A natural or liquefied gas boiler is considered the most efficient, environmentally friendly, relatively inexpensive and quite convenient equipment for autonomous heating of apartments and country private houses. Of course, all potential owners of gas boilers want to know what financial costs they need to prepare for and whether the chosen option will be cost-effective compared to other heating systems.

In this article:

How to measure flow

Unfortunately, in most articles posted on the Internet, calculation examples do not provide a clear answer to this question, and further confuse the average consumer.

The reason for this is the fact that such calculations are based on the gas boiler that it produces over a certain period of time.

Power is measured in kilowatts (kW/h).

It is much clearer and more common to measure the consumption and cost of natural gas in cubic meters (cubic m/h), and liquefied gas in kilograms (kg/hour). Knowing the gas consumption for a certain period of time and the current gas tariffs, you can easily calculate the approximate cost of heating your home.

Calculation methods with illustrative example

Boiler Zhukovsky AOGV

The amount of gas spent on heating a house depends mainly on the characteristics of the gas boiler and its operating conditions.

Therefore, for calculations you will need to know:

• technical parameters of the boiler;
• its power and efficiency;
• gas consumption specified in the technical passport;
• room area.

Our example will involve a gas boiler AOGV-17.4-3 (JSC Zhukovsky) with a capacity of 17.4 kW with an efficiency of 88%.

Natural gas consumption – 1.87 cubic meters/h, liquefied gas – 1.3 kg/h.

The boiler will heat up to 140 sq. meters of total premises area.

Wherein should be considered that the values ​​indicated in the passport correspond to continuous operation of the boiler at full power, but in fact the boiler operates 12-14 hours a day, so we will divide the calculated values ​​by two.

Tariffs and fuel prices

Let’s assume that the cost of the natural gas tariff is 3.9 rubles. for 1 cubic meter.

The cost of refilling a standard 50-liter cylinder with liquefied gas is 600 rubles. Such a cylinder is usually filled to 80% (42.5 l), which is about 21 kg of propane-butane mixture.

Accordingly, the price of 1 kilogram of liquefied gas will be equal to 600 / 21 = 28.6 rubles (excluding the cost of transporting the cylinder to the gas station and back).

According to the device data sheet

This is the simplest and most approximate method of calculation.

For natural gas the consumption is 1.87 cubic meters/h, hence:

- daily consumption is 24*1.87/2=22.4 cubic meters with a cost of 22.4*3.9=87.5 rubles.

— per month (30 days): 22.4*30=672 cubic meters. at a cost of 672*3.9=2,621 rubles.

— for a year (7 months of the heating season): 7*672=4704 cubic meters at a cost of 4704*3.9=18,345 rubles.

For liquefied gas The boiler consumption is 1.3 kg/h, hence:

— daily consumption is 24*1.3/2=15.6 kg at a cost of 15.6*28.6=446 rubles.

— per month (30 days): 15.6*30=468 kg (22.3 gas cylinders) at a cost of 468*28.6=13,385 rubles.

— for a year (7 months of the heating season): 7*468=3276 kg (156 gas cylinders) at a cost of 3276*28.6=93,694 rubles.

According to the specific heat of combustion of gas

The specific heat of combustion (calorific value) of gas depends on the type of natural fuel and the quality of the mixture. This value can be found in reference books on heating engineering.

For natural gas the lowest value of the specific heat of combustion is 34.02 MJ/cub.m or 9.45 kW/h of thermal energy. With a device efficiency of 88%, this figure will be adjusted to 9.5*0.88=8.3 kW/h.

How much does a gas boiler consume:

- 1/8.3 = 0.12 cubic meters of gas are consumed per hour (per 1 kW of boiler output power), and the total gas consumption in the heating boiler is 17.4 * 0.12 = 2.09 cubic meters.

— per day comes out to 24 * 2.09/2 = 25.1 cubic meters, with a cost of 25.1 * 3.9 = 97.9 rubles.

- per month (30 days) it turns out 25.1 * 30 = 753 cubic meters, with a cost of 753 * 3.9 = 2.937 rubles.

— per year (7 months of the heating season) costs will be 7*753=5271 cubic meters, with a cost of 5271*3.9=20.557 rubles.

For liquefied gas the specific heat of combustion is 50.38 MJ/kg or 13.99 kW/h. With an efficiency of 88%, this figure will be adjusted to 13.99*0.88=12.3 kW/h.

LPG boiler consumption:

— 1/12.3*17.4=1.39 kg is consumed per hour.

— per day it turns out 24 * 1.39/2 = 16.7 kg at a cost of 16.7 * 28.6 = 477.6 rubles.

— per month (30 days): 16.7*30=501 kg (22.9 gas cylinders) at a cost of 501*28.6=14.329 rubles.

— per year (7 months of the heating season): 7*501=3507 kg (167 gas cylinders) at a cost of 3507*28.6=100,300 rubles.

Gas consumption is 20-25% more (add this difference to the final amount).

When comparing the results, it is noticeable that if we calculate by the specific heat of combustion of gas, then the costs and cost of heating are higher. This happens because the minimum value of the specific heat of combustion is taken, which in fact may be higher.

In any case, the cost of heating with natural gas will be approximately 5 times cheaper than heating a room with bottled gas. However, liquefied fuel is still cheaper than autonomous electric heating.

At the same time, one should take into account the possibility of connecting to the gas pipeline and the cost of such a connection, which amounts to a fairly significant amount.

It is also worth noting that such calculations are very rough and approximate, since they do not take into account a number of circumstances that can significantly influence the final amount of expenses. In this case, the amount of calculations can vary significantly up or down.

It is best to entrust an accurate calculation, taking into account all the circumstances, to heating engineering specialists.

How to cut costs

Additional factors affecting gas consumption when heating a home include:

• quality of supplied fuel;
• using the second circuit of the boiler to heat water in the domestic hot water system (gas consumption with intensive use of hot water increases by 20-25%);
• outside air temperature;
• features of the design and installation of the heating system;
• condition of individual elements of the heating system during operation.

As well as the general heat loss of the house, depending on the degree of insulation of the walls, floor and ceiling, the number of windows and doors in the rooms, their size and condition, the presence and design of the ventilation system and other technological openings with access to the outside.

How to reduce gas consumption and reduce heating costs:

1. buy a boiler with the highest possible efficiency (the higher cost of such a device pays off during its long-term operation);
2. use modern turbocharged or condensing boilers;
3. try to reduce heat loss at home due to its high-quality insulation;
4. use modern automation (temperature regulators, sensors, etc.) that allow you to maintain and regulate the required temperature level in the rooms;
5. , which will reduce the operating time of the gas burner;
6. Maintain heating system elements in a timely manner (cleaning chimneys, bleeding air from radiators, etc.);
7. A slight decrease in indoor temperature (by 1-2 degrees), practically unnoticeable to humans, will in total significantly reduce costs for the entire heating season.

These measures allow you to reduce gas consumption by up to 25-30% or more, which will significantly reduce your financial expenses.

When arranging a heating system and choosing an energy source, it is important to find out the future gas consumption for heating a house of 150 m2 or other area. Indeed, in recent years, a clear trend towards an increase in prices for natural gas has been established; the last increase in price by approximately 8.5% occurred recently, on July 1, 2016. This led to a direct increase in heating costs in apartments and cottages with individual heat sources using blue fuel. That is why developers and homeowners who are just choosing a gas boiler should calculate heating costs in advance.

Initial data for calculations

To perform a preliminary calculation, you need to find out the following parameters:

• calorific value (calorific value) of natural gas supplied in your area;
• Efficiency of the boiler that is planned to be installed in a house or apartment.

The calorific value of the fuel is taken based on the value of the lower calorific value of the main gas.

Theoretically, when burning 1 m³ of blue fuel, 9.2 kW of thermal energy is released. In practice, this value differs and, as a rule, to a lesser extent. Due to the same rise in price, some unscrupulous suppliers dilute gas with air, which is why its calorific value can decrease to 7.5-8 kW/m³.

To determine gas consumption for heating a house, it is better to find out the caloric value from the management company, and when this fails, use a reserve figure: 8 kW/m³. If they share with you information about the specific heat of combustion and give you a figure expressed in other units, kcal/h, then you can convert it to Watts by multiplying by a factor of 1.163.

Another important indicator that directly affects fuel consumption is the thermal load on the heating system, which consists of heat losses through the building structures and losses due to heating of ventilation air. The best option is to perform or order an accurate calculation of all heat losses, but in the absence of any other option, you can determine the load using enlarged methods:

1. If the ceiling height does not exceed 3 m, then the heat consumption is assumed to be 0.1 kW per 1 m² of heated area of ​​the building. Thus, for a house of 100 m2 you need about 10 kW of heat, 150 m2 - 15 kW and 200 m2 - 20 kW of heat energy.
2. Apply 40-45 W of heat per 1 m³ of heated room volume. The load is determined by multiplying this value by the volume of all heated rooms.

The efficiency of the heat generator, which affects the efficiency of fuel combustion, is indicated in its technical data sheet. If the unit has not yet been purchased, then you can take the efficiency of gas boilers of various types from the list:

• gas convectors - 86%;
• boilers with an open combustion chamber - 88%;
• heat generators with a closed chamber - 92%;
• condensing boilers - 96%.

Performing Calculations

A preliminary calculation of gas consumption for heating is made using the formula:

V = Q / (q x efficiency / 100).

• q is the caloric content of fuel, the default is 8 kW/m³;
• V is the required main gas flow rate, m³/h;
• Efficiency is the efficiency of fuel combustion by a heat source, expressed in %;
• Q is the heating load of a private house, kW.

As an example, we offer the calculation of gas consumption in a small cottage with an area of ​​150 m² with a heating load of 15 kW. It is planned that the heating task will be performed by a heating unit with a closed combustion chamber (efficiency 92%). The theoretical fuel consumption per 1 hour in the coldest period will be:

During the day, the heat generator will consume 2.04 x 24 = 48.96 m³ (rounded - 49 cubic meters) of natural gas - this is the maximum consumption on the coldest days. But during the heating season, the temperature can fluctuate between 30-40°C (depending on the region of residence), so the average daily gas consumption will be half as much, about 25 cubic meters.

Then, on average, per month a turbocharged boiler uses 25 x 30 = 750 m³ of fuel to heat a house with an area of ​​150 m², located in central Russia. Consumption for cottages of other sizes is calculated in the same way. Based on preliminary calculations, it is possible to carry out measures aimed at reducing consumption even at the construction stage: insulation, selection of more efficient equipment and the use of automatic control devices.

Autonomous heating of private houses with liquefied propane or its mixture with butane has not yet lost its relevance in the Russian Federation, although in recent years it has noticeably increased in price. It is all the more important to calculate the future consumption of this type of fuel for those homeowners who are planning such heating. The same formula is used for the calculation, only instead of the lower calorific value of natural gas, the parameter value for propane is set: 12.5 kW with 1 kg of fuel. The efficiency of heat generators when burning propane remains unchanged.

Below is an example of a calculation for the same building of 150 m², only heated with liquefied fuel. Its consumption will be:

• for 1 hour - 15 / (12.5 x 92 / 100) = 1.3 kg, per day - 31.2 kg;
• on average per day - 31.2 / 2 = 15.6 kg;
• on average per month - 15.6 x 30 = 468 kg.

When calculating the consumption of liquefied gas for heating a house, it is necessary to take into account that fuel is usually sold in volumetric measures: liters and cubic meters, and not by weight. This is how propane is measured when filling cylinders or a gas tank. This means that it is necessary to convert mass into volume, knowing that 1 liter of liquefied gas weighs about 0.53 kg. The result for the example above will be:

468 / 0.53 = 883 liters, or 0.88 m³, propane will have to be burned on average per month for a building with an area of ​​150 m².

Considering that the retail cost of liquefied gas is on average 16 rubles. for 1 liter, heating will cost a considerable amount, about 14 thousand rubles. per month for the same cottage on one and a half hundred square meters. There is reason to think about how best to insulate walls and take other measures aimed at reducing gas consumption.

Many homeowners expect to use fuel not only for heating, but also to provide hot water supply. These are additional costs, they must be calculated, plus it is important to take into account the additional load on the heating equipment.

The thermal power required for hot water supply is easy to calculate. You need to determine the required volume of water per day and use the formula:

Q DHW = cm (t 2 - t 1).

• c is the heat capacity of water, equal to 4.187 kJ/kg °C;
• t 1 — initial water temperature, °C;
• t 2 — final temperature of heated water, °C;
• m is the amount of water consumed, kg.

As a rule, economical heating occurs to a temperature of 55 °C, and this must be substituted into the formula. The initial temperature varies and lies in the range of 4-10 °C. For a day, a family of 4 people requires approximately 80-100 liters for all needs, provided that it is used sparingly. It is not necessary to convert the volume into mass measures, since in the case of water they are almost the same (1 kg = 1 l). It remains to substitute the obtained value of Q DHW into the above formula and determine the additional gas consumption for DHW.

Determining the amount of costs for centralized or autonomous heating of a private house is carried out at the design stage of the building, or before choosing the type of energy carrier or the optimal model of the boiler unit.

What factors are taken into account when calculating gas consumption for heating a house, and how to determine the average consumption based on a simplified methodology without resorting to the services of specialists, we will consider in our article.

Heating a home using natural gas is considered the most popular and convenient today. But due to the rise in price of “blue fuel”, the financial costs of homeowners have increased significantly. Therefore, most zealous owners today are concerned about the average gas consumption for heating a house.

The main parameter when calculating the consumption of fuel spent on is the heat loss of the building.

It’s good if the home owners took care of this during the design process. But in most cases, in practice it turns out that only a small part of homeowners knows the heat losses of their buildings.

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The consumption of the gas mixture directly depends on the efficiency and power of the boiler generator.

No less influential are also:

• climatic conditions of the region;
• design features of the building;
• number and type of windows installed;
• area and height of ceilings in premises;
• thermal conductivity of the building materials used;
• quality of insulation of the external walls of the house.

Keep in mind that the recommended nameplate power of the installed unit demonstrates its maximum capabilities. It will always be slightly higher than the performance indicators of the unit operating in normal mode when heating a particular building.

The power of the installed unit is calculated in strict accordance with current regulatory requirements, taking into account all of the above factors

For example, if the rating is 15 kW, then the system will actually function effectively with a thermal power of about 12 kW. A power reserve of about 20% is recommended by experts in case of accidents and extremely cold winters.

Therefore, when calculating fuel consumption, you should focus specifically on real data, and not be based on maximum values ​​​​calculated for short-term operation in emergency mode.

It is recommended to buy a gas unit with a power reserve of approximately 20% in case of emergencies and cold winters. For example, if the calculated thermal power is 10 kW, then it is recommended to purchase equipment with a nameplate power of 12 kW

Average flow calculator

The nominal gas consumption for the past heating period is not so difficult to calculate. You just need to take meter readings every month. After the end of the season, summarize the monthly readings. Then calculate the arithmetic mean.

If you need to find out the nominal values ​​at the stage of designing a house, or when choosing an effective one, but at the same time, you will have to use formulas.

When arranging autonomous heating for a country cottage or apartment, average parameters are used to determine heat loss

To obtain approximate calculations, the specific heat consumption is determined in two ways:

1. Based on the total volume of heated rooms. Depending on the region, 30-40 W are allocated for heating one cubic meter.
2. According to the overall square footage of the building. The basis is that 100 W of heat is spent to heat each square of room area, the height of the walls in which on average reaches 3 meters. When determining the value, they also focus on the region of residence: for southern latitudes - 80 W/m2, for northern latitudes - 200 W/m2.

The main criterion that must be taken into account when making calculations is the required thermal power to ensure conditions for high-quality heating of premises and replenishment of its heat losses.

The basis for technological calculations is the average proportion at which 1 kW of thermal energy is consumed per 10 square meters of area. But it is worth considering that such an average approach, although convenient, is still not sufficiently capable of reflecting the real conditions of your building, taking into account the climatic region of its location.

Using a simplified calculation method, it is taken as a basis that to heat 10 square meters of a private house, 1 kW of thermal power generated by a generator is required

By correctly calculating the estimated fuel consumption, you can clarify for yourself what measures should be taken to reduce its consumption. As a result, the item of regular payments for consumed “blue fuel” will be reduced.

Mains gas for heating needs

A G20 gas mixture is supplied to private homes from a centralized pipeline. In accordance with the adopted standard DIN EN 437, the minimum specific heat value for the combustion of G 20 fuel is 34.02 MJ/cubic meter.

If a highly efficient condenser boiler is installed, the minimum specific heat value for “blue fuel” category G 20 is 37.78 MJ/cu. meter.

You can order a calculation of the heat losses of a residential building in order to create an “accounting” of seasonal costs and clarify for yourself whether there is a need to do insulation from a design organization

Formula for calculating fuel consumption

To determine gas consumption, taking into account the energy potential inherent in it, a simple formula is used:

V=Q / (Hi x efficiency)

• V– the desired value that determines the gas consumption for generating thermal energy is measured in cubic meters/hour;
• Q– the amount of calculated thermal power expended to heat the building and provide comfortable conditions, measured in W/h;
• Hi– the minimum value of specific heat during fuel combustion;
• Efficiency– efficiency factor of the boiler.

The efficiency of a boiler generator shows the efficiency of using the thermal energy generated during combustion of the gas mixture, which is directly spent on heating the coolant. It is a passport value.

In the passports of modern boiler units, the coefficient is indicated by two parameters: by higher and lower calorific value. Both values ​​are written through the fractional line “Hs/Hi”, for example: 95/87%. To obtain the most reliable calculation, take as a basis the value specified in the “Hi” mode.

The lowest value of the specific heat of combustion of gas is a tabular value, the parameters of which correspond to the accepted standards DIN EN 437

The “Hs” value indicated in the table determines the highest heat value of gas combustion. It is indicated in the table for the reason that the water vapor released during gas combustion is also capable of converting latent thermal energy. If you use this thermal energy wisely, you can increase the total return on the consumed fuel.

The operation of new generation boilers – condenser units – is based on this principle. In them, due to the conversion of steam into an aggregate liquid state, an additional 10% of heat is generated.

In addition to G20 gas, an analogue of the second group, G 25, can also be used for domestic purposes. G 20 gas is extracted from Siberian deposits, and G25 is supplied from Turkmenistan and the Volga region. The difference between them is that G25 emits 15% less heat when burned.

Gas grade G25 is characterized by an increased percentage of nitrogen, due to which its energy potential is 15% lower than its natural analogue G20

You can find out what type of gas “flows” in the pipeline from the gas supply company in your region.

An example of calculating network gas consumption

We propose to consider an example of calculating gas consumption for heating a country cottage, the initial data of which has the following parameters:

• The area of ​​the premises reaches 100 square meters. meters;
• recommended heat unit power – 10 kW;
• The boiler efficiency reaches 95%.

To simplify the calculation, joules are converted to another unit of measurement - kilowatts. So, provided that 1 kW = 3.6 MJ, the calorific value of G 20 gas will be 34.02/3.6 = 9.45 kW.

It is also worth considering that the recommended power of the heat generator, indicated as 10 kW, will only be required to heat rooms under the most unfavorable conditions. In fact, throughout the entire heating season, the number of such unfavorable days will be counted in single units.

With a well-thought-out and equipped heating system, the installed boiler unit will definitely not work around the clock

On the remaining days of the cold season, significantly less power is used to heat the building. Therefore, to obtain correct calculations, as well as to determine the average, and not the peak, consumption of “blue fuel”, the boiler power readings are not 10 kW, but “half” 5 kW.

Substituting the obtained data into the formula, perform the calculations: V = 5/(9.45 x 0.95). It turns out that to heat a cottage with an area of ​​100 square meters, the gas consumption is 0.557 cubic meters per hour.

Having clarified the tariffs for paying for one cubic meter of “blue fuel”, it will not be difficult to calculate material costs for the entire heating period

Based on the data obtained through simple calculations, it is not difficult to calculate gas consumption for the entire heating season, which in mid-latitude regions lasts about 7 months:

• For a day it is 0.557 x 24 = 13.37 m3.
• For a month 13.37 x 30 = 401.1 m3.
• For the heating season lasting 7 months 401.1 x 7 = 2807.4 m 3.

Knowing the price of one cubic meter of “blue fuel”, it will not be difficult to plan both monthly expenses and “accounting” for the entire functioning of the heating system.

Consumption of liquefied propane-butane mixture

Not all owners of country houses have the opportunity to connect to. Then they get out of the situation using liquefied gas. It is stored in pits installed and replenished using the services of certified companies that supply fuel.

Liquefied gas used for domestic purposes is stored in sealed containers and reservoirs - propane-butane cylinders with a volume of 50 liters, or gas holders

If liquefied gas is used to heat a country house, the calculation formula is taken as the basis. The only thing you need to take into account is that the bottled gas is a G30 mixture. In addition, the fuel is in an aggregate state. Therefore, its consumption is calculated in liters or kilograms.

Formula for calculating fuel mixture consumption

A simple calculation will help you estimate the costs of a liquefied propane-butane mixture. The initial construction data is the same: a cottage with an area of ​​100 square meters, and the efficiency of the installed boiler is 95%.

When calculating, it should be taken into account that fifty-liter propane-butane cylinders, for safety reasons, are filled to no more than 85%, which is about 42.5 liters

When performing calculations, we focus on two significant physical characteristics of the liquefied mixture:

• The density of bottled gas is 0.524 kg/l;
• The heat released during the combustion of one kilogram of such a mixture is equal to 45.2 MJ/kg.

To facilitate calculations, the values ​​of heat released, measured in kilograms, are converted into another unit of measurement - liters: 45.2 x 0.524 = 23.68 MJ/l.

After which joules are converted to kilowatts: 23.68/3.6 = 6.58 kW/l. To obtain correct calculations, the same 50% of the recommended power of the unit is taken as a basis, which is 5 kW.

The obtained values ​​are substituted into the formula: V = 5/(6.58 x 0.95). It turns out that the consumption of the G 30 fuel mixture is 0.8 l/h.

An example of calculating liquefied gas consumption

Knowing that on average 0.8 liters of fuel are consumed per one hour of operation of a boiler generator, it will not be difficult to calculate that one standard cylinder with a 42-liter refill will be enough for approximately 52 hours. This is a little more than two days.

For the entire heating period, the consumption of the combustible mixture will be:

• For a day 0.8 x 24 = 19.2 liters;
• For a month 19.2 x 30 = 576 liters;
• For the heating season lasting 7 months 576 x 7 = 4032 liters.

To heat a cottage with an area of ​​100 square meters you will need: 576/42.5 = 13 or 14 cylinders. For the entire seven-month heating season, you will need 4032/42.5 = from 95 to 100 cylinders.

A large volume of fuel, taking into account transportation costs and the creation of conditions for its storage, will not be cheap. But still, in comparison with the same, such a solution to the issue will still be more economical, and therefore preferable.

Ways to reduce consumption

The main reason for significant heat losses, which lead to ineffective consumption of the thermal energy released by the boiler unit, is insufficient insulation of the structural elements of the house. Up to 40% of heat is wasted through “cold bridges”.

Up to 35% of the heat generated by the boiler leaks through windows with poor-quality frames, up to 25% through the walls of the house, and up to 15% through the roof and entrance doors.

In order not to waste money every time heating the street, it is better to spend money once on quality. Believe me, the costs for it will be fully recouped in 3-4 years.

Thermal insulation of a house includes:

1. Insulation of walls. The easiest to implement and affordable option is the installation of polystyrene foam panels. The thickness of the panels is chosen based on the climatic conditions of the construction region, the thickness of the walls of the building and the type of material used in their construction.
2. Insulation of the roof or attic floor. For these purposes, sawdust, mineral wool or polystyrene foam tiles are used. The heat-insulating material, produced in the form of slabs, is mounted on the internal walls of the attic space or placed between the floor beams.
3. Insulation of floors. Not only concrete, but also need good thermal insulation. To form a thermal insulating layer, bulk and slab materials such as expanded clay and expanded polystyrene are used.
4. Replacement of windows. The most reliable shield that prevents the penetration of cold into heated rooms will be PVC windows with high-quality double-glazed windows. They are made for a specific window. Thanks to this, they hermetically close the window opening, reliably protecting household members not only from the “leakage” of heat, but also from the penetration of street noise.

Proper thermal insulation allows you to reduce heat loss to a minimum.

In addition to high-quality insulation, to increase the efficiency of heat transfer, experts recommend using other equally effective measures

Experts include additional measures to increase the efficiency of heat transfer:

• Radiator equipment. Thermal heads will maintain the required comfortable temperature in the rooms.
• In addition to radiators, install convectors with directed circulation function. They will create thermal curtains from heated air in the area of ​​the openings.
• Connecting equipment that allows you to program optimal heating modes. Installing chronometric thermostats is effective if there are rooms in the house that are empty for several days, which there is no point in intensively heating.

The costs of purchasing and installing automation will more than pay off within the first heating season.

Simple ways to reduce gas costs will be discussed in the following video:

The average calculation value will be useful for calculating material costs solely for heating the building. When planning to use gas appliances or a stove during the heating season, the data should be adjusted.

If, after studying the material, you have questions about calculating gas consumption, you can ask them in the block below. In addition, if any inaccuracies were noticed or you would like to supplement the material, please leave your comments.

It is difficult to create comfort and coziness in a home without a traditional heating system. When choosing the appropriate equipment, it is important to know the approximate gas consumption for heating a house of a certain area. Based on these data, it is easy to calculate how much you will have to pay for indoor heating per year.

Blue fuel is supplied centrally or stored in special tanks - cylinders or gas holders. The first option is the most rational and economical, since operating costs for heating with main gas are several times lower. However, old pipes reduce efficiency, and the natural fuel itself is not always of first-class quality, which increases costs. Autonomous heating systems operate on expensive liquefied gas. The cost of 1 liter will increase even more if transport costs for the delivery of cylinders are included.

The main consumption characteristics when heating with liquefied gas depend on the evaporation surface area (the larger it is, the higher the ability of the device to convert liquid into the vapor phase). Horizontally located tanks are considered more profitable. In general, known physical parameters are used for calculations.

The cost of heating with main gas is determined based on the power of the boiler.

Method for calculating gas for heating a house with examples

The financial costs of heating a building using the traditional method depend on many parameters: type of windows, quality of wall insulation, ceiling height, ratio of floor areas to window openings, required temperature and other variable external factors. It is not possible to determine the exact cost value, so the average value is calculated.

With a centralized gas supply, the maximum number of kWh per month is equal to the product of the area of ​​the heated building, the boiler power and the number of hours per month. However, home owners are more interested in how to find out the gas consumption for heating a room over a year. To do this, the duration of the heating season in monthly terms (for Russia on average - 7) is multiplied by the resulting value. Average annual costs are equal to half the total value. Costs for autonomous gas supply (cylinders) are calculated based on the physical characteristics of liquefied gas: calorific value - 23,500 kJ/l; density - 0.52 kg/l; the amount of thermal energy released during the combustion of 1 liter of fuel is 6.53 kWh.

The average cost of filling a 50-liter cylinder is 680 rubles (the cylinder is filled 80%, the container contains 42.5 liters). This means that 1 liter of gas costs 16. With a boiler with an efficiency of 93%, 1 kWh is estimated at 2.63.

1. Calculation for a house of 100 m2

2. Calculation for a house 200 m2

• To keep such a building warm, a boiler with a capacity of 20 kWh is installed. Monthly maximum consumption: 20 x 30 x 24 = 14,400 kWh. Annual costs: 14,400 x 7 = 100,800 kWh. According to the methodology, the average calculation of natural gas for heating a house of 200 m2: 100,800 / 2 = 50,400 kWh. In monetary terms: 50,400 x 0.31 = 15,624 rubles.
• If we are talking about liquefied gas in cylinders, then 36,000 kWh per year is spent to heat the building. With a cost of 1 kWh equal to 2.63 rubles, average annual costs: 36,000 x 2.63 = 94,680.

Ways to reduce the cost of heating your home with gas

1. Maximum blocking of heat loss from the building. Even at the design stage, care should be taken to ensure the compactness of the structure.

2. Installation of modern high-quality equipment.

3. Combining cylinders into a group reduces gas consumption in liters for heating a house, but for cottages with an area of ​​more than 200 m2, liquid fuel is expensive.

4. Use of automatic systems for adjusting the air temperature in the room (reducing heating at night, changing the heat supply, depending on external conditions, maintaining a fixed temperature).

For a home, owners are required to know in advance how much it will cost to heat their living space during operation. Ultimately, it may be that the heating system will simply be unprofitable if the equipment is chosen incorrectly, the design is poorly designed, or the walls are poorly insulated. Therefore, it is important to correctly calculate the gas consumption for heating a house of 200 m2. From the obtained figure you can already start and start or not start designing and purchasing equipment.

We calculate the gas consumption for heating a house of 200 m2

One of the main values ​​in the calculation formula is the power of the equipment. Without it, it is impossible to determine the heating of a 200 m2 house. A boiler is selected based on the area of ​​the house, and when calculating the flow rate, they are guided by the lowest air temperature outside the window. The resulting value is divided in half, because the temperature outside is not always sub-zero. So the consumption will vary in approximately the same proportions.

Determination of boiler power

When calculating the consumption of liquefied gas for heating a house of 200 m2, the boiler power is first determined. It is assumed that for every 10 square meters of heating area, 1 kW of power is needed. Based on the fact that the value needs to be divided in half, we take half - this is 50 watts per hour per square meter. For 100 meters of area we need 5 kW of power; at 200 meters - 10 kW. This means that when choosing a heating boiler, we need to look for models with a power of 12-15 kW. It is recommended to choose equipment with a reserve. If you choose a 10 kW boiler, then it should cope with its task, but if somewhere the heat loss in the house is higher than expected, then the boiler will work at the limit of its capabilities and will not always be able to provide proper heating.

Forum natural gas consumption for heating a 200 m2 house

There is a special formula by which the calculation must be carried out:

In this formula:

1. A is the amount of gas per hour to be determined.
2. Q is the power required for heating (in our case it will be equal to 10 kW).
3. q - minimum specific heat. This parameter depends on the brand of gas used. If your gas pipeline uses G20 gas, then this value will be equal to 34.02 MJ/cubic meter. It must be converted into kilowatts using the formula: 1 MJ = 0.277(7) kWh. It will be equal to 9.45 kWh.
4. B - efficiency of our equipment. The value depends on the boiler you choose. There are models on the market with efficiency ratios of 80%, 90%, 95%, 98%. It is advisable to select a boiler with a higher efficiency. This way, the gas consumption for heating a house of 200 per m2 will be less, and the savings over the year will be significant. For at least a few years, the savings will exceed the costs of the higher cost of a high-efficiency boiler. Let's say you choose a model with 95% efficiency. However, we cannot put percentages in the formula. Therefore, we take the coefficient 0.95 and use it.

We know all the numbers. Now you just need to substitute them into the formula:

A = 10 / 9.45 * 0.95 = 1.0053 cubic meters m/hour.

This means that the average gas consumption for heating a 200 m2 house is 1 cubic meter per hour. But this is provided that you use a boiler with an efficiency of 95%, and your gas pipeline contains G20 gas. Otherwise, the values ​​in the formula need to be changed, the result will be slightly different.

Daily and monthly expenses

Now all we have to do is multiply the resulting figure by 24, and we will get the daily gas consumption under the condition of continuous operation of the equipment. Next, we multiply the value by 30 and get the monthly gas consumption. In our case, the flow rate will be 720 cubic meters. In principle, this is the real gas consumption for heating a house of 200 m2; all you have to do is find out the cost of one cubic meter for your region and calculate how much it will cost.

Calculation of liquefied gas

The above formula will also work for liquefied gas. The only difference is the different thermal conductivity of the gas itself. Therefore, here the parameter q is taken equal to 46 MJ per kilogram or 12.8 kW per kilogram. Let's leave the boiler efficiency equal to 95. Substitute the values ​​into the formula and get:

A = 10 / 12.8 * 0.95 = 0.74 kg/hour.

Liquefied gas is always counted in kilograms. The value is then converted to liters. To do this, the resulting value must be divided by 0.54. In our case, the consumption is 1.37 liters of gas per hour. Next, according to the usual scheme:

1. The daily consumption of liquefied gas will be 33 liters.
2. Monthly consumption is almost a thousand liters.

It is worth considering that a standard cylinder contains only 42 liters. This bottle lasts for about a day. To understand how many cylinders we need, simply divide the amount of gas per season by 42. Next, knowing the cost of a cylinder of liquefied gas, you can calculate how much it will cost to heat a house.

However, it is not necessary to buy cylinders. You can use a gas holder. Gas consumption for heating a house of 200 m2 in this case will not differ. Simply pumping a large volume of gas into a gas tank for a whole season at once will be more profitable than buying a large number of cylinders.

Reducing consumption

This is known: if you insulate your house well, the fuel consumption for heating will be significantly reduced. Therefore, before selecting and installing equipment and laying main routes, it is necessary to properly insulate the house: walls, roof and attic, floor, replace windows, and make an airtight sealing loop on the doors.

Particular attention should be paid to the roof and windows. It is assumed that out of 100% of lost heat, 35% goes through the roof, about 25% is lost at the windows. Therefore, use the best thermal insulation materials and good double-glazed windows, which have a low thermal conductivity coefficient. Cheap double-glazed windows are immediately obvious: their aluminum or steel “skeleton” is always very cold in winter, and a lot of heat is lost directly through it. Even the glass itself does not transmit heat as much as the metal profile on which the glass is held does.

Warm floor or conventional radiators

Also, the correct heating design plays an important role. It is estimated that a well-designed and implemented heated floor will reduce gas consumption. Conventional radiators would require more gas to heat indoor air to the same level. This is due to the fact that thanks to a warm floor, heat rises from bottom to top and spreads throughout the entire area of ​​the room. But conventional batteries heat the outer wall, which is why their efficiency is lower.

Also, the floor temperature standard is 50 degrees, radiator temperature is 90 degrees. Obviously, the floors will be more efficient and economical. Yes, the project and installation of flooring will cost more, but the difference in price will pay off very quickly.

We use modern automation

Well, and the obvious things: you can save gas by correctly setting the heating time. For example, if you are away from home from morning to evening, then in the boiler (if it supports such a function) you can set the thermostat to a low temperature and program an increase in power at a certain time. And if you are away from home for weeks or even months, then ideally you need to set the coolant temperature to 3-5 degrees. And let it be cold in the house. The main thing is that the pipes do not freeze.

Modern technologies have gone far ahead in this regard. Many boilers can be equipped with modern automation, which allows you to control the device remotely. You can command the boiler to change mode from your smartphone while at work. For this purpose, special GSM modules are installed on the equipment. And there are many similar smart systems. If used correctly, actual heating costs can be reduced. Sometimes savings can reach 30, 40 and even 50%. Of course, this depends on how often you are at home and what the temperature is outside.