For heating private, country houses, cottages, different types of boilers can be used: gas, electric, solid fuel, diesel, waste oil. However, the most widespread devices are those that run on natural gas. They are more economical and can operate fully automatically.
And among all the options, the most popular is the double-circuit wall-mounted gas boiler with a closed combustion chamber. Similar models are presented in a wide range: from different manufacturers, at a variety of prices and technical characteristics. This creates certain difficulties for buyers, but allows them to choose the best option according to all the necessary parameters.
Rating of the TOP 15 best double-circuit gas boilers of 2020-2021
| Place | Name | Price |
| TOP 3 best double-circuit gas boilers by price, quality and reliability | ||
| 1 | BAXI ECO-4s 24F 24 kW | Find out the price |
| 2 | Buderus Logamax U072-12K 12 kW | Find out the price |
| 3 | Bosch Gaz 6000 W WBN 6000-18 C 18 kW | Find out the price |
| TOP 3 best wall-mounted double-circuit gas boilers | ||
| 1 | Lemax PRIME-V32 32 kW | Find out the price |
| 2 | Vaillant turboTEC pro VUW 242/5-3 24 kW | Find out the price |
| 3 | Protherm Panther 25 KTV (2015) 25 kW | Find out the price |
| TOP 3 best floor-standing double-circuit gas boilers | ||
| 1 | Lemax Premium-30B 30 kW | Find out the price |
| 2 | Protherm Bear 30 KLZ 26 kW | Find out the price |
| 3 | Lemax Premium-20B 20 kW | Find out the price |
| TOP 3 best energy-independent double-circuit gas boilers | ||
| 1 | Lemax Premium-12.5B 12.5 kW | Find out the price |
| 2 | Lemax Premium-25B 25 kW | Find out the price |
| 3 | Lemax Premium-16B 16 kW | Find out the price |
| TOP 3 best condensing double-circuit gas boilers | ||
| 1 | BAXI Duo-tec Compact 24 20 kV | Find out the price |
| 2 | Protherm Lynx18/25 MKV 18 kW | Find out the price |
| 3 | BAXI NUVOLA Duo-tec+ 16 12 kW | Find out the price |
Combustion chamber type
The gas burner is located in the combustion chamber. There are two types - open (atmospheric) and closed (with a turbine, forced). A double-circuit gas boiler with an open combustion chamber can only be installed in rooms with good ventilation. During operation, the oxygen necessary for combustion is taken from the room, and combustion products are discharged into the chimney with good draft. Therefore, a good air flow and a properly functioning exhaust ventilation duct are necessary.
Gas boilers come with open and closed combustion chambers
Gas boilers with a closed combustion chamber are distinguished by the fact that at the chamber outlet there is a coaxial chimney (pipe within a pipe) equipped with a fan. The chimney is taken out into the street, or into the wall near the boiler. Through one pipe, air is taken in from the street, through the second, combustion products are removed, their movement is ensured by a fan-turbine.
Which combustion chamber is better? A boiler with a closed combustion chamber operates more stably - air enters directly into the combustion zone. But there is also a disadvantage to this: with a side wind, the air flow can be so strong that it blows out the burner and the boiler turns off. The second disadvantage of this solution is freezing and the formation of ice in winter. Well, the third drawback is that such a boiler only works when there is electricity - without a turbine it turns off. Well, there is another small minus - the turbine is not silent. It’s almost inaudible, but it’s “almost.” Apparently for these reasons, if possible (a working ventilation duct), boilers with an open combustion chamber are installed. After all, ensuring a constant flow of air is much easier.
How to choose and what to pay attention to?
- Control method : single stage. two-stage or three-stage. Two-stage boilers adapt best to daily and seasonal temperature changes.
- Heat exchanger type : separate or bithermic devices. Separate ones have 2 heat exchangers: one for heating, the second for hot water supply. In such boilers, scale does not form and boiling of water is eliminated, but they are more expensive. Bithermic ones have double elements, the disadvantages are worse cross-country ability and scale formation.
- Automation : mechanical or electronic. Electronic ones are more expensive, but in case of problems with electronics, additional repair costs are required.
AB Electrolux
The Swedish concern AB Electrolux sells 18 models of double-circuit gas boilers on the Russian market. The range includes floor-standing models with built-in boilers and expansion tanks, wall-mounted models with bithermal and separate heat exchangers. Burners with gas supply modulation and automatic equipment performance monitoring systems are used everywhere. Service support in the Russian Federation is provided by more than 300 authorized centers. Some models of AB Electrolux gas boilers
| Model | Power / heated area, kW/m² | Open water intake points, pcs. | Average / nominal gas consumption, m³/hour | Boiler features | price, rub. |
| GCB 11 Basic X Fi | 11 / 80 | 1 | 0.58 / 1.24 | Automatic monitoring of sensors and systems, connection of a remote control unit, prevention of the development of bacteria in the DHW circuit. | 32 400 |
| Basic Space 24Fi | 23.9 / 160 | 2 | 0.65 / 2.7 | 30 690 | |
| FSB 40Mi/HW | 36.8 / 250 | 2 | / 4.3 | 134 000 |
Watch AB Electrolux video:
The best double-circuit gas boilers in terms of price, quality and reliability
BAXI ECO-4s 24F 24 kW
A mid-priced convection boiler that can be installed in any room: bedroom or kitchen.
Works on both natural and liquefied gas. A closed combustion chamber allows you to spend less gas on heating, while the heating output remains high.
The primary heat exchanger is made of copper, the secondary one is made of stainless steel. There is a built-in circulation pump and expansion tank.
The display is installed on the case, there is also a thermometer, pressure gauge, and power-on indication. It is allowed to connect a separate chimney (with a diameter of no more than 80 mm) .
An air vent, safety valve and gas control are installed as protection.
The water is purified using an internal filter . Weighs 30 kg. Service life - 10 years, warranty period - 2 years. This model has proven itself well in 2021.
Specifications:
- Thermal power: 9.30 - 24 kW;
- Thermal load: 10.60 - 25.80 kW;
- Dimensions: 400x730x299 mm.
pros
- pump blocking protection;
- connection of a warm floor,
- flame modulation;
- auto diagnostics;
- frost protection;
- heats liquid quickly;
- silent;
- reliable components.
Minuses
- You cannot adjust the power yourself.
Buderus Logamax U072-12K 12 kW
This model has received many positive customer reviews: users describe it as a reliable and convenient wall-mounted unit with a high level of safety and almost silent.
Changes in electricity and pressure do not affect its performance in any way. The power is enough to heat an area of up to 350 sq.m.
The kit includes: pump, expansion tank, flow sensor, safety valve and control and safety device.
The size of the boiler allows it to be placed even in a small room: for example, a pantry or bathroom.
Index “K” means that water can be heated without the use of additional equipment.
An additional layer of thermal insulation on the walls of the unit will prevent it from overheating.
Intuitive control: LCD display with indication of operating parameters, 5 buttons and temperature controls. Weight - 29 kg. The warranty period is 24 months. The model is current for 2021.
Specifications:
- Thermal power: 5.40 - 12 kW;
- Dimensions: 400x700x299 mm;
- Efficiency: 92%.
pros
- easy to install and operate;
- noise level: <36 dBA;
- holds the temperature without any complaints;
- can also operate on liquefied gas;
- heat exchanger service life: 15 years;
- functions of gas control, auto-ignition and overheating protection.
Minuses
- malfunctions in the heating system were noted.
Bosch Gaz 6000 W WBN 6000-18 C 18 kW
This model is designed specifically for Russian conditions, which means that the boiler is resistant to pressure changes (9-17 mbar) and network voltage (165-240 V), and is completely protected from freezing.
Easily and quickly heats an area of 180 sq.m. The water is heated in a plate heat exchanger, and little fuel is spent on its operation.
The main heat exchanger is made of high quality copper without impurities. There is a modulated fan and a gas valve seal sensor.
Circulation pump - built-in, three-stage.
The flame control electrode is ionization.
The heat exchanger is protected from overheating by an installed temperature limiter.
Display - LCD, with indication of operating parameters. The warranty period is 730 days. Weighs only 28 kg.
Specifications:
- Heating system power: 5.40 - 18 kW;
- Thermal load: 6 - 20 kW;
- Dimensions: 400x700x299 mm.
pros
- easy to use;
- it is easy to install;
- does not make noise during the process;
- high performance;
- you can connect external regulators (ON/OFF, Open-Therm);
- auto ignition;
- pump blocking protection;
- high-quality assembly.
Minuses
- The first launch is long.
FERROLI SPA
The Italian industrial group FERROLI SPA offers Russians an impressive range of gas boilers (15 options only in the basic Diva series). The catalogs include models of budget and premium classes. Each product is equipped with automatic burners with continuously adjustable gas supply. Circulation pumps and an expansion tank ensure stable operation of both circuits. It is possible to control the boiler from a local, remote control or room programmer. The manufacturer claims a 1 year warranty. Some models of FERROLI SPA gas boilers
| Model | Power / heated area, kW/m² | Open water intake points, pcs. | Gas consumption, m³/hour | Boiler features | price, rub. |
| Domina C 16 N | 16 / 100 | 1 | 1.86 | Anti-blocking of the pump and three-way valve, bypass, flame modulation, copper heat exchanger for the heating system, steel for domestic hot water. | 26 917 |
| Arena C 24 | 24 / 160 | 1-2 | 2.73 | 27 410 | |
| Divatop Micro F 37 | 39.7 / 260 | 2-3 | 4.2 | 52 828 |
Watch the FERROLI SPA video:
The best wall-mounted double-circuit gas boilers
Lemax PRIME-V32 32 kW
Compact boiler in a stylish white box and made from European components (Valmex, POLIDORO, SIT, NordGas, Bitron).
The top lining is easily removed. You can connect a room thermostat to it to adjust the temperature inside the house as accurately as possible.
You can heat it with natural gas, or you can switch to liquefied gas without any problems.
LCD display, intuitive operation.
Adapted to gas changes. Combustion products are removed through a chimney (separate or coaxial - at the user’s request).
The unification of units and components is high, the thermal insulation is continuous, thanks to which residents will be as comfortable as possible near the unit.
It works stably even in the event of a sharp decrease or increase in voltage (185 - 245 v).
Specifications:
- Power parameters: 6 - 18 kW;
- Efficiency: 92.5%;
- Warranty period: 2 years;
- WxHxD: 430x770x268 mm.
pros
- there is a remote control function using Android and IOS;
- double level of protection against pressure in the circuit;
- sensors and sensors are protected from corrosion and scale;
- does not buzz or rumble during operation;
- sufficient power level;
- reasonable price.
Minuses
- no protection against pump blocking;
- volatile
Vaillant turboTEC pro VUW 242/5-3 24 kW
German quality standards and high-tech equipment - all this is reflected in the described wall-mounted boiler.
Its cost is high, but the functionality is excellent: electronic ignition; built-in switching module for eBus interface; switch winter-summer; possibility of manual configuration; “smart” pressure control in the system.
The user can configure the unit manually, or can trust the well-coordinated automation, which will find faults, if anything happens, and calculate all the parameters.
The burner is made of high-strength chromium-nickel steel, heat-resistant and heat-resistant.
The heat exchanger is plate-type, flow-through. The display is liquid crystal, has a backlight and convenient buttons. Weighs 40 kg. The warranty is given for 900 days, the service life is 10 years.
Specifications:
- Boiler power: 24 kW;
- Load: 9.40 - 26.70 kW;
- Parameters: 440x800x338 mm.
pros
- protection against freezing, pump jamming and fan problems;
- powerful;
- high-quality assembly;
- you can connect a separate chimney;
- flame modulation.
Minuses
- price (about 100 thousand rubles);
- expensive components;
- the pump is noisy.
- problems with post-warranty service in the regions.
Protherm Panther 25 KTV (2015) 25 kW
You can’t call it cheap, but it’s easy to call it high quality . The heat exchanger is made of copper (without
there are no foreign impurities), the combustion chamber is closed.
There is gas control, a safety valve, protection against freezing and overheating of the unit.
If the installation is left idle for a long time, the pump will turn on and off on its own to avoid blocking.
Convenient electronic control and autonomous operation distinguish this unit from competitors in the same price niche.
A pressure gauge is installed to monitor the coolant pressure.
It is possible to connect additional elements: room remote controls, programmers, thermostats.
The electronic system significantly saves fuel and does not require the constant presence of a person nearby.
Flame modulation reduces fuel consumption (both natural and liquefied gas). The warranty is valid for 730 days.
Specifications:
- Power: 8.40 - 25 kW;
- Thermal load: 9.40 - 27.10 kW;
- Weight: 41 kg;
- Dimensions: 440x800x338 mm.
pros
- connection of external control;
- auto diagnostics;
- all necessary types of protection are installed;
- long warranty period.
Minuses
- Efficiency is average;
- It is impossible to connect a heated floor.
Equipment traction options
During operation of the unit, fuel burns and flue gases are generated. To remove them from a living space, natural or forced draft is necessary. It will ensure timely removal of all combustion products and released harmful substances from the apartment or house.
Natural draft modules
Boilers operating on natural draft have a simple design and take the air necessary for proper combustion from the room in which they are located. During intensive use, a certain amount of steam and various chemicals are released. Emissions are removed through a vertical chimney.
Among the main advantages of units with natural draft are reasonable cost, energy independence and absence of noise effects during operation.
In general, devices with natural draft are convenient and good, however, when the pressure in the gas pipeline drops, the quality of their work decreases significantly. At the same time, the risk of rapid burnout of the burner increases, since the fire at a reduced pressure level dies out or goes inside the burner device.
Uneven pressure in the main networks provokes serious overconsumption of fuel, which entails an increase in the amount of utility bills.
Forced draft devices
Boilers with forced draft are sometimes called forced-air or fan-type. They take air not from the room where they are located, but from the street. The modules have closed combustion chambers, and waste substances are emitted through a coaxial horizontal outlet using a powerful fan built into the system.
A coaxial bend consists of two pipe elements of different diameters inserted into one another. Through the smaller pipe, combustion products exit the room, and through the space between the small and large pipes, fresh air enters the room from the street, which is necessary for the full functioning of the boiler
Products with forced draft are easy to install, do not make any demands on the location, do not “eat up” oxygen in residential premises, work stably and accurately even with reduced gas pressure in the central main networks and do not require the installation of an additional vertical chimney.
The devices are criticized for the noisy operation of fan elements, higher cost and dependence on power supply.
The best floor-standing double-circuit gas boilers
Lemax Premium-30B 30 kW
If you need an inexpensive but powerful boiler, pay attention to this model . This
a non-volatile unit, which has both gas control and protection against abnormally high temperatures. The model is compact and takes up little space.
Its power is enough to create a comfortable, warm environment in a house with an area of up to 300 sq.m., and that’s quite a lot!
Permitted fuel is natural gas . The primary heat exchanger is made of improved steel, the combustion chamber is open, and the assembly is of high quality.
Natural gas consumption - 3.5 cubic meters. m/hour . Weight - 88 kg. Efficiency - 90%. The maximum coolant temperature is 90 °C. Natural gas consumption - 3.5 cubic meters. m/hour.
Specifications:
- Dimensions (WxHxD): 556x961x470 mm;
- Chimney diameter: 130 mm;
- Warranty - 36 months.
pros
- affordable;
- there is a convenient thermometer;
- gas control function;
- powerful;
- reliable.
Minuses
- mechanical control only;
- It is prohibited to use liquefied gas.
Protherm Bear 30 KLZ 26 kW
Automatic boiler with two circuits. It will not only heat your home, but also heat
water for household needs.
The volume of the storage boiler is 90 liters, the heat exchanger is made of cast iron, which means that it is not afraid of corrosion, acids and aggressive external environments, it will withstand high temperatures and will serve you faithfully for at least 40 years.
4 sections, 2-way heat exchanger . The weight of the unit is 155 kg. Coolant temperature - 45 - 85 °C.
Electric ignition is smooth, it is possible to install an additional fan to remove flue gases.
Manufacturer's warranty - 2 years. In case of abnormal temperatures it automatically turns off. There is pump blocking protection.
Specifications:
- Dimensions (WxHxD): 505x1385x730 mm;
- Thermal power - 18.20 - 26 kW;
- Thermal load - 20 - 28.50 kW.
pros
- you can use liquefied gas as fuel;
- electronic control;
- there is a built-in boiler;
- “smart” diagnostics;
- flame modulation"
- frost protection.
Minuses
- very heavy;
- no power-on indication;
- You cannot install a separate chimney.
Lemax Premium-20B 20 kW
A domestic development, which in terms of its mechanics is absolutely not inferior to foreign units.
It corresponds to the declared power, has good efficiency (90%), is made of inexpensive, but high-quality and durable steel.
The necessary functionality is installed: gas control, protection against excessive heating of the housing.
A non-volatile model that is not afraid of power surges and power outages.
The combustion chamber is open. Heated area - up to 200 sq.m. Gas connection pipe - 1/2″.
Max. water pressure in the heating circuit is 3 bar, in the DHW circuit - 6 bar . The permissible coolant temperature is 90 °C.
Specifications:
- Maximum thermal power: 20 kW;
- Dimensions: 556x961x470 mm;
- Warranty period: 36 months;
- Boiler weight: 83 kg.
pros
- affordable;
- non-volatile;
- compact dimensions;
- great guarantee.
Minuses
- cannot be connected to underfloor heating.
LLC "Plant Conord"
Relying on 30 years of production experience, Conord Plant LLC relied on the simplicity and reliability of the design. The range of double-circuit gas boilers includes 11 basic models. Russian and Italian components are used in production. Brand warranty up to 3 years and a stated 15-year service life. More than 100 authorized service centers. Some models of gas boilers LLC "Plant Conord"
| Model | Power / heated area, kW/m² | Open water intake points, pcs. | Average / nominal gas consumption, m³/hour | Boiler features | price, rub. |
| KSts-GV-12N | 12 / 80 | 1 | 0.7 / 1.35 | Electrical independence, floor installation, convection heat extraction circuit, simple control. | 20 900 |
| KSts-GV-20N | 20 / 140 | 1 | 1.2 / 2.43 | 25 500 | |
| KSts-GV-30N | 30 / 200 | 2 | 1.8 / 3.69 | 29 000 |
Watch a video about gas boilers of Conord Plant LLC:
The best non-volatile double-circuit gas boilers
Lemax Premium-12.5B 12.5 kW
Trouble-free boilers with good automation and at an affordable price . Warms up well
a room with an area of more than 100 square meters.
The connection pipe for the circuit is convenient, heats the water well and quickly. The efficiency is almost 100%.
It works by burning gas, specifically methane . Ignites manually. The steel coolant is not afraid of deformation and impacts; it will last from 5 to 20 years.
Thanks to manual control, it is possible to save fuel . The control panel is reliable.
Install a thermometer to monitor the temperature in the boiler. There is overheat protection.
Specifications:
- Maximum thermal power: 12.50 kW;
- Max. coolant temperature: 90 °C;
- Natural gas consumption: 1.5 cubic meters m/hour.
pros
- independent from the electrical network;
- inexpensive;
- quickly heats the liquid;
- there is protection against overheating;
- there is gas control;
- thermometer.
Minuses
- uneconomical;
- large heat losses;
- there is no protection against pump blocking and flame modulation.
Lemax Premium-25B 25 kW
A fairly massive and large-sized boiler running on natural gas.
Capable of dispensing approximately 7 liters of boiling water in 1 minute.
There is no connection to the network, ignition is done manually, the coolant works without a pump.
Material: steel.
It is durable, cheap and light in weight . You can set the basic parameters yourself.
If the water reaches high values, the boiler automatically turns off.
There is a function to turn off the gas in case of flame extinguishment. Efficiency - 90%, weight - 88 kg. Gas consumption is low. The heated area is large - 250 sq.m.
Specifications:
- Boiler dimensions: 556x961x470 mm;
- Warranty period: 36 months;
- Natural gas consumption: 3 cubic meters m/hour.
pros
- easy to operate;
- reasonable cost;
- reliable.
Minuses
- There are no weather electronics.
Lemax Premium-16B 16 kW
An inexpensive option, optimal in its characteristics, suitable for both an apartment and a country house with an area of 160 sq.m..
It does not depend on the power supply; overheat protection will disconnect the device from the network when the maximum allowed temperature is exceeded.
A sensitive sensor is installed to prevent gas leakage.
It is necessary to install the unit, observing the required distances from the walls. Open combustion chamber, efficiency - 90%.
The warranty period is set at 36 months . Fuel - methane. The boiler produces 5 liters of hot water per minute. Mechanical control.
Specifications:
- Parameters: 416x744x491 mm;
- Weight - 60 kg;
- Chimney diameter is 130 mm.
pros
- heats the room well;
- inexpensive in price;
- qualitative;
- practical;
- there is protection against flame extinction.
Minuses
- it is prohibited to use liquefied gas in this model;
- There is no room thermostat and pressure gauge.
Advantages and disadvantages of gas systems
In places where central gas communications are laid, double-circuit boilers are very popular. They are purchased for heating and uninterrupted supply of hot water to apartments, residential buildings and country cottages.
The main advantages of the devices
The gas system demonstrates a high level of efficiency, delivers several times more energy than it consumes, lasts a long time and operates smoothly. Does not require constant human supervision.
The double-circuit boiler looks neat and modern. Unlike units operating on solid or liquid fuels, during operation it practically does not emit unpleasant odors and creates a minimum of soot and soot
The fuel resource is supplied to the installation continuously, and the built-in controller independently monitors the presence of fire on the burner. If the flame dies out, the sensor sends a signal to the ignition unit and the automatic supply of a spark instantly restores the fire. Controlling the boiler is simple and does not present any difficulty.
Disadvantages of dual-circuit equipment
The main disadvantages are associated not so much with the device itself, but with the process of its legalization and installation. You can’t just buy a boiler, bring it home and install it yourself according to the connection diagram. First, you will have to comply with a lot of technical nuances, draw up documentation and coordinate all subsequent actions with the local gas supply company.
There you will need to provide:
- equipment installation project, drawn up in accordance with the norms adopted by law;
- installation agreement with a specialized organization;
- a copy of the license of the specialized organization confirming the right to carry out work.
In addition, you will need to organize the removal of exhaust gas from the living space, lay an additional chimney for this or use an existing old one, and install additional equipment to control potential gas leaks.
If the boiler smokes, perhaps the pressure in the system has decreased or the existing burner has worn out and begun to burn out. A specialist with relevant experience will help you quickly fix problems
The main installation activities can begin only when the project documentation for the organization of gas heating has passed all stages of approval and the client receives a stamped permit for the installation of the system.
The best condensing double-circuit gas boilers
BAXI Duo-tec Compact 24 20 kV
The developers of the Duo-tec Compact series have successfully combined advanced technologies, ease of installation, and ease of operation in one model.
This is one of the best adaptive models, equipped with a super-modern burner (which is capable of pre-mixing air with gas), a very convenient control panel and a bunch of devices and functions (auto-ignition, pressure gauge, thermometer, etc.).
The specified service life is 10 years, which means that for a very long time you will not have to worry about the heating system of your home area.
Weighs 34 kg, compact and stylish in appearance model with internal filtration of incoming liquid, installed air vent and safety valve.
Specifications:
- Warranty: 2 years;
- Parameters: 400x700x299 mm;
- Power: 3.40 - 20 kW;
- Load: 3.50 - 20.60 kW.
pros
- external control can be connected;
- auto ignition;
- flame adjustment;
- pump blocking protection;
- Efficiency is above one hundred.
Minuses
- energy dependent;
- no built-in boiler.
Protherm Lynx18/25 MKV 18 kW
This boiler has almost all the necessary functionality: a convenient closed combustion chamber, an air vent, a safety valve.
Thanks to its small size and wall installation, the boiler takes up little space and saves space.
Thanks to the auto-diagnosis function, the user will find out what kind of malfunction has occurred (you just need to look at the table with codes), and flame control will not allow gas to escape into the room if the flame suddenly goes out.
The primary heat exchanger is made of aluminum (which is why it weighs so little).
The control panel is electronic . The efficiency percentage is high (more than 100). On the front of the case there is a backlit display and a thermometer.
The circulation pump and expansion tank are built-in.
The warranty period is 2 years.
Specifications:
- Power parameters: 5 - 18 kW;
- Thermal load: 5.10 - 18.40 kW;
- Dimensions: 390x700x280 mm.
pros
- connection of external control is allowed;
- auto ignition;
- the boiler is protected from freezing and excessively high temperatures;
- blocking protection is installed;
- flame modulation allows you to save fuel.
Minuses
- liquefied gas as a fuel is prohibited;
- energy dependent.
BAXI NUVOLA Duo-tec+ 16 12 kW
If you need a lot of hot water, this model is ideal . Burner from
stainless steel - a new generation, allows you to pre-mix fuel with air.
The combustion system is adaptive. If the pressure drops (even to a level of 5 mbar), the rated power will be maintained.
The hot water output in the first 30 minutes is more than two hundred liters . Pump post-circulation, automatic bypass, filter installed at the cold water inlet.
The control panel is convenient, with a wide display.
The temperature can be regulated either by a person or automatically: you just need to set the necessary parameters. Fire control is ionization.
Specifications:
- Boiler power: 2.20 - 12 kW;
- Load: 2.30 - 12.40 kW;
- Warranty: 24 months.
pros
- excellent efficiency level: 105.8%;
- weather-compensated automation;
- digital indication of pressure and temperature;
- When the pressure drops, the electronic pressure gauge is activated.
Minuses
- no room thermostat;
- Expensive.
Classification by installation location
According to the installation principle, boilers serving two communication circuits are floor-mounted, wall-mounted and parapet-mounted. Each option has its own special characteristics.
Based on them, the client can choose the most suitable installation method for himself, in which the equipment will be conveniently located, will not “eat up” the usable area and will not cause problems during operation.
Floor-standing boilers
Floor-standing units are high-power devices that can heat and provide hot water not only to a standard apartment or residential building, but also to a large industrial premises, public building or structure.
If a double-circuit boiler is planned to be used not only for heating and supplying domestic hot water, but also for replenishing warm water floors, the basic unit is equipped with an additional circuit
Due to their large size and significant weight (up to 100 kg for some models), floor-standing gas boilers are not installed in the kitchen, but are placed in a separate room directly on the foundation or on the floor.
Features of wall equipment
A mounted appliance is a progressive type of household heating equipment. Due to its compact size, a geyser can be installed in the kitchen or other small rooms. It can be combined with any type of interior solution and fits organically into the overall design.
A double-circuit wall-hung boiler can be placed not only in the kitchen, but also in the pantry. It will take up minimal space and will not interfere with furniture or other household appliances
Despite its small size, a wall-mounted boiler has the same functionality as a floor-standing device, but has less power. It consists of a burner, an expansion tank, a pump for forced movement of the coolant, a pressure gauge and automatic sensors that make it possible to use the fuel resource with maximum efficiency.
All communication elements are “hidden” under a beautiful, modern case and do not spoil the appearance of the product.
The flow of gas to the burner is controlled by a built-in safety system. In the event of an unexpected interruption of the resource supply, the unit’s functioning completely stops. When fuel starts flowing again, the automation automatically activates the equipment and the boiler continues to operate in standard mode.
The automatic control unit allows you to set the device any operating parameters that are most suitable for the user. It is possible to set your own temperature conditions for different times of the day, thus ensuring economical consumption of fuel resources.
Nuances of parapet devices
A parapet boiler is a cross between a floor-mounted and a wall-mounted unit. It has a closed combustion chamber and does not create harmful emissions. Does not require the installation of an additional chimney. The combustion products are removed through a coaxial chimney laid in the outer wall.
A parapet-type boiler is the best option for heating equipment for small rooms with a weak ventilation system. The device is designed so that during operation it does not emit combustion products into the atmosphere of the room in which it is installed.
The device is mainly used to provide hot water and full heating to small houses and apartments in high-rise buildings where it is not possible to install a classic vertical chimney. The basic power ranges from 7 to 15 kW, but despite such low figures, the unit successfully copes with the assigned tasks.
The main advantage of parapet equipment is the ability to connect heating and water supply communications to the central gas system and pipelines from any side convenient for the user.
Types of double-circuit gas boilers
- Condensing boiler - generates heat not only due to the fact that gas is burned inside, but also due to the effect of condensation of water vapor (it is formed as one of the combustion products). This is durable equipment with high efficiency.
- Non-volatile boiler - works in difficult conditions without electricity. Such devices last a long time, are easy to operate and save energy.
- Wall-mounted boilers require mounting on the wall, with a mandatory indentation from other equipment and furniture. They combine both a heating boiler and a water heater. Suitable for small houses (350-400 sq.m. area).
- A convection boiler differs from a condensing boiler in only one way - the more complex principle of heat accumulation.
BAXI SpA
The Italian company BAXI SpA has been known since 1993. The official service in Russia became available in 2002, after the opening of its own representative office. The entire range of convection and condensing boilers is characterized by high performance. The hydraulic group of the DHW circuit is made of composite materials. Each configuration includes a room thermostat. The NUVOLA-3 line is equipped with a removable control panel. The maximum warranty from the manufacturer is 30 months. Some models of gas boilers BAXI SpA
| Model | Power / heated area, kW/m² | Open water intake points, pcs. | Gas consumption, m³/hour | Boiler features | price, rub. |
| ECO-4s 10F | 10 / 70 | 1 | 1.19 | Self-diagnosis, modulating burner, support for “warm floor” mode, high performance of the DHW circuit. | 25 435 |
| FOURTECH 24F | 24 / 160 | 2 | 2.78 | 33 289 | |
| NUVOLA-3 Comfort 320 Fi | 32 / 220 | 2 | 3.65 | 77 471 |
Watch BAXI SpA video:
How to choose the power of a gas boiler
Do not strive to buy a boiler with the highest power . Based on the number of boiling water collection points in your home: the more there are, the more power you need.
About a third (30-40%) is spent on heating, add to these data another 10-20% of inevitable heat losses.
The remainder should be enough to heat your house or apartment . Example: for a house with an area of 200 sq.m. and with one bathroom, a boiler with a power of 24 kW is sufficient.
Insulating your home will help avoid significant heat loss and save fuel.
Operating principle of double-circuit boilers
In heating mode, the unit operates as follows: after the first switching on, the burner “warms up” for a long time, and having reached the required numbers, gas stops flowing into the boiler.
The coolant drives heat back and forth through the coolant, combustion products are removed from the system (either by a fan or independently).
In the heating mode of the water circuit, its operation begins with the turn of the tap. The three-way valve stops the heating circuit, the gas burner lights up (if it was turned off) and hot water starts flowing from the tap.
Criterias of choice
A wall-mounted double-circuit gas boiler should be assessed according to the following main characteristics:
By power.
This parameter is decisive, since the efficiency of the heating circuit depends on it. To determine the required installation power, consider:
- Size of heated area;
- Glazing features;
- Availability of thermal insulation;
- Height of ceilings;
- Number of external walls.
By type and number of heat exchangers
. Designs with separate heat exchangers for hot water supply and heating mains have the following advantages:
- When using a secondary heat exchanger, the possibility of burns is practically eliminated, since the temperature in the DHW line does not rise above 60 0C;
- The amount of scale and mineral deposits in the secondary heat exchanger is minimal;
- If scale forms in the primary heat exchanger, you can clean or replace it yourself.
The disadvantages of this design include:
- Higher cost compared to bithermal heat exchangers;
- The need to install a three-way valve.
Using a twin heat exchanger allows you to:
- Significantly reduce the overall dimensions of the boiler and eliminate the installation of a three-way valve and simplify the design;
- The cost of a bithermal heat exchanger is less than the total cost of the primary and secondary heat exchangers.
This is where all the advantages of such a scheme end, but the disadvantages of this design are very significant:
- Regardless of the selected operating mode, stagnation of the heated liquid is observed either in the heating circuit or in the DHW circuit, which leads to intensive formation of mineral deposits in the heat exchanger tubes;
- When the DHW tap is closed, intense heating of the water continues, so when the mixer is opened, you can get a serious burn. Regulating the water temperature using an automated control system leads to a decrease in the efficiency of the heating main;
- The universal heat exchanger is a rather complex structure and, if the tubes become clogged or leaks, cannot be repaired or cleaned.
Based on the above, we can conclude that despite the higher cost, preference should be given to units with a secondary heat exchanger for the DHW circuit.
By type of combustion product exhaust system
There are installations with natural and forced removal of exhaust gases. Natural removal of combustion products has the following advantages:
- There is no need to install an exhaust fan;
- With a properly installed chimney, condensation does not form;
- The cost of installations with natural exhaust is noticeably lower than the cost of boilers with forced removal of combustion products;
- The simplicity of the design significantly increases the reliability of the unit.
However, this design is not without its disadvantages:
- The need to install supply ventilation ducts;
- Objective difficulties with the design and construction of a chimney;
- In a city apartment, installation of a chimney is not possible.
Forced removal of combustion products is carried out using a built-in fan. The advantages of turbocharged boilers include the following:
- Such equipment can be installed both in the private sector and in an apartment;
- There is no need for a supply ventilation device;
- Despite the fact that the price of turbocharged units is slightly higher than chimney units, the difference is fully compensated by the absence of costs for the design and installation of a chimney.
Flaws:
- Excessive formation of condensate in the coaxial pipe. If the temperature drops significantly, the chimney may freeze;
- The design of the device is greatly complicated due to the installation of a pneumatic relay, a fan and a fan relay;
- The operation of the fan increases the noise of the boiler.
By automation, energy dependence and type of ignition
double-circuit wall-mounted gas boilers can differ significantly. Budget class models are equipped with an electronic control unit providing:
- Switching off the device if there is insufficient traction;
- Protective functions of the system in case of burner extinguishing;
- Blocking the operation of the boiler in the absence of coolant in the heating line.
In premium models, the electronic control unit can provide a number of additional functions:
- Possibility of programming in heating and heated floor modes;
- Automatic start of the installation if the coolant temperature drops to +5 0C;
- Storing programs for various operating modes.
Single-circuit boiler or double-circuit boiler - which is better to choose for your home: expert advice
In addition, the design of modern models allows them to fit organically into any interior.
