Heating systems using gas as fuel are highly efficient and reliable. Generators of thermal energy in them have impressive efficiency, are safe to operate. There are several ways to arrange gas heating for a private house.
There are solutions both budgetary in execution, and more expensive with maximum efficiency and stability in work. We are ready to share with you proven in practice options for installing a gas heating system. The use of our recommendations ensures the construction of a reliable and reliable network.
The information we provide is based on building codes. The information offered for acquaintance supplements visual photo-illustrations, diagrams and video manuals.
Centralized or autonomous gas supply?
Without combustible fuel, there will be zero value from any version of the home heating system in an autonomous execution. Gas is the first thing you need to think about when planning gas heating in a country house.
Not all settlements in Russia are gasified. However, “blue fuel” can be obtained not only from a pipe or cylinder with liquefied fuel, but also from a gas tank.
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Gas is the most affordable type of fuel, especially if it is possible to connect to a centralized gas supply
A significant minus of the use of gas is its toxicity and ability to explode in violation of operating rules
Centralized gas supply networks transport natural gas or its artificial analogue obtained as a result of processing at the plants of oil, peat, coal, etc.
In cities, gas is transported through medium-pressure networks, from where it is supplied to regulatory stations, which reduce pressure to low values suitable for delivery to household appliances
In small towns and smaller towns, low-pressure networks are being built to supply low-calorie and medium-calorific blue fuel
Gas pipelines are laid underground, deepening them below the level of seasonal freezing of soil layers. Overhead laying is allowed at the intersection of rivers, highways, ravines and similar obstacles
At the entrance to a private building, as well as a microdistrict or village, a disconnecting device is installed. They are placed on each branch of the pipeline and before the pipeline crossings through obstacles
The gas pipeline’s internal wiring is made of water and gas pipes regulated by GOST 3262-75. They are painted twice with oil paint to protect against corrosion.
Connecting the house to the central gas supply
Private house gasified
Main gas pipeline
Gas pressure regulating station
Gas network of a small village
Lay gas pipeline according to the rules
Shut-off valve at the entrance to a private house
Protective painting of gas pipelines
Natural gas, consisting mainly of methane, is piped to private homes. Its liquefied analogue is a propane-butane mixture, which is pumped into containers for transportation and storage. The pressure in such cylinders and gas holders is about 15-18 atmospheres.
When organizing heating in a private house using balloon containers of 50 liters, the latter will have to be changed every 2-3 days in winter. If autonomous gas supply is chosen for a country cottage, it is best to prefer a gas holder, which can be up to 20 cubic meters in volume.
The choice of capacity per cubic meter depends on the level of consumption of liquefied petroleum gases (LPG). Here it is necessary to take into account not only the hot water boiler, but also the fireplace and gas stove, if they are used in the house.
For a cottage of 150 sq.m. It is recommended to install a gas tank with a volume of 2000–3000 liters. And for a country house of 300 sq.m. you will need an option for 8000–9000 liters.
If there is no gas main in the village, you can use the option of autonomous fuel supply from a gas tank designed to store gas in a liquefied state
According to the cost of connection, a gas pipeline is in most cases more advantageous than a reservoir in the ground. But only when the locality is already gasified.
There are also possible situations in which the installation of a gas holder will cost less than connecting to a main pipeline. It all depends on the specific connection conditions in the region and the remoteness of the village from the large gas pipeline.
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Domestic LPG installations
Location of a group of gas cylinders
Gas tank for injecting liquefied gas
When using a gas holder, you don’t have to worry about the pressure in the pipe. It is extremely easy to operate. It is only necessary to regularly call specialists to check it for safety, and also do not forget to refuel. Installation of the entire system will take no more than three days.
If you choose an autonomous version of gasification, then the gas boiler should be purchased one that is designed to work on LPG. There are models on sale that are designed to operate solely on main natural gas.
But most gas heat generators are adapted to burn both types of this fuel. You only have to change the nozzles, as well as reconfigure the valve and electronics to a different mode.
The main disadvantage of a gas tank is that it can be installed only on a large area, the capacity according to the requirements of SNiPs must be removed from the house by at least 10 m
The rules and specifics of gasification of country houses are described in detail in one of the popular articles on our site.
Choosing a heating gas boiler
Modern gas-fired heat-generating equipment has a variety of automation and is able to work in several modes. It can be floor and wall.
The second option is more compact, but has power limitations. If the model is selected for a large private house, you will have to purchase a powerful unit in the floor.
Gas boilers are divided by the method of execution, type of ignition, energy efficiency, the number of circuits and the method of removal of combustion products
The principle of functioning of a gas boiler is extremely simple - the fuel is ignited in the burner using piezoelectric elements or electronic ignition, then as a result of burning fuel, thermal energy is generated, which is transferred to the water through a heat exchanger.
The latter is already used as a coolant in the heating system or is consumed in domestic hot water.
In terms of overall performance, traditional convection gas boilers lose condensation. The performance of the former does not exceed 90% of energy consumption. Manufacturers of the second guarantee an efficiency of 100%, in some models 105 and even 110% are promised
The heat exchanger in a gas boiler can be made:
- from steel (stainless steel);
- copper;
- cast iron.
The most common options are steel. This metal is cheap and ductile, so cracks from constant heating / cooling appear less often in it.
But steel elements, when they constantly interact with the water of a gas heating system, arranged in a country house, quickly begin to corrode.
Cast iron heat exchanger is the most durable, steel is cheaper, and copper is most effective in capturing heat transfer to water
Cast iron is less susceptible to corrosion, but it is quite heavy. Most boiler models with cast-iron heat exchangers are floor standing. It is problematic to mount such heavy and overall equipment on the wall.
If you need a compact and lightweight heating unit, the best option is with a copper coil. However, it costs the most among analogues of other metals.
To supply the cottage with heat and hot water, you can choose a scheme with two single-circuit boilers or an option with one double-circuit installation
The piping scheme and the principle of its use depend on the number of circuits in the gas-fired water boiler. One heat exchanger was originally designed to organize a gas heating system in a private house. For hot water supply, it is necessary to install another boiler or immediately select a dual-circuit model.
It is best to heat hot water for domestic use in a storage boiler. Streaming models are less economical. They will spend more gas on heating.
Wall-mounted gas boilers are a fully equipped miniature boiler room. Their design has its own circulation pump, expansion tank and safety group. Most types of wall equipment serve two circuits.
Which combustion chamber is better?
In order for the gas in the furnace to burn, it needs a constant supply of oxygen. It is taken directly from the boiler room or pulled from the street. The first option involves a natural flow of air, and the second is forced by a fan.
Gas boilers are equipped with two types of combustion chambers:
- Closed - oxygen replenishment is carried out through the gap between the paired pipes of different diameters. The combustion products are discharged through the internal channel.
- Open - air enters the furnace from the room with the heating unit through the supply valve. The combustion products are removed round in cross section by a smoke channel.
The first option is independent of the area of the room. Suitable for rooms of any size. The coaxial view of the chimney from the unit with a closed firebox can be displayed through a wall or an upper ceiling with a roof.
In the second case, it will be necessary to install a chimney high at 5–6 meters, otherwise the draft for suction of the required volumes of oxygen into the combustion chamber will not be enough.
But gas boilers with an atmospheric burner do not need to be connected to the mains. There is no fan in them; everything happens naturally without forced circulation.
Boilers with closed chambers and forced air discharge have higher efficiency compared to open boilers, but they require constant power supply to operate
It is recommended that gas water heaters with an open firebox be installed in special rooms with good ventilation. If you mount them in living rooms, they will greatly reduce the amount of oxygen in them.
Without a forced ventilation system there will no longer be enough. And this is an additional cost for the installation and subsequent operation of equipment for air ventilation.
Characterization of condensation models
In conventional gas boilers, water vapor generated by the combustion of gas flies into the chimney. In the process of burning it forms a little, but it still carries a fairly significant amount of thermal energy. In order not to waste this heat, condensing boilers have been developed.
The flue gases in the condensing boiler pass through a secondary heat exchanger before entering the chimney, where they cool the cold water entering the unit
The principle of operation of these units is based on the fact that when cooling the exhaust gas vapor, it transfers heat to the water from the return of the heating system. The temperature of the coolant increases slightly, but the recuperator is quite suitable as an additional source of thermal energy.
Condensed water from the condensing boiler is discharged through a special pipe into the sewer or a separate tank. It is worthwhile to clearly clarify one nuance - the condensate formed is actually a weakly concentrated acid. And in an hour it can leak up to 4-6 liters.
If this liquid is poured into a septic tank, then all the microbes living in it will be destroyed. If there is a treatment station in a country house, condensate cannot be drained from the boiler into the sewer system. With the design of the chimney, everything is simpler, just take one that is designed for boilers with a closed chamber.
Fireplace for gas heating at home
At the cost of equipment, gas fireplaces are comparable to electric or wood counterparts. But gas fuel is much cheaper.
And, unlike firewood, gas heating with a fireplace in a country house involves the absence of problems with ash. Plus, you do not have to constantly monitor the operation of the furnace and take care of chopping logs.
Fireplaces that process gas into thermal energy are used in heating systems, as not equipped with devices necessary for servicing two circuits
By type of installation, gas fireplaces are:
- near the wall;
- island
- recessed.
According to the general design and internal filling (burners, automation, device of combustion chambers) they completely repeat gas boilers. In both cases, the technology for connecting to networks is identical. Differences exist only in the principle of space heating.
By the principle of connecting and organizing a heating system, gas fireplaces are similar to floor heating boilers
The hot water boiler is originally designed to heat water, and a conventional fireplace is used for convection of air from the body and front screen, behind which the fuel burns.
Water heating schemes
For heating cottages, heating systems with water as a coolant are equipped, consisting of:
- boiler water heating (single-circuit or double-circuit);
- piping and fittings (metal or polypropylene);
- bypassallowing disconnecting individual heaters from the network;
- of batteries (cast iron, aluminum, steel and bimetal);
- expansion tank.
Gas heating units are equipped with a specific security system, including an electromagnetic valve and a thermocouple. Devices are interconnected by wires.
If the heating unit is functioning properly, the thermocouple junction is heated by the igniter. At this time, a current flows freely through the solenoid winding, which ensures the valve is open.
When the thermocouple cools down, gas access is blocked by an electromagnetic valve.
According to the battery connection scheme, they are single-tube and two-tube. In the first case, water is supplied and discharged from the radiator using a single pipe. In the second, the heater is connected to two separate pipelines (supply and return).
Heating pipes to the batteries can be connected in the lower, upper, lateral and diagonal patterns
Heating circuits according to the principle of movement of water in the pipes are with natural and forced circulation. With the device of the second option, the coolant circulates in the system due to convection and gravity. A forced circuit involves the installation of a circulation pump.
To ensure the normal operation of the system with two or more circuits connected to the collector, it provides for the installation of a hydraulic arrow. The hydraulic needle eliminates pressure drops and the likelihood of a water hammer.
The expansion tank can be open and closed (internally divided into two parts by a sealed membrane). For gravity heating systems, an open option will suffice. The closed tank is intended for circuits with forced circulation.
When using an open expansion tank, water is saturated with air so that this does not become a problem, the system should be supplemented with a removal circuit
For small cottages, the natural principle of water movement will suffice. However, if a residential building has two or three floors, then you can not do without a pump. The length of the circulation circuit in the first circuit is limited to 30 meters. The boiler will not be able to “push” water over a greater distance.
With natural circulation of the coolant in the gas heating circuit of a private house, there is no pump. If the boiler is non-volatile, then the entire heating system is obtained independent of the power supply. There are simply no elements that consume electricity.
On the one hand, it is more stable in operation, but on the other hand, the quality of heating in it is lower (the water reaches the cooler from the radiators farthest from the water heater).
Especially the latter applies to pipelines and batteries made of steel or cast iron. These materials have high hydraulic resistance, which reduces the coolant current.
In addition to using standard radiators in a country house, it is possible to organize gas heating using a “warm floor”
A variant of organizing a combined heating system is also possible. In it, the circulation pump is connected to the line through the bypass. If necessary, quickly warm the air in the rooms, it turns on to accelerate the water circuit.
And in other cases, it is cut off from the main pipe by shut-off valves, while the system continues to function in a natural (gravitational) mode.
Rules for the arrangement of gas heating
Gasification and building a gas-based heating system in a private house is carried out in several stages:
- Preparation and subsequent approval by the regulatory authorities of a gas heating project.
- Purchase of consumables, boiler and other equipment.
- Connecting the house to the village gas networks.
- Installation of gas equipment and piping systems with batteries.
- Filling pipes with coolant.
- Functional test by trial run.
It is impossible to independently prepare for your country house a gas heating project with all the schemes and calculations without a diploma in heat engineering.
In addition, the generated documentation still needs to be agreed with the gas industry. It is best to entrust all these procedures to the employees of the corresponding design and installation organization.
The arrangement scheme in a private house of gas heating should be calculated to the smallest detail. If the boiler is chosen too powerful, it will burn excess fuel. And with insufficient capacity, the unit will have to work at the limit of capabilities, as a result of which it will fail prematurely.
To obtain permission to connect to a centralized highway and to use equipment for liquefied gas, you need to get a different package of documents. Before deciding on the organization of a gas system, you need to study not only them, but also weigh the pros and cons to determine the best option.
Clip # 1. The nuances of organizing a gas heating cottage:
Clip # 2. The principles of coolant circulation in the heating system of a private house:
Clip # 3. Self-assembly of various heating systems for country cottages:
Only an experienced heating engineer is competent to prepare calculations and schemes for organizing gas heating for a private house.
The preparation of project documentation and its coordination is best entrusted to professionals. But the further installation of the heating system can be done independently. Here you will only need installation skills, as well as strict adherence to instructions and the project.
Do you have any useful tips on organizing gas heating and choosing a gas boiler? Do you want to share your own experience or have you discovered controversial issues while familiarizing yourself with the material presented by us? Please write comments and ask questions in the block below the text.