Archive series. Floor-mounted gas boilersHearth KChG 15 – 71 kW

Looking through the archives of residential heating systems, floor-mounted gas boilers are one technology that sticks out for its dependability and effectiveness. We are focusing on the Hearth KChG series, which has power outputs ranging from 15 to 71 kW. For many years, these systems have been the backbone of residential heating, bringing warmth and comfort to countless homes.

When it comes to home heating, dependability and efficiency are critical. Both of these are areas where the Hearth KChG series of gas boilers excels. You can find the ideal match for your house, no matter how big or small, thanks to the variety of sizes that are offered.

The Hearth KChG series’ floor-mounted design is one of its best qualities. This guarantees simple installation and upkeep while also conserving valuable space in your house. Furthermore, these boilers have a robust construction that ensures years of dependable operation.

However, what distinguishes the Hearth KChG series from other gas boilers available in the market? It is the ideal fusion of cutting-edge technology, robustness, and efficiency. With their optimized energy efficiency, these boilers will help you cut down on your energy costs and carbon footprint.

With the Hearth KChG series, you can install a new heating system in your home or upgrade your old one with a dependable and effective solution. Come along as we examine the features and advantages of these gas boilers that are installed on the floor and learn why homeowners who want warmth and comfort choose them over other options.

Model Heating Capacity (kW)
Hearth KChG 15 15 kW
Hearth KChG 20 20 kW
Hearth KChG 25 25 kW
Hearth KChG 30 30 kW
Hearth KChG 35 35 kW
Hearth KChG 40 40 kW
Hearth KChG 45 45 kW
Hearth KChG 50 50 kW
Hearth KChG 60 60 kW
Hearth KChG 71 71 kW

Models and their characteristics

Let’s take a look at the technical specs of the most widely used Ochag gas boiler models.


The economical price of this energy-dependent single-circuit device is one of its best features. It will probably cost 10,000 rubles. Steel is the manufacturing material. The device is easy to use and convenient; it is available in a floor version.

The Ochag KSG-7 AT gas boiler

While using less fuel than other models, this 80 m² gas boiler from Ochag can heat a room efficiently. Details:

  • power is 7 kW;
  • high efficiency – 85 %;
  • water pressure – 0.1 MPa.

Even with the pipeline’s minimum pressure, the unit operates without interruptions or malfunctions. The set comes with a steel compact heat exchanger, a built-in pressure and draught stabilizer, and a gas block. The stainless steel used to make the burner is heat-resistant. Because the gas is connected from both sides and the cladding is easily removable, servicing it is easy and convenient. A condensate collection device exists.

Customers comment on this model’s positive traits. Liquid gas can be used as fuel if the burner jets are changed.

KNG 24

Such equipment is roughly priced at 25,000 rubles. It is a compact, wall-mounted, two-circuit model. has a chic design.

The device is completely silent when in use, so you can mount it anywhere in the room without experiencing any discomfort.

The current parameters are displayed on a liquid crystal screen located on the front panel. The boiler can be used for water heating as well as for heating buildings that have water heating systems installed.

  • High performance, efficiency reaches 90%;
  • Efficiently heats rooms up to 220 m²;
  • The maximum heating power is 24 kW;
  • there is an auto ignition;
  • gas consumption is 2.6 m³/hour.

It is possible to connect these units to a floor heating system. Combustion chamber: closed; operates with either liquid or natural gas. There are multiple levels of automated security offered. The Ochag KNG 24 boiler weighs thirty-six kg.


The KSG-11 floor gas boiler Ochag is intended for a variety of heating applications in buildings.

Easy and convenient installation, t.к. Gas is able to connect from any direction. The user can mount the door on whichever side is most convenient for them.

A condensate collection device is present, with a steel heat exchanger and 30 mm of heat insulation. Low flame combustion type; when in use, the device produces no noise.

  • heat output is 11 kW;
  • The maximum area that can be heated by the unit is 125 m²;
  • EFFICIENCY – 85-90%;
  • Gas consumption is 1.34 m³/hour;
  • weight – 48 kg.


Boiler type: combination single-circuit; maximum output: 16 kW. The appliance runs on coal and gas. intended to provide heat to spaces up to 160 m². Without flame modulation and auto ignition, this installation is floor standing. 75% EFFICIENCY.


The floor-standing unit has a 10 kW heat output and can heat a space up to 100 m².

The Ochag KSG-7 AT gas boiler

1.11 m³/hour is the fuel consumption. The device costs eleven thousand rubles.

Fuel made of liquefied gas can be used if the burner jets are changed. The unit’s dimensions, which are 25x47x75 cm, are small. 48 kg in weight. 18 liters is the tank’s capacity.


Ochag KSG-7 E is a floor single-circuit gas boiler that operates steadily even at low gas supply pipe pressure. It is compact, attractively designed, uses fuel efficiently, and efficiently heats homes up to 80 m². The device has a weight of 37 kg.

There is no flame modulation, no auto-ignition, and the combustion chamber is open. Although this model is cheap, its functionality is extremely limited.

In summary, among the various heating appliances available on the domestic market, gas boilers Ochag have a legitimate place. A plethora of models sorted by price, appearance, and technical attributes enable each user to select the best fit. The majority of owner reviews for Ochag boilers are favorable. Their effectiveness and simplicity of use are recognized.

Additionally, German, Japanese, Korean, Czech, and gas boilers are worth mentioning.

Boiler Hearth device

The Ochag boiler’s structural layout allows it to be easily incorporated into any type of heating system. The front door can open from the left or the right side and can be adjusted to suit the situation. Coolant can be supplied from a convenient side of the installation thanks to two return lines on the side and back.

Ochag boiler consists of:

  • Boiler body
  • Control automatics
  • Heat exchanger
  • Second circuit (if the boiler is double-circuit)
  • Security system

The furnace chamber, which is situated in the lower portion of the body, is enclosed by water jacket sections on both the side and the back. Above the furnace chamber is a heat exchanger. The developed convective part of the heat exchanger, which consists of "flame" pipes, realizes high efficiency heat transfer and heat exchange between flue gases and coolant.

The heat exchanger has a smokebox with an integrated draught stabilizer located in its upper section. A boiler outlet pipe is located in the upper section of the smokebox, and a draught sensor is located in the front. The diameter of the outlet pipe and the chimney cross-section must match when installing the boiler in the chimney. The chimney’s technical specifications must line up with those listed in the operation manual.

A blocking plate in the middle of the smokebox ensures steady appliance operation no matter what the weather does. Without user input or manual adjustments, the heat exchanger with smokebox guarantees the boiler operates efficiently. In the event of an unstable draft, the draught stabilizer helps the boiler run steadily.

Within the appliance’s furnace chamber is a gas burner made by Service Gas Company in Russia. It is made up of burner tubes, burner panels, draught and flame sensors, and an SABK AT control unit.

Beneath the burner tubes is a distribution grille that is easily removable. intended to provide secondary air for burning

Ensuring that there is unrestricted airflow from the boiler’s lower section to the burner tubes via the distribution grate is crucial when installing the boiler hearth in the space.

The boiler needs to be installed with enough space between it and the floor to accommodate a person’s feet. Both the left and right sides of the Ochag boiler can be linked to the gas main. This lets you handle the unit’s design. The temperature of the room is indicated by a temperature sensor on the front panel.

The most common models

Customers typically select the following "Ochag" boiler models:

  • KST-16 M. It is a miniature model with a single circuit (used only for heating). The power of the unit is 16 kW and is designed for heating small houses with a total area of not more than 150 square meters. Works on any type of solid fuel. If desired, the boiler can be retrofitted with electric heaters. The peculiarity of this model is long breaks between refueling. It is equipped with SABC automatic control system, which is considered to be one of the most reliable and convenient.
  • KST-20 M. Single-circuit boiler, designed for heating premises up to 200 squares. This model is energy-dependent, but it is characterized by high functionality and ease of use.
  • KST-31,5 M. Single-circuit boiler, recommended for use in premises up to 300 squares in area. Can work on all types of fuel (subject to installation of additional equipment). When using solid fuel, the interval between loads is at least 8 hours.

  • KSTV-20 M. This is a two-circuit equipment, used both for space heating and for obtaining hot water. The models use steel heat exchangers. It can operate on various types of fuel. This model has a capacity of 20 kW, it is recommended for premises with the area not more than 200 squares.
  • KSTV-31,5 M. Two-circuit powerful unit with an open combustion chamber and heat exchangers made of steel. Suitable for use in rooms of about 300 square meters, can work both on coal or wood, and on gas (after installing a gas burner).

How to understand the markings?

Ochag heat generator labels are written in both letters and numbers. The boiler capacity is indicated by numbers; for example, the model KST-20 M has a 20 kilowatt capacity. The following is how letter designations are interpreted:

  • K – boiler (this letter is present in the marking of all models).
  • C – steel is used for manufacturing of the model, the heat exchangers and the boiler shell are also steel.
  • T – model is designed for operation on solid fuel.
  • D – the model can be used to work on gas, provided that a special burner is installed.
  • B – this letter is used to designate two-circuit models, that is, which work not only for heating, but also for the supply of hot water.
  • M – modified models that allow the installation of electric heaters.

gas parapet boiler Ochag

Boilers for parapet heating Ochag have the unique quality of not requiring the installation of a costly chimney. The heater comes with a smoke exhaust pipe. Before hanging the device, the wall needs to have a hole cut for the chimney spigot. As a result, only the wall that faces the street may have the heater installed. The chimney isn’t meant to be blown into by the wind.

Examine the chimney’s design carefully.

In this range are two models:

  • KSGZ – single-circuit;
  • KSGZV – two-circuit.

The fundamentals of a two-circuit boiler’s operation have already been covered in one of our articles. The units have a 10 and 12.5 kW power capacity. Automatic systems SABK-AT (labeled with the letters "AT") and Eurosit (labeled with the letter "E") are fitted to the boilers. Parapet boilers have a closed combustion chamber and are not designed with any energy-dependent components. The smoke exhaust pipe from the street provides air for the flame.

The unit can function in a gravity system with natural circulation because the cross-section of the conditional passage of the sockets for connection to the heating circuit is 5 cm.

The boiler’s exterior is lined with foil and insulated with minwool. In addition, the casing is simply detachable for cleaning access to the heater elements. The heat exchanger’s protection from scale and salts eliminates the need for cleaning, which streamlines the unit’s operation. Are in charge of the wick’s flame and draught sensors for safety. The unit’s igniter doesn’t need to be adjusted because it doesn’t release soot when it operates. It operates at 89% efficiency. 2.5 years of warranty. Regarding the heat exchanger’s cleaning.

Household boilers Ochag KSG, KSGV have 3 degrees of protection in emergency situations

  • at extinguishing the flame on the ignition burner;
  • in the absence of draught;
  • in case of gas supply interruption.

Within the category of gas floor heating boilers, Ochag KSGV two-circuit heating boilers and KSG single-circuit heating boilers are manufactured.

A high-efficiency steel heat exchanger is included with these floor-standing boilers from OCHAG KSG. The extensive high-speed heat removal method with a smaller boiler coolant volume is used to achieve high efficiency and the best possible removal of gas combustion energy by the convective heating surface.

Regardless of the gas pressure in the network, a gas pressure stabilizer integrated into the domestic boiler’s gas block ensures consistent heat production and uniform combustion of the gas-air mixture on the main burners.

The main gas burners are positioned uniformly beneath the heat exchanger, preventing the formation of localized zones of overheating and subsequent heat exchanger destruction. The burners are made of heat-resistant stainless steel with slotted slots.

Applications for boilers can be sent to strategia@list via email.We will get in touch with you as soon as possible. Please send us a message at your email address.

Advantages of domestic heating boilers OCHAG on gas KSG, KSGV

  • These boilers of OCHAG brand have a high-efficiency steel heat exchanger, which allows to achieve high efficiency.
  • Design and small size of the domestic boiler, hidden automation allows to harmoniously fit into any interiors of the room.
  • Modern design and technological developments used in this heating boiler allow it to be easily serviced and operated.
  • Full energy independence from external sources of electricity.
  • Multilevel quality control makes the domestic heating boiler reliable and durable.
  • Domestic heating boiler Ochag KSG, KSGV is designed for heating of residential premises and hot water supply in the presence of a water heater.
  • Possibility of operation at reduced gas supply pressure.
  • Heating boiler does not require adjustment at atmospheric changes all processes of gas combustion are automated.
  • There is a draft stabilizer that maintains constant pressure in the furnace and a gas pressure stabilizer that maintains constant output of the main burner.
  • There is a variant of arrangement of gas floor standing boiler with electronic automation SABK-E.
  • Equipment of the boiler Ochag Italian automation EUROSIT.

Technical characteristics of gas boilers Ochag

Gas boilers that are floor-standing Warmth

Boiler output rated in kilowatts

The approximate square footage of the heated room at a height of 2,7 meters

Boiler efficiency Ochag,%

Gas flow rate from the boiler hearth, in cc м/h

Coolant temperature regulation range, °Ρ, within the bounds

The coolant’s maximum temperature at the boiler outlet is °Ρ, but not higher

The heating system’s coolant operating pressure, expressed in MPa (kgf/sq., should not be higher

MPa (kgf/sq.m.)cm, the water heater’s operating water pressure, is not higher than

The hot water heater’s flow rate at a temperature differential of 35 °¡ is l/hour.

Overall boiler hearth dimensions:

Natural gas nominal pressure, Pa

Allowance behind the boiler, Pa, within bounds

Maximum natural gas pressure, Pa

Heater mass boiler, kg

Inches-long connection threads for the heating medium’s supply and return

Inches of the water heater’s connection thread

Inches of the gas supply fittings’ connecting thread

Suggested chimney parameters:

– area cross-sectional, squared

– boiler hearth’s chimney height, measured in meters

– Hearth diameter of boiler flue, mm

You can apply or send an inquiry to strategia@list, and we will get in touch with you soon.

Gas boilers that are floor-standing

Solid fuel pyrolysis boiler Ochag

There is only one model in this class of water heating equipment that has a 100 kW capacity and can heat 1,000 square meters at a ceiling height of 2,7 meters. Ochag solid fuel boilers are identified by the letters KP on the label. The primary fuel source is firewood, which can have a moisture content of up to 30%. Wood briquettes and scraps can also be utilized as energy sources.

Boilers using solid fuel White is the color of the hearth always.

The firebox of the heater is spacious and can hold logs measuring 75 cm in length. The device can operate for up to eight hours at full load. The heater’s design incorporates a fan and control unit that run off of the main power supply. The heat carrier’s required temperature can be adjusted, and the fan’s intense rotation will keep it there. As the wood is being placed into the firebox, the fan automatically turns off.

Features of the Ochag pyrolysis boiler:

  • The efficiency is only 85%;
  • the volume of water in the unit is 440 liters;
  • the furnace volume is 240 liters.

With the heat transfer medium removed, the heater weighs 1.4 tons. It is put in place on the ground. Given that the diameter of the outlet pipe is 280 mm, a traditional chimney with an internal cross-section of 300 mm is needed. Chimney height minimum: 5 meters. The gas discharge pipe should be insulated in the sections that cross the street and the unheated room to prevent condensate formation.

Universal floor standing boiler Ochag

Natural gas or solid fuel can be used to power universal heaters. Coal, briquettes, and wood can all be used to heat it. This is useful in places where the supply of gas is intermittent. Additionally, these units are installed in situations where the house needs to be heated immediately and there isn’t a central gas pipeline yet, but one should appear soon.

In the line, there are two modifications: KSTG and KSTGS. The color of the housing and the kind of automation that has been installed vary. The KSTG line, which has a fully white casing, is produced using automatic SABKT-ZS-RD and SABKT-ZD. Automatics SABK-8-50S-RD and SABKT-8-50T are fitted to KSTGS models; the white casing has red inserts. Not every universal heater is reliant on the electrical grid.

In actuality, the weather has an impact on the apartment’s battery temperature based on standard procedures. What matters most is that the heating level matches the norm.

It is written about what is thought to be a wintertime normal temperature in the apartment.

Overall technical attributes:

  • the presence of a DHW circuit;
  • Efficiency on solid fuel 73% and on gas 87%;
  • the temperature of the heat carrier is regulated in the range from 50 to 90 degrees Celsius.

Apart from automation, there are differences in the boiler’s coolant volume and furnace size between models KSTG and KSTGS that have the same power. For instance, the furnace in the KSTG 10 kW heater holds 25 liters of coolant, while the KSTGS heater holds 40 liters and 31 liters of coolant, respectively.

A little about the installation of boilers

Installing boilers powered by solid fuel is not an extremely tough task. Essential system specifications:

  • It is necessary to ensure the removal of combustion products, that is, connect the boiler to the chimney.

Advice: The boiler needs to be attached to a chimney consisting of two pipes with a thermally insulating substance positioned in between. To avoid condensation, this is essential. The model’s capacity—a parameter that is detailed in the instructions—determines the height of the chimney.

  • Only water can be used as a heat carrier in the heating system with a solid fuel boiler. Use of other types of heat carrier is excluded.
  • An expansion tank should be installed at the upper point of the system circuit. The use of this type of boilers in closed systems is prohibited.

When installing boilers with an open furnace, it is advised to outfit a different room. It’s usually found in the basement or on the basement floor. The boiler room needs to be furnished in compliance with hygienic and fire safety regulations.

The following guidelines must be followed when installing the boiler:

  • Put the boiler on a solid, level base (most often used concrete screed).
  • Boiler must not be placed close to the wall. The distance from the wall to the rear wall should not be less than half a meter, from the front wall should be separated by a distance of more than 1.25 meters.
  • The floor and walls in the boiler room should be treated with a vapor and gas-tight coating with a fire resistance of at least three quarters of an hour.
  • A hole should be made in the ceiling or wall of the boiler room for the chimney outlet. The inner diameter of the chimney pipe must be equal to the size of the boiler outlet throat.

General information

Solid fuel-powered modern boilers are very different from their "forebears." These days, a boiler is a device that uses the pyrolysis effect to provide longer fuel combustion. This made it possible to dramatically raise fuel technology’s efficiency.

Furthermore, contemporary boilers come fitted with a mechanism to control the combustion intensity and heating power. Because of this, the owners can select the most fuel-efficient temperature mode for their home.

Principle of operation

There are two sections to the boiler:

  • the upper compartment is used for fuel (coal or firewood);
  • the lower compartment is a combustion chamber into which air and gaseous products of pyrolysis reaction, which take place in the upper chamber, are supplied.

Extremely high temperatures are required for fuel combustion, which releases a significant amount of heat and gas from organic fuel.

Our investigation into floor-mounted gas boilers, in particular the 15–71 kW Hearth KChG series, takes us inside a dependable option for home insulation and heating. When it comes to heating larger spaces and maintaining a constant temperature, these boilers provide an effective and compact solution. They are perfect for a variety of home configurations because of their floor-mounted design, which not only saves valuable wall space but also provides sufficient heating power. The Hearth KChG series offers a promising option for new construction or heating system upgrades, as it strikes a balance between functionality and affordability for improved home comfort.

Floor gas boilers Ochag KChG

Heat-producing domestic cast-iron boilers (KCHG) are intended to provide up to 700 m³ of total area and 2.7 m of ceiling height to residential homes. These heating boilers operate automatically on low-pressure natural gas based on the coolant’s temperature.

The following results are obtained when heating systems employ cast iron heat exchangers and cast iron gas boilers:

  • energy saving (gas consumption is reduced up to 30%) due to the built-in gas pressure stabilizer;
  • reduction of harmful emissions into the atmosphere;
  • Increasing the accuracy of temperature regulation in the room.

Home cast iron gas boilers (KCHG) have five levels of safety in case of emergency and operate automatically based on the temperature of the heating system’s coolant:

  • in case of overheating of the heat carrier in the heat exchanger;
  • in case of flame extinguishment on the ignition burner;
  • in the absence of draught;
  • when the gas pressure in the network drops below the minimum permissible value;
  • in case of increased pressure of the heating medium.

These floor-standing cast iron boilers have main burners made of heat-resistant stainless steel with slotted slots and an extremely effective cast iron heat exchanger with a needle convective heating surface. Regardless of the gas pressure in the network, the gas pressure stabilizer integrated into the gas block guarantees consistent heat production and uniform combustion of the gas-air mixture on the main burners without the need for adjustments.

In addition to preventing the ignition burner from blowing out during a brief overturning of the draught, the traction breaker, also known as a draught stabilizer, equalizes the air pressure in the zone of suction into the ejector of the main burners and near the exit of the gas-air mixture from the slots when the main burners are open.

By evenly positioning the main burners beneath the heat exchanger, a uniform heat field is created in the furnace volume, preventing the development of isolated heat exchanger overheating zones and subsequent heat exchanger destruction.

Benefits of KCHG cast iron boilers:

  • Design and small dimensions of the heating boiler allow it to harmoniously fit into any interiors of the room.
  • Modern design and technological developments used in this cast iron boiler allow it to be easily maintained and operated.
  • Complete energy independence of the domestic boiler from external sources of electricity.
  • The ability to operate at reduced (to permissible limits) gas pressure.
  • Increased strength of the heat exchanger excludes mechanical damage to the cast-iron gas boiler when used in closed heating systems (with a membrane expansion tank).
  • To heat water for domestic needs, a boiler is connected to the heating boiler.
  • Does not require adjustment for atmospheric changes.

Choosing a gas boiler Ochag

Consider the heat exchanger’s construction material when making your selection. Notable models composed of:. Steel

This material has good plasticity, meaning there is little chance of it cracking from heat stresses. Steel heat exchangers are typically offered in low-cost models. Its service life is not very long because it is prone to corrosion.

Iron cast. This particular design is heavier and costs more than others. One drawback that can be emphasized is the possibility of a heat exchanger cracking because of temperature variations. Its advantage, though, is that it can function well for 40–50 years and is resistant to corrosion.

Copper. This material resists corrosion and is lightweight. Copper heat exchangers are typically found in wall-mounted execution models.

  1. Steel. This material is characterized by good ductility, the risk of cracking due to thermal stresses is minimized. Usually steel heat exchangers are presented in inexpensive models. Its service life duration can not boast of duration, t.к. is susceptible to corrosion.
  2. Cast iron. Such a design weighs a lot and the price for it is higher than for others. As a disadvantage can be emphasized the fact that due to temperature fluctuations, such a heat exchanger can crack. However, its advantage is that it is not susceptible to corrosion and can successfully serve for 40-50 years.
  3. Medi. This material is lightweight and resistant to corrosion. Most often copper heat exchangers can be found in models of wall-mounted version.

You can find out more about the various kinds of heat exchangers used in gas boilers by

Selecting the ideal heating system for your house is essential for both efficiency and comfort. We have examined the features and advantages of the Hearth KChG floor-mounted gas boilers, which have a power output ranging from 15 to 71 kW, in this article. Larger homes or buildings can be reliably heated with the help of these boilers.

The Hearth KChG boilers’ adaptability in terms of power output is one of their main benefits. Homeowners can choose the right size for their needs in terms of heating and property size, as models ranging from 15 to 71 kW are available. This adaptability guarantees that the boiler can effectively fulfill the requirements of various settings.

Hearth KChG boilers are renowned for their longevity and durability in addition to their diverse power output. These boilers are made to withstand the demanding conditions of continuous use because they are made of premium materials and are engineered for strong performance. Because of its longevity and dependability, homeowners can feel secure in the knowledge that their heating system will function as intended.

Another important consideration when choosing a heating system is efficiency, which benefits the environment and saves money. Because of their energy-efficient design, the Hearth KChG boilers help to minimize energy waste and fuel consumption. These boilers efficiently heat a space while maintaining controllable operating costs by optimizing combustion processes and maximizing heat transfer.

All things considered, the Hearth KChG floor-mounted gas boilers provide a dependable, effective, and adaptable way to heat bigger houses or structures. With a variety of power outputs available, robust construction, and energy-efficient operation, these boilers offer homeowners a cost-effective means of preserving comfort all year round while lowering energy expenses and their environmental effect.

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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