Variety of gas boilers with closed combustion chambers

A gas boiler with a closed combustion chamber is considered one of the most convenient options, since it requires minimal control from the owner during daily operation. Before installation, it is useful to study the principle of its operation and design, the main advantages and disadvantages, the rules of operation, as well as the features of its types that are commercially available.

The principle of operation of a gas appliance with a closed chamber

Open and closed gas boilers have differences regarding the basic principles of their operation. In a closed unit near the combustion chamber, there is no access to open oxygen, it is equipped with only two openings: for the chimney and air intake. The air intake element can be part of the chimney or installed as a separate pipe. The chimney allows exhaust gas and vapors to be removed, the air element allows fresh air to pass through.

In most models of closed boilers, there is a fan, which creates additional noise. For some buyers, this factor is critical.

Advantages and disadvantages

Boilers of this type have many advantages. They are most often chosen by the owners of small apartments and houses, since there is no need to allocate a separate room. The list of advantages includes:

• compactness and aesthetic appearance;
• no problems during installation and during operation;
• no need to install a vertical chimney and additional ventilation equipment;
• high efficiency combined with economical fuel consumption.

Devices in this category have only one drawback - dependence on electricity, since the elements of the burner and ventilation work from it. If the network is suddenly turned off, the house or apartment will be left without heating. To prevent the problem, you can additionally purchase a wood stove, fireplace or gasoline generator.

Chimney and heat exchanger

In order for a boiler with a closed combustion chamber to function fully, it will need a coaxial-type chimney. It includes pipes of various diameters, which are inserted into each other. Through a large pipe, air goes to the boiler from the side of the street, with the help of a pipe with a small diameter, the gas comes out and is immediately cooled.

Thanks to modern engineering solutions, there is no need to install additional ventilation for units of this type. The combustion products do not affect the atmosphere, since the fuel burns out completely.

Heat exchangers are among the main parts of heating units, since they transfer energy to the heat carrier from the burned-out fuel. They are divided into three types, taking into account the material of manufacture and are steel, copper or cast iron. Steel options are inexpensive, but rust quickly, copper counterparts are considered more durable. Cast iron is no less durable than copper, but cracks often form on them during operation.

Variety of gas boilers with a closed chamber

Gas boilers with a closed chamber for heating are single-circuit or double-circuit.Single-circuit ones are designed to warm up the house, double-circuit ones, in addition to this function, are also used to heat water. Single-circuit models are cheaper, if necessary, you can buy additional parts and a boiler for them. But in such a situation, the total price of the unit will significantly exceed the price of a standard two-circuit analogue.

Single-circuit

Single-circuit devices have practically no drawbacks, they are completely independent of the water supply pressure and provide uninterrupted supply of hot water. Also, there are no limits for them in terms of the amount of water used in each of the installed taps.

Double-circuit

A double-circuit unit is cheaper when compared with a single-circuit analogue and its additional equipment. It has a compact size, takes up a minimum of space, and does not require much effort during installation. This is a fairly economical option, since the appliance only heats a certain amount of water.

Of the minuses, the owners of such units note problems with the temperature of hot water, which is affected by the pressure of the water pipes. The temperature will drop when several taps are opened at once, if they are too far from the boiler, it will take longer to wait for the water to heat up. This disadvantage is absent in double-circuit units with storage tanks up to 60 liters or with layer-by-layer heating boilers. Water is supplied there at the same temperature.

Floor standing boilers

Floor-standing appliances require a special room, since they are large in size and have increased power when compared with wall-mounted appliances. The list of their advantages includes cast iron heat exchangers, the service life of which is up to thirty years. They do not need a high draft chimney.

There are also disadvantages - floor-standing boilers take up space on the floor, since, due to their weight and dimensions, they cannot be hung on the wall. For this device, you will need an expansion tank and the creation of a storage piping.

Wall mounted boilers

Wall mounted appliances are most often used in urban areas and small cottages due to their compact size and convenience. They are easy to install and maintain.

Boiler operation without power supply

Boilers with closed chambers can operate without electricity, but for this purpose they will need additional equipment. It is worth choosing it depending on the needs and type of a particular device.

Power generator

A gasoline or diesel electricity generator can fix a power problem if there is no electricity source in the home. Standard generators are not suitable for foreign-made boilers. For such a device, you will need to purchase a stabilizer that converts the voltage into the desired type of sinusoidal form while maintaining stable standard values.

Uninterruptible power supply

Sources for uninterruptible power supply or UPS also help to eliminate the problem in the absence of electrical energy for combustion. They do not require much power to light the burner flame and turn on the fan. This is a more economical method compared to a generator, therefore it is used if there is no voltage at all in the network. UPSs have many advantages, including no noise during operation and no connection problems, ensuring autonomy, no maintenance costs and no consumables.

UPSs made using dual converter technology can provide a full sine wave in battery mode and on line voltage. It is necessary to select the capacity of the non-volatile battery for them, taking into account the time during which the UPS will have to support the boiler in the operating stage.

Since the power of standard boilers varies in the range of 50-300 watts, the current strength should be no more than 70-400 volt-amperes with an acceptable difference.