Number of kW per segment of cast iron radiator

Another article in the heading - "Consumption of the apartment." So, as the heating season has already begun, many are interested in the power of their batteries. Indeed, the heat in the room and in the apartment as a whole depends on the power (you need to know this when calculating heating radiators at the level of designing a heating system). Today I will talk about the power of 1 section of a cast iron radiator ...

Cast iron radiators come in various brands, but there are not so many of them and they can be listed on one hand. Everything else is just a variation of them. Today the most basic.

The classic and most common radiator is installed in many apartments in our country, as well as in many post-Soviet countries. Section width 140 mm, height (between supply pipes) 500 mm. Additional marking MC 140 - 500. The power of 1 section of this radiator is 175 W of thermal energy.

However, there are many variations of this radiator

The most energy efficient version of the MC 140 radiator. The point is that additional cast iron ribs are installed between the sections, which also provide additional heating to the room. The power of such a radiator is 195 W of thermal energy (which is 20 W more than that of the classic MC 140). However, such radiators have a significant drawback, you need to monitor the frequency of these fins, if they get clogged (for example, with dust), then the thermal efficiency drops by 30 - 40 W!

As the name implies, this radiator has the same width of 140 mm, but the height is only 300 mm. This is a compact type of radiator. The power of one section is only 120 W of thermal energy.

MC 90 - 500

A less common radiator, but cheaper than the previous model. The width of one section is 90 mm (more compact), the height is the same 500 mm, hence the name. Less efficient than MC 140, the power of one section of such a radiator is about 140 W of thermal energy.

Cast iron radiator 110 mm wide and 500 mm high between pipes. Relatively rare, it was not staged very often. Power of one section, about - 150 W

Relatively new development, changed shape. The radiator has a section width of 100 mm and a height (between the supply pipes 500 mm). Thermal power of one section - 135 - 140 W.

It is not rare now that you can see modern cast-iron radiators, produced by both import companies and our domestic ones. In appearance they are somewhat similar to aluminum radiators. The power of 1 section of such a radiator ranges from 150 to 220 W, much depends on the size of the radiator.

And that's all, I think I gave you the layout of the usual cast-iron radiators. Of course, the power can jump a little from manufacturer to manufacturer, but approximately the power is kept within these limits.

Heating radiator models and locations are selected at the stage of planning a house or apartment. Owners of private houses have to make this choice on their own. Unfortunately, for the majority of apartment residents, this issue is resolved by developers. It is much more difficult to heat a panel apartment. Heat transfer from cast iron radiators plays an important role

in the choice of such devices. What type of device should you choose: aluminum, bimetallic or cast iron?

It is not surprising that when choosing, rarely anyone is guided by effective indicators of devices and economic characteristics. Choosing the most affordable device from a price point of view is not very correct. To begin with, it is recommended to pay attention to such an indicator as the heat transfer of heating radiators.

This will depend on the type and quality of the material used in the manufacture of the radiators.The main varieties are:

• cast iron;
• bimetal;
• made of aluminum;
• of steel.

Each of the materials has some disadvantages and a number of features, therefore, to make a decision, you will need to consider the main indicators in more detail.

Made of steel

They function perfectly in combination with an autonomous heating device, which is designed to heat a substantial area. The choice of steel heating radiators is not considered an excellent option, since they are not able to withstand significant pressure. Extremely resistant to corrosion, light and satisfactory heat transfer performance. Having an insignificant flow area, they rarely clog. But the working pressure is considered to be 7.5-8 kg / cm 2, while the resistance to possible water hammer is only 13 kg / cm 2. The heat transfer of the section is 150 watts.

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Steel

Made of bimetal

They are devoid of the disadvantages that are found in aluminum and cast iron products. The presence of a steel core is a characteristic feature, which made it possible to achieve a colossal pressure resistance of 16 - 100 kg / cm 2. The heat transfer of bimetallic radiators is 130 - 200 W, which is close to aluminum in terms of performance. They have a small cross-section, so over time, there are no problems with pollution. The significant disadvantages can be safely attributed to the prohibitively high cost of products.

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Bimetallic

Made of aluminum

Such devices have many advantages. They have excellent external characteristics, moreover, they do not require special maintenance. They are strong enough, which allows you not to fear water hammer, as is the case with cast iron products. The working pressure is considered to be 12 - 16 kg / cm 2, depending on the model used. The features also include the flow area, which is equal to or less than the diameter of the risers. This allows the coolant to circulate inside the device at a tremendous speed, making it impossible for sediments to accumulate on the surface of the material. Most people mistakenly believe that too small a cross section will inevitably lead to a low heat transfer rate.

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Aluminum

This opinion is erroneous, if only because the level of heat transfer from aluminum is much higher than, for example, that of cast iron. The cross section is compensated by the ribbing area. Heat dissipation of aluminum radiators depends on various factors, including the model used and can be 137 - 210 W. Contrary to the above characteristics, it is not recommended to use this type of equipment in apartments, since the products are not able to withstand sudden temperature changes and pressure surges inside the system (during the run of all devices). The material of an aluminum radiator deteriorates very quickly and cannot be recovered later, as in the case of using another material.

Made of cast iron

The need for regular and very careful maintenance. The high inertness rate is almost the main advantage of cast iron heating radiators. The heat dissipation level is also good. Such products do not heat up quickly, while they also give off heat for a long time. The heat transfer of one section of a cast-iron radiator is equal to 80 - 160 W. But there are a lot of shortcomings here, and the following are considered to be the main ones:

1. Perceptible weight of the structure.
2. Almost complete lack of ability to resist water hammer (9 kg / cm 2).
3. A noticeable difference between the cross-section of the battery and the risers. This leads to a slow circulation of the coolant and a fairly rapid pollution.

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Design features of cast iron radiators

Cast iron devices are made from an alloy of cast iron, which has high strength and is homogeneous.

Battery sections are produced separately by casting, then connected to obtain the required thermal power. The tightness of the joints is achieved by using sealing elements made of various materials.

There are three types of cast iron radiators: single-channel, two-channel and three-channel.

The principle of operation is very simple, it is as follows: the heated coolant circulates inside the device, gives off heat to its walls, which is then transferred to the surrounding air.

• Heating equipment of this type is characterized by the following features:
• Internal ribs are vertically positioned to increase the heat exchange surface;
• Good strength and ability to withstand high pressures;
• Relatively low coefficient of linear expansion of the material and high temperature resistance;
• Thermal power ranges from 100 to 150 W;
• A high degree of inertia of products, in connection with which their heating and cooling occurs rather slowly, thermoregulation practically does not make sense.

Heat transfer calculation

First of all, it is recommended to pay attention to the available data sheet, which is attached to each product of this type. In it you can find the necessary information regarding the heat output of one section of the product. These figures require significant adjustments. The heat dissipation of bimetallic radiators, like aluminum ones, has excellent power ratings, while the judgment is based on the well-known fact that copper products have an excellent heat dissipation level, just like aluminum ones. They have a high thermal conductivity, while heat transfer depends on many other factors.

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The heat dissipation of the heating radiator is multiplied by the correction factor adopted depending on the DT value

The figure indicated in the passport is correct only if the difference between the supply and processing temperatures is 70 ° C.

Using the formula, calculations are made as follows:

The instruction may have various designations. Often, only a difference of 70 ° C is mentioned and no more.

Correction factors

Despite the same values ​​in the data sheet, the actual heat dissipation of the radiators may differ depending on the operating conditions. Considering that the above formulas are accurate only for houses with average insulation indicators and for areas with a temperate climate, under other conditions it is necessary to amend the calculations.

Correction factors when calculating the number of sections of heating batteries

For this, the value obtained during the calculations is additionally multiplied by a coefficient:

• corner and north rooms - 1.3;
• regions with extreme frosts (Far North) - 1.6;
• screen or box - add another 25%, niche - 7%;
• for each window in the room, the total heat transfer for the room increases by 100 W, for each door - 200 W;
• cottage - 1.5;

Important! The latter coefficient is used extremely rarely when calculating bimetallic radiators, because such heating devices are almost never installed in private houses due to their high cost.

Bimetallic radiators

Calculation methodology

As a result, it turns out that the declared heat transfer of the batteries and the power is slightly lower than the real one, which is indicated in the documentation. For the correct choice of equipment, it is necessary to clearly understand the difference in these numbers. The components used will also play a secondary role, be it a copper or bimetallic element. To verify the data, a reduction factor should be used that is applicable to the original power rating of the device as indicated in the documentation.

The calculation is done with the following sequence:

1. To begin with, it is necessary to develop an optimal temperature regime in the premises and the main coolant.
2. Fill in the collected information and calculate the delta as the average of the indicator.
3. Find the most approximate indicator in the attached table.
4. The resulting figure is multiplied by the one given in the documentation.
5. The calculation of the required number of heating devices is made.

It is also worth considering that the heating season sometimes comes earlier than usual and the device must be ready for use. For bimetallic equipment, the calculation will be as follows: 200 W x 0.48 - 96 W. If the area of ​​the room is 10 m2, then you will need at least a thousand watts of heat or 1000/96 = 10.4 = 11 batteries or sections (rounding always goes up). In any case, there is always the opportunity to seek help from professionals who will help make the necessary calculations, and will tell you in detail how and why this is done. Good luck in your endeavors!

The main elements of a standard heating system are radiators that provide uniform heating of the premises, so their installation must be carried out in accordance with all requirements. Today, consumers have access to a varied selection of models, the differences of which are both in form and in materials of manufacture. Over time, cast iron radiators have not outlived their usefulness, and still continue to occupy stable positions in the apartments and homes of users.

This material, as before, remains one of the most reliable and durable. Taking into account the fact that modern cast iron models have changed their appearance, becoming more modern and elegant, they continue to be bought. For this reason, it is worth considering how their heat transfer should be calculated so that a constant comfortable temperature is maintained in the premises.

Power of one section of bimetallic radiator

Heat transfer of bimetallic heating radiators and its correct use

The level of costs for maintaining comfortable conditions in residential, public, office and other premises depends on the efficiency of these devices. This wording contains a mention of the importance of specific operating conditions. Nevertheless, in any case, when the correct calculation of bimetallic heating radiators is needed, it is necessary to take into account not only the capacity of the sections declared by the manufacturer. It is imperative to find out how much money and effort will have to be spent so that the heat transfer of the product is used rationally.

Heat flow and heating system: basic concepts and definitions

Any bimetallic heating radiator transfers heat to the surrounding space using the following processes:

• movement of heated air masses (convection);
• heating of surrounding objects by radiation;
• an increase in the temperature of substances during their direct contact (heat exchange).

Each of them is described by complex physical formulas and scientific theories, which in practice are used only partially. To design a heating system of any level of complexity, you need to make a calculation that will help you find out how many sections of a bimetallic heating radiator need to be used in order for this power to be sufficient.

If such calculations are made with a certain margin, then even on the coldest days in the premises the temperature required by the users will be maintained. On the other hand, a more accurate calculation will help to establish the truly necessary lower power limit, which will reduce the amount of start-up and operating costs.

How to calculate the number of sections of a bimetallic heating radiator

A very approximate, but often used in practice, calculation is based on the following position: about 0.1 kW is enough to heat one unit of area (sq. M.).The heat transfer of a section of a bimetallic device is assumed to be approximately equal to that provided by a similar part of the heat transfer of cast iron radiators, if an appropriate replacement is performed. If there are two external walls in the room, you need to increase the power by 25-30%. The available volume can be taken into account if the area is multiplied by the height and the nominal standard (41). It corresponds to the minimum power recommended for residential use.

Of course, such a calculation of the heating radiator sections is not accurate. It does not include specific climatic conditions, actual insulation parameters of the building, door and window blocks. To more accurately calculate how many kW in 1 section of cast-iron or bimetallic radiators only specialized specialists can. They apply formulas with correction factors.

What features should be considered when choosing a radiator model

In the passports for specific devices, manufacturers must indicate the power of one section in kW. It is it that should be used in order to find out how many such elements are needed to ensure a sufficient heat flux. Below is a table of heat transfer from heating radiators, which contains some data from radiators of different types. They can only be used for general assessment.

How heat dissipation can be increased without major costs

The most important thing for the rational use of energy resources is the correct calculation. Only he will show how many sections of a certain type are needed to maintain a comfortable temperature in the room using the existing coolant supply system. But the efficiency of a set of equipment can also be increased using the following information:

• The heat flux is reduced if the device is subsequently painted without first removing the old layers.
• Direct and diagonal connections are most effective. In these options, the hot heat carrier is supplied to the upper part, and the outlet is carried out from the bottom. One-pipe communications are less good. In this case (bottom connection), energy consumption will increase by 40% and even more.
• By reflecting the heat flow from the wall using a screen attached to the radiator, you can direct it towards the room. It will heat up faster.
• The following can have a negative effect: contamination of the radiator channels; its too close to the floor, windowsill, walls; inaccurate installation with a violation of the horizontal. By eliminating such disadvantages, it will be easier to use the maximum potential of the heater.

Power calculation

What does it depend on

1. Room area
   - in order for the radiator to effectively heat a given volume, it must have a certain heat transfer, which directly depends on the number of sections included in it. The power is calculated in a standard way: 1 kW - for 10 m² of the room, respectively - 100 watts are required for 1 m².

1. Factors
   - however, not everything is so simple, and the above calculation is approximate, you should take into account various nuances that affect heat loss:

Advice: the heat transfer of the radiator should be calculated taking into account all the negative factors that imply the penetration of cold air into the room.

1. To find out the heat transfer of one heater, you should know the power of the MC 140 cast-iron radiator section and add up their number. This indicator is standard for most manufacturers and is equal to 150 W, but depending on the shape and quality of the device, it may vary slightly.

Heat carrier

Another indicator that needs to be considered is the temperature of the circulating fluid.

Therefore, in the standard capacity of the section, two temperature indicators are taken into account:

• indoor mode;
• temperature inside the heating system, depending on the degree of heating of the heat carrier.

Thermal power is determined by the difference between these indicators. And if at a coolant temperature of 70 ° C, the difference was 50, we can say that the power of 1 section of the MC 140 cast-iron radiator is exactly 150 W.

First of all, this is due to the fact that exactly such a temperature regime is taken into account, at which a constant air temperature in the room will always be maintained at 20 ° C. In addition, heating takes place taking into account the properties of cast iron, which do not differ in high heat transfer rates.

Easy way to calculate

If everything is complicated with the calculations, you can resort to a simpler method and take advantage of many years of experience for those who already use such radiators. A 10-section radiator is required for a 15 m² room.

However, it should be borne in mind that in this case there should be one window in the room. For each subsequent section, it will be necessary to add more sections, the amount depends on the design of the window opening itself, the material from which it is made, the number of chambers in the glass unit and other factors. But, as a rule, 1 or 2 more sections are added, as a result, the price of the equipment increases.

Advice: when the area of ​​the room exceeds 20 m², there should be several radiators. Moreover, they should be installed in different places, since even having increased a certain number of sections, the situation will not improve.

The main qualities of cast iron radiators

Selection is done in two ways:

• convection;
• radiant energy.

They are capable of creating a thermal curtain, therefore it is recommended to install them under the windows, from where the cold comes.

However, the power of one section of the MC 140 cast-iron radiator is not the main indicator of the device's reliability. For example, aluminum and bimetallic radiators are characterized by higher heat dissipation, but their service life is much shorter.

Perhaps this was the reason that cast iron models are still in demand. You must admit that you will not find aluminum batteries in any old building, but there are as many cast-iron ones installed in the past centuries.

The opinion of many people agrees that a large amount of heat carrier required for them is very uneconomical and leads to excessive consumption of energy required to heat it. But this is just a delusion, the more coolant is contained in the device, the more it gives off heat.

In addition, if for some reason the supply of the coolant stops, the cast-iron battery will retain heat transfer for a long time, which is explained both by the properties of the material and the large volume of hot water that it contains.The only drawback of the devices is their high inertness, which contributes to too slow heating, all other problems are quite solvable.

Cast Iron Radiator Specifications

Dimensions and installation rules for the MC-140-500 cast-iron battery.

Now we will talk about the technical characteristics of MC-140-500 cast iron radiators. As follows from the numerical index, the center distance for these devices is 500 mm. The maximum temperature is up to +130 degrees, the pressure test is 15 atmospheres. The capacity of one section is 1.45 liters, height - 580 mm, depth - 140 mm... Radiators are supplied with a primer coating. You can find other technical characteristics from the table.

Output

During its long operation, cast-iron models of radiators have shown themselves only on the good side. Today, not only standard models of such devices are in demand, but also modern ones.

The only drawback is a large mass, so they can be installed with their own hands only on a main wall or on the floor. The video in this article will allow you to find additional information on the above topic.

1. 2. 3. 4. 5. 6. 7.

In the last decade, new models of heating equipment, including radiators, have appeared on the domestic market, but cast iron products are still in demand among consumers. They are produced by both Russian and foreign manufacturers. The cast iron heating radiators shown in the photo are one of the elements of arranging the heat supply of an apartment or your own house.

What is heat dissipation and power of radiators

The power of cast iron heating radiators and their heat transfer are among the main characteristics of any device that provides room heating. Usually, manufacturers of equipment for heating structures indicate this parameter for one section of the battery, and the required number is calculated based on the size of the room and the required one.
In addition, other factors are taken into account, such as, for example, the volume of the room, the presence of windows and doors, the degree of insulation, the peculiarities of climatic conditions, etc. depends on the material of their manufacture. It should be noted that cast iron loses in this matter to aluminum and steel. The thermal conductivity of this material is 2 times lower than that of aluminum. But this disadvantage is compensated for by the low inertness of cast iron, which gains heat and gives it away for a long time.

In closed heating systems with forced circulation, the efficiency of aluminum batteries will be much higher, but subject to the presence of an intense coolant flow. With regard to open structures, cast iron has more advantages with natural circulation.

The approximate power of one section of a cast-iron radiator is 160 watts, while for aluminum and bimetallic devices, the same parameter is within 200 watts. Therefore, under equal operating conditions, a cast iron battery must have a large number of sections.

Advantages and disadvantages of cast iron batteries

Like any heating devices, cast iron radiators have both advantages and disadvantages. Among the advantages are the following:

• Resistance to the effects of chemically active components in the composition of heat transfer fluids. Unlike the materials used in the production of other types of radiators, cast iron practically does not rust.
• Long service life. Some cast iron batteries that have served 50-60 years still function today.
• There is no need to connect a circulation pump, since cast iron radiators create a small hydraulic resistance for the coolant.
• Do not require cleaning for a long time due to the large diameter of the channels;
• Thermal inertia, which acts as an advantage and a disadvantage at the same time.Radiators are able to keep warm for a long time, but temperature control is not possible.

Disadvantages:

• Large dimensions, mass of devices, which significantly complicate their installation;
• Difficulty adjusting temperature conditions;
• Slow warming up when the system is turned on;
• Intercostal joints are quite complex, which interferes with cleaning and painting the product.

The procedure for calculating the number of sections

There are different methods for performing technical calculations for radiators. Precise algorithms allow calculations to be made taking into account many factors, including the size and placement of the room in the building. You can also use a simplified formula that will allow you to find out the desired value with sufficient accuracy. So, you can calculate the number of sections by multiplying the area of ​​the room by 100 and dividing the result by the power of the section of the cast-iron radiator in cotton wool. At the same time, experts recommend:

• in the event that the total is a fractional number, round it up. The heat reserve is better than its lack;
• when the room has not one, but several windows, install two batteries, dividing the required number of sections between them. As a result, not only the service life of the radiators increases, but also their maintainability. Batteries will be a good barrier to cold air coming from windows;
• with a ceiling height in the room of more than 3 meters and the presence of two external walls in order to compensate for heat losses, it is advisable to add a couple of sections and thereby increase the power of the cast-iron heating radiator.

Power section of modern cast iron models

Let's figure out how many kW are in 1 section of a cast-iron radiator of a modern model.

The power of one Viadrus STYL 500 section (produced in the Czech Republic) is 137.5 W.

Russian offers cast iron radiators of original design.

The heat transfer of one section of the cast-iron radiator of the Modern 3-745 / 600 model is 102 W at an average temperature of the coolant of 70 ° C.

The Rokoko 950/790 has 144 watts of power.

The power of the Classic 80 500 cast-iron radiator section (manufactured by Seagull, China) is 150 W.

Having decided to use the ultra-fashionable model Mirabella 770/600 - a modern cast-iron radiator (power of 1 section - 222 W), you can determine the required number of sections, decorated with figured molding and reproducing the atmosphere of luxurious rooms of the middle of the 19th century.

A reliable cast-iron radiator will provide our apartment or industrial premises with heat. The power of 1 section can vary from 100 to 220 W, therefore, before installing the heating system, careful calculations of the required number of sections are carried out to guarantee a comfortable microclimate.

Dimensions and weight of cast iron heating radiators

The parameters of cast-iron radiators using the example of the domestic product MC-140 are as follows:

• height - 59 centimeters;
• section width - 9.3 centimeters;
• section depth - 14 centimeters;
• section capacity - 1.4 liters;
• weight - 7 kilograms;
• section power 160 watts.

From the side of real estate owners, you can hear complaints that it is quite difficult to transfer and install radiators, consisting of 10 sections, the weight of which reaches 70 kilograms, but I am glad that such work in an apartment or house is done once, so it is necessary to calculate correctly.

Since the amount of coolant in such a battery is only 14 liters, then when heat energy comes from the boiler of an autonomous heating system, then you will have to pay for extra kilowatts of electricity or cubic meters of gas.

Service life of cast iron radiators

In terms of such indicators as the duration of operation and sensitivity to temperature and quality of the coolant, cast iron radiators are ahead of other types of batteries. Which is quite understandable: cast iron is characterized by resistance to abrasive wear and by the fact that it does not enter into any chemical reactions with the materials from which pipes and elements of heating boilers are made.

The dimensions of the channels passing through the cast iron batteries are sufficient to ensure that the devices are minimally clogged. As a result, they do not require cleaning work. According to experts, modern cast iron radiators can last from 30 to 40 years.But one cannot fail to say about the big drawback of this product - it is poor tolerance to water shocks.

Which manufacturer to choose?

Cast iron radiators are now made by not so many manufacturers as aluminum and bimetallic models, but we will consider three main brands on the Russian market.

Konner

Cast iron batteries of this company have the following advantages:

• Long service life;
• Low hydraulic resistance;
• Compliance with centralized heating systems;
• The declared high level of heat transfer from the section (up to 150 W);
• Ease of installation;

According to some consumers, these devices actually produce less thermal energy than stated in the passport. Another disadvantage is the rather high cost.

Exemet

Advantages of devices from this manufacturer:

• Environmental friendliness and reliability;
• High heat output produced by one section;
• Able to work in one- and two-pipe heating systems;
• Powder coated;
• Unique design stylized as 19th and early 20th century.

In the production of cast-iron radiators, the method of artistic casting is used, which increases the cost of the devices. Also, their unique design is not suitable for every interior.

GuRaTec

Advantages of radiators of this brand:

• High quality of products, the control of which is carried out in a pressure chamber and hydraulic tests;
• Long service life;
• Environmental Safety;
• Sufficiently high thermal power of the sections (up to 150 W);
• Unique design.

The devices are decorated with various decorative elements that give them an attractive appearance. However, this also affects the cost of products.

4.9 / 5 ( 37 votes)

Working and pressure test

Among the technical characteristics, in addition to the fact that the power of cast-iron heating radiators is important, mention should be made of pressure indicators. Typically, the working pressure of the heat transfer fluid is 6-9 atmospheres. Any types of batteries with such a pressure parameter can cope without problems. The nominal pressure for cast iron products is exactly 9 atmospheres.
In addition to the working pressure, the concept of "pressure" pressure is used, reflecting its maximum allowable value that occurs during the initial start-up of the heating system. For the cast iron model MS-140, it is 15 atmospheres.

According to the regulations, in the process of starting the heating system, it is necessary to check the ability to smoothly start the centrifugal pumps, which should function in automatic mode, but in reality everything is far from being as it should be.

Unfortunately, in most homes, automation is either missing or faulty. But the instruction for carrying out this type of work provides that the initial start-up should be performed with the valve closed. It is allowed to open smoothly only after equalization of the pressure in the heating medium supply line.

But utility workers do not always follow instructions. As a result, in case of violation of the regulations, a water hammer occurs. With it, a significant pressure jump leads to an excess of the permissible pressure value and one of the batteries located along the path of the coolant movement turns out to be unable to withstand such a load. As a result, the service life of the device is significantly reduced.

Operating pressure

This is an important characteristic of the equipment, it shows at what working pressure the radiator is allowed to operate. There are two types of aluminum radiators on sale: withstanding up to 16 atmospheres and classic, designed to withstand up to 6 atmospheres. Depending on these characteristics, radiators are selected for use in private heating systems or for connection to high-pressure heating mains.

In houses with an autonomous heating system, the average pressure value is not more than 10 atmospheres.In systems connected to central heating networks, the operating pressure is higher, it reaches 15 atmospheres. If the heating system is connected to heating mains, then this value can be even higher and reach 30 atmospheres. These data must be taken into account when choosing radiators.

Each type of radiator has its own permitted working pressure. For bimetallic models, it varies from 16 to 49 atmospheres. For the exact technical characteristics, see the technical data sheet of the device or ask the store consultant. The documentation accompanying the product also contains information on testing equipment under pressure. This value is 1.5 times the working pressure.

When choosing equipment, take into account that in a centralized type heating system, the standard pressure does not exceed 15 atmospheres, and in individual autonomous systems it is not more than 10 atmospheres. You also need to know that bimetallic radiators withstand water shocks up to 6 MPa, and aluminum radiators only 4.8 MPa. Based on these characteristics, experts recommend using aluminum devices in autonomous heating systems so that they last longer, and bimetallic ones for connecting to central heating.

Coolant quality for cast iron radiators

As previously noted, for cast iron radiators, the quality of the heat transfer fluid does not matter. These devices do not care about pH or other characteristics. At the same time, foreign impurities, such as stones and other debris, present in municipal heating systems, pass without hindrance through sufficiently wide channels of the batteries and are transported further. Often they end up in narrow holes of steel inserts in bimetallic radiators from neighbors. Naturally, over time, the power of the cast-iron radiator section decreases.

If an autonomous heating system is used in a private house, it does not matter what kind of coolant will be used - water, antifreeze or antifreeze. Before using water as a heat carrier, the property owner needs to prepare it, otherwise the heating boiler, hydraulic group or heat exchanger will quickly fail (read: ""). The output of the heating unit may also drop.