area of the boiler room should be about 9 square meters. Installation is carried out at a distance from the walls, at least 0.5 meters.
Wall-mounted units are designed for heating small areas. Such boilers take up very little space and can be made with a combustion chamber or with a flow heating system.

It is necessary to mention the design features that you should pay attention to in the process of choosing heating equipment. The most important thing in this case is the material from which the main heat exchanger is made.

Varieties of heat exchangers

Boiler operation scheme

They are of 3 types:

Steel construction - used in economy class boilers.
Stainless steel products - widely used in wall-mounted devices.
Cast iron heat exchangers are the most reliable models that are mounted in the floor version.

Steel heat exchange systems are inferior to others in terms of technical characteristics, but they are much cheaper. Cast iron boilers and stainless steel construction options are about equal in power.

The cast-iron boiler has a high heat capacity due to its impressive mass and wall thickness. Stainless heat exchangers are more modern high-tech products. But a boiler for heating a private house, made of cast iron, can reliably last much longer than other devices.

Therefore, when installing a gas heating system, it is preferable to choose cast iron units. One of the main advantages of such equipment is its practicality, reliability and durability. It is quite possible that in the future you may simply not need to repair such a boiler, and occasionally it will only be necessary to carry out its maintenance.

The principle of operation of a gas boiler

Working principle of gas condensate boiler

The boiler works quite simply. Gas enters a special automatic unit. Its sensors regulate the fuel supply depending on the temperature in the heating system. Then it goes to the burners and mixes with air.

After that, the combustible mixture enters the furnace - the chamber, where it is directly burned. In this case, a large amount of energy is released, which is intended for heating the building.

Combustion products, passing through the heat exchanger, heat the water in the heating system. After that, they are removed to the atmosphere through the chimney.

The exhaust gas leaving the chimney has a temperature several tens of degrees higher than the air temperature outside the building. Therefore, chimneys must be made in full compliance with building codes and regulations.

Types of designs of heating boilers

In addition to the division according to the materials from which they are made, boilers are also classified according to the design of the furnace.

Structures with a closed firebox

Floor heating boiler

The boiler of such a gas heating system is equipped with a fan that forces the air flow into the furnace. This is necessary for high-quality combustion of fuel.

Through a coaxial pipe through which air is supplied, combustion products are also removed. Such units do not require the construction of chimneys, and they are ideal for installation not only in houses, but also in apartments.

Important! The undoubted advantage of this design is that the air purge of the furnace is carried out both before the fuel supply and after the combustion chamber is turned off. At the same time, the risk of gas ignition directly in the furnace itself is significantly reduced.

The heat exchange between incoming air and exhaust gases favorably affects the operation of the boiler. This improves the ignition moment, and the combustion flame becomes more uniform. The overall efficiency of such a device is quite high, due to which the owners receive significant savings.

Designs with an open combustion chamber

In the designs of classic boilers, the draft required to maintain high-quality combustion is created by the chimney. Such units are equipped with open-type furnaces. At the same time, the cost of construction is much lower than that of models with a closed combustion chamber.

But the absence of a fan in the device significantly reduces the efficiency. At the same time, the requirements for high-quality installation of the chimney channel pipe increase significantly.

Important! If in a boiler with a forced draft fan you can easily provide exhaust gases through the wall directly to the street, then in a heating unit with an open firebox this will no longer work.

Some features of the operation of gas boilers

wall boiler

Gas heating works, mainly due to the pressure of the liquid circulating in the system. The value of this indicator is extremely close to the atmospheric level or is in a slight excess.

In the first case, the functioning of the system is carried out under the action of a water column. The system has free communication with the atmosphere from the mark of the expansion tank to the control point.

In the second case, the complex operates at excess pressure. The exact figures are indicated in the passport of the heating gas generator. If the pressure rises above the limit specified in the documents, the safety machine automatically reduces it. If it crosses the minimum mark, then either the boiler turns off, or the system operates due to a special valve.

Important! The placement of the automatic safety device equipped with a pressure gauge and an expansion tank may be different. It is installed both separately and built directly into the gas boiler, which depends on the manufacturer and the specific model of the unit.

The circulation of water in the heating system can be natural or forced - under the action of a pump. However, most units designed for the use of devices for forced circulation are not supplied with them. Therefore, we recommend purchasing such pumps without fail. This will provide not only better heating of the premises, but also cost savings.

Attention! If you need not only to organize gas heating, but also to provide the bathroom and kitchen with hot water, then a double-circuit boiler will best cope with such tasks.

Modern gas boilers operating on liquefied gas are characterized by a significant degree of automation. They are equipped with an abundance of various sensors and valves of the electromagnetic type. An increasing number of models are equipped with electronic control, so that now the consumer can independently set the optimal heating modes for him.

Finally

Now you know what you should pay attention to when choosing gas boilers, what they are in terms of design, and what surprises you can expect from them in operation. We recommend that you use two-circuit units and pumps for forced circulation of water.

We hope that the materials presented will help you choose the right gas boiler. And with proper maintenance, you will get a reliable heating system.

Russia belongs to countries with a very harsh climate. In most of its territory, winters are very cold. Having heating in your home is vital. Practice shows that one of the best options for organizing the heating of a building is the use of gas as a fuel, and the most popular are outdoor gas units.

We will talk about what are floor gas heating boilers. From the article presented by us, you will learn how the equipment works, what it needs for stable uptime. In order to facilitate the selection of the optimal model, we analyze the main criteria and characteristics of the best options.

Manufacturers of gas boilers produce a variety of modifications of heating appliances. All of them can be divided into floor and wall devices.

The latter are compact and have good performance characteristics. And yet, many prefer outdoor equipment, which is explained by its significant advantages.

The advantages of floor boilers include:

Great power. The design of the devices is such that they are capable of delivering much more power than wall-mounted counterparts.
The presence of non-volatile models capable of permanently or temporarily working with a coolant moving without using a pump.
Equipment durability and reliability. Properly selected and installed boiler, subject to proper operation, can work for 50 years or more.
Economy and ease of operation. Floor boilers, unlike wall-mounted ones, are most often produced without built-in automation and additional equipment. This greatly simplifies the maintenance of devices, their repair and extends the service life.

Of course, the use of outdoor equipment involves some inconveniences and limitations. These include the mandatory presence of a separate room - in which the boiler should be placed.

There are a number of requirements for such premises, each of them must be strictly observed. Otherwise, it will not be possible to obtain permission to install and start gas equipment.

Gas boilers in the floor version are large and massive, but at the same time they are more powerful, reliable and durable compared to wall-mounted counterparts

The dimensions of the furnace or boiler room are selected based on the fact that not only the boiler, but also all the necessary additional equipment can fit here. The requirements of SNiP are also taken into account.

The need for furnace equipment increases the cost of installing the boiler. In addition, the arrangement of the chimney, floor preparation, etc. will also be required. Accordingly, the cost of installing a floor-standing boiler will be much higher than a wall-mounted one.

Varieties of floor heating devices

Boilers can be classified according to a variety of criteria. Let's look at the main characteristics that affect the quality of operation of devices.

Number of circuits in the device

The boiler can have one or two working circuits built in. In the first case, the device will only heat the coolant, that is, it will function as a heating device.

Such equipment is equipped with one heat exchanger, which greatly simplifies its design and reduces the size. True, the latter also depends on the power of the device. If single-circuit equipment is installed, an additional unit will be required to heat water.

If a single-circuit boiler is used in the heating system, then an additional water heater will need to be installed to provide the house with hot water

In this case, you can put in addition, for example, or any other device. Single-circuit boilers are chosen for heating objects that do not require hot water supply or for large houses, where all the power of the device will go to heat the building.

Double-circuit models are capable of simultaneously heating the coolant and heating water for domestic needs. Two heat exchangers are built in, which significantly complicates the design.

There are models with the so-called bithermic heat exchanger, which is divided into segments. The coolant moves along one of them, the heating water moves along the other. Such devices are as compact as possible, but less reliable and easy to use.

The best option can be considered units with two completely separate heat exchangers. They form less scale. In addition, the circuits are separated, so it is not necessary to block the heating segment at the time of dispensing hot water. Whereas in boilers with a bithermic heat exchanger, this is exactly what happens.

Double-circuit boilers are best used for small residential buildings. On large areas, mandatory separation of circuits is required, which is due to safety requirements, lack of total power, etc.

Combustion chamber type

Heating boilers can be equipped with an open or closed chamber. In the first option, only natural draft is used to operate the unit.

This assumes that the oxygen necessary for the combustion process enters the chamber from the room in which the appliance is installed. The boiler independently, without the help of any additional equipment, takes the amount of air necessary for its operation.

A boiler with an open chamber can operate without the use of pressurization, which makes it non-volatile. True, such devices require certain conditions for safe operation.

Thus, the room must be equipped with effective ventilation. In addition, for the normal operation of this type of boiler, it is necessary to install a vertical type, which will provide normal draft. Among the advantages of boilers with such a chamber are energy independence and relatively low cost, but they give out less power.

Devices with a closed chamber are distinguished by the presence of a fan that supplies air into the device and removes flue gases from it. Therefore, the boiler does not take oxygen from the room.

The chimney in this case is also significantly different. It is installed where two pipes are nested one inside the other. The internal one is intended for the removal of combustion products, and the outside air is supplied through the external one.

The coaxial chimney can be installed not only vertically, but also at some angle horizontally. The presence of a fan guarantees stable traction.

The closed chamber increases the efficiency of the boiler. This is due to the fact that there is a maximum afterburning of the fuel. Thus, the advantages of such boilers include higher efficiency, better efficiency, lower fuel consumption.

For gas boilers with closed chambers, the use of a coaxial chimney is mandatory. The system provides air supply to the combustion zone and removal of flue gases

In addition, they are safer due to the fact that the combustion cycle inside the device is completely isolated. Among the shortcomings, it is worth noting the volatility of devices, which is highly undesirable in areas where power outages are not uncommon. In order for the operation of the boiler not to be affected by interruptions in the supply of electricity, it is recommended in the equipment connection diagram.

Due to the operation of the fan, such boilers are quite noisy and their cost is much higher compared to analogues with an open chamber.

The material from which the heat exchanger is made

Floor-standing boilers can be equipped with three types of heat exchangers. Definitely say which one is better, it is difficult to analyze the features of each. The cast iron heat exchanger does not corrode. He is immune to heat shock and acid attacks.

With proper operation, such a part can last 20-30 years. The main disadvantage of cast iron is its brittleness, which is important to consider during its transportation and operation.

Before installation, it is recommended to carefully check the heat exchanger for cracks. In the process of using the boiler, it is very important to maintain the desired temperature regime and not allow a temperature difference between the return and supply of 45 ° or more.

Otherwise, the heat exchanger may crack. Another drawback of cast iron is its heavy weight, which makes it difficult to install the part and then dismantle it if necessary.

The best choice for a gas boiler is a cast iron heat exchanger. Such parts are not subject to corrosion, durable and reliable. The only significant drawback is fragility

Heat exchangers made of steel are lighter and more durable. They are not prone to cracking and are not subject to deformation. Their main disadvantage is susceptibility to corrosion and burnout.

Depending on the quality of the alloyed steel, the average service life of the steel assembly will be 10-15 years. If the operating conditions are violated, the part will fail much earlier.

Extending the life of a steel heat exchanger is quite simple. It must be ensured that the temperature inside the boiler does not fall below the “dew point” value for flue gases. If this happens, condensation will form on the walls of the part.

It is carbonic acid dissolved in water. Aggressive substance will damage the heat exchanger. Thus, it is necessary to constantly maintain a sufficiently high temperature inside the boiler, which leads to higher fuel consumption.

Copper heat exchangers are characterized by excellent thermal conductivity, corrosion resistance and low weight. However, they are rarely installed in floor boilers. This is due to the high cost and "capriciousness" of the metal. During the operation of a powerful outdoor appliance, copper wears out very quickly. For this option is more suitable.

Device burner type

The floor boiler burner can be one, two-stage or modulating. The first option assumes that the device always produces only one power level. Two-stage allows you to choose one of two levels.

Modulation involves smooth regulation (modulation) of the power output by the device. It must be understood that the maximum power of the heater is not always in demand.

The modulating type burner allows you to adjust the power of the boiler, which allows you to significantly save fuel

According to experts, it is used from 15 to 30% of the time when the device is working. The rest of the time it produces less power.

Thus, modulating or at least two-stage burners are more economical. They significantly increase the service life of the heater, which is explained by a decrease in the number of switching off / on the device.

The ability to operate at reduced power provides significant energy savings. In addition, the amount of flue gases and other combustion products emitted into the air is also reduced. Boilers with modulating and two-stage burners are suitable for use with boilers of various capacities.

Use of flue gases

Traditional boilers are convection-type appliances and are designed so that flue gases, together with water vapor, are immediately discharged to the outside. However, their temperature is high and this heat can be reused.

Condensing units collect the steam released during the combustion of gaseous fuel, after which the heat is redirected to the heating circuits. Due to the more complete use of the energy obtained during the processing of gas, the productivity of both the boiler itself and the heating circuit as a whole increases significantly.

The condensing boiler is able to use part of the heat from flue gases, which significantly increases its efficiency and reduces fuel consumption.

Thus, it is possible to achieve significant fuel savings and increase the efficiency of the boiler to fantastic 100% -114%. The disadvantages of condensing boilers usually include a more complex design, which significantly increases the cost. Convection appliances are simpler in execution and much cheaper.

Choosing a floor boiler: how not to make a mistake

Before you go to the store, you should carefully analyze the features of the heated object in order to clearly understand the operating conditions of the device. Based on this, the characteristics of the equipment are selected.

Gas unit power

One of the main factors determining the choice of the boiler. Standard recommendations suggest determining the required power of the device from the following ratio: 1 kW of power produced by the unit is required per 10 sq.m of the building.

However, this is a very average figure. It does not take into account the heat loss of the building, the height of the ceilings in the room, the number of doors and windows, their thermal insulation, and much more. If possible, a specialist should produce.

One more moment. It is usually recommended to select a boiler with some power reserve. This is fair, but this margin should not be large. Otherwise, this will lead to rapid wear of equipment and constant excessive consumption of fuel. For single-circuit boilers, the power reserve should not exceed 15%, for double-circuit boilers 25%.

Specificity of fuel consumption

If possible, it is desirable to choose the most economical boilers. These include all condensation models. Compared to traditional appliances under similar conditions, they consume 15-30% less fuel. The electronic ignition system will also help save money.

Standard piezo ignition requires constant operation of the pilot burner, which leads to excessive gas consumption. This is not required for an electronic system. Such boilers have a high cost, but in the process of operation, investments quickly pay off.

Double-circuit boilers are very convenient for small buildings, as they allow you to simultaneously heat the house and provide it with hot water.

Optimal number of circuits

It makes sense to think about purchasing a double-circuit boiler only if there is a need for hot water supply. In this case, it is worth installing a device with two circuits only in a building of a small or medium area.

For large houses, the installation of double-circuit boilers is impractical, since the power of the device for full-fledged work is most often not enough. In addition, the security of the system suffers.

Priority heat exchanger material

Copper is not considered in this case. Only steel or cast iron. The first option is chosen if you want to save money. But you need to be prepared for the fact that after a few years you will have to change the heat exchanger. For long trouble-free operation of the boiler, a cast iron assembly is chosen.

Construction type and performance

For floor gas boilers, efficiency is considered normal, varying in options from 80 to 98%. Condensation models differ in efficiency ranging from 104 to 116%. The higher this value, the more efficient the boiler is and uses less fuel.

For double-circuit models, the performance of the DHW system can vary from 2.5 to 17 liters per minute. The performance and power of the unit affect its cost, the higher it is, the higher the price of the device.

Best control system

The most convenient and safe to use are boilers with. They are able to function autonomously, without constant control of the owner. These are expensive complex systems.

It is also possible to use more budgetary manually controlled boilers, but in this case, its operation will have to be controlled by turning the device on / off to obtain a comfortable temperature in the room.

An excellent option in the operation of a gas boiler is the presence of a built-in thermostatic sensor. If it is not there, it is recommended to purchase and so as not to waste energy and not overload the heating equipment.

The most convenient to use are floor boilers with automatic control. They do not require constant monitoring, while working safely and efficiently

The rules for conducting gas equipment are given in the article, the contents of which we advise you to read.

Acceptable design and dimensions

The dimensions of the boiler and its appearance are selected based on the area of the furnace room. Manufacturers offer a wide range of different models of various designs and dimensions, which allows you to choose the device that is most suitable for a particular room. It is important to remember that the boiler and additional equipment must be provided with completely free access.

The best models are presented in the article, which details the selection criteria, provides all the arguments on the basis of which you can make a balanced purchase.

The best equipment: consumer opinion

According to the owners and maintenance specialists of equipment among foreign manufacturers, the German brands Bosch, Wolf, Buderus, Vaillant, the Slovak brand Protherm, the Italian BAXI and the Korean Navien can be considered the best.

Of domestic manufacturers, Zavod Konord from Rostov-on-Don and Zhukovsky ZhMZ have proven themselves well. Consider several models recognized as the best.

Bear 30 KLOM by Prothrem

Floor single-circuit device with an open chamber and a heat exchanger made of cast iron. Equipped with a modulating burner made of stainless steel. There is a possibility of arranging forced removal of flue gases.

The heat exchanger is equipped with a condensate protection system, if necessary, its sections can be replaced. The boiler is compact in size, has a cooling circuit, an automatic control system and two operating modes "Summer-Winter". The power of the device is 26 kW.

EcoVIT VKK INT 366 from Vaillant

The single-circuit boiler operates using condensing technology. Able to heat up to 340 sq. m, power - 34 kW. If necessary, provide domestic hot water is well compatible with an external storage boiler. The model has an efficiency of more than 100%, which makes it very economical.

Floor-standing boiler Comfort from the Zhukovsky plant is an excellent budget solution for providing home with heat

Equipped with a multi-sensor control system and a closed-type modulating burner. Economical electronic ignition is used for ignition. The boiler can be connected to an external control, which allows it to be integrated into or controlled remotely.

AOGV-23.2-3 Comfort N from Zhukovsky plant

Inexpensive domestic boiler with improved environmental performance. Fully adapted for operation in Russian conditions, able to operate stably at low gas pressure.

Non-volatile, can be built into systems with gravity or forced circulation. Equipped with a pointer thermometer and piezo ignition. Extremely easy to operate and maintain. The burner is easy to clean and replace.

An overview of popular models of gas boilers operating on liquefied gas will be introduced dedicated to this issue.

Floor boilers are the most practical choice for arranging autonomous heating. If necessary, you can choose a double-circuit model and provide not only heating the house, but also the supply of heated water.

Among the variety of heating devices, it is important to choose the right device that is most suitable for specific operating conditions. You should not save and buy a clearly low-quality, but cheap device. A good boiler will work for a long time and will pay for its cost many times over. With it, your house will always be warm.

Among all types of boilers, gas units are perhaps the most popular and reliable. And this is not surprising, because our country has vast gas reserves, and this type of fuel is widely distributed even in remote settlements. However, even these seemingly well-known devices have a large number of differences, functions, installation methods and operating modes. As part of this review, we will try to disassemble gas boilers for heating a private house. How to choose the best option and prioritize for ordinary users? Let's find out.

Variety of boiler equipment

Read in the article:

Gas boilers for heating and hot water supply of a private house: how models are classified

The modern heating market has an incredibly huge range of gas equipment. For a general understanding, let's consider the classification of gas boilers according to various criteria.

Classification of gas boilers according to the main criteria

If we talk about a simple design, then household gas boilers are classified according to the following parameters:

Classification Options	Construction type
Mounting method	Floor and wall hanging equipment
Burner type	Atmospheric, ventilation and modulated
According to the way of traction	natural and forced
Production material	Steel, copper, cast iron
Dependence on the electrical network	Dependent with independent start, dependent without start, independent
coolant	antifreeze and water

Note! In order to choose a good gas boiler for a private house, it is necessary to determine for what purposes it will be used and what area to heat.

Advantageous features of high-quality gas boilers:

The equipment provides a built-in automatic mode, which allows you to monitor the gas pressure.
In the event of a malfunction, the sensor sends a signal about this to the electric ignition system, after which the device continues to function normally.
The efficiency is very high, and the price of fuel is low. At the same time, the heater gives off a lot of energy, but at the same time consumes much less.
With the help of a gas boiler, you can heat quite large rooms or entire objects.

How to choose gas boilers for heating a private house according to functional features

From the correct choice of equipment, first of all, the durability of the boiler and the efficiency of its work will depend.

There are several main criteria for choosing when buying:

Material.
Gas consumption.
Availability of automatic mode.
Price policy.

Before buying equipment, it is imperative to calculate the required power for heating your particular home (below is a handy illustrated calculator). Here is an example of a simplified calculation for a small house:

If the room has 100 m², you will need a boiler at the rate of 1 kW / 10m².
The power indicator of the gas boiler should be 10 kW.

This is a very simplified example that does not take into account the individual characteristics of each building. But in general, the order of numbers is like this.

Related article:

Note! In certain places, you will need to cut some pipes with a grinder. New equipment requires new components.

After all, the equipment is dismantled. If wall-mounted equipment is being dismantled, then you need to take care of stable support so that it does not fall. The work is best done by two people.

How to install a new boiler

Connecting gas equipment

The scheme for installing a gas boiler in a private house includes a connection to:

water pipe;
gas pipeline;
heating system;
heating and plumbing return.

Note! Installation can be done independently only if there is experience in performing this work.

Connecting a double-circuit gas boiler

The connection diagram of a double-circuit gas boiler must include all the necessary piping. When you find a place, you need to carefully consider how to remove combustion products. The boiler is supplied with special mounting brackets. Only after the boiler is securely fixed, you can proceed to the connection of gas and water supply.

The kit includes:

Component	Description
Filters for rough water treatment	These are special cleaning devices that are designed to clean debris from pipes so that it does not get inside the boiler.
Magnetic direction filter	Removes scale and rust.
Gas filter	Installation is required. Extends the operating period and prevents dust from entering the boiler.
Ball valves	Disconnect the boiler from the main for repair work.
Expansion tank for heating system	First of all, this is a guarantee of durability.

During installation, it is imperative to comply with fire safety requirements:

There should be a distance of about 0.5 m between the appliance and the wall.
The gas boiler must not be installed next to a window opening.

Note! If electricity is needed to operate a gas boiler, then it is better to place the equipment closer to the source.

How to choose a voltage stabilizer for gas boilers for a private house

Specifications:

Power 23.2 kW.
Fuel consumption 2.3 m3 per hour.
Atmospheric burner made of steel.
Weight 52 kg.
The price of a heating boiler for a private house is 23 thousand rubles.

Unit "AOGV-11.6-3 ECONOMY" and its characteristics

This type of equipment is volatile and is intended for heating for numerous small buildings.

The reservoir has a number of features:

Power up to 25 kW.
Fuel used: natural gas.
The plug with a diameter of 4 cm for connection is mounted in the rear part.
The chimney channel is located at the top.
Models meet, with one and two interruptions.
The cost of equipment is 15 thousand rubles.
Steel heat exchanger.

A small boiler with a power of 11 kW will give about 4-5 liters of liquid.

Features of the gas boiler "BUDERUS LOGANO G234 WS-38"

Model characteristics:

Power 38-60 kW.
Cast iron heater.
Atmospheric burner.
Automatic device.
Connection of the "warm floor" system.
Possible heater connection.

The equipment is made for heating various types of premises up to 380 sq.m. Thanks to the cast-iron heat exchanger, the service life is up to 15 years.

The equipment can be operated even at very low temperatures. To operate the boiler, you will need a connection to a 220 V network. The boiler provides for an open combustion chamber.

"BAXI SLIM 2300 Fi" - a great sample at an affordable price

The power range in this model range is from 16 to 63 kW. Modern design and small dimensions make it easy to install equipment in any interior.

Description and operation:

The Baxi Slim 2300Fi gas boiler with a built-in boiler and in heating mode provides for electronic modulation of fire.
Electric ignition turns on very smoothly.
There is a mode of reconfiguring the system for burnt gas.
Steel sample of the burner.

Hydraulic system characteristic:

The heat exchanger is made of cast iron.
Built-in high speed circulation pump.
There is a pump for heating water.
Pressure gauge.
It is possible to connect an external storage heater.

How is the temperature controlled?

There are two ranges for temperature control.
Automatic mode, sensor connection system for outdoor temperature control.
Built-in automation with maintaining the temperature regime in the heating circuit.

There is a temperature display.

Fourth generation equipment "VAILLANT ecoVIT VKK INT 366"

Due to its high performance and power, the equipment has become a leader among the gas industry in Germany. The model gained popularity due to the built-in diagnostic system. Therefore, the equipment works more efficiently, while saving the electrical system.

Advantage Features:

The efficiency is 98-109%.
Power modulation from 35 to 100%.
Additional heat is used due to the fact that vapor condensation occurs.
There is a forced outlet to the pipe.
There is a steel heat exchanger.
There is low temperature protection.
Electric ignition.

Along with the above indicators, 2 modes of fuel operation can be noted. Water is heated in layers, there is an electronic ignition system, there is control over gas pressure.

Rating of wall-mounted gas boilers: the best models

If we talk about the choice of boiler equipment, then the brand plays an important role for many users.

Below we consider the functional features of popular wall appliances.

Excellent sample "WOLF CGG-1K-24" and its characteristics

Functional features of the equipment:

The gas boiler works even with a significant mains voltage from 40 to 400 watts.
High efficiency of 90%.
Functioning occurs even with unstable gas pressure.
Water is heated even at a pressure of 0.4 bar.
Mounted gas boilers Wolf CGG-1K-24 simulate power up to 23 kW, this allows you to select the desired mode of operation and save gas.
A copper heater and a burner will allow you to create the necessary efficiency mode.
Automatic temperature control.

Specifications:

Fuel: natural gas.
Power 25 kW.
Tank volume: 6 liters.
Temperature range: 30-90 degrees.
The temperature regime of a double-circuit turbocharged boiler is 30-60 degrees.
Weight: 29 kg.
Price: 55000-65000 rubles.

"BAXI LUNA 3 COMFORT 240 Fi" is one of the best boilers

Suspended sample with 2 interruptions is made for buildings with an average quadrature.
There is a built-in panel, which is a temperature sensor.
Also the model is equipped with the high-speed circulating pump.
The tank has a volume of 8 liters.

The operation of the system for heating a private house:

In the heating system mode of the gas boiler, electronic flame control operates.
The burner is made of stainless steel.
There is a fuel switching mode.

Control and security system:

There is a special reliable protective device against low temperature conditions.
There is a safety valve.
A draft sensor is provided for equipment with a closed chamber.
The safety lock system is activated.
There is control over the flame.
There is a built-in system that remembers the last mistakes.

The price of a double-circuit gas boiler for a private house is 51,000 rubles.

Boiler "NAVIEN DELUXE 24K": comfort and reliability

Samples of the Korean company are in demand because of their low cost and excellent quality.

Characteristics:

This type of gas boiler has two heaters.
Another important point is that the manufacturer produces all the details of the boiler independently.
There is a special built-in chip that reliably protects the equipment from sudden power surges. This protection is present in the German manufacturers of Vailant, but the sample already belongs to a completely different price category.
And the most distinctive feature of the Navien Deluxe 24KCoaxial gas boiler is the control unit with a digital display. The display warns all faults and errors, the control mode is manual.
Another important point is a special built-in sensor for the temperature in the room.

Absolutely all components are included with the boiler. The price of the equipment is 25 thousand rubles.

Gas boiler "PROTHERM GEPARD 23 MOV" and its features

Equipment with two interruptions are created with a power of up to 25 kW.

Installation can be made absolutely in any room and has the following characteristic features:

The burner flame is modulated automatically.
There is a built-in circulation pump.
The tank has 5 liters.
The heat exchanger is made of steel.
The switching mode is automatic as soon as the hot water tap is opened.
There is a built-in operating display indicating errors, temperature and pressure.

The price of equipment is 35,000 rubles.

One of the best models "BOSCH GAZ 4000 W ZWA 24-2 A"

Functional features:

There are two heat exchangers for hot water preparation.
Steel burner.
8 liter tank volume.
Circulating pump consisting of three layers.
There is a modulating gas valve.
The boiler works in dual mode with fuel.
There is a built-in power control modulation system.
The temperature is indexed.
Low noise level.
There is a built-in make-up tap.

"VAILLANT ecoTEC PLUS VUW INT IV 246" performance data

This type of equipment provides economical fuel consumption and the highest level of environmental performance.

Before choosing a gas boiler for heating a private house, consider its functional features:

There is a specially developed electronic system (gas-air).
Stainless steel heater.
Excellent pressure regime, both in the circuit and in the boiler.

Excellent multifunctional display with built-in backlight.

Conclusion

Summing up, we can conclude that the best boiler is the one that works without breakdowns, so you can follow some tips:

When choosing equipment, make sure that it does not exceed the rated capacity.
The best material for a burner is steel.
A secure system should have a minimum set.
All pipeline boilers are best selected from steel raw materials.
The problem with heating involves the use of a double-circuit boiler.