How much cheaper is gas than electricity? Which boiler to choose - gas or electric
Natural gas as an energy carrier has many advantages over all other energy carriers. One of the main ones is the lowest price. Urban housing is mainly gasified, but the owners of country cottages often have to choose among alternative energy sources, considering, first of all, electricity, liquid and solid fuel. However, many, starting from the cheapness of gas, strive at all costs to gasify the cottage, despite the high cost of the highway. But in practice, it may turn out that the “cheapness” of gas heating will be more expensive than the cost of heating with the most expensive energy carriers.
Theoretically, electricity is more expensive than gas, when comparing the costs per unit of heat received, about 8.3 times. This figure out of the current prices for gas and electricity, taking into account the calorific value of energy carriers and the efficiency of heating appliances. So, when burning 1 m³ of natural gas in a conventional (non-condensing) gas boiler, about 9.3 kW of heat energy is generated. If the cost of 1 m³ of natural gas is 4.495 rubles, then, accordingly, 1 kW of pure "gas" heat energy costs 0.483 rubles. And 1 kW of electricity costs 4.01 rubles. despite the fact that the efficiency of electric heaters is almost 100%. Thus, "gas" heat with a simple arithmetic calculation costs 8.3 times cheaper than "electric".
- RUB 4,495 : 9.3 kW \u003d 0.483 rubles / kW
- 4.01 rub. : 0.483 rub. = 8.3
In practice, this difference is always lower due to the peculiarities of the work. gas equipment. But in an objective comparison of heating costs when using one or another energy carrier, it is also necessary to take into account the costs of energy communications, boiler equipment, ongoing maintenance, and equipment resource.
Obviously, in order to accurately establish the difference in the operating cost of gas, electric and other types of heating, it is necessary to conduct research on a real object, where the same conditions will be met. It is difficult to compare the heating costs of cottages of different architecture, different degrees of insulation, with different glazing areas, etc. As objects of study, apartments of the same area located in the same building are best suited.
Let's take a look at a real-life example.
So, we have two completely identical one-room apartments located in the same entrance one above the other (3rd and 4th floor). Specifications:
- external walls made of silicate bricks. Wall thickness 53 cm (resistance to heat transfer 0.95 m² °C / W);
- total area of apartments 36 m²;
- glazing - metal-plastic windows with single-chamber double-glazed windows;
- hermetic doors;
- natural ventilation;
- standard electrical equipment.
Apartment #1 equipped with gas heating: non-condensing single-circuit gas boiler with coaxial chimney; the maximum power of the boiler is 7 kW. The cost of the boiler, system and permit for the installation of gas equipment amounted to 35 thousand rubles.
Apartment #2 equipped with electric heating: a convector with a maximum power of 2 kW and oil radiator similar power. The total cost of electrical heating appliances is 6 thousand rubles.
It is believed that for heating every 1 m² of room area, an average of 0.1 kW of thermal energy is required per hour. Based on the design parameters for heating an apartment of 36 m², it will be required: 36 × 0.1 = 3.6 kW per hour. I must say that this ratio will be fair for poorly insulated houses in the most cold period years when the outside temperature falls below -20°C. However, during the heating season in the middle lane, such cold weather lasts only a few weeks. Therefore, the real average seasonal costs of heat energy are much lower.
In January 2013, apartment No. 1 used 190 m³ of gas for heating. At today's prices, this is 854 rubles. In the same month, apartment No. 2 consumed 800 kW of electricity, of which 750 kW was used for heating, since electricity costs outside the heating season are about 50 kW. At current prices, 750 kW of electricity costs 3,007 rubles. It turns out that apartment #1 spent (3007:854= 3.52) rounded 3.5 times less money than apartment #2. At the same time, the temperature in both apartments is maintained at 24°C.
Why is the difference in the cost of heating gas and electricity in completely identical apartments not 8.3 times, but only 3.5 times? Let's leave this question to theorists or those who clearly overestimate the efficiency of gas boilers and the calorific value of gas ... However, facts are a stubborn thing.
equipment profitability
Now consider the difference in gas and electric heating, not only in terms of operating costs, but also in terms of equipment profitability. As noted above, the initial investment in heating apartment No. 1 amounted to 35 thousand rubles, of which 15 thousand were spent on the boiler itself. All elements of the water heating system, with the exception of pipes (although they are not eternal) have a limited resource. In addition, annual maintenance is required. gas boiler, and in the worst case, even its repair. According to statistics gas boilers have to be overhauled or completely changed after 7-10 years. Moreover, expensive branded boilers are not a panacea. They also break, and their out-of-warranty repairs are much more expensive. However, it breaks or does not break - this is a matter of chance, so we will not take breakdowns into account. Let's just note this as an existing risk factor and a likely cost item. Can break and electric convectors, but their cost is incomparably lower than that of gas equipment, and they break less often, especially branded ones.
Starting expenses for the heating equipment of apartments No. 1 and No. 2 amounted to 35 thousand and 6 thousand rubles, respectively. It follows from this that the owners of apartment No. 2 saved 29 thousand rubles, which they can spend on paying for electricity. This amount is enough to buy 7,232 kW, which is enough for 3 heating seasons. During this time, apartment No. 1 will spend about 10,000 rubles on gas, which gives an occasion to present one more heating season as a gift to apartment No. 2. And only after 4 years of operation of the heating equipment, the heating systems of both apartments are aligned, which is called “by zeros”. Further, apartment No. 1 receives net savings ... However, savings are only possible if the gas boiler works flawlessly. If it has to be replaced, then the payback of the system will be extended for another couple of years.
What gives thermomodernization? The owner of apartment No. 2 (with electric heating) next year decided to spend less on heating and for this purpose insulate the northern outer wall of the apartment. The area of this wall was 17 m². This is the only solid wall (without windows) in the apartment. The other wall had a balcony block and a window in the kitchen, so we didn't expect a big effect from its insulation. Warming was carried out by the method of bonded insulation using polystyrene foam 50 mm thick. As a result, the total heat transfer resistance of the wall was doubled to 2.0 m² °C/W. And the owner of apartment No. 1 did not want to insulate the wall, having calculated that this investment in his case would pay off at least 10 years. How did the insulation affect?
In December 2013, 500 kW of electricity was spent on heating apartment No. 2, and 150 m³ of gas was spent on apartment No. 1. In terms of money, these are 2005 and 674 rubles, respectively, i.e. the difference was no longer 3.5, but 3 times, i.e. decreased by 14.3%.
The owner of apartment No. 2 spent 8,000 rubles on thermal modernization. The payback period for this investment, according to approximate calculations, will be about 5 years. But the benefit in this case is not only in reducing the cost of electricity, but also in reducing the load on the power grid.
In the example given, the comparison was made in one-room apartments, but if these were three-room apartments, the difference between the costs could be greater, since more electric heaters or an electric boiler with a water heating system would be required. In addition, in order to heat a three-room apartment with electricity, it would be necessary to lay a dedicated line, because. the domestic network is not designed for loads created by simultaneously switched on 3-4 electric heaters or an electric boiler with a power of more than 10 kW.
Conclusion: the actual difference between gas and electric heating costs is 3-3.5 times and not 8-9 times. If we take into account the cost of servicing gas equipment and its planned replacement in the future, then the actual difference can be reduced to 2-2.5 ra h. But thermal modernization pays off faster when electric heating than with gas. That is why, in the absence of a connection to the main gas, country cottages are recommended to be well insulated.
In this article, I would like to analyze the question that today worries many private developers: “How to heat your house?” The question arises primarily not because of the cost of energy, everything is obvious here, because. just look at the tariffs on the official websites of suppliers. The question arises because of the cost of the initial investment in the heating system itself.
For those who have already managed to inspire about the efficiency of electric heating, I inform you an indisputable fact. One kilowatt of energy is ALWAYS one kilowatt of energy in heating! Electric heating 1 kW ~ 5 rubles, and gas heating 1 cubic meter. gas ~ 8KW ~ the same 5 rubles!
But nevertheless, let's compare in more detail with examples.
Electric heating. Pros: Comfortable, Clean, Inexpensive
Let's leave out the fact of the high cost of electricity for now, then we will see many advantages. electrical type heating:
- Ease of installation. Requirements for the installation of electric boilers are minimal, it will not be necessary to allocate a separate boiler room, its registration and approvals.
- Small installation costs. In fact, they come down only to paying for the installation itself.
- Security, incl. ecological. Electric boilers do not threaten to explode, do not emit carbon monoxide, do not form combustion products.
- Ability to reduce energy costs by installing a multi-tariff meter. It allows you to use the electric boiler at night, when the cost of electricity is much less.
- Ease of use. In this capacity, electric boilers are especially advantageous compared to solid fuel boilers: they do not require firewood or coal, storage space, or cleaning the boiler from soot.
However, for the efficient operation of such a boiler, a lot of electricity is required. Therefore, the decision on its installation should be made taking into account the existing capacities, the possibilities of their increase, as well as the maximum heat saving at home.
And further important point! If your house is 250 sq.m., then in winter period about 10-15 kW per hour is required for maximum warm-up. And the power of your network and wires is enough? As a standard, they connect 2-phase -10 kW, and three-phase 15 kW. Those. You can’t even turn on the electric kettle, not to mention all the electrical appliances in the house.
Gas heating: cheap, profitable, rational during operation, but expensive during installation
This is the most expedient type of heating, provided that the main gas pipeline is located near the house. Helps reduce installation costs correct execution several conditions:
- order in one company and the project, and installation, and maintenance of the heating system;
- competent preparation of the boiler installation site;
- purchase of a boiler, the type of which corresponds to the area of \u200b\u200bthe room;
- selection of the optimal chimney;
- the use of underfloor heating for uniform heating (expensive, but worth it).
In addition to low cost gas heating has advantages in the possibility of choosing the type of circulation - natural (electrically independent) or forced, and in a wide model range boilers - wall and floor. Although now almost universally done closed system and This means that pumps are a must.
Comparison of the cost of energy carriers for heating on the example of a small IZHS house
Let's take an ordinary house ~ 100 sq.m. area.
The cost of equipment and heating when using:
1) main gas (average daily costs - 12 cubic meters):
- the internal system of the house - 300 thousand rubles;
- boiler and equipment - 50-100 thousand rubles;
- connection to the highway - 100-750 thousand rubles;
- heating season - 4284 rubles.
2) electricity (average daily costs - 120 kW):
- internal system of the house - 100-150 thousand rubles;
- boiler and equipment (good, with control) - 50 thousand rubles;
- connection to the network for 20-25 kW ~ 100 thousand rubles (pole, connection, permits for such power, etc.);
- heating season - 46620 rubles.
It can be stated that with a certain savings on equipment and device internal system with electric heating, the seasonal fee is almost 10 times higher!
You can also write that most boilers can work both on the main and on liquefied gas. When choosing a boiler, it is better to give preference to those that have a lower threshold for the working gas pressure. This will maximize the use of the balloon. With properly selected settings, the heating system consumes one in three to four days. 3-4 cylinders are consumed per week to heat an insulated house with an area of \u200b\u200b~130 m2 and water supply. At the same time, the temperature of +21 ... +23 ° С is maintained in the house around the clock, and on the street from minus 18 ° С to minus 23 ° С. At prices in 2015, it comes out to about 7,000-10,000 rubles per month.
Fuel consumption can be reduced by the same methods as in any other:
- install automation;
- insulate the house.
Conclusion
- Heating with gas is much more profitable in operation. Alas, it is more costly in terms of initial costs.
- Gas heating can be protected from power outages by installing an uninterruptible power supply (UPS). There is usually no power outage for more than 1-2 days. A good UPS with a large battery for a pair of pumps and the boiler itself is enough for 20-40 hours, which means the house will not cool down. Alas, in severe frost without heating, a house on an electric boiler can freeze and mold, fungus and everything connected with it will go. However, for safety net when using an electric boiler, you can purchase a generator, although a 5-8 kW generator costs from 150 thousand rubles. Here's the savings in numbers.
- When buying a cottage in a village where natural gas is supplied, the price per square meter will be much higher than in its absence. This is due to the developer's significant costs for coordinating gas pipeline tie-in points, obtaining technical conditions, permits, and also for installation. As a result, the cost may double compared to a similar site without gas supply. In addition, electricity appears in holiday villages before gas: it is much cheaper, easier and faster to conduct it than gas.
Energy resources are constantly rising in price, gas and electricity prices change almost every six months. Maintaining heat in the house is a heavy burden on the family budget, so it is not surprising that everyone wants to increase the efficiency of climate technology in order to reduce utility bills. Insulation of facades, installation of double-glazed windows, the use of "smart" household appliances with reduced energy consumption do not always help. If myself heater consumes a lot of fuel - no measures will completely eliminate the problem.
When choosing a new heater, the question arises: which boiler is better, gas or electric? Rural dwellers, who have access to cheap solid fuels, are more fortunate. After all, if it is possible to buy firewood cheaply (or cut it when caring for the garden), you can put a combined boiler and save. In a city apartment or house, you have to choose between gas and electricity. And even then, not everywhere the service company (ZHEK, kommunkhoz) allows residents to refuse central heating in favor individual heating. If there are no such obstacles in your house, very good. In this case, you are among the lucky ones who can afford to choose the most economical heating option.
Which is better, gas or electric boiler?
Before proceeding with the calculation of the heating costs of both types of boilers, it is necessary to analyze and compare their other consumer characteristics.
- Installation. Installation of an electric boiler does not require a complex organization of a specially designated place for it. Since there is no combustion during its operation, there is no need to ensure the flow of oxygen and the removal of combustion products outside the room. For gas heaters, at least the chimney sleeve must be led outside.
- Safety. Any boiler requires increased attention and compliance with safety rules. However, gas models are more finicky in this regard. When broken, they can become a source of poisonous gas, which, if the critical concentration is exceeded, also explodes from the slightest spark. A faulty electric boiler connected to ground, even if it is shocked, will not kill.
- Ease of maintenance. The heating element of an electric boiler is cheaper and easier to change than a combustion chamber on a gas unit. The heat exchange tank of the electric boiler is also easier to replace.
- efficiency. The efficiency of an electric boiler is almost always above 95% and approaches one. These are the design features: the heating element is immersed in a container with water and gives it all the generated heat. With gas models it is more difficult: only high-quality condensing boilers have a real efficiency of 95% or more. The cheapest heaters can have a coefficient of 70-80%.
Thus, the answer to the question of which boiler is better, gas or electric, to buy turned out to be in favor of the second option. It is easier to connect it, and it is cheaper to maintain, and it consumes fuel more rationally. In terms of safety, electrical appliances are also superior to gas appliances.
We calculate profitability
Once electric boilers turned out to be better than gas in all respects - the question arises: why so many people prefer gas. The answer to it lies in the inability to quickly estimate and compare the cost of an energy carrier, based on the amount of heat generated. Even 2 years ago, 1 cubic meter of natural gas cost an apartment about 1 hryvnia, a bill of 200-400 hryvnia for a winter month seemed feasible, so the need to switch to electricity did not look reasonable and profitable. With the growth of tariffs, the relevance of the issue has increased dramatically.
Calorific value of gas
The normative document regulating the quality of natural gas for consumers is GOST 5542-87. An excerpt from it, given on the official website of NJSC Naftogaz of Ukraine, indicates a number of 31.5 MJ / m3 as the lower value of the calorific value. When translated into the usual kilowatt-hours, according to which electricity is charged, the value is 8.75 kWh. That is, when burning 1 m3 of natural gas, an amount of heat is released that is equivalent to the consumption of 8.75 kWh of electricity.
According to some skeptics, energy suppliers "dilute" the gas, reducing its combustibility. However, without evidence, such statements are unfounded, and the deterioration of combustion can be attributed to poor-quality arrangement of the air supply system and the removal of combustion products in the boiler. Often, it is these shortcomings during the installation process that lead to a drop in the efficiency of heating equipment. There are no good reasons not to trust the official documentation at the moment.
Having comparative heat values, you can proceed to the calculation to find out which is more profitable - a gas boiler or an electric one.
Calculation of the energy efficiency of a gas boiler
To calculate the energy efficiency of a boiler, it is necessary to multiply its efficiency by the calorific value of the fuel. As practice shows, the real efficiency for budget heaters without a condensing mechanism depends on the professionalism of the installers and the arrangement of the ventilation system. Usually it is about 70-80%. Multiplying 8.75 kWh by an efficiency of 70%, we get a value of 6.125 kWh. Thus, in reality, a cheap boiler emits a little more than 6 kWh of heat from a cubic meter of gas for space heating.
Boilers with a condensing mechanism are more energy efficient and, due to energy recovery from combustion products, their real efficiency is up to 95%. 8.75*95%=8.31 kWh. This number is significantly higher than the first example and clearly demonstrates the difference in efficiency.
According to the resolution of the Cabinet of Ministers, from May 1, 2016, a new gas tariff came into force, setting the price at UAH 6,879 per 1,000 cubic meters of fuel. The cost of one m3, respectively, amounted to 6 hryvnia 88 kopecks. According to the regulations, 0.1 kW of power is required for heating residential premises with normal thermal insulation to room temperature for each square meter. For a private house or apartment with a total area of 50 m2, it is necessary to generate 5 kW of energy per hour. When using a cheap boiler, for this it is necessary to burn 5/6.125=0.82 m3 of gas. With a condensing boiler, the flow rate is reduced to 5/8.31=0.6 m3.
It is worth considering that the boiler does not operate at full capacity around the clock. On autumn and spring days, as well as in the absence of severe frosts, about 50% of the capacity is used on average. If you multiply the hourly value by 24 (to get the daily flow), then by 30 (to determine the flow per month), and multiply by 50% (to get the average load) - it turns out from 216 to 295 m3 / month, depending on the efficiency boiler. In monetary terms, this is from 1488 to 2032 UAH.
Calculation of the energy efficiency of an electric boiler
It is easier to calculate the energy efficiency of an electric heating boiler, since the tariff is tied precisely to the actual volume of finished energy consumed, and not to the amount of raw materials for its production. The efficiency of the electric boiler is higher, it ranges from 95 to 99%. That is, even a cheap heater from 1 kW of consumed energy releases 950 W of heat. In the case of high-quality models, the drop in efficiency is so negligible that it can even be neglected in practice.
The current electricity tariff (valid until September 1, 2016) should not be taken into account, since in the near future heating season it will be irrelevant. From 01.09.2016 to 28.02.2017, a tariff of UAH 0.714 per 1 kWh is in effect for consumers living in houses with electric heating registered in the prescribed manner. It covers up to 3600 kWh per month. Above the tariff is 1.638 UAH/kWh.
On March 1, 2017, a new electricity tariff will come into force, which will be valid on an ongoing basis (so far, the authorities do not plan to change it). It will amount to UAH 0.9/kWh up to 3,000 kWh/month and UAH 1.68 – over 3,000 kWh/month.
If we take as a conditional example the same room with a total area of 50 m2, as well as a power rate of 100 W / m2, with an average load of 50%, we can compare the efficiency of electricity and gas. 50 m2 (area) * 0.1 kWh (flow rate) * 24 (hours) * 30 (days) * 50% (load) = 1800 kWh / month. This value is within the limit fixed by the tariff, therefore, in the heating season 2016/2017, the costs will amount to 1800*0.714=1285 UAH per month. After the final increase in tariffs to 0.9 UAH/kWh, the amount will increase to 1800*0.9=1620 UAH/month.
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One of the main decisions when creating autonomous heating at home, there is a choice between whether to use an electric or gas boiler as the main source of heat. Several factors will influence the decision:
- Ease of installation and installation costs.
- Safety.
- efficiency and functionality of the system.
- Features of operation.
- Economic component.
What are the differences between gas and electric boilers
When choosing a gas or electric boiler for heating a private house, first you need to understand the features associated with the operation of each heating unit:- The principle of operation - in gas equipment, a coil is used to heat the coolant, passing directly above the burner. Heating is carried out by a flame from gas combustion. Household electric boilers use the principle of direct or direct heating of the coolant. The probability of an explosion (present in gas boilers) is completely absent.
- Stability of operation - an electric boiler requires a stable voltage in the network, which is not always possible in domestic realities of operation. The gas pressure in the line can also fluctuate.
- Safety - gas boilers differ from electric ones in that the work of the former is based on constant ignition and attenuation gas burner which in itself is potentially dangerous. It is not surprising that stringent requirements are imposed on the installation of gas equipment. Complex automation is required for adjustment.
- Management - in this respect, an electric or gas boiler for heating a private house is not much different. If necessary, you can install a remote control unit, regulate the operation by means of room thermostats, etc.
Which boilers have higher efficiency - on gas or electricity
The comparison of the electric boiler and gas equipment can be continued by comparing the efficiency of each of the devices:- Gas boilers - classic models, have an efficiency equal to 88-92%. In condensing boilers, the coefficient rises to 108%.
- Electric boilers - performance depends on the principle of operation. Electrode boilers have an efficiency equal to 100%, their application is efficient and economical.
Models using the principle of indirect heating of the coolant have a lower efficiency. A large amount of heat is lost during the heating process.
What is more profitable financially - an electric boiler or a gas boiler
To determine which boiler is more economical, take into account not only the cost of the fuel used to produce heat, but also the costs associated with the acquisition, installation and subsequent operation:- The cost of fuel - gas, despite the constant rise in price, remains the cheapest type of fuel. Considering the cost of electricity, some manufacturers of electric boilers began to manufacture models that connect to a multi-tariff meter and are equipped with a thermos storage tank. This solution has reduced energy costs by approximately 30%.
- The cost of boilers - models that run on electricity are much cheaper than analogues on gas. Domestic gas boilers will cost more than an electric boiler by 30-40% more. The difference with foreign models will be approximately 300%.
- The cost of installation and subsequent maintenance. Registration of gas equipment and manufacturing project documentation, in some regions of Russia, will cost several tens of thousands of rubles. If we take into account the additional costs of connecting and connecting the main, the efficiency of such boilers will not be as absolute as it might seem at the beginning.
To install an electric boiler, you will also need costs, mainly associated with the allocation of a separate voltage line. But even with the most unfortunate "scenario", the costs will not exceed 20,000 rubles. There are differences in the cost of installing an electric boiler from a gas boiler.
Which boiler is easier to operate - on electricity or gas
The advantages of gas heating boilers, relative to electric boilers, are solely in the cost of fuel. For the smooth operation of gas equipment, a well-tuned automation is required, connected to shut-off and control valves. Even small violations in the settings lead to a refusal to start the heating system.The electric boiler is controlled by several sensors, and safety is ensured by grounding and installation of RCDs, and automatic machines.
In settlements with a central highway passing next to a residential building, it is more economical to install gas boilers. In other cases, due to high installation costs, it is better to choose electric boilers.
I will give a particular example. I repeat the private example, fuel tariffs, service prices can vary greatly in different regions, as well as heat loss and house area can also vary.
And so: as of October in the Moscow region
electricity tariff 4.01 rub. for 1 kWh
Gas tariff (main gas) 3.795 rubles per 1 m3 of gas
Electricity supplier Istra electricity networks.
Gas supplier Mosoblgaz (Krasnogorsk), the last 600 m of pipes in front of the user are privately owned.
Natural (main) gas has a calorific value (depending on the field) of 8000 kcal/m. cube (under normal conditions). hence, if you burn 1 cubic meter per hour, you will get 8000 kcal / h or 9304 watts. But! All boilers have efficiency and of course not 100%, but you really need to look at the characteristics of the boiler.
Let's take for example a well-known reliable boiler Viessmann Vitopend 100 and see the max thermal power 24.8 kW, natural gas consumption at a maximum power of 2.83 m3 / h, and therefore 1 m3 is only 8.7 kW.
3.795 rubles / 8.7 kW we get 0.436 rubles per 1 kWh on main gas
and for electricity we get 4.01 rubles per 1 kWh, and so the difference is 9 times.
But that's not all.
The efficiency of electrical appliances is almost 100%, well, or 99.9%, in general, 0.1% can be neglected, and no matter what power they are.
But gas boilers whose efficiency is calculated mainly for maximum power do not always give out high efficiency, at the time the burner starts, the efficiency is possible much lower until the heat exchanger warms up, yes, it’s a few seconds, but it builds decently a year, in general, even with a new excellent boiler, taking into account the new clean chimney, the new clean heat exchanger, the flow rate will be exactly 10 percent higher per year than according to the passport, and in the worst case, 50 percent percent. But let's say we have an excellent boiler. Total 1kWh will cost us 0.48 rubles.
But in the house there are costs not only for heating but also just household appliances. As you know, all household appliances that consume electricity generate heat, and ultimately almost all the energy is converted into heat, and therefore, the more household appliances in the house, the lower the heating bill.
The difference is 8.3 times, not 9.
– heating 5720kW*h year
— DHW 3700kW*h year
– other 3300kW*h year
for heating with direct electricity
- heating 5720 kW * hour year * 4.01 \u003d 22937.2 rubles
- DHW 3700kW * hour year * 4.01 = 14837 rubles
- other 3300kW * hour year * 4.01 = 13233 rubles
when heating with main gas
- DHW 3700 kW * hour year * 0.48 = 1776 rubles
– other 3300kW per year
it all consumes electricity, and therefore gives heat, except for such things as a dishwasher, washing machine, street lighting, etc. which has nothing to do with heat dissipation in the house
subtract this (using the collected information)
3300-(1102 kWh per year)=2198 kWh per year
3300kWh * 4.01 = 13233 rubles
— heating 5720 kWh per year, but because we have Appliances, we subtract her heat
5720-2198=3522 kWh
3522 kWh * 0.48 = 1690.5 rubles
With the presence of main gas, we spend 16,699 rubles a year
The difference is 3 times (and not 9 as in direct heat calculation).
But! That's not all.
During normal operation, the gas boiler needs after-sales service, at least absolutely all my friends conclude a boiler service agreement every year, which in 60% of cases justifies itself. If we take an inexpensive company, then the cost of an annual contract costs an average of 8,000 rubles.
Because the last part in a privately owned gas pipeline chain, the pipe is quite new, and according to the requirements it is of medium pressure, the cost of servicing hydraulic fracturing, pipeline, etc. Mosoblgaz costs about 80t.r. per year, this is about 40 people, of course, than more people the cheaper, we will actually take 100, which will never be. That is, per person 800 rubles per year
Now add these figures to the cost of heating and see.
only with electricity we spend 51007 rubles per year
With the presence of main gas, we spend 16699 + 8000 + 800 = 25499 rubles per year
The difference is only 2 times (and not 9 as in direct heat calculation).
And now let's estimate the costs for 15-16 years, subject to unchanged tariffs.
Suppose we have the same system (which is actually not true, sometimes with electrical system heating, there are simply electric convectors, and no coolant that needs to be changed at least once every 10 years), let's compare an electric boiler and a gas boiler. An electric boiler with a heating element will work 100% for 10 years (we take into account normally serviceable boilers), and a gas boiler in practice does not work for more than 8-10 years, or even less (6-7), on average, the period of repair / replacement of a gas boiler is 15 years will be 2 times, and electro 1 time (in a bad scenario). The cost of a good gas boiler with installation, delivery, etc. 50t.r., electric 30t.r., if just electric convectors, then the cost of repair / replacement will cost about 6t.r., and about 10-20t.r. will be added to the water system. to replace the coolant.
That is, taking into account the prospect of 15 years (provided that nothing breaks once again)
The costs will be
Only with electricity (electric convectors) we spend ~51500 rub per year
With the presence of main gas, we spend ~30150 rubles per year
The difference is 1.7 times.
p.s. this example is for a particular house with an area of 88 sq.m., which is quite well insulated.
The answer to the question is why gas was not brought to him yet ?! The cost of connecting gas to full readiness is about 700,000 rubles, with savings of 21,000 rubles per year, the payback period is 33 years (and this is in a good scenario)