Electricity consumption of a gas boiler: how much electricity is needed to operate standard equipment

Calculation of the main indicators for the boiler

The main link of the independent heating complex is a boiler unit or a heat generator. Depending on a number of certain factors (location of the house to a nearby fuel source, living conditions at different times of the year, installation price, building dimensions), it is necessary to choose the right equipment. However, the key criterion among all these factors is precisely the heat engineering calculation, since the future power of the system and the type of fuel used will depend on its results. Owners of living space up to 300 m² prefer to install an electric heating boiler, who seek to quickly and efficiently establish heating. This compact electric heater can be installed in any accessible location where there is a 220V (380V) mains connection. The complex can function independently or act as an auxiliary source of heat in a workable heating system, as long as necessary.
Factors affecting electricity consumption
Before proceeding with the calculations, it is imperative to study the structure of the electric boiler, at least in its general terms. In order to perform all the necessary calculations correctly and understand which boiler will be the most efficient and optimal solution in your particular case, it is worth considering a number of indicators:

Scheme of an electric boiler.

• type of equipment available (single-, double-circuit);
• volume of the tank;
• how much coolant is contained in the heating circuit;
• heating area;
• supply voltage and current value;
• unit power;
• sectional area of ​​the power cable;
• operating time of the installation during the heating season;
• the average value of the duration of operation in the maximum mode per day;
• price 1 kW/h.

Despite the fact that a conventional boiler does not imply special requirements, the use of a unit with a power of more than 10 kW must be coordinated with the authorities distributing electricity and Energy Supervision. The reason for this is the connection of a fairly powerful three-phase line. In addition, it is worth obtaining consent to the use of a household tariff for paying

It is important to understand that averaged values ​​​​are taken as average calculations, and therefore it is imperative to introduce an amendment for air temperature, materials and wall thickness, the type of thermal insulation used, etc.

The electric model is considered the most comfortable, profitable and economical due to the cost of purchasing a boiler unit, its installation and maintenance. It is also important that for the production of green energy it is not necessary to allocate a separate room for boiler equipment and spend money on creating a chimney.

How to calculate how much electricity an electric heating boiler consumes

It is impossible to determine the exact consumption of an electric boiler, since it depends both on weather conditions, the location and parameters of the house, and on operating conditions, the functionality of automation.

Nevertheless, it is quite simple to calculate an approximate indicator and present an approximate amount payable for heating a private house with an electric boiler.

At the same time, not everyone knows that electricity consumption can be reduced by 10, 30, and sometimes even 50% by resorting to small, quick payback costs, which are described in detail in this article.

We calculate how much electricity an electric boiler consumes per hour, day and month

Almost all modern electric boilers have an efficiency of 99% or more. This means that at maximum load, a 12 kW electric boiler will consume 12.12 kW of electricity. Electric boiler with a heat output of 9 kW - 9.091 kW of electricity per hour. In total, the maximum possible consumption of a boiler with a power of 9 kW:

1. Per day - 24 (hours) * 9.091 (kW) = 218.2 kW. In value terms, at the current tariff for the Moscow Region at the end of 2019 - 218.2 (kW) * 5.56 (rubles per 1 kWh) = 1,213.2 rubles / day.
2. In a month, the electric boiler consumes - 30 (days) * 2.18.2 (kW) = 6,546 kW. In value terms - 36,395.8 rubles / month.
3. For the heating season (suppose, from October 15 to March 31) - 136 (days) * 218.2 (kW) \u003d 29,675.2 kW. In value terms - 164,994.1 rubles / season.

However, a well-chosen boiler unit never operates at maximum load 24/7.

On average, during the heating season, the electric boiler consumes about 40-70% of the maximum power, that is, it works only 9-16 hours a day.

So, in practice, in an average brick house of 70-80 m2 in the climatic zone of the Moscow region, the same boiler with a capacity of 9 kW requires an expense of 13-16 thousand rubles per month.

Consumption based on the parameters of the house

A visual representation of the heat loss of a private house.

It is possible to more accurately assume the possible power consumption of an electric boiler by knowing the parameters of the house and its heat losses (also measured in kW).

To maintain a comfortable temperature, heating equipment must replenish the heat loss of the house.

This means that the heat output of the boiler = the heat loss of the house, and since the efficiency of electric boilers is 99% or more, then, roughly, the heat output of the electric boiler is also equal to the consumption of electricity. That is, the heat loss of the house roughly reflects the consumption of the electric boiler.

Heat loss of typical residential buildings with an area of ​​100 m2
Coating type and thickness	Average heat loss, kW (per hour)	Peak heat loss at -25°С, kW (per hour)
Frame insulated with mineral wool (150 mm)	3,4	6,3
Foam block D500 (400 mm)	3,7	6,9
House according to SNiP Mos. region	4	7,5
Foam concrete D800 (400 mm)	5,5	10,2
Hollow brick (600 mm)	6	11
Log (220 mm)	6,5	11,9
Beam (150 mm)	6,7	12,1
Frame insulated with mineral wool (50 mm)	9,1	17,3
Reinforced concrete (600 mm)	14	25,5

Initial data

First, a few general remarks to help you understand the proposed schemes:

Part of the time the boiler is idle or operates at reduced power. Its rated power is matched to peak power consumption at home during the coldest days of winter. When the thermometer creeps up, the need for heat decreases;

During the thaw, the need for heat in the house decreases.

To reduce non-target heat losses, the boiler heat exchanger is insulated with mineral wool or teplofol (foil insulation based on heat-resistant foamed polymer).

Having heated the water to the desired temperature, the boiler turns off the heating and waits for the coolant to cool.

Choosing the power of heating equipment

Knowing the required power of an electric boiler for heating a house, one should not forget that its permissible total value for a building is limited by the relevant district services serving the power grid. In case of exceeding the set value, a limiting machine is activated, disconnecting the premises from the power supply.

Thus, when choosing equipment of a certain model, first of all, they find out how large the power consumption of the electric boiler is and then they calculate all the necessary parameters of the device.

Currently, manufacturers of heating units produce electric boilers not only with a fixed power, but also with a simulated one. Experts recommend giving preference to models with a constant value, which allows you to prevent power outages when the limits are exceeded, which occurs when using devices with a simulated indicator.

The amount of electricity consumed does not depend on the type of unit chosen. This value is affected by the amount of energy received by the heating system from the electric boiler.

How to choose the most economical model?

Of the three existing models of electric boilers, cathode and heating elements are most widely used. Of these, ionic ones are considered the most economical. Their efficiency reaches 98%, so the use of such models in a two-pipe heating system will give an economic effect of at least 35%, in comparison with other electric devices.

Achieving such results is possible not only because of the method of energy transfer, but also the whole principle of operation of the device. In a heating system that is set up correctly, the cathode unit starts up with less than 50% power.

Experts recommend choosing just such a model of an electric boiler for a private house.

Ways to determine the consumption of electricity by household appliances and tools

The average electricity consumption in citizens' apartments per month is the sum of the total electricity consumption by all electrical appliances used by its residents. Knowing the electricity consumption for each of them will give an understanding of how rationally they are used. Changing the mode of operation can provide significant energy savings.

The total amount of electricity consumed per month in an apartment or house is recorded by a meter. There are several ways to get data for individual devices.

A practical way to calculate electricity consumption by the power of an electrical appliance

The average daily electricity consumption of any household appliances is calculated by the formula, it is enough to recall the main characteristics of electrical appliances. These are three parameters - current, power and voltage. Current is expressed in amperes (A), power - in watts (W) or kilowatts (kW), voltage - in volts (V). From a school physics course, we recall how electricity is measured - this is a kilowatt-hour, it means the amount of electricity consumed per hour.
All household appliances are equipped with labels on the cable or on the device itself, which indicate the input voltage and current consumption (for example, 220 V 1 A). The same data must be present in the product passport. The power consumption of the device is calculated by current and voltage - P \u003d U × I, where

• P - power (W)
• U - voltage (V)
• I - current (A).

We substitute the numerical values ​​\u200b\u200band get 220 V × 1 A \u003d 220 W.

Further, knowing the power of the device, we calculate its energy consumption per unit of time. For example, a conventional liter electric kettle has a power of 1600 watts. On average, he works 30 minutes a day, that is, ½ hour. We multiply the power by the operating time and get:

1600 W×1/2 hour=800 W/h, or 0.8 kW/h.

To calculate the costs in monetary terms, we multiply the resulting figure by the tariff, for example, 4 rubles per kWh:

0.8 kW / h × 4 rubles = 3.2 rubles. Calculation of the average fee per month - 3.2 rubles * 30 days = 90.6 rubles.

In this way, calculations are made for each electrical appliance in the house.

Calculating electricity consumption with a wattmeter

The calculations will give you an approximate result. It is much more reliable to use a household wattmeter, or an energy meter - a device that measures the exact amount of energy consumed by any household device.

digital wattmeter

Its functions:

• measurement of power consumption at the moment and for a certain period of time;
• measurement of current and voltage;
• calculation of the cost of electricity consumed according to the tariffs laid down by you.

The wattmeter is inserted into the outlet, the device that you are going to test is connected to it. The power consumption parameters are shown on the display.

To measure the current strength and determine the power consumed by a household appliance without turning it off from the network, current clamps allow. Any device (regardless of the manufacturer and modification) consists of a magnetic circuit with a movable disconnecting bracket, a display, a voltage range switch and a button for fixing readings.

Measurement order:

1. Set the desired measurement range.
2. Open the magnetic circuit by pressing the bracket, put it behind the wire of the device under test and close it. The magnetic circuit must be located perpendicular to the power wire.
3. Take readings from the screen.

If a multi-core cable is placed in the magnetic circuit, then zero will be displayed on the display. This is because the magnetic fields of two conductors with the same current cancel each other out.To obtain the desired values, the measurement is carried out on only one wire. It is convenient to measure the consumed energy through an extension adapter, where the cable is divided into separate cores.

Determination of energy consumption by electricity meter

A meter is another easy way to determine the power of a home appliance.

How to count light by counter:

1. Turn off everything that runs on electricity in the apartment.
2. Record your readings.
3. Turn on the desired device for 1 hour.
4. Turn it off, subtract the previous readings from the received numbers.

The resulting number will be an indicator of the electricity consumption of a separate device.

The simplest calculation of planned costs

Theoretical background

Electricity, the only one of its kind, is able to give 100% efficiency when converted into a thermal component. This indicator remains stable for the entire period of operation of the equipment.

Finding out how much electricity an electric boiler consumes is not difficult if you are guided by generally accepted data:

1. 1. In order to heat a unit volume of a building with a heat generator, it will take, on average, 4-8 W / h of electrical energy consumption. The specific figure depends on the result of calculating the heat losses of the entire structure and their specific value for the heating season. They are performed using a coefficient that takes into account additional losses through parts of the walls of the house, through pipelines passing in unheated rooms.
   2. In calculations, the duration of the heating season is 7 months.
   3. When determining the average power indicator, they are guided by the rule: in order to heat 10 sq.m. areas with well-insulated structures, up to 3 meters in height, 1 kW is enough. Then, for example, to warm up a house of 180 square meters.enough boiler power 18 kW. At the same time, it should be remembered that the lack of "capacities" will not allow achieving the required microclimate parameters, and their excess will lead to unnecessary waste of energy.
   4. The calculation of the monthly heat value of an average building will be the product of the boiler power and the number of hours of its operation per day (with continuous operation).
   5. The resulting value is divided in half, taking into account that at a constant maximum load, the boiler will not work for all 7 months: the period of thaws, a decrease in heating at night, etc. are excluded. The result obtained is considered an average indicator of energy consumption per month.
   6. Multiplying it by the time of the heating season (7 months), we get the total energy consumption for the heating year.

Based on the cost of one unit of power, the total needs for heating the house are calculated.

A clear graphical example of the operation of an electric boiler: the dependence of electricity consumption on the temperature outside the window

Using the power formula

In a simplified version, the heat engineering calculation of power can be performed using the formula:

W \u003d S x W beats / 10 sq.m.

It can be seen from the equation that the desired value is the product of the specific power per 10 m, sq. and heated area.

How to calculate boiler power

A number of factors depend on the final capacity of the installation. On average, ceilings up to 3 meters high are accepted. In this case, the calculation is reduced to a ratio of 1 kW per 10 m2, in a climate typical of the middle lanes. However, for an accurate calculation, consider the following number of factors:

• the condition of windows, doors and floors, the presence of cracks on them;
• What are the walls made of?
• the presence of additional insulation;
• how the house is illuminated by the sun;
• climatic conditions;

If your room is blowing from all the cracks, then even 3 kW per 10 m2 may not be enough for you. The path to energy saving lies in the use of high-quality materials and compliance with all construction technologies.

You should not take a boiler with a large margin, this will lead to high electricity consumption and financial costs. The margin must be 10% or 20%.

The principle of operation also affects the final power. Look at the comparison table, it will surely help you:

The minimum required power of an electric boiler for heating a house with an area of ​​150 m2

Classic electric heating elements have compact dimensions and a minimum of communications around; they can be installed in any room. If the house is average (standard masonry of 2 bricks, no insulation, ceilings up to 2.7 m, the climatic zone of the Moscow region), the minimum required power of heating equipment is calculated quite simply: 1 kW for every 10 sq m of heated area. We also recommend setting a power reserve of 15-25%.

Of course, the conditions are always individual, and if the house is located in the extreme northern or southern part of the country, is well insulated, has high ceilings or a non-standard large glazing area, it is necessary to make accurate calculations, taking into account correction factors. You can generate them using the calculator below.

Calculator for accurate calculations

The thermal power of the electric boiler must provide the total power of the radiators, which in turn is calculated based on the heat loss of each room separately.Therefore, find the values ​​\u200b\u200bfor each heated room and add them up, this will be the minimum required electric boiler power for the entire heated area of ​​your house.

How many watts does a circulation pump consume for heating?

The pump is the main element of the heating system. the task of the device is to provide forced circulation of water in a closed circuit.

The operation of the pump allows you to speed up the movement of the coolant in the system and make the process of circulation of the liquid medium more productive. There are different types of equipment, regardless of their type, the efficiency of the process is achieved.

But the question arises, what is the power consumption of the pump, how to calculate it, what to do so that the electricity consumption is moderate.

How many watts does a circulation pump consume for heating

In the 98th year of the last century, a scale was developed, with the help of which today, when producing devices, they are tested at optimal capacities. As a result, all devices receive one or another energy consumption class - from A to G. But today the scale is gradually changing. There is not only class A, but also class A +++. The pumps are class A so far. This is their best indicator.

To date, the most common pumps for heating systems are:

• wet rotor
• dry rotor

Glandless circulation pumps

If you live outside the city in a cottage, then you do not need to tell how much energy is spent on heating the house.

Today is the time to talk about circulation pumps for heating systems that have a wet rotor. The pump body is made of cast iron and the shaft is made of stainless steel.

Pumps can pump water at temperatures from 5 degrees to 110.With the help of improvements in electronics and hydraulics, the pumps consume a minimum of energy.

The device of circulation pumps

The pressure in the system is regulated by an automatic system. Depending on what needs the heating system dictates, signals are sent to the pump, and it changes the rotation speed. All automation is designed to optimize the operation of devices so that they consume a minimum of energy with maximum efficiency in operation.

Grundfos Alpha 2 is the latest technology. The pump is used both in one-pipe and two-pipe heating systems. Power consumption ranges from 5 to 22 watts.

There are also more powerful pumps - up to 60 watts. The permanent magnet rotor reduces energy consumption in Grundfos Alpha2 pumps. The pump has a system that analyzes the state of the coolant.

As a result, the pump optimizes itself.

Stratos Pico is a pump made in Germany by Wilo. It appeared on our market relatively recently. Power consumption - 20 watts per hour. With the help of a digital display, all information about the operation of the pump and the system is displayed in numbers.

Heating pump. We install correctly

There are many types of wet rotor circulation pumps that can be used in heating systems, including the "warm floor" system. Some people think that the circulation pump is not a very important part of the heating system in the country. But if everyone installs such energy-saving units, then it will be immediately possible to estimate the amount of electricity saved.

Minimum electricity consumption - German Wilo pumps

The pump is designed for use in one-pipe and two-pipe heating systems, as well as for "warm floor" and air conditioning systems. The power consumption of this pump is from 3 to 20 watts. The energy efficiency characteristics were taken when pumping water at a temperature of +60 °C. Let's compare the power consumption of Stratos PICO with other home devices.

What is a volatile boiler

Volatile models, being in working order, constantly consume electricity. Gas heating equipment that depends on the power grid is distinguished by:

• according to the installation method - floor and wall options;
• by type of draft - with natural and forced ventilation.

These boilers do not just waste electricity, they need it for:

• electronic ignition;
• automation work;
• circulation pump;
• fans.

The main disadvantage of such modifications is the dependence on the power grid. If there are blackouts in the area or locality, the consumer needs to choose one of two options:

• install a non-volatile model;
• connect the boiler to an uninterruptible power supply (UPS).

In private houses of old construction, the wiring is often in poor condition, which is why the voltage in the network is unstable. In this case, the installation of a stabilizer will help - a device that protects equipment from power surges.

The minimum electric power of gas heaters is 65 W. The higher the performance of the device and the more extensive the functionality of a particular modification, the more kilowatts it consumes. A dual-circuit device, when compared with a single-circuit analogue of equal performance, is more expensive in terms of energy consumption.

Advantages

1. Energy-dependent models, having high heat output, are relatively inexpensive. For example, we can compare a 35 kilowatt Protherm Panther 35 KTV volatile device and a non-volatile analog MORA-TOP SA 40 G. The first costs about 1000 USD, the second - 1900 USD.
2. Comfortable use: almost all processes occur automatically. The boiler does not need to be adjusted and switched, all parameters are adjusted without user intervention.

Main characteristics and features:

• models of low and medium heat output - 10-30 kW;
• can work at low pressures of water and gas;
• power consumption - from 65 kW;
• expansion tank - 10 liters or more.

The most popular are volatile models from the brands Ferolli, Baxi, Beretta, Aton.

The best European electric boilers for home heating 50, 100 and 150 sq.m.

Europe, as you know, is a supporter of high-quality safe, but short-lived devices. A rare item can last more than 10 years. And often it just turns off and that's it - resuscitation will no longer help. But over these 10 years, the quality of work will always remain on top.

Ferroli ZEWS 9

Wall-mounted boiler designed for heating with forced circulation. The device provides for the connection of a boiler or a "warm floor" system.

Ferroli ZEWS 9

Specifications:

power, kWt	9
Recommended heating area, sq.m	100
Heater type	heating element
Voltage, V	380
Power adjustment, kW	multistage
Dimensions, cm	44x74x26.5
The weight	28,6
Heat carrier temperature, °С	30-80
Maximum water pressure in the circuit, Bar	3

It can be connected to a single-phase or three-phase network with a maximum current strength of 41 A for one phase, 14 A for three. There is a self-diagnosis system - the boiler will notify itself if something has failed or the condition is critical. In the instructions, find the error code and decide whether to fix it yourself or from the master.

Among the advantages of this model of the Italian manufacturer, it is worth highlighting the presence of a circulation pump in the kit, the ability to connect to a boiler and underfloor heating. Bribes a full-fledged protection system:

• from overheating
• freezing exception,
• safety valve,
• air vent,
• pump anti-blocking.

The cost of the device will average 34,500 rubles.

Ferroli ZEWS 9 user manual

Protherm Skat 18 KR 13

Single-circuit electric boiler, which is able to provide heat 180 sq.. meters. The heat exchanger is made of stainless steel, a boiler can be connected to the device.

Protherm Skat 18 KR 13

Specifications:

power, kWt	18
Recommended heating area, sq.m	200
Heater type	heating element
Voltage, V	380
Power adjustment, kW	multistage
Dimensions, cm	41x74x31
The weight	34
Heat carrier temperature, °С	30-80
Maximum water pressure in the circuit, Bar	3

Connection to a three-phase network with a maximum current of 32 A. There is a self-diagnosis system - the boiler itself will notify if something has failed or is in a critical condition. Error codes are decoded in the instructions.

The kit includes a circulation pump, expansion tank. It is possible to connect to the boiler and underfloor heating.

The Protherm Skat 18 KR 13 model is characterized by simple and convenient control, when using room regulators, the process will become even easier. Built-in automation guarantees protection against overheating of the coolant and excess pressure in the boiler. The main advantage of the device is economical power consumption, frost protection and the possibility of self-diagnosis.

The average cost of the model is 39,900 rubles.

Instructions for use Protherm Skat 18 KR 13

Vaillant eloBLOCK VE 12

The German single-circuit electric boiler for heating a country house is light in weight, compact in size and concise in design.

Vaillant eloBLOCK VE 12

Model specifications:

power, kWt	12
Recommended heating area, sq.m	150-160
Heater type	heating element
Voltage, V	380
Power adjustment, kW	multistage
Dimensions, cm	41x74x3
The weight	33
Heat carrier temperature, °С	25-85
Maximum water pressure in the circuit, Bar	3

The boiler is equipped with electronic control, which makes it easy to set up the device, and the display allows you to control the temperature of the coolant, determine error codes when diagnosing breakdowns. Connection to a three-phase network with a maximum current of 32 A. There is a self-diagnosis system - the boiler itself will notify if something has failed or is in a critical condition. Error codes are decoded in the instructions.

The kit includes a circulation pump, expansion tank. It is possible to connect to the boiler and underfloor heating.

It is also worth noting the silent operation of the device, the presence of a frost protection function, and power adjustment.

The disadvantage of the product is that the boiler is sensitive to voltage fluctuations in the mains, so the purchase of a stabilizer is required.

The price of the model is from 43,000 rubles.

User manual Vaillant eloBLOCK VE 12

VIDEO: Features of heating a house with electricity

Factors that affect consumption?

The basis is power. For household electric boilers, it varies between 12-30 kW. But you need to take into account not only the power, but also the specifics of your electrical network. For example, if your real voltage does not reach 200 volts, then many foreign models of boilers may simply not work. They are designed for a voltage of 220 volts, and a difference of two dozen volts can be critical.

Even at the design stage, you need to take into account many nuances:

• what boiler power do you need;
• Do you plan to install a single-circuit or dual-circuit system;
• what area needs to be heated;
• what is the total volume of coolant in the system;
• what is the magnitude of the current;
• period of operation at maximum power;
• kilowatt-hour price.

The heat loss of the house is also taken into account. They depend on the materials on which the building was built, the availability and quality of insulation, climate, the size of windows and doors, and other things. With this information, you can more accurately calculate how much heating with an electric boiler costs.

3 What volume of gas must be burned to generate 1 kW

To answer this question, we need to understand such a concept as the calorific value of gas and the efficiency of the boiler. The first term means the amount of energy released during the complete combustion of a kilogram or cubic meter of gas.

To find out how much gas needs to be burned to generate 1 kW, you need to know the efficiency of the boiler

The second term (efficiency) denotes the ability of a heat generating plant to transfer the energy of the burnt fuel to the coolant.Typically, gas boilers can give the coolant no more than 90 percent of the energy of the burned gas. Therefore, when a cubic meter of gas is burned, the coolant will receive no more than 8.37 kW (9.3x90%).

As a result, about 0.12 m3 of gas (1/8.37) is used to generate 1 kW of thermal power. That is, in order for the heating system to receive 1 kilowatt per hour, the boiler combustion chamber must accept and process 0.12 m3 of fuel. Based on this information, we can calculate monthly, daily, and even hourly boiler consumption rates.

Scheme 1: by power

If the average power of the boiler is known, it is not a problem to calculate how much the device consumes per month and for the whole winter.

	Calculation of daily consumption.
	Calculation of the average monthly electricity consumption.
	Consumption during the entire heating season.

Example

Let's find out, as an example, how much energy is needed for a boiler with a nameplate power of 12 kilowatts:

• Its average power is 12/2=6 kW;
• Consumption per day - 6 * 24 = 96 kilowatt-hours;
• In a month, heating will consume 96*30=2880 kWh;
• Electricity consumption for the winter with a heating season duration of 180 days (from October 15 to April 15) will be 180 * 96 = 17280 kWh.

The duration of the heating season in your area can be found on this map. Heating turns on when the air temperature drops below +8 and turns off when heated above +8.

And now let's do one more calculation - find out how much heating will cost. I'm using the data for a one-part fare in Sevastopol as of January 2017:

1. When consuming up to 150 kWh per month, a social tariff of 2.42 rubles applies;
2. In the range of 150 - 600 kilowatt-hours per month, the price increases to 2.96 rubles;
3. Electricity in excess of 600 kWh per month costs 5 rubles 40 kopecks.

Current electricity tariffs. Sevastopol, first half of 2017.

Of the monthly 2880 kWh, 150 will fall on a preferential tariff and will cost 150 * 2.42 = 363 rubles. The next 450 kWh are paid at 2.96: 450*2.96=1332. The rest is 2880-600 = 2280 kWh at 5.40 rubles, or 12312 rubles.

Total 12312+1332+363=14007 rubles.

When using a single-tariff meter, electric heating will cost a penny.

Switching to mains gas will greatly reduce your home heating costs.