Comparison of heating boilers using different types of fuel

Let us theoretically consider options for heating a cottage with an area of ​​285 sq.m. with the possibility of using various energy sources. According to calculations, for heating a house, taking into account infiltration, ventilation, and humidification, 34 kW of useful power is required. When comparing the costs of heating a house, depending on the fuel used, we will proceed from the same conditions: each boiler is in operation for the same amount of time, and the heating season is 7 months. We will compare the cost of heating costs for the same house, under the same conditions.

If the boiler operated continuously, then per month it would be necessary: ​​34 kW X 24 hours X 31 days = 25,519 kW*hour of energy. We will assume that the boiler will work approximately 1/2 of the time, so we divide 25,519 kWh by 2 and get 12,760 kWh. These are the costs for 1 month of the heating season. Multiply by 7 months of the heating season and get 89,317 kWh.

The figures given here do not indicate that this is exactly the amount it will cost to heat a house. Costs can be either less or more. It very much depends on how well the house is built and how cold the outside temperature will be in winter. The heating system will maintain a temperature of 24 degrees constantly in the house or only when necessary when the owners or guests are staying in it. There are many technical possibilities for reducing the material costs of heating a house when no one is temporarily living in it or is absent. These figures give an idea of ​​what type of fuel is currently the most optimal as an energy carrier for a home heating system. It is worth remembering that in addition to fuel costs, there are other operating costs, in particular service costs. Based on this parameter, we can say that the minimum costs will be when using an electric boiler, and the maximum when using liquid fuel. When choosing the best option for heating your home, it is worth comparing not only operating costs, but also the initial investment in installing and installing the system and equipment, as well as all additional functions and capabilities.

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What's cheaper to heat a house? comparison table

Choosing the optimal method of heating a country house comes down to comparing all types of fuel and technical characteristics of heating systems.

Fuel comparison table:

* — main gas was not taken into account in this calculation, since it is beyond competition.

After carrying out all the calculations and comparing the positive and negative aspects of all types of heating, we find out what is cheaper to heat a house and it turned out to be ordinary firewood. It is advisable to install two types of boilers. The one that is more profitable and convenient during a certain period will be used.

Main fuels

Today, there are four types of fuel that have already been tested over the years, have been used for a long time and have proven themselves in one way or another.

• The first is natural gas
  . We have a lot of natural gas in our country. Therefore, it is quite cheap. If you don't consider the various nuances. But we'll talk about this a little later.
• The second method is liquefied gas. Or it is also called SPBT (technical propane-butane mixture). This gas is very often seen at gas stations. Cars are fueled with it. This gas can also be used for heating country houses and any premises.
• The third type of fuel is diesel fuel or diesel fuel.
• The fourth is electricity.

So, let's look at each of these types separately. What are the pros and cons, and its cost. Cost of investment and cost of operation per day, per month and per year.

Other heat sources

To assess how costly heating with electricity is, it is necessary to compare it with other energy sources. It should be taken into account that the efficiency of fuel boilers is far below a hundred: for gas boilers it is about 93%, for wood and coal boilers it is about 85%.

Below is the cost per 1 kWh for different types of fuel:

1. Natural gas: 0.68 rubles, taking into account efficiency - 0.75 rubles.
2. Oak firewood: 1.09 and 1.36 rubles, respectively.
3. Coal: 1.33 and 1.57 rubles.
4. Wood pellets: 1.51 and 1.78 rubles.
5. Liquefied gas: 1.99 and 2.13 rubles.
6. Diesel fuel: 3.51 and 3.90 rubles.

In each case, heating costs for the season will be (for 17,388 kWh):

• natural gas: RUB 13,041;
• oak firewood: RUB 23,648;
• coal: RUB 27,300;
• wood pellets: RUB 30,950;
• liquefied gas: RUB 37,036;
• diesel fuel: RUB 67,813.

The average price level is given.

Heating with electricity or gas. Calculation. Comparison.

Many people ask whether heating with gas or electricity is cheaper and by how much?! The answer is, of course, gas, but we’ll try to calculate how much.

Let me give you a particular example. I repeat a private example, fuel tariffs, service prices can vary greatly in different regions, and heat loss and area of ​​the house can also vary.

And so: as of October in the Moscow region

Electricity tariff 4.01 rub. for 1 kWh

Gas tariff (mains gas) RUB 3,795 per 1 m3 of gas

Electricity supplier is Istra Electric 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 approximately 8000 kcal/m. cube (under normal conditions). hence, if you burn 1 cubic meter per hour, you will get 8000 kcal/hour or 9304 W. 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 as an example the well-known, reliable Viessmann Vitopend 100 boiler and see the maximum thermal power is 24.8 kW, the natural gas consumption at maximum power is 2.83 m3/h, and therefore 1 m3 is only 8.7 kW.

3,795 RUR/8.7 kW we get 0.436 RUR 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 is not all.

The efficiency of electrical appliances is almost 100%, or 99.9%, in general 0.1% can be neglected, and it doesn’t matter what power they are.

But gas boilers whose efficiency is designed mainly for maximum power do not always produce high efficiency; at the moment the burner starts, the efficiency can be much lower until the heat exchanger warms up, yes, this is a few seconds, but per year it packs decently, in general, even with a new excellent boiler, taking into account a new clean chimney, a new clean heat exchanger, we will get a yearly consumption that is exactly 10 percent higher than according to the passport, and in the worst case, 50 percent higher. But let's say we have an excellent boiler. Total 1 kWh will cost us 0.48 rubles.

But in the house there are costs not only for heating but also simply for 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 will be.

The difference is 8.3 times, not 9.

Actual example:

https://sdinfo.ru/%D1%8D%D0%BA%D1%81%D0%BF%D0%BB%D1%83%D0%B0%D1%82%D0%B0%D1%86%D0 %B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B5-%D1%80%D0%B0%D1%81%D1%85%D0%BE%D0%B4%D1% 8B/

— heating 5720 kW*hour year — hot water 3700 kW*hour year — other 3300 kW*hour year

when heating with direct electricity

— heating 5720 kW*hour year * 4.01 = 22937.2 rubles — hot water 3700 kW*hour year * 4.01= 14837 rubles — other 3300 kW*hour year * 4.01= 13233 rubles

with main gas heating

— DHW 3700 kW*hour year * 0.48= 1776 rub.

— other 3300 kW per year

this all consumes electricity and therefore provides heat, except for such things as a dishwasher, washing machine, street lighting, etc. which is not related to heat transfer in the house

subtract this (using the information collected)

https://sdinfo.ru/%D1%80%D0%B5%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5-%D0%BF%D0%BE% D1%82%D1%80%D0%B5%D0%B1%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5-%D1%8D%D0%BB%D0%B5%D0 %BA%D1%82%D1%80%D0%BE%D1%8D%D0%BD%D0%B5%D1%80%D0%B3%D0%B8%D0%B8/

3300-(1102kWh per year)=2198 kWh per year

3300kWh*4.01=13233 RUR

— heating 5720 kW*hour per year, but because... we have household appliances, we will subtract their heat

5720-2198=3522 kWh

3522 kWh* 0.48 = 1690.5 rubles

Total

We spend 51,007 rubles per year on electricity alone

With the presence of main gas, we spend 16,699 rubles per year

The difference is 3 times (and not 9 as in the direct calculation of heat).

But! That's not all.

During normal operation, a gas boiler requires servicing; at least absolutely all my friends sign a boiler maintenance contract every year, which pays off in 60% of cases. If you take an inexpensive company, the cost of an annual contract costs on average 8,000 rubles.

Because the last part in the gas pipeline chain is privately owned, the pipe is quite new, and according to the requirements it is of medium pressure, the cost of servicing the hydraulic fracturing, pipeline, etc. Mosoblgaz costs about 80 thousand rubles. per year, this is about 40 people, of course, the more people the cheaper, let’s take realistically 100, which will never happen. That is, 800 rubles per person per year

Now let’s add these figures to the cost of heating and see.

Total

We spend 51,007 rubles per year on electricity alone

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 the direct calculation of heat).

Now let's estimate the costs for 15-16 years, provided tariffs remain unchanged.

Let’s say we have the same system (which is actually not true; sometimes with an electric heating system there are just 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 working boilers), and in practice a gas boiler 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 electric 1 time (in a bad situation). 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 again)

The costs will be as follows

~51,500 rubles per year with electricity alone (electric convectors)

With the presence of main gas, we spend ~30,150 rubles per year

The difference is 1.7 times.

ps this example is for a specific house with an area of ​​88 sq.m. that is quite well insulated.

The answer to the question is why wasn’t gas supplied to him?! The cost of connecting gas to full readiness is about 700,000 rubles, with a saving of 21,000 rubles per year, the payback period is 33 years (and this is in a good situation)

Tags: choice of fuel for heating, Comparative calculation of heating, electricity or gas