How to choose and use a double-circuit gas boiler

The double-circuit gas boiler has become very popular in the sales market. And deservedly so: thanks to its versatility, as well as its compactness and ease of maintenance.

The design and operation of the gas installation

Now, when choosing a heating installation, consumers give more preference to those that operate on gas, since it is considered cheaper and more affordable. Double-circuit boilers outperform single-circuit boilers in that they not only provide heat, but also provide hot water.

To choose the right installation, you should study its design, operation and technical properties. The double-circuit boiler consists of the following parts:

enclosures with thermal insulation;
burners;
automation;
heat exchanger.

Gas double-circuit products are reliable helpers in the house, as they heat the home, maintain the set temperature level in the system and heat water for domestic use. Their disadvantage is considered to be a significant waste of water when turned on. From the moment the tap is opened to heating up, it takes up to 40 seconds. This volume of water is considered idle and lost.

The gas boiler works automatically, so there is no need to influence its functioning. It is only necessary to control the temperature in the house with the help of a regulator. Schematically, the mode of operation can be divided into the following stages:

lowering the temperature in the home leads to the launch of the thermostat, which signals the system to turn on;
the water supply pump starts;
water begins to circulate in the system, which leads to an increase in pressure;
the reached predetermined pressure level instructs the microprocessor to ignite the burner;
the resulting temperature maximum acts with the help of automation to turn off the burner;
a decrease in the heating level leads to the start of the circulation pump and the burner, etc.

The double-circuit boiler is produced in 2 types: either floor-standing or wall-mounted. To select the appropriate installation, you need to know their properties.

Technical properties of wall units

Wall-mounted gas double-circuit boilers are lighter and smaller in size compared to floor-standing ones. On the market, they are presented in a large assortment of various modifications. Wall-mounted gas boilers are more suitable for small spaces. Their weight does not exceed 50 kg, the most popular dimension is 850 x 500 x 400 mm. Wall-mounted boilers have a power of 12-35 kW, which allows you to heat a dwelling with an area of \u200b\u200bno more than 400 m². The wall-mounted gas boiler is compact and easy to maintain.

Gas wall-mounted double-circuit boilers are less powerful than floor-standing ones and are sensitive to water quality. Since water from the water supply system enters the circuit for household needs, salt deposits form on the inner walls of the pipes, which can lead to breakage. Therefore, a wall-mounted gas boiler should be supplemented with a filter. Further repairs will cost much more. The cost of filters differs from the price of a double-circuit wall-mounted gas boiler by about 2 times.

Wall-mounted devices are not bulky, having a small size, they create great convenience. The gas double-circuit wall-mounted unit is equipped with the necessary components for installation, it is not difficult to connect to the home gas supply system. Experts do not advise using wall-mounted gas boilers for heating a two-story or three-story country house, since its power is not enough to heat all the rooms. For such houses, only floor gas double-circuit boilers are suitable, which are reliable, easy to repair and maintain, which are not afraid of mechanical stress. They provide warmth and comfort.

You can find wall-mounted gas boilers for heating a house with a secondary heat exchanger, which includes an internal and external thermostat.

The gas wall-mounted double-circuit apparatus is produced with 2 types of heat exchangers: monothermal or bithermic. Each of them has its pros and cons regarding price, water quality requirements, ease of use and repair. And this must be taken into account when choosing a boiler.

Double-circuit wall-mounted heating devices have a design that provides for the internal location of a pipe with hot water supply. This option loses to the outer one, since scale will accumulate faster in the inner pipe, and it will be more difficult to repair and replace the pipe.

The gas wall-mounted double-circuit boiler has an open combustion chamber. To remove harmful gases, wall-mounted boilers are equipped with a chimney with good draft. Since air is needed for combustion and so that there is no shortage of it in the room, it is necessary to place a wall-mounted double-circuit gas boiler in a separate place with a good air flow.

Technical properties of floor units

The double-circuit floor boiler is much larger, more powerful, it has a longer service life, due to its high anti-corrosion qualities, which the gas wall-mounted boiler does not have. The heat exchanger of the floor device is made of steel or cast iron, so it is not afraid of unfiltered water. Its efficiency is 90%, since the gas burns almost all, unlike solid fuels.

Being universal, double-circuit gas boilers can heat rooms with a large area and a small one. But their price is higher than the cost of wall-mounted boilers, so not everyone will be able to make such a purchase. To choose the right installation, you should take into account all the advantages and disadvantages of the product.

According to the method of power supply, double-circuit gas boilers are:

single-stage;
two-stage;
modulation.

Single-stage plants operate at one level of a given load. Two-stage double-circuit gas boilers are regulated by 2 values, and modulating installations are controlled by a measured load, from minimum to maximum. This eliminates unnecessary energy consumption.

Gas floor installations are complemented by a coaxial chimney. Through it comes air for combustion and removal of carbon monoxide. In it, the inner pipe is designed to remove poisonous gases, and the outer one is for the influx of air masses that support the operating mode of combustion.

Forced draft for air supply creates an electric fan. This is a significant drawback of the floor installation, which cannot be started in the event of a power failure.

Despite the great advantages, floor-standing devices have the following disadvantages:

the need to draw up documents for equipment - long and expensive;
dependence on electricity supply;
the need to create a chimney and ventilation duct;
decrease in efficiency and the appearance of soot when the gas pressure drops in the line.

In order to provide housing with warmth and comfort, one should be well acquainted with the installations that produce heat, their types, advantages and disadvantages. A specialist will help you with this.

If a double-circuit gas boiler is correctly selected, it will provide you with comfort and safety.