How does a floor-standing gas boiler with a closed combustion chamber work?

A burner, which is hidden in a sealed housing, is used to intake air and remove by-products of the unit. The air flow comes from the street, and all waste is discharged through a coaxial chimney. Advanced units are equipped with a system of forced smoke removal and air injection by a turbine.

When passing through the heat exchanger, the gas accumulates and heats the coolant. It is customary to use stainless steel as the material for manufacturing the part.

The structure consists of:

1. Cases.
2. Heat exchanger.
3. Combustion chambers.
4. Circulation pump.
5. Coaxial pipe.
6. Housing filters.

Both single- and double-circuit boilers with a closed burner are available for sale.

The first type is in demand for those rooms where only heating needs to be provided. Among the advantages of the units are:

1. High efficiency - all thermal energy is directed to heating, which reduces fuel consumption. A unit with one circuit is capable of heating spacious buildings with high ceilings.
2. Possibility of conversion for DHW. To modify the device, just connect an indirect heating boiler to it. The optimal tank capacity varies from 100 to 2500 liters and is selected taking into account the owners’ daily need for hot water.
3. Resistance to intensive use. Most breakdowns are associated with the failure of the second heating circuit. In single-circuit models there is no additional heat exchanger.
4. Affordable price. Options with one circuit are much cheaper than with two.

A double-circuit unit with a closed burner consists of heat exchangers that heat the coolant and water. It has the following features:

1. Type of heat exchangers. Stainless steel is used to make the heating circuit, and the DHW coil is made of aluminum alloy or copper.
2. Operating mode. Household floor-standing appliances have two of them – “Winter/Summer”. During the cold season, both circuits are turned on. In summer, only water is heated.
3. Availability of a buffer tank. This container accumulates hot water and then distributes it for domestic needs. The reservoir is connected to a recirculation system, so the heated liquid is supplied immediately after opening the tap.

In addition to traditional heat generators with a closed burner, condensing models with a cylindrical coil are available for sale. Their efficiency reaches 98%, while simple analogues have an efficiency indicator of no more than 92-93%.

Advantages and disadvantages of floor-standing gas boilers

Gas boilers are divided into wall-mounted and floor-standing models. So, about 60% of all gas equipment are floor-standing boilers. Their design is so perfect that the system has not undergone significant changes for several decades. The system is a volatile equipment characterized by low hydraulic resistance. Floor structures are equipped with fire-resistant burners designed for mixing.

The main advantages of floor-standing gas boilers:

• High coefficient of efficiency (efficiency). With the correct selection, installation and operation of gas equipment, the average efficiency reaches 90%. Regardless of the outside temperature, type of equipment and type of fuel. Floor-standing gas boilers are suitable for heating even very large houses.
• The operation of the equipment involves the release of minimal concentrations of harmful substances into the atmosphere. Consequently, the use of gas boilers in the house is safe for life and health (provided that the equipment operates correctly and is used).
• Models with high-quality assembly and made of high-quality materials, with proper use, have a long service life. The average service life is 20-25 years.
• Possibility of connecting additional monitoring sensors to maintain optimal pressure and temperature parameters.
• Easy to use. The dashboard is equipped with several on/off buttons, a temperature regulator and a fuel supply valve.
• Natural gas has a low cost, making financial costs significantly lower compared to using electric boilers.
• Finally, it is also worth mentioning the silent operation of the equipment.

Despite the extensive list of advantages, floor-standing gas boilers, unfortunately, are not without disadvantages.

Among the main disadvantages are:

• It is mandatory to have a chimney and a specially designated room for the boiler; its area must be at least 8 sq.m.
• Leakage hazard and failure susceptibility.
• Before installation, the home owner must obtain all necessary permits for the operation of gas equipment.

Which floor-standing gas boiler is better to choose?

The choice in favor of gas equipment is due to cost-effectiveness of use, since natural gas has the lowest price in comparison with alternative energy sources. However, to obtain maximum benefit, it is important to select the correct equipment and install and maintain it in accordance with all specified requirements.

When choosing floor-standing gas boilers, you need to pay attention to the following criteria:

• Design and material of manufacture of the heat exchanger . For high-quality and long-term operation of the equipment, the heat exchanger must be durable and conduct heat well. Today it is made from copper, cast iron and stainless steel.
• The number of circuits with which the equipment is equipped . Single-circuit boilers are intended exclusively for heating a house; they cannot be used to provide households with hot water supply. Of course, you can additionally install a water heating tank, but it is easier to purchase a double-circuit boiler. Such models are equipped with two heat exchangers, which are connected to two mains: one is responsible for heating the house, the second for hot water supply.
• Type of ignition, burners and combustion chamber . To maintain combustion in the boiler, it is necessary to provide continuous access to oxygen. It can enter the firebox from the street or indoors. If oxygen from the room is compensated, then the equipment is equipped with an atmospheric burner; if from the street, then with a closed burner with forced injection. Combustion chambers, in turn, are also divided into several types: open and closed. Models equipped with an open combustion chamber require a constant flow of air to burn natural gas. Gas boilers with a closed combustion chamber force air through the pipe using a fan. Condensing boilers always have a closed combustion chamber, so they are always more efficient and have higher efficiency.
• Automation, diagnostics and adjustment . To further simplify the operation of gas equipment, if financial capabilities allow, it is better to give preference to models with “electronic filling”. Power control is divided into the following types: smooth with flame modulation, single-stage and two-stage. It is recommended to purchase two-stage boilers in regions with harsh winters; in warm regions there is no need for it.

The choice of floor-standing gas boilers for country and private houses is very large. To narrow your search, it is recommended to carefully study the models presented in the ranking of the best floor-standing gas boilers in 2022.

TOP 15: best floor-standing gas boilers of 2022

The best single-circuit floor-standing gas boilers

The best double-circuit floor-standing gas boilers

The best inexpensive floor-standing gas boilers (up to 20,000 rubles)

TOP best floor-standing gas boilers

Rating of TOP 10 best models

The best single-circuit floor-standing gas boilers

Boilers of this type can only provide heating for the house, and for hot water supply, as a rule, the installation of an additional boiler is required. Nevertheless, single-circuit models are in great demand, largely due to their attractive price. Below we present to you the top 5 floor-standing gas boilers of this type.

Lemax Premier 11.6

Stylish and attractive single-circuit floor-standing gas boiler.

Single-circuit gas boiler Lemax Premier 11.6

First on the agenda is a stylish model from the Russian company Lemax. The clear advantage of Lemax Premier 11.6 (RUB 24,300) is that the device does not require connection to the mains, which means that at least it is not afraid of voltage surges. At the same time, the boiler is quite powerful, as can be seen from the overall efficiency of 90%. The model is easy to install - it can be connected to both vertical and horizontal chimneys. Effective removal of gases and other combustion products is provided by the Lemax turbo nozzle of the Comfort SE series, and it works even in the absence of a chimney. The heat exchanger is made of steel, additionally coated with anti-corrosion enamel and a special inhibitor composition for a more durable service.

Main characteristics

• Combustion chamber: open
• Efficiency: 90%
• Control: mechanical
• Primary heat exchanger material: steel
• Fuel: natural gas
• Natural gas consumption: 1.16 cubic meters m/hour
• Nominal natural gas pressure: 13 mbar
• Max. coolant temperature: 90 °C
• Max. water pressure in the heating circuit: 1 bar
• Weight: 41.5 kg

Advantages:

• Does not require connection to an electrical outlet.
• Reliable heat exchanger, resistant to corrosion and aggressive salt solutions.
• Safe use is ensured by a system of protection against interruption of traction and blowing out of the heating apparatus.
• High-quality, forced removal of combustion products to the outside.
• Not too noisy.

Flaws:

• Not the most universal color (red and black).
• Hard to find service.
• Bulky.

Design and principle of operation

Apart from the increased strength of important parts and assemblies, there are no fundamental differences between the types; the main elements look like this:

1. First heat exchanger.
2. Burner.
3. Second heat exchanger.
4. Circulation pump.
5. Turbocharging
6. Control Panel.

Taking into account the specified parameters, the coolant is heated and enters the heating system; it returns through the return line for the next cycle. When water leaves the first heat exchanger, it gives up some of the heat in the secondary unit to heat the liquid there to operating temperature.

Thanks to the three-way valve, the coolant is mixed with cooled water and reaches the required temperatures, after which it is sent into the main line. Gas combustion products are discharged through a chimney; there are models with natural draft and a turbocharger fan.

The best double-circuit floor-standing gas boilers

Double-circuit models are more versatile, as they provide both heating and hot water supply. The following TOP 5 best boilers of this type include devices from a wide variety of price segments.

Vaillant ecoCOMPACT VSC INT 266/4-5 150

Premium double-circuit floor-standing gas boiler.

Double-circuit gas boiler Vaillant ecoCOMPACT VSC INT 266 4-5

And the premium double-circuit boiler from Vaillant opens a small rating - ecoCOMPACT VSC INT 266/4-5 150 (RUB 317,500). This model is also a condensing one - such boilers have higher efficiency than classic gas boilers, on average by 12-17%. Here this figure reaches 106.5%. In addition, condensing technologies can significantly save energy. The burner and heat exchanger are made of stainless steel, which guarantees a long service life of the boiler.

The water heater is characterized by layer-by-layer heating of water - this means that it is completely ready for operation almost immediately after being turned on.

Main characteristics

• Thermal power: 5.20 - 25 kW
• Thermal load: 5.50 - 25.50 kW
• Combustion chamber: closed
• Efficiency: 106.5%
• Control: electronic
• Built-in boiler volume: 150.8 l
• Built-in expansion tank: yes
• Expansion tank volume: 12 l
• Natural gas consumption: 3.24 cubic meters m/hour
• Nominal natural gas pressure: 13 - 20 mbar
• Coolant temperature: 30 - 80 °C
• Temperature in the DHW circuit: 35 - 65 °C
• Max. water pressure in the DHW circuit: 10 bar
• Weight: 126 kg

Advantages:

• Modulating burner and reliable heat exchanger made of stainless steel.
• The efficiency corresponds to almost 107%.
• Energy saving and environmental friendliness.
• Possibility of connecting or using air from the room.
• Convenient electronic control, you can configure almost any parameters of the boiler operation.

Flaws:

• High price.
• Bulky (126 kg).
• Marking surface.

Lemax Premium-30B

Powerful double-circuit floor-standing gas boiler.

Double-circuit gas boiler Lemax Premium-30B

Next comes a cheaper option - a double-circuit gas boiler Lemax Premium-30B (42,000 rubles). This boiler can rightfully be considered a universal model, since its power is enough to heat rooms up to 300 square meters. This makes it the optimal solution for both small country houses and impressive industrial premises. An open combustion chamber means that the air for operation is taken directly from the room. And the removal of combustion products is carried out due to natural draft.

Like the vast majority of gas boilers, Lemax Premium-30B can operate either on natural gas or liquefied gas.

Main characteristics

• Max. thermal power: 30 kW
• Heated area: 300 sq.m
• Efficiency: 90%
• Control: mechanical
• Natural gas consumption: 3.5 cubic meters m/hour
• Nominal natural gas pressure: 13 mbar
• Max. coolant temperature: 90 °C
• Hot water capacity at 30°C: 8 l/min
• Max. water pressure in the DHW circuit: 6 bar
• Max. water pressure in the heating circuit: 3 bar
• Weight: 88 kg

Advantages:

• Non-volatile.
• Reliable protection system, including functions such as control of overheating, draft interruption and flame blowing.
• Reliable steel heat exchanger, resistant to corrosion and aggressive saline solutions.
• The maximum heated area is 300 m2.
• Quite compact, made in a universal design.

Flaws:

• Noisy.
• Unreliable mounting of temperature sensors.
• Not the most budget option.

The best equipment: consumer opinion

According to the owners of gas heating systems and specialists servicing the equipment, the best among foreign manufacturers are the German brands Bosch, Wolf, Buderus, Vaillant, the Slovak brand Protherm, the Italian BAXI and the Korean Navien.

Among domestic manufacturers, the Conord Plant from Rostov-on-Don and the Zhukovsky ZhMZ have proven themselves well. Let's look at several models recognized as the best.

Bear 30 KLOM from Prothrem

Floor-standing single-circuit device with an open chamber and a cast iron heat exchanger. Equipped with a modulating burner made of stainless steel. It is possible to arrange forced removal of flue gases.

The heat exchanger is equipped with a condensation protection system; if necessary, its sections can be replaced. The boiler is compact in size, has a cooling circuit, an automatic control system and two operating modes “Summer-Winter”. Device power 26 kW.

EcoVIT VKK INT 366 from Vaillant

A single-circuit boiler operates using condensing technology. Capable of heating up to 340 sq. m, power – 34 kW. If it is necessary to provide domestic hot water, it is well compatible with an external storage boiler. The model has an efficiency of more than 100%, which makes it very economical.

The Comfort floor-standing boiler from the Zhukovsky plant is an excellent budget solution for providing heat to your home

Equipped with a multi-sensor control system and a closed-type modulating burner. An economical electronic ignition is used for ignition. The boiler can be connected to external control, which allows it to be integrated into the Smart Home system or controlled remotely.

AOGV-23.2-3 Comfort N from Zhukovsky plant

Inexpensive domestic boiler with improved environmental performance. Fully adapted for operation in Russian conditions, capable of stable operation at low gas pressure.

Non-volatile, can be built into systems with gravitational or forced circulation. Equipped with a dial thermometer and piezo ignition. Extremely easy to operate and maintain. The burner is easy to clean and replace.

The following article on this issue will provide an overview of popular models of gas boilers operating on liquefied gas.

The best inexpensive floor-standing gas boilers under 20,000 rubles

There are now incredibly many options for floor-standing gas boilers. Finding a model suitable for any budget will not be difficult, and installing such a device will allow you to significantly save on heating. We selected the five best gas boilers, whose cost does not exceed twenty thousand rubles.

Pechkin KSG-10

A good inexpensive single-circuit gas boiler.

Budget gas boiler Pechkin KSG-10

The mini-rating of budget floor-standing gas boilers opens with a very worthy and affordable model - Pechkin KSG-10 (12,000 rubles). In fifth place is their single-circuit model KSG-10 - the most budget-friendly in this selection. This is a fairly standard steel boiler, designed for heating small houses - up to 100 square meters. The device has a simple and reliable design. In addition, it is very compact, and therefore easy to install and install, saving space in the room.

Despite the low cost, the boiler has high safety indicators. On the contrary, the levels of harmful emissions here are record low.

Main characteristics

• Max. thermal power: 10 kW
• Heated area: 100 sq.m
• Efficiency: 87%
• Natural gas consumption: 1.1 cubic meters m/hour
• Nominal natural gas pressure: 13 mbar
• Coolant temperature: 40 - 90 °C
• Max. water pressure in the heating circuit: 1.5 bar
• Weight: 35 kg

Advantages:

• Affordable price.
• Reliable and high-quality assembly.
• Easy installation, compactness and small dimensions (weight – 35 kg).
• The service life is on average 15 years.
• Safe and environmentally friendly.

Flaws:

• Inconvenient magnetic lock on the door.
• Not very modern design.
• Noisy.

Pechkin KSGV-16

A popular 16 kW gas boiler from the budget segment.

Budget gas boiler Pechkin KSGV-16

Next comes another boiler from Pechkin, with a capacity of 16 kW - KSGV-16 (RUB 19,500). The maximum heated area in this case is slightly larger - 160 square meters. The main advantage of the boiler is that it is double-circuit, which means it can provide both heating of the house and hot water supply. This model does not require a power connection, which makes it resistant to power surges and ensures stable performance. Safety when using the boiler is guaranteed by the gas control function, as well as protection against overheating. Pressure indicators are easy to monitor using the pressure gauge located on the front panel.

Main characteristics

• Max. thermal power: 16 kW
• Heated area: 160 sq.m
• Efficiency: 88.5%
• Natural gas consumption: 1.8 cubic meters m/hour
• Nominal natural gas pressure: 13 mbar
• Coolant temperature: 40 - 90 °C
• Max. water pressure in the heating circuit: 1.5 bar
• Weight: 53 kg

Advantages:

• Double-circuit boiler - for heating and hot water supply.
• Large heated area (up to 160 m2).
• Non-volatile model, works stably and without interruptions.
• Unpretentious service.
• Long service life (at least 20 years).

Flaws:

• An outdated design will look bad in a modern interior.
• Noisy.
• Thermometer is missing.

Types of closed boilers

The classification of heating devices is conditional; they are distinguished by the material of manufacture of the housing, heat exchanger, installation method and air supply.

Material of manufacture

• Steel has high power and efficiency.
• Cast iron is distinguished by its heavy weight and long service life.

By installation method

• Floor-mounted ones are placed on a specially equipped pedestal or in a boiler room.
• Wall mounted ones with strapping elements are mounted on the wall. Approved for use in apartment buildings.

Depending on the functions performed

• Single-circuit ones serve only to supply heat to rooms.
• Double-circuit heat the coolant for heating and domestic needs. A heated floor system is connected to them; some models have a built-in water heater.