Heating equipment in the modern market is represented by a huge number of models. Of these, the most common are gas-powered units. This fact is explained quite simply: the described fuel is one of the available energy products, with the help of it systems operate in stand-alone mode. The principle of operation and the advantages of double-circuit floor boilers are known not only to specialists, but also to many owners of private real estate.
If you also decided to equip the heating system in your house, then you should know how the wall-mounted double-circuit unit with an open combustion chamber differs from the floor version, in which the chamber is closed. It will also be useful to know where the dual-circuit systems are used, as well as what their structure and principle of operation are. Models of gas boilers can be classified into single-circuit and double-circuit.
The former have a coil, which provides only the possibility of heating in the house. Double-circuit boilers have two coils or circuits, one of them is intended for heating, while the other is for water, which is usually used for sanitary purposes.
Operating principle
Double-circuit floor boilers from different manufacturers have a certain design, but they have one common solution - two circuits are located inside. The one responsible for heating operates in a closed circuit. The water there moves in a circle, bypassing the batteries in the premises of the house. The heated liquid, which moves in a closed circuit, does not enter the secondary circuit. A separate valve is used for this. When the tap for water consumption opens in the taps in the bathroom or kitchen, the valve closes the coolant into the heating system, which ensures the supply of hot water to the water supply circuit. When the taps are closed, everything happens in the reverse way.
Almost all double-circuit floor boilers have similar technical nodes, and models from different suppliers differ in some details. Considering the assembly diagrams, you can see that the devices have three blocks, among them it should be distinguished:
- Automation
- burner;
- heat exchanger.
As for automation, she is responsible for managing the installation.
Features of the device of condensation and convection boilers
A double-circuit floor heating boiler can be classified according to the principle of operation. This equipment may be convection or condensation. First, during combustion, steam is released that is led out through the chimney. Condensing boilers have a second combustion chamber. It accumulates waste steam, heated and passing through the heat exchanger. The latter takes the heat generated. These options have their advantages and disadvantages.
Convection boilers have a simpler design, which indicates that they are easier to control. And their price is lower than that of condensation models. The steam is completely discharged outside, so condensation does not form inside, which is very good, because excess moisture can be dangerous for the durability and safety of metal elements. But corrosion is not afraid of them here.
The removal of combustion products to the outside is carried out by natural draft, so there is no need to use ventilation equipment. Condensing double-circuit floor boilers have one important advantage, which is that they are able to use gas most efficiently. This is due to the fact that the devices provide a second combustion chamber, which helps to increase the efficiency by one and a half times or more. This is their main advantage over convection devices.
But there is only one drawback, but experts advise taking it into account. The installation is designed in such a way that requires constant condensation of the steam inside. This is possible only when the coolant is supplied to the circuit. Therefore, for heating the home, it is worth using powerful batteries with an impressive ability to heat transfer. When choosing a battery, it is better to give preference to aluminum or bimetallic varieties, but their installation is quite expensive. It should be borne in mind that a condensing double-circuit floor boiler will not work efficiently if old cast-iron batteries are installed in the system.
About the device and the principle of operation from the point of view of the combustion chamber
The described equipment may have a combustion chamber of one of two types, which are open or closed. Quite often, consumers wonder how they differ. The operation of the open chamber provides for air intake for burning fuel from the same room where the device is installed. Through the chimney, oxidation products are discharged to the outside. Therefore, the installation of the unit should be carried out only in a separate room, which has an intensive ventilation system. If this feature is not taken into account, the device will not work well due to a lack of fresh air. In this case, carbon monoxide will begin to penetrate into the home, which can create a danger not only to health. Moreover, it can even threaten a person’s life.
It is important to remember that gas boilers with an open chamber can only be installed in a separate room. For the normal functioning of such units, a vertical chimney is required, which will provide natural traction. The double-circuit floor boiler with a closed chamber functions according to a different principle. For such devices, a coaxial chimney is constructed, where combustion products penetrate using forced draft. The whole process is provided by an electric fan. One pipe is placed in another, larger diameter, which allows you to get the same coaxial chimney. Air enters through the outer pipe, which helps maintain the combustion process. But through the inner pipe, the combustion products are brought out. Such a chimney can have any direction - both vertical and horizontal.
Should I choose a boiler with a closed combustion chamber
A floor-mounted double-circuit gas heating boiler with a closed combustion chamber has several advantages. Among them, it should be noted that there is no need to allocate separate rooms for its installation, so the installation of equipment can be carried out inside the house. In addition, such installations are more efficient. But such boilers also have their drawback - without electricity, the fan stops working. This indicates that during a power outage, the heating system will stop working. This should be considered before purchasing such a unit.
The device and principle of operation in terms of burners
Burners in boilers are responsible for power. In boilers, they are mounted in chambers. Here is the combustion of fuel, which is accompanied by the release of heat. Oxidation products are discharged out through a chimney. A heat exchanger is located above the burner, which is a container with a coolant. When the combustion products are at the top, they rush into the chimney and heat the walls of the tank, which helps to increase the temperature of the coolant. In this case, water enters the external circuit through special nozzles.
A double-circuit gas heating boiler can have one of two types of heat exchanger. The most common today are plate and bithermic designs. The first consists of copper tubes and plates, which are treated with an anti-corrosion compound during the manufacturing process. One pipe provides heating, while the other is responsible for hot water. Heat is given to the environment through the plates.
Looking at the bithermic heat exchanger in more detail , you can understand that it has a different design. It provides for the presence of two tubes that differ in different diameters and are placed one on the other. The smaller one is used for hot water, while inside the larger pipe there is water for heating. Such a device is not so reliable, and the water quality is not very high. This is due to the fact that over time a precipitate forms on the walls of the tubes, clogging the interaxal space. The device from this ceases to work effectively.
Most popular manufacturers
If you are looking for a gas floor double-circuit boiler for a private house, then you should consider the most popular models of manufacturers that have proven themselves in the heating equipment market. Among other proposals, the Pechkin KSGV-16 model should be highlighted, the cost of which is 19,500 rubles. This device is intended for domestic use.
The device can be operated in a closed heating system. The boiler has a high efficiency and low fuel consumption. The capacity of this double-circuit floor gas boiler for a private house is 16 kW. The maximum consumed thermal power reaches 19 kW. Productivity is equivalent to 4 liters per minute, which is true when the temperature of the coolant reaches 25 ° C.
You may also be interested in the overall dimensions of the device, which are 720 x 340 x 490 mm. The unit weighs 53 kg. Heating temperatures range from 40 to 90 ° C. The maximum consumption of natural gas is 1.8 m 3 / h.
One of the famous manufacturers is Protherm. Description of the boiler "Bear 50 KLZ"
If you want to choose equipment for heating and water supply for your home, then you should pay attention to another model presented by the modern market - “Bear 50 KLZ“. Its cost is approximately 145,000 rubles. This boiler can operate on main and liquefied gas.
The unit is equipped with an open combustion chamber. To discharge combustion products, a fan should be connected to the boiler. The heat exchanger is made of cast iron, which increases the life of the equipment and reliability. To protect against coolant overheating, the system is equipped with a cooling circuit. Convenient start-up of the unit is guaranteed by electric ignition. Such double-circuit floor gas boilers for heating a private house provide a efficiency of up to 92%. Their power consumption is 130 watts. The maximum consumption of natural gas is 5.2 m 3 / h. The temperature of the hot water can vary from 40 to 70 ° C.
One of the leaders in popularity is Lemax. Description of the boiler "Premium 16N B"
When choosing equipment for heating and hot water supply, you should pay attention to the models from the Lemax company. Among the other proposals of the company should be highlighted "Premium 16N B". This device has an acceptable cost - about 25,000 rubles. The boiler is equipped with a robust casing made of 2 mm steel. You can use the equipment for an autonomous heating device.
The heat exchanger is reliably protected against corrosion by an enamel coating. Inhibitory formulations provide protection against aggressive factors. Such double-circuit floor gas boilers for home heating provide the consumer with the ability to connect equipment to liquefied gas. You can use the soft start option. The control panel consists of a thermometer and a temperature controller. With the help of the first you can track the heating temperature of the coolant.
This device has a power of 16 kW. The maximum consumption of natural gas is 0.95 m 3 / h. Heating temperature - 90 ° C. Such double-circuit Lemax boilers weigh 60 kg. They have many advantages, for example:
- convenience of service;
- advanced security protection system;
- increase in primary and secondary air flow;
- compliance of the boiler with all environmental and safety requirements;
- the ability to connect a room thermometer, with which the consumer will be able to adjust the temperature of the unit taking into account the indoor temperature.
Non-volatile equipment: "Premium-12.5 B"
One of the popular models is "Premium-12.5" from the manufacturer "Lemax". It costs from 21,000 rubles. The unit is a device for heating homes and cottages, the area of which does not exceed 120 m 2 . This equipment can be used for hot water supply. This non-volatile floor-mounted double-circuit boiler is designed for independent heating. This indicates that the consumer will not have terrible power surges that can disable equipment. This also applies to continuous power outages.
This equipment is also called atmospheric, because it has an open combustion chamber, which provides for the formation of a combustible mixture during air intake from the room, while the removal of combustion products is carried out due to the draft created by the vertical chimney. This gas floor-mounted dual-circuit non-volatile boiler does not have weather-dependent automation and a built-in Wi-Fi module.
Among the main technical characteristics, the minimum net power, which is 12.5 kW, should be highlighted. The efficiency is 90%. There is no expansion tank in this device. If you plan to carry out the installation yourself, then you may need the diameter of the chimney. It is 130 mm. The design provides for a primary cast steel heat exchanger; this equipment does not have a secondary heat exchanger. This also applies to the circulation pump. The heated volume reaches 336 m 3 .
Description of another non-volatile boiler: Lemax Premium-40 B
This model is also non-volatile and is a device for heating homes with an area of 400 m 2 . If you choose the described equipment, then you should be interested in the prices of double-circuit floor heating boilers at home. In the case of the described model, the cost is 42 130 rubles. The unit runs on natural gas, but if necessary, it can be converted to operate on liquefied fuels, for which it will be necessary to additionally buy a set of jets. This model belongs to the category of autonomous heating, which indicates non-volatility. The device is being assembled in Russia, which reduces the cost. Warranty from the manufacturer lasts for 36 months.
The unit runs on natural gas and has an open combustion chamber. The minimum net power reaches 40 kW. The efficiency of this double-circuit floor heating boiler of a private house is 90%. There is no expansion tank in the design. The diameter of the chimney may be needed by home craftsmen who plan to engage in installation work on their own. This parameter is 140 mm.
Conclusion
Before purchasing boiler equipment, you need to decide which unit you need - single-circuit or double-circuit. When choosing the second option, you will provide your house not only with hot heating, but also with hot water supply. However, it is also necessary to approach the issue of choosing a particular model with a high degree of responsibility. Indeed, such units are represented by different design solutions, which affects the cost and efficiency.