How to choose a double-circuit gas boiler for your home?

Autonomous gas heating will only be effective and economical when all the technical nuances and everyday needs of the inhabitants of the house are taken into account during its design and installation. A gas boiler is a key element of an autonomous heating system, so even at the project stage you should decide on the type and type of gas heating equipment. Finding out which boiler is better in each specific case, floor-mounted or wall-mounted, single-pipe or two-pipe, is a complex task and deserves a separate article. Let's try to figure out the situation, how to choose a double-circuit gas boiler for your home if you decide to choose units of this particular type.

In this case, you will have to choose according to many criteria. Each aspect has a specific meaning and plays a corresponding role in the operation of the home heating system. The level of comfort at home ultimately depends on your choice.

What determines your choice?

If you are the owner of a city apartment or the owner of a small private house, your choice in favor of double-circuit boilers is quite reasonable and obvious. The main aspect that most often determines such a decision is the desire of homeowners to receive several engineering and technical solutions at once, “two in one”, independent heating and hot water supply. Today there is a huge amount of information available to the average person on the topic of gas boiler equipment. Let's try to figure out what exactly we need, which model to give preference to, and what technical parameters of double-circuit boilers we should pay attention to.

To begin with, you should clearly outline the range of requirements for an autonomous heating system, which arise from the existing technical living conditions and your own domestic needs. Eg:

what area of your house, apartment, country house requires heating;
what are the climatic conditions of your region;
at what time of year the operation of the heating system is most relevant;
what is the duration of the heating period for your home;
what is the on/off cycle of the gas boiler;
the actual number of inhabitants of a residential building;
the level of domestic comfort in the house, including the intensity of heating, the degree of furnishing of housing with external thermal insulation and the possibility of hot water supply;

Having answered these questions, you will be able to approach the solution of the problem in more detail and independently choose a model of a double-circuit gas boiler for your apartment or private house. Often the choice determines the cost of the units, methods and conditions for installing gas boilers in specific conditions.

Features of installing such a boiler

When installing a gas boiler, many important points must be observed to ensure safe and accurate operation of the heating installation:

The installation location of the unit must be approved by gas services and comply with all standards.
The system connection project must initially be drawn up on paper and then agreed upon with the gas company employees.
Specialists from the relevant service must install meters to monitor fuel consumption.
Before installing the boiler, it is recommended to check its complete configuration.
First, you should mark on the surfaces all the points where the equipment will be installed.
Next, connect all systems in series.
After this, the first test filling of the circuit with coolant is carried out.
Then a test firing of the boiler is carried out.
If there are any problems during the first start-up or you smell gas, it is better to call a specialist to inspect the system.

Specifications

The first thing you need to pay attention to is whether a double-circuit boiler is suitable for your water supply system. Malfunctions of the cold water supply system can lead to serious damage to heating equipment.

Important! When choosing a gas boiler model, it is necessary to find out the ability of the structure to respond to changes in operating pressure in the cold water system. Manufacturers usually indicate in the accompanying documentation the minimum operating water pressure threshold required to turn on the boiler and its subsequent operation.

Double-circuit boilers are usually used for heating in small residential buildings, where hot water supply does not require a long pipeline. An essential point is the number of inhabitants in the house. If several hot water distribution points are used simultaneously and intensively, there is a high probability that the volume of hot water will be insufficient for domestic needs.

For example: it is better to install a gas boiler in the kitchen or bathroom, where there is no need to lay a long water supply pipe. If the hot water supply pipe is more than 7 m long, the waiting time for hot water to flow from the tap will be long.

Useful tips

Installation in the kitchen

If you purchased a double-circuit wall-mounted gas boiler, it must only be hung on a solid wall. After all, its weight is still quite impressive.
Only representatives of the gas service have the right to connect the boiler to the gas pipe and make the first start.
If you need to select a dual-circuit unit, use two components for the calculation. The first is heating. It must correspond to the formula - 1 kilowatt of thermal energy per 10 square meters of heated area with a ceiling height of no more than three meters. Second, a standard boiler can heat up to 15 liters of hot water. If you are not satisfied with something, purchase a unit of greater power.
When purchasing foreign models, it is necessary to adapt the unit to domestic conditions. Abroad, the pressure in gas lines is higher.

What is a double-circuit gas boiler?

The first thing that captivates you about double-circuit boilers is their compactness. Indeed, in terms of their dimensions, such models simply fit perfectly into the layout of a city apartment, and are convenient and practical for installation in a small private house. Having studied in detail the technological capabilities of each model and their functionality, you can choose a gas boiler that best suits your needs and technical requirements.

Most often, double-circuit boilers are mini-boiler rooms equipped with all the functions necessary for domestic use. The wall-mounted version is more practical and convenient. Modern models are able to effectively solve the problem of heating residential premises and provide residents with hot water for household needs. The presence of automation ensures a high degree of reliability of the units.

Review of popular manufacturers and models

The market for modern gas equipment offers customers a large number of high-quality appliances designed for heating residential premises and supplying hot water.

Among the mounted units, the most popular are:

Navien DELUXE 24K (South Korea) – efficiency, good functionality and reasonable cost;
Baxi MAIN 5 24 F (Italy) – budget price, high level of efficiency, long service life;
Vaillant turboTEC pro VUW 242/5-3 (Germany) – reliability, high-quality heat transfer.

In addition to the above qualities, the models are distinguished by their attractive appearance, compact dimensions, fit into a variety of interiors and can be easily placed even in small rooms with complex layouts.

A gas appliance with two circuits from the German company Vaillant has a convenient control knob and a display on which you can see the level of heating of the coolant at the moment

Of the floor-standing units, the most popular are the high-power (30 kW) ATON Atmo 30E, the practical Lemax Premium-25B and the more expensive, but very functional Navien GA 17KN.

Navien GA 35KN, despite its high power, uses fuel reasonably and allows owners to save on utility bills without compromising personal comfort

Baxi SLIM 2.300 Fi and Protherm Bear 40 KLZ are part of the premium line of equipment. They have advanced functionality and reliably serve for many years. In all parameters and physical characteristics they comply with the most stringent European standards (confirmed by certification certificate CSQ and UNI EN ISO 9001).

For a small room (up to 50 sq.m.), a boiler with a base power of 7 to 12 kW is suitable. If the real estate area is larger (for example, 150-200 sq.m.), it is better to purchase a 23-25 kilowatt device

Weak units simply cannot provide full heating to an apartment or large house.

You should buy floor-standing gas boilers and wall-mounted models only in branded stores or official representative offices of manufacturing companies. There, the client will be told in detail about the operating principles of this or that unit and will be helped to make the optimal choice.

Features of the internal structure and technical parameters of the units

Wall-mounted double-circuit boilers are today the most common type of heating equipment that can be found in a city apartment. Compared to single-circuit boiler models, such units are much cheaper. The optimization of all equipment installed inside the structure itself has an impact.

For comparison: the lightness of the entire unit is achieved through the use of heat exchangers made of stainless steel and bimetallic material in the design. Instead of a storage tank for hot water, the design uses a flow-through heating method. To create the required pressure in the system, usually one, or less often two, circulation pumps are installed. All other structural elements - sensors, automation, main and safety valves, gas burner are small in size, closely interact with each other and are arranged in a small volume.

The diagram below shows the structure of a two-pipe household gas boiler and the principle of its operation.

A floor-standing boiler is much more powerful and heavier. Cast iron or steel heat exchangers, a storage tank for hot water (indirectly heated boiler) - all this and much more have significant dimensions and weight, which places increased demands on the strength of the floor of the room. To install a floor-standing double-circuit gas boiler, you will need a special place or even a separate room, which must have a good exhaust hood and be equipped with a chimney. Such units are usually installed in large country houses, in private residential buildings of two or more floors.

As for choosing a specific model of a wall-mounted gas boiler, here too you should take your time. For efficient operation of gas heating equipment, draft is required, due to which the fuel burns in the furnace. Some models are designed for natural draft, while others, on the contrary, are equipped with fans for forced ventilation. Comparing both options, there is a lower cost for units with natural draft and an open combustion chamber. On the other hand, in this case you will need to organize a chimney, which must strictly comply with all technical norms and standards.

Note: a bulky chimney pipe is not suitable for a city apartment. Which of your neighbors will like smoke in their apartment from your chimney?

* Models with a closed firebox and forced ventilation are more expensive, however, they are more practical and reliable in operation. For a double-circuit boiler with a closed combustion chamber, a coaxial chimney is installed, which is a compact pipe acting at the inlet and outlet. Such structures are small in size, do not require much space, and can be installed in a city apartment.

What to pay attention to: if hot water is used intensively in the house, it is better to equip the heating system with a gas boiler with an additional storage tank for hot water. The reserve is 50-60 liters. will be appropriate in any situation. The built-in boiler will ensure constant water pressure in the system and maintain the required hot water temperature.

Technical characteristics, main differences

There are many models of heating units available on the market, which differ in a number of important technical parameters.

Power

The most important criterion on the basis of which a model of heating equipment is selected. When calculating this parameter, the following factors are taken into account:

room area;
area of doors and windows;
thermal insulation characteristics of walls, roof and floor;
the presence of an attic and basement;
climatic conditions.

Power is an important criterion for choosing a gas double-circuit boiler.

In general, to provide heating 10 square meters. m of area must account for at least 1 kW of unit power.

Ignition functions

The burner can be ignited:

manually - with matches or a lighter;
using a piezoelectric element;
electric ignition system.

In gas appliances equipped with an automation system, the latter option is often implemented.

Traction options

Natural or forced draft is used to remove flue gases. Boilers of the first type have a simplified design. The combustion products are released through a vertical chimney. Operating efficiency depends on the stability of the gaseous fuel pressure. If the gas supply is interrupted, the risk of burner wear increases and fuel consumption increases.

Forced draft boilers are equipped with a fan, which is used to remove flue gases. Disadvantages - increased noise, dependence on uninterrupted power supply. Advantages: high efficiency, ease of installation, no need for a vertical chimney.

Craving can be natural or forced.

Material of manufacture

The outer casing of most models of gas equipment is made of steel. For some elements protected from high temperatures, heat-resistant plastic can be used.

The following materials are used in the manufacture of heat exchangers:

cast iron - is corrosion resistant, retains heat for a long time, but is fragile and heavy;
steel - the material has low density, high mechanical strength, can withstand temperature changes, but is prone to corrosion;
copper - has better thermal conductivity characteristics, is resistant to corrosion, and has a high cost.

Automation

A gas boiler is a complex device whose operation is controlled by automation. To ensure safe and reliable operation of the installation, the following parameters are constantly monitored:

gaseous fuel pressure;
presence of flame in the burner;
presence of traction.

The gas boiler is controlled automatically.

The automation blocks the operation of the boiler if any of these parameters are violated. Many installations have advanced functionality and control capabilities:

Post-circulation mode, which allows you to extend the service life of the equipment. To do this, the circulation pump continues to operate for some time after the burner is turned off to avoid local overheating in the circuit.
Maintaining the set temperature. The technology makes it possible to increase the efficiency of equipment and reduce fuel consumption. In this case, the air temperature in the room or the temperature of the liquid in the heating circuit can be controlled.
Anti-freeze mode to reduce gas consumption. If the unit is used in a country house or country house that is rarely visited, you can set the economy mode. It will maintain the circuit temperature at +5°C.
Summer heating mode. During the warm season, the unit does not operate for heating. To avoid stagnation and precipitation of hardness salts, the device will periodically turn on the coolant circulation for a while.

Automation

For gas heating devices, one of the most important design elements is automation. Today, not a single model of gas boiler is produced without automatic devices for monitoring the operation of heating equipment, which can be mechanical or electronic. The choice of equipment in this case is up to the consumer.

Models from foreign manufacturers are almost all equipped with electronic automation devices. This approach makes modern heating equipment high-tech devices capable of operating in various modes and independently monitoring the current state of all elements of a single mechanism. A significant obstacle for many consumers is the cost of such boilers. In some cases, gas boilers equipped with electronics become hostage to the power supply system. No electricity, no heating. Frequent breakdowns and failures of gas boilers with electronics entail additional costs for repairs and maintenance of equipment.

For reference: gas boilers equipped with electronic automation more often fail due to breakdown of the electronic components of the system (every second boiler breaks down due to faults with the electronics). Frequent power outages and power surges negatively affect the operation of gas heating units with electronic automation devices.

The optimal option for our conditions would be to purchase a boiler with an independent power supply or with mechanical control devices. Such models are a budget option. They are practical and unpretentious in their work.

Model differences in power

Double-circuit boilers are divided by power into single-stage and two-stage. Single-stage devices always operate at a constant power level and use the same amount of fuel resource year-round.

This is not effective and entails excessive gas consumption, because a house or apartment requires high-quality heating for no more than 5 months a year. At all other times, running the equipment at full power is neither reasonable nor economically profitable.

When installing equipment with a base power of 30 kW, you should know that these types of devices should not be located in residential premises, but in separate rooms equipped with a high-quality ventilation system, individual access to the street and a full-fledged chimney

The functionality of two-stage devices is wider.

With it you can:

regulate the gas flow regime and rationally consume fuel;
reduce the number of on/off switches, thus reducing equipment wear and extending its service life;
reduce the volume of harmful emissions into the air to a minimum.

Additionally, the device is equipped with a smooth switching module, which reduces energy consumption and allows you to simultaneously operate a boiler and a boiler of any capacity, installed separately.

Boiler power. What should you pay attention to?

The key points that influence your choice may be the power of the boiler. You should not immediately settle on high-power gas two-pipe boilers. The technical progress that we have achieved allows us to produce models designed for different household needs. The main thing is to objectively approach the requirements that you place on an autonomous heating system. Choosing a double-circuit gas boiler will be successful if you have a ready-made project at hand and you listen to the advice of experts.

The table clearly shows how you can determine the optimal boiler power in each specific case

It should be noted that many owners of apartments and private houses mistakenly approach the issue of determining the optimal power of a heating unit. There is a misconception that all mounted models of double-circuit gas boilers have a power of 24 kW. A detailed acquaintance with the offer on the market will clarify the situation for you. Typically, the power of such models varies between 17-35 kW. A key aspect of determining power is the number of hot water intake points in the house. It is necessary to select a double-circuit gas boiler taking into account the rule - the more hot water taps, the more boiler power is required.

For example: a private house with an area of 200 m2 can be fully heated by a double-circuit boiler with a capacity of 24 kW. However! If the house has two bathrooms, then this power will not be enough for normal hot water supply. Therefore, when buying a boiler, you need to take into account the number of hot water intake points.

Of the total boiler power, a third is spent on heating, that is, 5-10 kW. The remaining kilowatts are used to heat water in the hot water supply system of a residential building. In other words, 30-40% of the boiler power is enough to heat the house, the rest of the power is necessary for the normal operation of the hot water system.

Having settled on the optimal power parameters of the gas boiler, add another 10-20% to this figure, taking into account the heat losses that are inevitable when operating an autonomous heating system. In many ways, the amount of heat loss depends on the thermal efficiency of a residential building. Timely work done to insulate living spaces in a house or comprehensive insulation of apartments will allow the heating equipment to operate at optimal levels.

Gas heating

There is no point in saying that heating based on natural gas is the most economical option. Everyone knows this. But recently, the justification of this type of heat production has been called into question. The fact is that alternative fuels are gradually becoming conventional. And only because the extraction of natural resources is becoming more and more expensive every year. Wind heat generators, heat pumps, solar systems are what are increasingly used today for heating homes. For now, alternative fuels are still expensive, but we’ll find out what happens next in 20–30 years.

In any case, natural gas is the cheapest type of fuel today. Therefore, many consumers try to connect a gas pipe to their home. By the way, liquefied gas costs 6 times more.

What kind of heat exchanger should be in a double-circuit boiler?

If you set out to ensure maximum comfort in your apartment, you should not go to extremes and try to buy everything at once. It is important to remember: “better is the main enemy of good.” Modern wall-mounted models of double-circuit boilers are available with two types of heat exchangers:

separate products;
bithermal devices;

Separate product units are boilers that have two heat exchangers. The main or main one is used to heat the coolant in the heating system, while the secondary heat exchanger is designed to heat water in the hot water supply system. In the first type, the main work is done by heating the heat exchanger, which is responsible for the operation of the heating system. The secondary heat exchanger is already by indirect heating due to the heated water coolant in the DHW system.

When choosing such a model for yourself, be guided by its fairly high cost. The reason for the high price is the larger number of individual elements and additional functions.

Note: A significant advantage of boilers with separate heat exchangers is the absence of scale formation in the heat exchanger, which provides indirect heating. In addition, this scheme completely eliminates boiling of water in the system.

The second option is that boilers with bithermal heat exchangers have dual elements. During operation of the boiler, simultaneous heating of the coolant for heating and water for the hot water system is carried out. Accordingly, in such systems scale forms faster and the permeability of the coolant and hot water in the pipeline deteriorates.

Advantages and disadvantages

When choosing a suitable heating device and water heater for plumbing, you should consider the pros and cons of the devices in question.

The advantages of these boilers include:

the presence of a second heat exchanger allows you to effectively organize the process of heating the medium for the water supply and for the heating circuit;
most devices are equipped with automatic devices - this function increases productivity and reduces fuel consumption;
a variety of models of two-level devices allows you to solve the issue of organizing heating and water supply in any area;
an automatic device adjustment system allows you to create a comfortable mode in the room, which cannot be done with centralized heating;
durability (with proper use).

Negative properties include:

installation of a floor-standing device will require the allocation of a separate, specially equipped room;
the costs of installing large and complex systems can reach impressive amounts;
for uninterrupted operation of the boiler, water with certain characteristics and without foreign impurities is required;
the need to obtain special permission to install some devices.

We create the necessary level of comfort

The choice of boiler equipment must fully comply with the requirements for an autonomous heating system. What can influence the efficiency of a double-circuit boiler? Changes in outdoor temperature depending on the climate conditions of the region in which you live.

An extensive range of double-circuit boilers allows you to independently determine for yourself which method of controlling gas heating equipment is most suitable for you. Today, models of units are produced with the following types of power control systems:

single stage;
two-stage;
three-stage.

The most common and popular are models that use a two-stage boiler power control system. It is these boilers that are easy to adapt to seasonal and daily changes in air temperature. The ability to adjust operation in two modes ensures optimal heating of the coolant in the system, depending on whether it is warm or cold outside. Adjusting the heating intensity significantly extends the service life of the burner and heat exchanger.

Boilers with a single-stage adjustment system are less convenient to operate. Such models are much cheaper, and this, naturally, determines the limitations of their technological capabilities.

Gas boilers equipped with three-stage power control devices are an order of magnitude more advanced than other options. Such units are completely universal and autonomous in operation, however, the high cost limits the popularity of the use of these high-tech devices.

Approximate cost

The price of boilers depends on the brand and technical characteristics. The table provides information on the estimated cost of some models of gas boilers that are popular among domestic consumers.

Model name	Price, thousand rubles
Buderus Logamax U072-24K	35-40
Baxi ECO4S 24	45-50
Leberg flame 24 asd	38-43
Ferroli Divabel F24 dual circuit	30-34
Navien deluxe 16a white	30-35
Viessman vitopend 100	46-48
Baxi nuvola 3 comfort 240 fi	95-100

Which manufacturer should you choose?

Autonomous heating is not a one-day project. Your comfort not only today, but also in subsequent years, depends on the choice of boiler model and other elements of the system, so you should not save on equipment in this case. The only way out of this situation is to carefully study the existing offers on the market and take into account the reputation of the manufacturers.

Well-known companies and firms in the world that produce heating equipment try to maintain their brand and value their reputation. Boiler models from leading manufacturers are reliable, practical and easy to use. The slight difference in cost is compensated by the absence of problems with the equipment during operation.

However, you should not blindly believe in the reliability of models from foreign manufacturers. There are often cases when imported equipment turns out to be completely unadapted to our realities. The efficiency of a gas boiler can be affected by the quality of the coolant. It is also important to have a repair and maintenance base in your region. Buying a unit for which it is difficult to get components and spare parts, and which will also have to be repaired in a makeshift way, is the most ridiculous mistake. Take your choice responsibly in all aspects! The ideal choice is to purchase equipment adapted by the manufacturer to Russian conditions.

The most top manufacturing companies

Vaillant is a German concern that produces equipment almost all over the world;
Buderus is another German manufacturer that produces energy-efficient and functional models;
Baxi is an Italian company that produces classic, high-quality models;
Protherm is a Slovak company whose products are popular due to their affordable prices;
Lemax is a domestic leader that produces not only domestic boilers, but also water heaters.

Combined models

A high percentage of efficiency, the ability to independently monitor and control the combustion process - this is the advantage of combined models. They work not only with wood - you can also use gas.

Combination boiler Kiturami KRM 30R 35 kW double-circuit

Convenience and simplicity: what else do you need?

This unit has 2 chambers: for solid fuel and for liquid fuel. Among the functions it is especially pleasant to see: protection against excessive heating of the device, light notification about turning on and off, automatic ignition.

The package includes a remote control and a thermostat (it can be installed in the room to control the temperature).

Mains voltage is single-phase. The heat exchanger is made of high quality steel. The box is installed on the floor.

Specifications:

warranty period: 24 months;
weight: 170 kg;
dimensions: 855x1360x700 mm;
liquid pressure in the circuit: 2 bar;
hot water productivity at 25°C: 10.4 liters per minute.

Advantages

durable steel body;
affordable price;
heats a large room;
ergonomic;
comfortable;
easy to find on sale.

Flaws

no tank;
no pump;
massive.

Combination boiler ACV Delta Pro S 45 44.3 kW double-circuit

Reliable, efficient, environmentally friendly.

This stylish boiler contains polyurethane (insulation) and operates on several types of fuel. The burner can be BMV1 or any other one from the market that meets the parameters.

There is a connection to the chimney, there is a kit for a closed combustion chamber. The controls are intuitive: switch, control thermostat, thermometer, “winter/summer”.

You can install an ACV control unit (a corner is allocated for it). Fuel type: diesel or gas. Boiler volume - 65 liters. The efficiency level at 80/60°C is 92.8 percent.

Specifications:

power: 55kW;
DHW capacity: 362l/10min (Δt 30 °C);
weight: 168 kg;
chimney connection (mm): 100;
boiler heating time from 10 to 80°C, (min): 16;
thermal power: 44.30 kW;
parameters: 540x1615x584 millimeters.

Advantages

several types of automation;
decent power;
well assembled;
single-phase mains voltage;
safety valve installed;
There is protection against system overheating.

Flaws

heavy;
rarely found in retail;
no expansion tank.

Heat exchanger type

Modern gas boilers are equipped with cast iron heat exchangers. This is a reliable metal, but very heavy and, in addition, fragile.

Steel is increasingly becoming an analogue of a cast iron heat exchanger. In terms of strength, it is much more reliable, and the level of heat transfer is much higher.

A big disadvantage of steel is its instability to rust: upon contact with water, a steel heat exchanger will quickly become covered with a corrosive coating and collapse. This problem is solved by chrome plating the product - although the cost of the unit increases, its quality improves.

In addition to cast iron and chrome-plated steel, heat exchangers are made from copper or aluminum. Both metals have high strength, good heat dissipation and corrosion resistance. But the cost of the product increases significantly - you can only determine which is better based on your own budget.

Solid fuel models

This is a budget option for heating and domestic hot water: fuel is relatively inexpensive (it’s easy to switch from one to the other if necessary), and the efficiency is high. There are no difficulties with maintenance. The disadvantages include a limited selection of boiler models and the need for physical labor (monitoring the condition of fittings and pipes, removing ash, cleaning spools, loading fuel, forming fuel warehouses).

Solid fuel boiler Kiturami KF-35A 24 kW double-circuit

The quality is top notch.

A Korean boiler that will heat and heat the water, ensuring stable combustion of the fuel. In this case, pyrogenetic waters are removed automatically.

The firebox is spacious, holds up to 40 kg of firewood (and the unit can handle not only dry, but also wet firewood). If your house has an area of up to 100 sq.m. — the boiler will give warmth to every corner of it.

Acceptable fuels are firewood and wood briquettes (the latter are good because they take up less space, emit less soot and burn longer). The boiler has a built-in exhaust fan and room thermostat, and a display for convenience.

Specifications:

85% efficiency;
weighs 250 kg;
dimensions: 780x1150x1300 mm;
chimney: 150 mm.

Advantages

high efficiency;
economical fuel consumption;
you can connect external control;
thermometer;
auto diagnostics;
power indicator;
overheat protection.

Flaws

heavy;
very expensive;
only works on wood.

Solid fuel boiler Burzhuy-K MODERN-12-2K 21 kW double-circuit

A bright assistant for your convenience.

Small in size, up to powerful enough to heat a room of 120 square meters. Control is carried out mechanically.

You can purchase firewood and coal (including briquettes) as fuel. The neutral appearance allows the boiler to fit into almost any design.

The combustion chamber is open. Installation is simple, no skills or special effort required. The same applies to further operation: carefully study the instructions - everything is described in detail there. An automatic combustion control mode is provided.

Specifications:

power: 21 kW;
heated area: 120 sq.m;
coolant threshold: 95 °C;
circuit pressure: 4.5 bar;
weight: 220 kg;
dimensions: 400x1070x780 mm;
chimney: 130 mm.

Advantages

affordable;
does not depend on electricity;
saving on firewood;
powerful;
practical.

Flaws

no display;
there is no circulation pump;
no tank.

Solid fuel boiler Burzhuy-K T-50A-2K 50 kW double-circuit

A machine for a big house.

This boiler can be used with almost any type of fuel: wood briquettes and pure wood, bulk coal and coal plates.

It can be used on both residential and non-residential sites, since it does not require special skills in management and configuration. The design is ergonomic, strong and stable, and remains unchanged much longer than its intended service life.

The material used is corrosion-resistant heat-resistant steel. The walls of the box have a thickness of about 8-10 mm. Installed on the floor. The efficiency rate is 85 percent.

Specifications:

warranty: 24 months;
dimensions: 690x1580x1210 mm;
smoke outlet pipe diameter: 200 mm;
highest moisture pressure in the heating circuit: 4.5 bar;
heated area: 550 sq.m.

Advantages

there is protection against overheating;
safety valve installed;
high-quality assembly;
strong legs;
high power.

Flaws

high price;
bulky;
unattractive appearance.

Solid fuel boiler Burzhuy-K T-75A-2K 75 kW double-circuit

Unpretentious on the outside, but powerful on the inside.

The circulation pump installed in this model costs several times less than its imported counterparts, but works no worse. Effective when working over a large area: even 700 sq.m is not the limit for this boiler.

The control is mechanical, the combustion chamber is installed open. Both the primary and secondary heat exchangers are made of steel.

You can use a lot of components as fuel: wood briquettes, coal in plates or in bulk. The maximum that the coolant can reach is 95 degrees.

Specifications:

power: 75 kilowatt-hour;
load: 82 kW;
weight: 900 kg;
dimensions: 820x1670x1120 mm;
suitable chimney diameter is about 200 mm.

Advantages

there is a measurement of fluid pressure;
thermometer;
fuel economy;
powerful;
stable.

Flaws

crooked seams;
very heavy;
Not everyone will like the appearance.

Electric models

Features and advantages of such models

Electric double-circuit boilers are very convenient in everyday life. It is easy to care for (after all, there is no need to replace filters, control the gas pressure and amount of fuel, etc.), their installation does not need to be discussed with electricity and housing and communal services suppliers. The installed automatic control system programs itself for current conditions, there is practically no risk of explosion or boiling. And you can also save electricity if you think of using a special tariff schedule and a heat accumulator to accumulate kilowatts. But keep this in mind: In some areas, electricity is quite expensive, and power surges over time can eventually break the device.

Electric boiler Galan GALAX G352 15 15 kW double-circuit

Reliable performance and practicality: everything for the customer.

It will give you the level of thermal comfort you desire. Automatic control. Hang the model in any room and don’t worry: the functionality is enough to ensure the safety of you and your loved ones.

The warranty is given for a couple of years, but the actual service life of the unit, judging by customer comments on the Internet, is 2-3 times longer. And there are minimal breakdowns. The boiler weighs very little - only 20 kg. But the volume of the room will be 530-550 cubic meters.

Specifications:

parameters: 450x600x230 mm;
weight: 20 kg;
power: 15 kW;
Mains voltage: three-phase.

Advantages

simple controls;
easy to set up;
affordable price;
safety;
you can connect external devices.

Flaws

no expansion tank;
there is no gas control;
You can't control the remote control.

Electric boiler Savitr Premium Plus 21 21 kW double-circuit

Both beauty and benefit.

This boiler is convenient to use both for maintaining a comfortable temperature in the home and for heating water: all the important and necessary elements for this are present. The WILO circulation pump can last for many years, the CIMM tank is quite large.

The flow sensor opens the one-way valve. The heating elements are reliable because they are made of stainless steel and rotation occurs automatically. Can be controlled using the remote control.

Specifications:

heating area: up to 220 sq.m;
power: 21 kW;
coolant temperature: 5 - 80 °C;
weight: 28 kg;
size: 600x690x225 mm.

Advantages

pressure gauge;
protection against excessively high temperatures;
pressure relief valve;
3 power levels;
good assembly;
programmer

Flaws

massive;
voltage only three-phase;
rarely found on sale.

Electric boiler Savitr Premium Plus 22 22.5 kW double-circuit

High quality domestic product.

This model is capable of heating several large rooms: the total area is 220 square meters - can you imagine the figure?

But the boiler’s power is enough not only for heating, but also to provide hot water for the needs of all residents of the house: a 12-liter CIMM expansion tank and a good circulation pump are quite enough for these tasks.

Heating elements are made of high-strength stainless steel of increased reliability. The safety group includes overheating protection, a pressure gauge, a relief valve, an automatic air vent and a sensor that will signal if the coolant is overheating. Power levels - 3.

Specifications:

maximum thermal power: 22.50 kW;
coolant temperature: 5 - 80 °C;
hot water productivity at 30°C: 10.5 l/min;
maximum water pressure in the heating circuit: 3 bar;
weighs 28 kg;
dimensions: 600x690x225 mm.

Advantages

outdoor temperature sensor;
room air sensor;
external control can be used;
the work start indicator is present;
There is a programmer.

Flaws

no remote control included;
Expensive;
heavy.