What are the types of gas boilers: their types and how they differ from each other
Gas boilers are the most commonly used source of autonomous heat production in country houses. This is because they have the lowest cost of thermal energy, weigh the least and have a 100% automation level.
Contents of the article:
- Types of gas boilers
- Condensing and convection gas boilers: what is the difference
- Single-circuit and double-circuit gas boilers
- Types of gas boilers according to installation method
- Types of gas boilers
- Condensing and convection gas boilers: what is the difference
- Combustion chamber type
- How to choose a boiler
the range of gas boilers on the domestic market of climate control equipment is diverse and functional, with a wide range of thermal power. Therefore, users need to choose a boiler for the long term. They must know how to buy correctly.
Types of gas boilers
Modern gas boilers differ in type of operation, design, type of installation, functions and controls. All these criteria are important when purchasing equipment, which is selected taking into account the needs of the user, the purpose of the room and the requirements of the gas supply service.
Ideally, the selection of a model should be carried out by a person who is thoroughly familiar with devices from different manufacturers. It is recommended to use a device that not only matches the request, but is also commensurate with the budget.
Condensing and convection gas boilers: what is the difference
Based on the principle of operation, convection and condensation boilers are distinguished: the first are conventional models, presented in a large assortment on the modern household appliances market; the second are advanced devices that are not yet familiar to Russian consumers; and third – the most advanced models, not yet familiar to Russian consumers.
Each of these types has its own disadvantages and advantages.
- Convection boilers have a simple design, affordable cost and a wide range. They heat the coolant due to the heat released during gas combustion. In this case, part of the heat is not used, and the presence of smoke makes the device less efficient – up to 92%;
- Unlike convection, condensing gas boilers use not only the heat released during fuel combustion, but also the energy of water vapor generated during cooling. For this purpose, an additional heat exchanger is installed in the equipment. Condensation from the exiting flue gas settles there, but additional heat is generated in the process. The efficiency of the device reaches 110% and there is one caveat: 100% is taken based on the amount of heat released during complete combustion of the fuel.
However, condensing boilers have one significant drawback. With a ratio of flow and return temperatures of 50°C to 30°C, they are extremely energy efficient. This mode can only be used in the European part of Russia or in houses where heating includes a “warm floor” system. In all other cases, it is better to prefer a conventional convection boiler.
Single-circuit and double-circuit gas boilers
You need to understand what exactly you need to choose between these two types of gas boilers. Heat only everything in the house or complex – both heating and hot water. Give your preference depending on this design.
Gas boilers are most often used as a source of autonomous heat generation in country houses. This is because they have the lowest cost of thermal energy, weigh the least and have a 100% automation level.
The range of gas boilers on the domestic market of climate control equipment is diverse and functional, with a wide range of thermal power. Therefore, users need to choose a boiler for the long term.
Depending on the purpose, the units are manufactured as single-circuit or double-circuit. They also differ in the number of heat exchangers installed, which can heat water for heating only or together for heating and hydraulic devices.
In addition, these devices are divided depending on the heat exchanger material – cast iron, steel or copper.
The most durable is the cast iron option, which resists corrosion processes well, but at the same time is considered fragile, especially fearing hydraulic shields with the start of cold equipment.
Copper is used in wall-mounted boilers and has high thermal conductivity. However, it is not advisable to install it in conjunction with aluminum radiators, since galvanic couples are formed that destroy aluminum.
Steel heat exchangers are most often used in floor-standing boilers and are inferior in their properties to the first two modifications.
Modern boilers are grouped depending on the degree of flue gas condensation on condensing or non-condensing units.
Double-circuit boilers
In double-circuit boilers operating on gas fuel, heating water circulates through two circuits.
Functions for switching between dual-circuit devices:
- Heating. In most modern boilers, the heating circuit starts automatically after the primary temperature sensor sends a signal to the control panel, increasing gas flow and circulation pump speed due to the forced coolant circulation system. The gas is burned in the boiler furnace. The hot flue gas gives off heat through a surface heat generator and heats the water, depending on the boiler model, from 75 to 90 °C. The centrifugal pump heats the coolant through the home heating system from the boiler to the radiator, cools it with water and returns it to the boiler for a new heating cycle;
- dis. When using the hot tap of the feedwater mixer, the three-way boiler tap transfers the coolant from the primary heat generator to the secondary one. In this mode, the boiler does not operate for heating. This is very inconvenient if the family is large. Significant heat consumption for hot water is required. During this period, the heating system may cool down.
Single-circuit
Single-circuit gas boilers have the simplest design and are usually installed in a heating system with a small heating area.
They are easy to operate and have the lowest prices among all gas heating units. Many modern boilers have the design option of connecting an external indirect heating boiler, which operates as a hot water accumulator.
At the bottom of the boiler there is a special pipe through which an external heat exchanger passes. This scheme is very efficient because the boiler makes better use of
When the water in the heating system drops below the set temperature schedule, the coolant is heated in the heating circuit, and when the desired temperature is reached, the three-way valve switches the coolant to heating water in the storage tank.
At the same time, the amount of water distributed by the hot water supply does not affect the quality of heating. To reduce heat loss in the heating system, experts advise placing indirect heating boilers close to the boiler unit.
Types of gas boilers according to installation method
All gas boilers are grouped according to floor and wall installation options. They all have their advantages and disadvantages. It is important to understand by what criteria the device will look its best, especially in conditions of lack of living space.
Wall boilers
These types of gas heating boilers appeared on the climate market relatively recently, but have already won the sympathy of users. The latest level of performance of wall-mounted gas units allows them to be used as modular mini-boiler rooms. The units are supplied with a factory package of auxiliary equipment, as well as with the main one. As a rule, their kits include a circulation pump, two heat exchangers, a fan, a safety group with control equipment and primary sensors, an antenna and an expansion tank.
These units have a multifunctional mode in which the fuel combustion process is 100% automated. They are easy to install and up to 92% more efficient, since all auxiliary equipment is carefully selected by the manufacturer to match the thermal output of the boiler.
Floor-standing
Floor-standing gas boilers are a traditional option for placing heating sources, which for centuries came from Russian stoves. These modifications are very important. Because, as a rule, they are equipped with powerful cast iron heat exchangers. Floor-standing devices are designed for heating large heating surfaces.
To increase the thermal power of the heating source, stubble fans are installed to organize forced circulation of flue gases.
Depending on the burner power, these inflatable burners with atmospheric pressure up to 80 kW are interchangeable with powers of several thousand kW. The operation of such devices depends on energy. Some types of floor-standing units can also be energy-dependent, when the heat exchange process is carried out without the need for an electrical supply. As a rule, these are low-power devices that can heat areas of up to 200 m2 using natural contours. Flue gas coolant and outlet.
Types of gas boilers
Modern gas boilers differ in type of operation, design, type of installation, functions and controls. All these criteria are important when purchasing equipment, which is selected taking into account the needs of the user, the purpose of the room and the requirements of the gas supply service.
Ideally, the selection of a model should be carried out by a person who is thoroughly familiar with devices from different manufacturers. It is recommended to use a device that not only matches the request, but is also commensurate with the budget.
Condensing and convection gas boilers: what is the difference
Based on the principle of operation, convection and condensation boilers are distinguished: the first are conventional models, presented in a large assortment on the modern household appliances market; the second are advanced devices that are not yet familiar to Russian consumers; and third – the most advanced models, not yet familiar to Russian consumers.
Each of these types has its own disadvantages and advantages.
- Convection boilers have a simple design, affordable cost and a wide range. They heat the coolant due to the heat released during gas combustion. In this case, part of the heat is not used, and the presence of smoke makes the device less efficient – up to 92%;
- Unlike convection, condensing gas boilers use not only the heat released during fuel combustion, but also the energy of water vapor generated during cooling. For this purpose, an additional heat exchanger is installed in the equipment. Condensation from the exiting flue gas settles there, but additional heat is generated in the process. The efficiency of the device reaches 110% and there is one caveat: 100% is taken based on the amount of heat released during complete combustion of the fuel.
However, condensing boilers have one significant drawback. With a ratio of flow and return temperatures of 50°C to 30°C, they are extremely energy efficient. This mode can only be used in the European part of Russia or in houses where heating includes a “warm floor” system. In all other cases, it is better to prefer a conventional convection boiler.
Combustion chamber type
Atmospheric burners are used in open combustion chambers. This requires air from the environment. In this regard, special requirements are imposed on the premises where such models are installed.
The area of the premises must comply with established standards. Normal operation of gas boilers of this type requires the chimney to be equipped with natural draft and the inevitable presence of a supply and exhaust ventilation system.
Gas boilers with closed burners are equipped with fans that direct air through a coaxial chimney. The latter consists of two pipes inserted into each other. Air from the street enters the burner through an external channel formed by the walls of the pipes.
The combustion products of the gas-air mixture are removed through the central section. This design ensures complete autonomy of the camera – the installation of a ventilation system in the room is optional.
Gas boilers are also equipped with manual or automatic controls and various safety devices. For example, automatic fuel delivery is switched off automatically. If the model does not have such a device, it is recommended to refrain from purchasing it.
How to choose a boiler
The choice of heating boiler should be approached responsibly. This is due to the fact that it must guarantee reliable heat supply to the house at the lowest negative temperatures and function reliably for at least 10 years.
When choosing, there are several important parameters to consider.
- Depending on the available area, the installation method will determine;
- The type of heating system is determined. Domestic home heating or heating and domestic hot water communal heating;
- Choice of options for preparing hot water: double-circuit boiler or flow-through type with indirect heating; remote heat exchanger; boiler drive;
- Selecting a power unit using a simple ratio for preliminary calculations: 1 kW per 10 m2 of heating area; for double-circuit boilers for heating a home-made house, at least 20% of the electrical heating power is additionally taken into account. A correction factor should also be introduced for objects with poor thermal insulation at home;
- Types of materials for heat-intensive equipment: cast iron, steel, copper;
- Type of coolant movement with natural or forced circulation;
- Types of flue gas removal: natural or forced using centrifugal fans;
- Volatility and emergency power systems: source of stabilizers and uninterruptible power supply;
- Regulatory and safety systems.
If we consider the key points in the design of the equipment, it becomes clear that the installation of such equipment is profitable and economical in terms of energy saving and maintenance. For example, double-circuit gas heating boilers, even if the secondary circuit fails, can be used for heating a house for many years. Heating efficiency is also influenced by the characteristics of the heated building or room: its area, the quality of thermal insulation and the level of natural heat losses.
