How to choose the boiler capacity for the house

Boiler power selection for a house of 100-200 square meters. м

To ensure a comfortable temperature in the house throughout the heating season, the boiler output should be at least a certain figure. This figure depends, firstly, on the area of the particular building and, secondly, on its heat loss. In addition, the fact that there is a hot water system should be taken into account. If it is provided by the project, the need for constant heating of water for household needs will require additional power from the heat generator.

Installing a solid fuel heater with an overdrive carries with it another problem. The fact that any boiler on solid fuel has its optimal mode of operation, in which it shows the highest efficiency. If you take a too powerful heat generator, then, in order to avoid overheating of the coolant in the heating system, it will have to operate in quiescent mode. This mode implies limiting the amount of oxygen that is fed into the combustion chamber. As a result of such work the fuel in the boiler burns less intensively and the output of heat generator decreases. However, the consequence of this mode is inevitably increased fuel consumption and reduced life of the boiler.

What types of gas boilers to choose?

There are several types of gas boilers:

  • Floor models have large dimensions, require a separate room for installation. The devices have a high power;
  • Wall-mounted boilers are often used in apartments, they are low-power and small-sized.

Boilers can also be divided into conventional and modular. With the latter you can adjust the power and save money. Some boilers are equipped with a piezo ignition.

First floor or middle floor

Here everything is the same. if you have an apartment in the middle of the house, you do not lose on heating the floor and ceiling! If the first or last floor. then you need to heat more, that is, the warming of the floor or ceiling.

If you are on the first floor, make additional insulation. Often you can put expanded clay, or other insulation that effectively keeps heat. You can also put insulation on the ceiling and put a stretch ceiling on top.

How to calculate for homes of different sizes

Here are ways to calculate for homes with different areas.

60 sq. m

To calculate the boiler capacity for a house of 60 square meters, you can use a calculator or data SNIP, paste in the above formula. According to the classic formula, 6 kilowatts is enough. Taking into account the coefficient of heat loss and climate, this number can be from 7 to 10 kilowatts. For example, in the South 7 kilowatts is enough for heating, but in the North that figure can go up to 10 kilowatts. If the house is not insulated or this is done poorly according to the thermal imaging camera, you should add another 1 kilowatt to the total value.

These values are for a single boiler. As for the two-circuit unit, it is necessary to take a device for the south of 25 kW, and for the north. 30 kW.

80 square metres

For a house or apartment of 80 square meters with standard ceilings 8-10 kilowatts of thermal energy is enough.

For the living space, located in the south of Russia, this figure can be exactly 8 kW. For an apartment or house in a semi-basement, where the temperature decreases below.10 degrees, you need to buy a boiler with a capacity of 12-14 KW.

choose, boiler, capacity, house

120 sq. m

For a dwelling with 120 square meters, about 12 kilowatts will be enough. It is important to consider the number of windows, doorways, ceiling height and climate. This figure may vary by 1-3. In addition, for those who like warmth in the house, namely the temperature of 26 degrees, you can add another 1 kilowatt.

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Please note! In places close to the south of Russia, to heat an insulated two-story house with a basement will be enough 12 kilowatts. As for the north and central strip, this value grows by 2-3 kW.

200 sq.m

For an accurate calculation of the required capacity of electric boilers for heating a 200 square meter house, you can use a special online calculator. As a rule, with average indicators, you need to choose a unit with a capacity of 13-15 kilowatts. If we are talking about choosing a two-circuit unit, you will need to take an electric boiler for heating a house of 200 square meters at 25-27 kilowatts.

300 sq.m

As in the case of an area of 200 square meters, you can calculate the capacity of the boiler for home and water heating by using an online calculator or use the universal formula above.

For the average strip of Russia will need to pick up a boiler with a capacity of 30-35 kilowatts. There are already ready models for which you do not need a preliminary calculation.

How to choose a boiler on solid fuel (example)

If the need to heat a house with an area of 200 m. sqm, the boiler capacity will be determined this way:

Boiler power with reserve, 20 kW 1.2 = 24 kW.

It turns out that for heating the house with area of 200 m. sqm. A solid fuel boiler with a capacity of 24 kW is needed.

Depending on the power range of the particular boiler manufacturer, it is likely to be a 25 kW boiler.

If the ceiling height is more than three meters, you need to consider the boiler capacity by volume of. In this case it is assumed that 1 kW. boiler output will heat 30 m. cube.

Using the example of a room with an area of 200 m. kv. With a ceiling height of 3.5 m. the calculation will be as follows:

Room volume 2003.5=700 m. cubic.

Needed boiler output, taking into account the reserve of 23,320% = 28 kW.

Most likely it will be a 30 kW boiler.

By the way, we have developed an interactive calculator to select the capacity and model of the boiler, they can be used here: ecoklimat.com.ua/podbor-moshhnosti-kotla

If the heating system is complex and the boiler will work, for example, for heating, warming hot water and, for example, swimming pool, then you need to contact experts who, with a more complex calculation determine the required boiler power.

choose, boiler, capacity, house

If the house is well insulated, for example, foam concrete walls plus 100 mm. Foam or mineral wool, then the power reserve can be taken at the level of 10-15%. And vice versa, if the insulation is bad you need to increase the power reserve (up to 30%).

Do not, just as, and add too much power margin. In this case, the boiler will heat the system very quickly and stay in the standby mode more than in the “work” mode. In this case, the burning time at one load will be longer, but the fuel consumption will be higher, t.к. The boiler has a large combustion chamber.

If you pick up a pyrolysis boiler, it can be selected according to the same methodology, but it is obligatory to install a three-way valve (hydrostring). Or calculate the heat loss more accurately and do not take such a large power reserve.

How to choose the boiler on solid fuel (example)

If you want to heat a house with area of 200 sq.m., the area of the boiler is 200 sq.m. sq.m., then the boiler capacity will be determined in this way:

Boiler power with reserve, 20 kW 1.2 = 24 kW.

It turns out that to heat the house with an area of 200 m. kv. You need a solid fuel boiler with the power of 24 kW.

Depending on the power line of the boiler manufacturer, the boiler output is likely to be 25 kW.

If the ceiling height is more than three meters, you need to consider the boiler output by volume of the room. In this case it is assumed that 1 kW. The boiler output will heat 30 m. cc.

Using the example of a room with an area of 200 m. sq.m. With 3.5 m high ceilings. calculation will be as follows:

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The volume of the room 2003.5=700 m. cube.

The required boiler power, taking into account the stock 23,320% = 28 kW.

It is likely to be a boiler capacity of 30 kW.

By the way, we have developed an interactive calculator for selecting the capacity and model of the boiler, they can be used here: ecoklimat.com.ua/podbor-moshhnosti-kotla

If the heating system is complex and the boiler will work, for example, for heating, warming hot water and, for example, a pool, then you need to contact experts who, with a more complex calculation will determine the required boiler power.

If the house is well insulated, for example, the walls of foam concrete plus 100 mm. foam or mineral wool, then the power reserve can be taken at the level of 10-15%. And on the contrary, if the insulation is bad, you need to increase the power reserve (up to 30%).

Do not, as well, add too much power reserve. In this case, the boiler will heat the system very quickly and stay in the stand-by mode more than in the “operation” mode. In this case the burning time at one load will increase, but its fuel consumption will be higher, t.к. Boiler has a large combustion chamber.

If you select the pyrolysis boiler, it can be selected according to the same methodology, but it is obligatory to install a three-way valve (hydrostring). Or calculate the heat loss more accurately and do not take such a big power reserve.

What gas boiler to choose for heating a private house?

The most optimal and economical source of heating of a country house is still a gas boiler.

On our market there are a lot of manufacturers of such products. Bosch, Buderus, Viessmann, Vaillant, Baxi, Navien, etc.д.

In addition, there are single-circuit and double-circuit models, traditional and condensing, wall and floor, with open and closed chamber. Which one to choose and what technical issues you should pay attention to besides the brand?

Let us help you understand this business to avoid irreparable mistakes when buying.

Currently, the project for the electricity supply of the building does not cause anyone any questions. It is considered as a matter of course.

Hence the problems with the correct selection of the capacity of the gas boiler, and then with its operation.

The most popular of them is to divide the total area of the house by 10 square meters. The result is allegedly the calculated value.

The thickness and material of the walls, size, number and type of windows, doors, attic, etc. are not taken into account.п.

If you want to know the average power without a project, use at least online calculators. Choose the one that requires the maximum number of parameters.

But still, for a comfortable and peaceful life initially lay in your expenses a separate amount for the heat supply project. In the same should be developed a scheme of all the heating and calculated the heat loss of the house.

When people first see a boiler nameplate with a capacity of 24kW or more, they are startled.

Do not confuse the electrical and thermal capacity of heating devices. The gas boiler, at its worst, consumes no more than 150-200W per hour from the socket.

That’s why the usual batteries with inverter or so-called UPS are enough to power it in the period of blackout.

We are not talking about any kilowatts here.

And therefore, it is economically unprofitable to take a gas boiler with reserve. This is not always true.

First of all, the problem concerns the “stupid” floor standing and obsolete mounted boilers.

Here is how the diagram of 20 kW and 30 kW of appliance looks conventionally.

On the vertical line we have the gas flow rate, on the horizontal line. the operating time. Above are drawn two modes, the so-called clocking. At the bottom. the mode of comfortable operation with constant power in case of frost.

Usually, the cycling is observed in the off-season, when there is no heavy frost and there is no need to warm up the system for a long time.

In this situation, the boiler starts at maximum, quickly heats the water and turns off. Further the pump distributes the heat carrier through the system, the temperature drops, the burners are started again.

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In this mode, both the 20kW and 30kW boiler works. What is the difference??

And the difference is that the first will consume gas in the intervals of start-up conditionally 2m3, and the second 3m3. When the boiler stalls, it does not have time to evaluate anything and reach the optimum output.

It starts at maximum and stops at maximum. But all this concerns old, “dumb” models.

In modern wall mounted appliances with modulating burners (1:10) and smart electronics, the boiler is arranged so that if the automation initially sees the overheating of the coolant, the next switching on will occur at a lower power, or you can reduce it yourself.

The only problem is when the minimum capacity of the boiler is not so minimum.

So check the manual and ask the seller whether the gas boiler has a modulation function or not. And the more frequent the adjustment step, the better.

90% of consumers have never used weather dependent automatic devices or GSM modules in their lives. Do not overpay for them.

It is better to put a couple of smart and inexpensive room thermostats.

Electric boilers: properties and advantages

The analysis of the advantages makes it possible to assess the rightness of the purchase of a particular product. In addition to the features of each specific model, it is worth paying attention to the advantages of these small and compact units in general.

Among the undoubted advantages of electric boilers are:

  • Small weight and compact size, which allows you to fix it in a convenient place;
  • modern automation, which perfectly protects the unit from power surges and turns it off automatically in case of failure;
  • An elaborate system of sensors and indicators, allowing you to easily navigate to the problem;
  • low noise level;
  • complete fire and electrical safety;
  • affordable price.

Electric boiler does not need regular maintenance. It is enough to carry out preventive maintenance once a year. Such a unit does not need a chimney and it is easier to connect than a gas boiler.

To select and purchase an electric boiler from a variety of models is quite difficult. The range is very wide, and includes units from over 20 manufacturers with different characteristics. Therefore, in order to understand how to choose an electric boiler. it is necessary to understand the principle of its work.

Roughly

For a simplified calculation of the boiler power, when you need to approximately “estimate” the price of the equipment, you can take the value of heat loss of 100 W/m.kv. Actually, most sellers in the selection of the boiler take exactly this parameter. For example, for a house with the area of 150 sq. м. You need a heating boiler of 15 kW or more. But for the final decision, this option is not very good, because there is a high probability of buying a boiler with over- or underpowered.

It is so important to buy a heating boiler of appropriate capacity? Important!

With overdimensioned output

The boiler has a “fork” in power. minimum and maximum. If you take a boiler with an inflated output, the boiler will overshoot at a low heat demand. The gas boiler will beat (turn on / off often), solid fuel boiler. operate on overheating, will emit heat into the air. If you reduce the boiler output from the nominal, the efficiency falls, and if it is also imposed overpowering In addition, the equipment at more kW and costs more.

When underpowered

If you buy a boiler with low output, the owner runs the risk of being in a cold house in the winter at subzero temperatures. The device simply will not be able to compensate for all body losses. In addition, working at the limit, reduces the life of the boiler. With an average heat demand, it will quite provide a comfortable temperature in the house.

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