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Calculation of the power of a gas heating boiler from the area. How to calculate the power of a boiler for heating a house

One of the main conditions for comfort in the apartment is the heating system. And the type of this heating, along with the equipment for it, should be taken into account even at the initial stages of building a house. In order for the heating in the house to be as efficient as possible, it is necessary to correctly calculate the required boiler power depending on the heated area.

It is about how to correctly calculate the power of a heating boiler that will be discussed in today's article. Heating systems are different, they all have their own characteristics, which should be taken into account during calculations.

Formulas and calculation coefficients

Before proceeding directly to the power calculations, let's first consider what indicators will be used.

Heater power per 10 square meters, which is determined taking into account the climatic features of a particular region (Wsp):
— for cities located in the north, it is approximately 1.5-2 kilowatts;
- for those, who located in the south- 0.7-0.9 kilowatts;
- And for the cities of the Moscow region- 1.2-1.5 kilowatts.
The area of the heated room is indicated by the letter S.

Below is the calculation formula:

Important! There is also a simpler way of such calculations, in which Wsp will be equal to one. Consequently, the power of the boiler will become 10 kilowatts per 100 square meters. But if you do everything in this way, then another 15% must be added to the final result, so that the value is more objective.

Table of power and heating costs

Sample calculation

As we found out, the formula for calculating the power of a heating boiler is very simple. But we will still give one example of its practical use.

We have the following conditions. The area of the room to be heated is 100 square meters. Our region is Moscow, therefore, the specific power will be 1.2 kilowatts. If we put all this into our formula, we get the following data.

How to calculate the power of various types of boilers

How efficient a heating system is will primarily depend on what type it is. And, of course, it will be influenced by the correctness of the calculations made regarding the required power of the heating boiler. If such calculations show biased data, then inevitable problems will await you in the near future.

If the heat output of the device is less than the required minimum, then in winter it will be cold in the house. If its performance is excessive, then this will not lead to anything other than to waste energy, and therefore your money.

In order to avoid such troubles, you only need knowledge regarding how the boiler power is calculated. Also consider the fact that there are different types of heating, depending on the fuel used. Here they are:

On solid fuel.
Electrical.
On liquid fuel.
Gas.

When choosing a particular system, people are often based on the characteristics of a particular region, as well as on the cost of equipment.

Solid fuel boilers

Relatively low popularity.
The need for additional space for storing fuel.
Availability.
The operating procedure is very economical.
Such boilers can function autonomously, at least most modern appliances provide for this.

In addition, another factor to take into account when calculating the power of a heating boiler is that the temperature is obtained cyclically. In other words, in a room heated by such a system, the temperature during the day can fluctuate with a gap of 5 degrees.

Important! It is for this reason that solid fuel boilers can hardly be called the best, and if possible, it is better to refuse to buy them altogether. But if this is not possible, you have two ways to partially protect yourself from such problems.

Use, the volume of which can reach 10 cubic meters. They are connected to the heating system and significantly reduce heat loss, which has a positive effect on heating costs.
Build a thermal bulb necessary to control the air supply. Thanks to him, the burning time is increased, and the number of fireboxes, therefore, is reduced.

Due to all this, the performance of the boiler you need is reduced. Also, all this should be taken into account in the calculations.

Electric boilers

All boilers powered by electric energy are distinguished by the following features.

They are compact.
Fuel for them - electricity - is expensive.
It is extremely easy to manage them.
If there is a network outage, there may be problems with their functioning.
They are environmentally friendly.

Actually, this is all you need to remember when calculating the required power for a boiler that runs on electricity.

Oil boilers

Now let's talk about liquid fuel boilers. In general, they are characterized by the following features.

Such boilers are not environmentally friendly.
They use a very expensive type of fuel.
Another feature is increased fire safety.
When installing them, you must take care of another room in which fuel will be stored in the future.

This is where the features of liquid fuel boilers ended.

gas boilers

The last type of boilers that we will talk about today are gas appliances. For the most part, they are the best option when installing a heating system. It is impossible to calculate the power of heating boilers of this type without taking into account the following features.

The operation of such boilers is simple and convenient.
They are economical.
They do not require additional space in order to store fuel.
The cost of the fuel itself for them (gas) is relatively low.
Finally, their operation is characterized by increased safety.

Everything, we have more or less figured out the boilers, now we will discuss how to calculate the power for radiators in the heating system.

How is the power of radiators calculated?

Let's assume that you, for example, intend to install heating radiators with your own hands. Of course, they must first be purchased. Moreover, when buying, you should choose exactly the model that suits you best.

All calculations regarding radiators are also quite simple. As an example, we will consider a room whose area will be 14 square meters and a height of 3 meters.

As a conclusion

So you and I found out how the power of the heating boiler is correctly calculated, including radiators here. If you strictly follow these tips, then in the end you will have a very efficient heating system, which at the same time will not be “wasteful”. That's all, good luck and warm winters!

One of the main components of comfortable housing is the presence of a well-thought-out heating system. At the same time, the choice of the type of heating and the required equipment is one of the main questions that need to be answered at the design stage of the house. An objective calculation of the heating boiler power by area will eventually allow you to get a completely efficient heating system.

We will now tell you about the competent conduct of this work. In this case, we consider the features inherent in different types of heating. After all, they must be taken into account when carrying out calculations and the subsequent decision to install one or another type of heating.

Basic calculation rules

At the beginning of our story on how to calculate the power of a heating boiler, we will consider the quantities used in the calculations:

room area (S);
specific power of the heater per 10 m² of heated area - (W sp.). This value is determined adjusted for the climatic conditions of a particular region.

This value (W beats) is:

for the Moscow region - from 1.2 kW to 1.5 kW;
for the southern regions of the country - from 0.7 kW to 0.9 kW;
for the northern regions of the country - from 1.5 kW to 2.0 kW.

The power calculation is carried out as follows:

W cat. \u003d (S * Wsp.): 10

Advice! For simplicity, a simplified version of this calculation can be used. In it Wud.=1. Therefore, the heat output of the boiler is defined as 10kW per 100m² of heated area. But with such calculations, at least 15% must be added to the obtained value in order to get a more objective figure.

Calculation example

As you can see, the instructions for calculating the heat transfer intensity are simple. But, nevertheless, we will accompany it with a concrete example.

The conditions will be as follows. The area of heated premises in the house is 100m². Specific power for the Moscow region is 1.2 kW. Substituting the available values into the formula, we get the following:

W boiler \u003d (100x1.2) / 10 \u003d 12 kilowatts.

Calculation for different types of heating boilers

The degree of efficiency of the heating system depends primarily on the correct choice of its type. And of course, from the accuracy of the calculation of the required performance of the heating boiler. If the calculation of the thermal power of the heating system was not carried out accurately enough, then negative consequences will inevitably arise.

If the heat output of the boiler is less than required, it will be cold in the rooms in winter. In the case of excess productivity, there will be an overexpenditure of energy and, accordingly, the money spent on heating the building.

To avoid these and other problems, it is not enough just to know how to calculate the power of a heating boiler.

It is also necessary to take into account the features inherent in systems using different types of heaters (you can see a photo of each of them later in the text):

solid fuel;
electric;
liquid fuel;
gas.

The choice of one or another type largely depends on the region of residence and the level of infrastructure development. Equally important is the availability of the possibility of acquiring a certain type of fuel. And, of course, its cost.

Solid fuel boilers

The calculation of the power of a solid fuel boiler must be made taking into account the features characterized by the following features of such heaters:

low popularity;
relative accessibility;
the possibility of autonomous operation - it is provided in a number of modern models of these devices;
economy during operation;
the need for additional fuel storage space.

Another characteristic feature that should be taken into account when calculating the heating power of a solid fuel boiler is the cyclicity of the temperature obtained. That is, in rooms heated with its help, the daily temperature will fluctuate within 5ºС.

Therefore, such a system is far from the best. And if possible, it should be abandoned. But, if this is not possible, there are two ways to smooth out the existing shortcomings:

The use of a thermal bulb needed to control the air supply. This will increase the burning time and reduce the number of furnaces;
The use of water heat accumulators, with a capacity of 2 to 10m². They are included in the heating system, allowing you to reduce energy costs and, thereby, save fuel.

All this will reduce the required performance. Therefore, the effect of the application of these measures must be taken into account when calculating the power of the heating system.

Electric boilers

They are characterized by the following features:

high cost of fuel - electricity;
possible problems due to network outages;
environmental friendliness;
ease of management;
compactness.

All these parameters should be taken into account when calculating the power of an electric heating boiler. After all, it is not purchased for one year.

Oil boilers

They have the following characteristic features:

not eco-friendly;
convenient in operation;
require additional storage space for fuel;
have an increased fire hazard;
use fuel, the price of which is quite high.

gas boilers

In most cases, they are the best option for organizing a heating system. have the following characteristic features that must be taken into account when calculating the power of the heating boiler:

ease of operation;
do not require a place to store fuel;
safe in operation;
low cost of fuel;
economy.

Calculation for heating radiators

Let's say you decide to install a heating radiator with your own hands. But first you need to buy it. And choose exactly the one that suits the power.

First, we determine the volume of the room. To do this, multiply the area of the room by its height. As a result, we get 42m³.
Further, you should know that it takes 41 watts to heat 1m³ of a room in central Russia. Therefore, to find out the desired performance of the radiator, we multiply this figure (41 W) by the volume of the room. As a result, we get 1722W.
Now let's calculate how many sections our radiator should have. Make it simple. Each element of a bimetallic or aluminum radiator has a heat transfer of 150W.
Therefore, we divide the performance we obtained (1722W) by 150. We get 11.48. Round up to 11.
Now you need to add another 15% to the resulting figure. This will help smooth out the increase in required heat transfer during the most severe winters. 15% of 11 is 1.68. Round up to 2.
As a result, we add 2 more to the existing figure (11). We get 13. So, to heat a room with an area of 14m², we need a radiator with a power of 1722W, which has 13 sections.

Now you know how to calculate the desired performance of the boiler, as well as the heating radiator. Take advantage of our advice and provide yourself with an efficient and at the same time not wasteful heating system. If you need more detailed information, then you can easily find it in the corresponding video on our website.

One of the first parameters that people pay attention to when choosing heating equipment is performance. The calculation of the power of a gas heating boiler is performed in several ways. Comfort during operation depends on accurate calculations.

How to choose the power of a gas boiler

The calculation of the power of a gas heating boiler from the area is carried out in three different ways:

European manufacturers often calculate the performance of boiler equipment from the volume of the room. Therefore, in the technical documentation, the possibility of heating in m³ is indicated. This factor is taken into account when choosing a unit manufactured in the EU countries.

Most consultants who sell heating equipment independently calculate the required performance using the formula 1 kW = 10 m². Additional calculations are carried out according to the amount of coolant in the heating system.

Calculation of a single-circuit heating boiler

As noted above, independent calculations of the operating parameters of heating equipment are performed according to the formula 1 kW \u003d 10 m². To the result obtained, 15-20% of the reserve is added, due to which the heat generator, even in severe frosts, does not work at full load, which prolongs its service life.

For 60 m² - the unit will be able to satisfy the need for heat on 6 kW + 20% = 7.5 kilowatts. If there is no model with a suitable performance size, preference is given to heating equipment with a large power value.
In a similar way, calculations are made for 100 m² - the required power of boiler equipment, 12 kW.
For heating 150 m², a gas boiler is needed, with a capacity of 15 kW + 20% (3 kilowatts) = 18 kW. Accordingly, for 200 m², a 22 kW boiler is required.

These calculations are only suitable for single-circuit models that are not connected to an indirect heating boiler.

How to calculate the power of a double-circuit boiler

The formula for calculating the required power of a double-circuit gas boiler in terms of the heating area and hot water draw-off points is as follows, 10 m² = 1 kW + 20% (power reserve) + 20% (for water heating). It turns out that 40% is added immediately to the calculated performance.

The power of a double-circuit gas boiler for heating and hot water heating for 250 m² will be 25 kW + 40% (10 kilowatts) = 35 kW. Calculations are suitable for two-circuit equipment. To calculate the performance of a single-circuit unit connected to an indirect heating boiler, a different formula is used.

Calculation of the power of an indirect heating boiler and a single-circuit boiler

To calculate the required power of a single-circuit gas boiler with an indirect heating boiler, you must perform the following steps:

Determine what volume of the boiler will be sufficient to meet the needs of the residents of the house.
In the technical documentation for the storage tank, the required capacity of the boiler equipment is indicated in order to maintain the heating of hot water, without taking into account the necessary heat for heating. A 200 liter boiler will require an average of about 30 kW.
The performance of the boiler equipment required for heating the house is calculated.

The resulting numbers are added up. The amount equal to 20% is subtracted from the result. This must be done for the reason that the heating will not simultaneously work for heating and DHW. The calculation of the thermal power of a single-circuit heating boiler, taking into account an external water heater for hot water supply, is done taking into account this feature.

What power reserve should a gas boiler have

The performance margin is calculated depending on the configuration of the heating equipment:

For single-circuit models, the margin is about 20%.
For two-circuit units, 20% + 20%.
Boilers with connection to an indirect heating boiler - in the storage tank configuration, the required additional performance margin is indicated.

The specified power reserve is valid for rooms up to 300 m². Houses with a larger area require competent thermal engineering calculations.

Calculation of gas demand based on boiler power

The formula for calculating gas consumption, depending on the power of the boiler used, takes into account the efficiency of the heating equipment. For standard models of classical heating heat generators, the efficiency will be 92%, for condensing ones up to 108%.

In practice, this means that 1 m³ of gas is equal to 10 kW of thermal energy, assuming 100% heat transfer. Accordingly, with an efficiency of 92%, fuel costs will be 1.12 m³, and at 108% no more than 0.92 m³.

The method for calculating the volume of consumed gas takes into account the performance of the unit. So, a 10 kW heating device, within an hour, will burn 1.12 m³ of fuel, a 40 kW unit, 4.48 m³. This dependence of gas consumption on the power of boiler equipment is taken into account in complex heat engineering calculations.

The ratio is also built into the online heating costs. Manufacturers often indicate the average gas consumption for each model produced.

In order to fully calculate the approximate material costs of heating, it will be necessary to calculate the electricity consumption in volatile heating boilers. At the moment, boiler equipment operating on main gas is the most economical way of heating.

For heated buildings of a large area, calculations are carried out only after an audit of the heat loss of the building. In other cases, when calculating, they use special formulas or online services.

How not to make a mistake and correctly choose a device so as not to freeze and not to thin the budget - read on. From the article you will find out which technique will be correct and necessary for you.

Calculation of heat losses at home

We say right away - there is no single method for calculating the coefficient. The setting varies depending on your climate. It is all the more important to pay more attention to this stage of preparation. Even a specialist will not determine by eye, without calculations, information on the required boiler power. Even low-power ones, such as, can heat an average apartment up to 65m². But what it exactly should be - it will become known after filling out a special questionnaire - the document is freely available, anyone can fill it out on the Internet.

Experts approached the compilation of the questionnaire responsibly. By filling in the fields, you will not be able to make a mistake. The only exception is the incorrect filling of the online form. All other calculations of the boiler for the house will be performed by the program.

So, here are the questions you need to be prepared for - specify:

1. Heat loss through walls

This parameter is affected by the area of the facade and the ventilated layer (walls are with it, and sometimes without it). The first wall covering is the paramount criterion, without which it will be too risky to choose a heating boiler. Reinforced concrete or foam concrete, mineral wool, drywall, plywood or wood - the material affects the decision of what power to buy solid fuel equipment. The thickness of the first layer of the house is also important. For thin-walled houses, buy a medium power boiler - for example,.

2. Heat loss through windows

Important condition. It is logical that more heat will "leave" with a single-chamber double-glazed window than with two-chamber ones. The area of windows is also important when calculating the power of the boiler. Before filling out the questionnaire, measure it again.

3. Heat loss through ceiling and floor

As you understand, in a room with an attic and an unheated basement, you need to install powerful equipment - like. Incorrectly selected power of the device will spoil several winter months spent in a country house - heating is clearly not enough for a comfortable life.

Useful to know:

If you do everything right, your efforts will be rewarded with a profitable investment in the purchase. Consider that you have coped with the task - most likely, you will get the best result in terms of price and quality.

Why is it important to accurately determine the power of the boiler

The first thing that comes to mind is saving money on a purchase. For this alone, it is worth spending a couple of hours on calculations. Given the good work and efficient operation of the boiler, the calculation of the power of the equipment becomes even more necessary.

Here are some unhappy scenarios that will inevitably unfold if you do not take into account the above.

Remember: The correction for the region for our climate is a factor of 1.2.

An incorrect calculation of the power of a not so popular, but still occurring pellet device (for example) and a wood-fired boiler is the first choice parameter. To calculate the parameter, do not be too lazy to spend time, otherwise you cannot avoid the above problems in the lack of heat (if we are talking about weak appliances) or inefficient waste of fuel (when you pick up an expensive and too powerful boiler, like).

Determining the power of the boiler is the most important stage of work

So you got acquainted with the theoretical part of the question, having received information about the importance of calculating the power of boilers. Now it's time to move on to the practical part - the most important. As an option, a specialist responsible for the calculation of parameters and installation. But you yourself can find out what technique is really needed.

When calculating power, we start from the area of \u200b\u200bthe heated object - it is she who will help to evaluate performance. Keep in mind that with a room height of 2.7 m (and such ceilings are in almost all houses), it takes 1 kW to heat 10 m².

This ratio is approximate. It is influenced by the climate of the region and, again, the height of the ceilings, the presence of basements, etc.

Advice: in order to calculate the power of an ideal boiler for high ceilings, it is necessary to determine the correction factor by dividing the parameter by the standard 2.7m.

Example:

The ceilings are 3.1m.
We divide the parameter by 2.7 - we get 1.14.
So, for high-quality heating of a house of 200 m² with ceilings of 3.1 m, a boiler with a capacity of 200 kW * 1.14 = 22.8 kW is useful.
In order not to freeze for sure, we recommend rounding the parameter up. Then get 23kW. We are suitable for 24 kW.

Please note that this calculation is suitable for a single-circuit boiler. In the case of c, you need to calculate what water temperature you want to get in the cold, and choose a technique in accordance with the parameter (+ 25%, power, if you like hot water).

Step-by-step calculation of boiler power (double-circuit) for apartments

With apartments, the situation is somewhat different. Here the coefficient is less than in the house - in apartments there is no heat loss through the roof (if we are not talking about the last floor) and losses through the floor (except for the first floor).

if another room "warms up" the apartment from above, the coefficient will be 0.7
if there is an attic above you - 1

To calculate the parameter, we use the technique indicated above, taking into account the coefficient.

Example: The area of the apartment is 163m². Its ceilings are 2.9 m, the apartment is located in our lane.

We determine the power in five steps:

We divide the area by the coefficient: 163m² / 10m² = 16.3 kW.
Do not forget about the correction for the region: 16.3 kW * 1.2 = 19.56 kW.
Since the double-circuit boiler is designed for hot water, we add 25% 7.56 kW * 1.25 = 9.45 kW.
And now do not forget about the cold (experts advise adding another 10%): 9.45 kW * 1.1 \u003d 24.45 kW.
We round up, and it turns out 25 kW. It turns out that it will suit us - a device that runs on natural gas and interacts with solar collectors.

Please note that in this way the power of the boilers is calculated, no matter what fuel they operate on - even gas, even electricity, even solid fuel. .

Step-by-step calculation of the power of the boiler (single-circuit) for an apartment

But what if you do not need a double-circuit boiler, and with tasks? We will make calculations, taking into account one more factor - the material of manufacture of the house. The norm of heating established at the legislative level looks like this:

Heating 1m³ in a panel house will require 41 watts.
Heating 1m³ in a brick house will require 34 watts.

We invite you to familiarize yourself with:

We remember the area of the apartment, multiply it by the height of the ceilings, we get the volume. This indicator must be multiplied by the norm - we get the power of the boiler.

Example:

You live in a 120m² apartment with 2.6m ceilings.
The volume will be as follows: 120m² * 2.6m = 192.4m³
We multiply by the coefficient, we calculate the need for heat 192.4m³ * 34W = 106081W.
We translate into kilowatts and rounding up, we get 11kW. This is the power that a thermal single-circuit unit should have. A good option is the model. A little "with a margin", the power of this technique is more than enough for a comfortable microclimate in your home.

As you can see, the task of selecting a boiler will not take more than an hour. By choosing the right heating device, you will insure yourself against uncomfortable cold weather for the whole winter, saving money on the purchase of a boiler and utilities. Correctly calculate the parameter - it is equally important for all types of heaters: coal, TT,

The main question that arises when it is necessary to install autonomous heating at home is how to calculate the power of a gas boiler so that it is comfortable in residential premises in winter, and at the same time avoid unnecessary costs. It would be an erroneous opinion that you can choose a boiler without calculation, simply by installing a unit with a large power reserve, since all modern heat generators are equipped with automation systems that allow you to regulate fuel consumption. However, the installation of a boiler unit, the capacity of which will exceed the actual heat demand, will, firstly, lead to additional costs for the purchase of the boiler itself and related components, and secondly, to its inefficient operation, which can cause automation failures and increased equipment wear.

For large objects, boiler units are selected by designers based on complex calculations, but for low-rise private houses this can be done independently using simplified methods.

Boiler power calculation

Wall-mounted boiler with piping

The calculation of the power of a gas boiler using simplified methods can be made both for an apartment or a house built according to a standard project, and for a private house built according to an individual project.

Calculation for a typical house

For a simplified calculation of the boiler power for a typical house, we proceed from the norm of the required specific heat output of the boiler Um = 1 kW / 10 m2, which means that 1 kW of thermal energy is required to maintain a comfortable temperature in a room of 10 m2. The calculation does not take into account the volume of premises, since in all houses built according to standard projects, the height of the premises does not exceed 3 meters.

The formula for calculating the power of the boiler unit is as follows:

Rm \u003d Um x P x Kr

P - the sum of all areas of heated premises;
Кр is a coefficient that takes into account the climatic features of the regions.

Since in Russia the climate in the regions is significantly different, a correction factor Kr is introduced, the value of which is taken:

for the regions of the south of Russia - 0.9;
for the regions of the middle zone - 1.2;
for the Moscow region - 1.5;
for the northern regions - 2.0.

For example, for an apartment or house with a total area of 120 m2, located in the Moscow region, the required boiler capacity will be:

Rm \u003d 120 x 1.5 / 10 \u003d 18 kW

The example shows the calculation for a boiler used for heating purposes only. In the case when it is necessary to calculate the power of a two-circuit unit, intended, in addition to heating, and for hot water supply, the power obtained by the formula should be increased by about 30%. In this case, the optimal boiler power will be: 18 x 1.3 = 23.4 kW. Since the capacities of the boilers offered by manufacturers are given in whole numbers, you should choose a unit with the closest power to the calculated indicator - 25 kW.

Calculation of boiler power for an individual house

Heating system of a private house

The calculation of the power of a gas boiler for a house built according to an individual project is more accurate, since it takes into account the height of the premises and some other parameters. The calculation is made according to the formula:

Rm \u003d Tp x Kz

Rm - the required design power of the boiler unit;
Tp - possible heat losses of the building;
Kz - safety factor, taken within 1.15-1.2.

In turn, the value of the possible heat loss of the building is calculated by the following formula:

Tp \u003d Oz x Rt x Kr

Oz - the total volume of heated premises of the house;
Рт - temperature difference between outdoor air and indoor air;
Кр is a coefficient that takes into account the dissipation of thermal energy and depends on the type of enclosing structures of the house, the type of filling of window openings, and the degree of insulation of the building.

The value of the dispersion coefficient is taken for:

buildings with a low degree of thermal protection, the walls of which, for example, are made of brick without a layer of insulation with standard wooden windows, equal to 2.0-2.9;
for buildings with an average degree of thermal protection, double walls with insulation, a small number of windows, equal to 1.0-1.9;
for houses with a high degree of thermal protection - insulated floors, double-glazed windows, wooden frame windows, made of timber or logs, etc., equal to 0.6-0.9.

For example, for a house with an average degree of thermal protection, a total volume of heated premises of 630 m and indoor air 45 (calculated as the difference between the standard temperature in residential premises, taken equal to 20 degrees, and the temperature of the coldest period of the year according to SNiP for a given region, for example, 25 degrees below zero), the amount of heat loss will be equal to:

Tp \u003d 630 x 45 x 1.0 \u003d 28350 W.

The design power of the boiler will then be:

Rm \u003d 28.35 x 1.2 \u003d 34 kW

Calculation of boiler power using a calculator on the manufacturer's website

Online calculator

Many manufacturers or companies that sell heating equipment offer online calculators on their websites. Usually, for such a calculation, you simply need to enter the following parameters into the calculator program:

the temperature to be maintained in the house;
outside air temperature during the coldest period of the year;
the need for hot water supply;
the presence of a forced ventilation system;
number of storeys of the house;
the height of the premises;
the nature of the floor structure;
parameters of external walls - from what material, is there or is there no insulation;
information about the length of each outer wall;
information about the number and size of window openings and the nature of their filling;

All this data is easy to determine on your own, and then it only remains to insert them into the relevant departments of the program and get a ready-made calculation of the boiler power.

Detailed video lesson on the calculation:

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