Universal devices for heating a private house or apartment are popular. A 2-loop gas boiler is used to heat the room and to obtain hot water supply. For the correct choice of units, you need to consider their characteristics.
Principle of operation
The 2-circuit boiler operates in 2 modes: heating and water heating. However, the device cannot perform these functions at the same time. The first burner activation in heating mode is characterized by a long operating time, since the temperature of the coolant in the circuit must rise to the set values. As soon as the liquid is hot, the fuel supply stops. If there is a temperature sensor in the room, the burner turns on and off automatically.
The movement of the coolant is provided in a natural way (due to the pressure difference) or by a circulation pump. The combustion products are removed through a chimney or with a fan. To turn on water heating, you need to turn the tap on the water tap. The liquid heats up in 5 seconds. In this case, the heating circuit does not work.
In this case, the system is regulated by a three-way valve. This device redirects a certain volume of heated water into the secondary heat exchanger. From it the temperature of the rest of the liquid rises.
Characteristics
- power: from 10 to 280 kW;
- heating area: from 100 sq.m .;
- Efficiency: from 90%;
- type of heat exchanger: aluminum, copper, stainless steel;
- chimney type: natural, coaxial.
Most models of such boilers require an electrical connection.
Types of 2 circuit gas boilers
There are wall-mounted and floor-standing boilers. They differ in the place of installation, as well as in some characteristics.
Wall
The wall-mounted unit is a complete heating system that does not take up much space. It is most often installed in an apartment or in a private house, if the room is small, and it is not possible to equip a separate boiler room. It does not need additional hardware for stable operation. These devices are attractively designed, but they are not resistant to voltage surges.
Floor
The floor-standing version is designed for heating rooms with an area of more than 300 sq. M. In this case, the user himself can choose the heating system depending on his needs. Often, such a unit requires a separate room, but there are small models that are mounted in the kitchen. Such boilers serve for a long time, are autonomous and do not depend on voltage drops in the mains.
Boiler elements
Before using the unit, you need to consider its device. The boiler consists of the following elements:
- Burner. It is located in an open or closed combustion chamber. This part provides heating of the coolant and is a heat generator for hot water supply.
- The combustion chamber.
- Circulation pump. Thanks to him, the coolant moves in the system.
- Three-way valve. Provides switching between water heating and heating modes.
- Main heat exchanger. The location is under the burner.The liquid heats up in it.
- Secondary heat exchanger. Required for preparing hot water.
- Automation. Thanks to her, the parameters of the operation of the heating equipment are regulated. If a malfunction appears in the unit, the automation simply turns it off.
At the bottom of the device there are nozzles for connecting pipes of the heating and water supply system, as well as a device for removing combustion products.
Advantages and disadvantages
The use of double-circuit boilers has the following advantages:
- economical fuel consumption;
- noiselessness;
- the ability to install on the floor or on the wall;
- small dimensions;
- autonomy of functioning;
- Ease of Management;
- safety.
However, there are some disadvantages, for example, significant fluid consumption during the start-up phase. The amount of hot water depends on the volume of the container inside the boiler. For powerful floor models, the construction of an additional foundation or equipment of a separate room is often required.
Selection rules
To choose the right device for a house or apartment, you need to take into account the following parameters:
- total heated area;
- energy costs and maintenance costs;
- availability of additional functions;
- device power;
- type of traction.
When choosing, the material of the heat exchanger is taken into account, since the duration and quality of the device depends on this parameter. Better to give preference to the copper version, but it costs more.
User's manual
Gas boilers are used for heating and hot water supply of apartments, private residential and country houses, public buildings. In this case, it does not matter at all whether the system is connected to the main gas pipeline, since the units can operate on liquefied fuel, which is supplied in cylinders.
The gas equipment manual is a set of requirements and rules, the observance of which makes the operation of the device safe and efficient. Initially, the device is connected to the gas main, as well as to the pipes of the water supply, heating system, and the electrical network. The device is connected to the line only by qualified specialists who have permission to perform such work.
If there is a need to replace parts of the device, only original spare parts are selected. In the event of a malfunction, the unit is immediately disconnected from the gas supply. It is forbidden to carry out any service work to eliminate breakdowns on your own. Before the start of the heating season, the condition of the chimneys and air ducts is checked. When the equipment is turned off for a long time, the gas valve is closed.
Do not use aggressive chemicals to wash the unit. Before turning on the boiler, you need to make sure that there is a coolant in the heating system, that the burner, safety valve and automation are in good working order. During the operation of the unit, it is necessary to ensure that there is no smell of gas in the room. The burner is periodically cleaned from dirt.
Popular manufacturers
When choosing heating equipment, not only its characteristics are taken into account, but also the manufacturer. It is better to choose the equipment of those companies that have good reviews and an impeccable reputation.
Ariston
Ariston double-circuit gas boilers are made in Italy. The company offers a wide range of equipment characterized by modern automation and functionality. This technique has the following advantages:
- low power consumption;
- ecological cleanliness, safety;
- the main heat exchanger is made of copper;
- compactness;
- the ability to adjust the strength of the flame;
- automatic ignition;
- multilevel protection system.
Among the disadvantages is the need for periodic manual adjustment of the boiler. In addition, it makes noise during operation.
Buderus
The manufacturer offers wall-mounted models of double-circuit boilers, which are adapted to domestic operating conditions: pressure drops. The equipment runs on natural and liquefied gas. The heating system quickly adjusts to optimal functioning, the boiler has thermal and sound insulation, reliable automation. The devices stand out for their modern design and reasonable cost. However, the units are not protected against voltage surges.
Hephaestus and others
Domestic manufacturer with high reliability. The automatics on the units are Italian, they function without failures. The devices are simple in design, so operation is intuitive. The risk of breakdowns is reduced to zero, since there are a minimum of auxiliary units in the device. Hephaestus boilers are easy to maintain. Users can choose from floor-standing or wall-mounted options.
Among other manufacturers, the following are popular:
- Vailant. German company offering wall and floor models, turbocharged and atmospheric type. The power of the devices ranges from 4 to 280 kW. The equipment is high-tech. The advantage of the unit is self-diagnostics. Efficiency - from 92%. The boilers have an ergonomic design. Maintenance of these devices is expensive.
- Baxi. The Italian company offers devices that are protected from pressure drops, freezing of the coolant, breakage of a 3-way valve. The equipment is adjusted manually and automatically. Operation and installation are simple, the automation reacts to weather changes.
Gas double-circuit boilers are the best devices for heating houses or apartments of any area, with an additional function of heating water. Correct installation and observance of operating rules will increase their service life.
