After finishing heating season the issue of changing radiators comes to the fore. If your apartment has leaky cast iron batteries, then it’s time to retire them by installing modern models instead. Private developers, when installing a heating system, often cannot decide which radiators are better - aluminum, bimetallic, cast iron, because each of these models has its own advantages and disadvantages. The consumer may be confused when listening to recommendations from salespeople in stores for relevant products. If you are also deciding this issue, then it is worth comparing aluminum and bimetallic radiators.

Comparison of aluminum and bimetallic batteries

Aluminum radiators look good and look neat; they have several sections that are connected to each other by nipples. Between the sections there are gaskets, they provide the necessary tightness. There are ribs located on the inside, they increase the heat transfer area to 0.5 m2. Such batteries are manufactured using one of the technologies existing today. For example, the extrusion method makes it possible to obtain cheaper and lighter products, but their quality cannot be called high. Today in Europe they have already abandoned this technique.

If you are thinking about the question of how they differ from aluminum ones, then you should pay attention to the fact that the latter can also be made using the casting method. The products are more expensive, but will last longer. are made using two different metals. The body has ribs, which are based on a core of pipes inside the body, through which flows hot water. Such pipes are made of copper or steel, but the first option is becoming increasingly rare today. Many consumers are also thinking about how to find out whether the radiator in front of them is aluminum or bimetallic. The diameter of the latter is smaller compared to aluminum models. Therefore, there is a higher chance of them becoming clogged. When consumers consider the advantages of bimetallic radiators over aluminum ones, they first of all note a more attractive appearance. After all, all the components of such products are hidden inside, so the design can satisfy the most sophisticated needs.

Which batteries are better in terms of heat transfer?

If you are deciding on the difference between aluminum radiators from bimetallic ones, it is also worth comparing them in terms of the intensity of heat transfer. Aluminum radiators take the lead in this regard. One section is capable of delivering approximately 200 watts of thermal energy or more. Half of the heat is given off in the form of radiation. The other half is convection. The battery fins allow for increased heat dissipation. Aluminum has no equal in this matter. Among other things, it has minimal thermal inertia. If you turn on such batteries, then within 10 minutes the rooms of your house or apartment will be warm.

If we're talking about For a private building, you can save a lot of money with the help of aluminum radiators. Today, aluminum ones are becoming popular and are presented in the article. The latter differ in heat transfer, which depends on the manufacturer and model. This parameter will be lower compared to an aluminum radiator. This is due to the fact that the steel core reduces heat transfer, which is 1/5 less compared to an aluminum battery of the same dimensions.

Differences between aluminum and bimetallic batteries in terms of ability to undergo water hammer

In this matter, aluminum comes in second place. His operating pressure not so high, it varies from 6 to 16 atmospheres, and for some models this parameter reaches 20 atmospheres. If you install such radiators as a component central heating, then the products may simply not withstand high pressure. Water hammer can cause the battery to burst, resulting in a hot flood in the apartment. Therefore, you should not take risks by installing an aluminum radiator in an apartment in a multi-storey building.

If you are wondering how bimetallic radiators differ from aluminum ones, then it is worth comparing these products in terms of their ability to withstand high loads. Bimetallic batteries have a durable steel core that is prepared to withstand high pressure. Such products can withstand pressure from 20 to 40 atmospheres. Therefore, it can be argued that bimetallic radiators are more reliable at unstable pressure, when there is a possibility of water hammer occurring.

For reference

The above parameter is important if you choose a battery for an apartment that is heated by a central system. If you are planning to buy a radiator for a private home, then this parameter cannot be called a minus, because local network there is no excess pressure.

Which radiator to choose from a coolant point of view

Quite often, property and apartment owners wonder how aluminum radiators differ from bimetallic ones. This issue is also worth considering from the coolant point of view. Aluminum is capable of entering into chemical reactions, so water is a treasure for it. It contains so many chemical impurities that the walls of the batteries may be subject to corrosion during operation. Therefore, if the pH level of the water flowing in the system exceeds 8 units, then you should expect trouble. However, using central heating, it is simply impossible to monitor these parameters.

Even during a chemical reaction, aluminum can release hydrogen, which creates a fire hazard. Therefore, it is necessary to bleed air from such radiators from time to time. Steel pipes located in the core of a bimetallic product are less demanding on water quality. This is due to the fact that steel is not as chemically active as aluminum alloys. Corrosion will reach such material, but it will not happen so soon. Among other things, manufacturers cover the surface with a protective layer; sometimes stainless steel is used in the manufacturing process, but this makes radiators expensive.

Selection of radiators based on coolant temperature

The installation of aluminum, bimetallic heating radiators is carried out quite often today. However, before purchasing such products, you should ask which of them are capable of working when exposed to water at an impressive temperature. Aluminum can withstand 110 °C, which is average. For bimetallic radiators, this characteristic reaches 130 °C, so these products win.

Reliability and durability

If you are thinking about the difference between aluminum radiators and bimetallic ones, then you should first of all understand that aluminum products will be destroyed by water hammer, corrosion and frequent and significant temperature changes. Therefore, in terms of reliability, the leaders are again products made of two metals; they combine the best qualities of each material. Such products are ready to last for more than 20 years; naturally, in this case we are talking about high-quality products from brands that have proven themselves in the market. Aluminum radiators have half the service life. Once installed, they are ready to serve for 10 years.

Ease of installation comparison

Bimetal and aluminum are quite easy to install, and they weigh less when compared with cast iron. There is no need to use powerful brackets for fastening, even plasterboard wall will be able to withstand light weight. If the supplied pipes are made of plastic, to carry out installation work You only need shaped elements and a set of keys. But as practice shows, bimetallic batteries are still easier to install, since steel cannot be deformed, unlike aluminum, which is a soft metal.

Price comparison

If you are faced with the question of how aluminum radiators differ from bimetallic ones, then it is worth considering these products also in terms of price. The second option is 1/5, and sometimes 1/3 more expensive compared to aluminum products. This difference is quite significant, so bimetal today is not so common among private consumers, because it is not available to everyone. Bimetallic devices have higher hydraulic resistance, so more energy is required to pump water, which increases the cost of operation.

Selecting a radiator for a specific heating system

Having considered the main characteristics of radiators, we can conclude which model is suitable for a certain system. If you use central heating, then the pressure in it can change sharply, sometimes the mark reaches prohibitive values, and water hammer occurs. The temperature will not be stable; it can change during the heating season and even during the day. The composition of the coolant is not clean, it contains chemical impurities, abrasive particles, and there is no need to talk about an acceptable ph level. Based on all this, it can be argued that it is best to abandon aluminum batteries in such systems.

The problems of heating city apartments are often no less significant than in country cottages or private sector houses. If in a private house the homeowner decides on the type of heating system, then in a city apartment with central heating this is irrelevant. More often in such a situation, a problem may arise with choosing a suitable heating radiator, while aluminum batteries or their bimetallic analogues are the most popular. It is these two types of devices that meet all the requirements for heating system products.

Heating batteries made of aluminum

To create a comfortable microclimate, each room in a private house or state apartment is equipped with a heating system, an integral part of which is a radiator. The connection of such a device occurs to the central heating network or an autonomous boiler. In turn, heating of rooms occurs due to convection or thermal radiation due to the circulation of coolant through pipes and radiators, which, when heated, release heat to the environment.

Heating radiators made of aluminum today are the optimal choice of price and quality. Moreover, they can be used both in a centralized heating system multi-storey buildings, and in individual heating private house. But aluminum radiators are very sensitive to the level of acids and alkalis contained in the coolant.

Structurally, an aluminum radiator can be sectional or panel type. Most often on store shelves are products assembled from sections connected by nipples. At the joints of adjacent elements, special gaskets are installed to create a seal.

Another important indicator of an aluminum radiator is the level of its operating pressure. A standard aluminum battery can withstand pressure of no more than 18 atmospheres. However, manufacturers are constantly improving such devices and have reached pressure limits of up to 25 atmospheres. This parameter is especially relevant when choosing radiators in houses with central heating.

Positive aspects of an aluminum battery

An aluminum battery is a product entirely made of aluminum alloy. Due to the fact that such material is very light and durable, finished products can be easy to transport and install. But, besides this, they also have a number of other advantages:

• compact dimensions - in comparison with cast iron analogues, aluminum batteries are much smaller in width;
• maximum level of heat transfer, which is inherent in all aluminum products;
• high operating pressure, which is very important for the quality operation of the heating system;
• the ability to assemble a battery from separate sections - the more such elements in the battery, the more space it can heat;
• high level of efficiency, which is achieved due to effective heat transfer of the material;
• possibility to regulate temperature indicators thanks to the equipment of the device with a thermostat;
• aesthetically attractive appearance of painted aluminum.

If the main criterion for choosing a suitable battery is the cost of the product, then an aluminum radiator much cheaper than its bimetallic counterpart.

Disadvantages of an aluminum radiator

Naturally, nothing is perfect, this also applies to aluminum radiators. If we consider disadvantages of aluminum battery, then I would like to pay attention to the following parameters:

Also very often, due to installation errors, a trivial radiator failure due to fragility of the material. Therefore, it is better to delegate the installation work to professionals in their field.

Bimetal heating radiator

The main feature of a bimetallic battery is the use of a unique technology in its production, which makes it possible to combine materials of different structure and characteristics. These metals mean steel and aluminum. Thanks to this combination, the heating device incorporates positive traits aluminum and steel radiator. Such a battery is considered the most suitable for use in both centralized and autonomous heating systems.

Structurally, such a product consists of steel pipes on which aluminum sections are strung. This technology made it possible to use bimetallic radiator in any room heating system. The internal part of the device, made of steel, can withstand any pressure supplied from the central heating network, and the aluminum sections quickly release heat into the room.

If we consider the cost of such a product, it is slightly more than that of an aluminum analogue, since the manufacturing technology of a bimetallic radiator is quite complex. Well-known manufacturers use technology high pressure casting. Although, to reduce the cost of the finished product, it may be used spot welding, which does not greatly affect the battery life.

What is the advantage of a bimetallic battery?

The first thing I would like to draw your attention to is small internal volume of the product, which allows you to save on heating a small amount of coolant without sacrificing room heating. Plus, bimetallic radiators have the following advantages:

Easy to install thanks to its low weight bimetallic battery, the ability to expand additional sections directly at the installation site, attractive appearance and other characteristics make such radiators popular along with aluminum products.

How to distinguish a bimetallic radiator from an aluminum one?

As it may seem at first glance, an aluminum battery is practically no different from its bimetallic counterpart. But in reality, this statement is incorrect and can lead to the wrong choice of a suitable radiator. And if you plan to save on the cost of the heating device and buy the cheapest model, then it is possible that it will not work for long. Therefore, you need to understand What is the difference bimetallic radiator from an aluminum battery.

Based on the above, we can come to the conclusion that in private housing construction, an aluminum battery is considered the best in terms of price and quality, and for apartment buildings A bimetallic radiator is suitable. Plus modern products are equipped with everything necessary for self-installation from wall brackets to air vent. Therefore, installation of both aluminum and bimetallic radiators is possible with your own hands without turning to specialists for help.

It is not uncommon to see a buyer standing in thought in front of rows of heating radiators, not knowing where to stop. And then there are the annoying salespeople praising the expensive product and spewing technical terms, confusing the puzzled client. In most cases, consumers today choose bimetallic or aluminum radiators - modern, compact, inexpensive.

Aluminum batteries: pros and cons

Radiators are produced in two ways. The first is injection molding of sections. Finished goods successfully resist mechanical loads and water hammer, are distinguished by precise shapes and uniform distribution of internal stresses.

The second method is squeezing blanks through a matrix (extrusion). Several extruded blocks are connected into a battery using pressing. The cost of such products is low, but their performance indicators are much lower than those of cast ones. In Europe, the extrusion method is not used.

Aluminum battery sizes

Important information

Radiators are made from an alloy of aluminum and silicon - silumin. Moreover, Russian manufacturers, taking into account the quality of water in our heating systems, use alloys with reduced reaction characteristics. Such batteries will last much longer than their imported counterparts.

Note! In an effort to reduce heat loss and maintain high temperature coolant in a centralized system, utility workers add special chemical additives to the water. The aggressive liquid actively reacts with aluminum, causing rapid destruction of the batteries.

Second important point– the radiator is connected to the heating system through reinforced polypropylene pipes. Aluminum directly connected to another metal in a pipeline is subject to increased corrosion. Hot water speeds up this process.

Eyeliner metal-plastic pipes

Radiator sections are connected to each other by nipples using rubber seals. If the coolant is water, then the material of the gaskets does not matter. But if antifreeze based on glycerin, ethylene glycol, propylene glycol (“DIXIS”, “Hot Blood”, “HNT”, “AVT-ECO-30”) is pumped into the system, then the rubber will quickly become unusable. In this case, it is better to purchase radiators with a paronite seal.

Advantages of aluminum batteries

• High heat dissipation. The batteries quickly warm up the room.
• Possibility to add or reduce the number of sections (in cast radiators).
• High operating pressure. In standard radiators it is 7-18 atm, in reinforced models - 25 atm. For example, in private homes the pressure in the system usually does not exceed 7 atm.
• The ability to regulate the temperature - today many models are equipped with thermostats.

Thermostat on aluminum radiator

• Compact and light weight. The batteries take up little space and are easy to transport and install. The weight of one section does not exceed 1 kg.
• Low price. Installing new aluminum radiators or replacing old ones will cost a third less than bimetallic ones.
• Modern design. Aluminum batteries will fit into any interior.

An aluminum radiator will be an excellent addition to a high-tech interior

Disadvantages of aluminum

• Dependence on the quality of the coolant. If the pH level of the water is above 7-8, you can expect rapid corrosion of the metal, especially at joints. When deciding to choose bimetallic or aluminum heating radiators, you should consider what kind of liquid will circulate through the system.
• Leaks at the junctions of sections.
• The need to install an air vent. Hydrogen accumulates in batteries and must be released periodically. You cannot check for gas with a lit match. If there is no polymer layer on the inner walls of the aluminum sections, it is strictly forbidden to close the valves on the supply pipes.

• Short service life (maximum 15 years).
• The installation of radiators must be carried out by specialists, since installation errors lead to rapid failure of the devices.

Features of bimetallic radiators

In the production of these products, two types of metal are used - steel and aluminum (“bi” means two). The section is a steel pipe cast under high pressure into an aluminum jacket. Steel elements are connected to the pipeline, withstanding pressure surges and successfully resisting corrosion. Aluminum coating provides high heat transfer. The sections are connected to each other via nipples.

Pros of bimetallic batteries

• Durability and long service life (more than 25 years) due to the internal steel pipe. This is the main difference between bimetallic radiators and aluminum ones.
• High heat dissipation. A small amount of energy is spent on heating the radiator itself. Heat almost immediately begins to be transferred into the room.
• Working pressure up to 40 atmospheres.
• The maximum coolant temperature is 130 degrees (for aluminum batteries - 110).
• Durable coating. Painting is carried out in two stages: first, the product is completely immersed in the dye solution, after which a polymer layer based on epoxy resin. This treatment not only gives the battery aesthetic appearance, but also increases its tightness.
• Easy to transport and install. The number of sections can be increased on site.

Important! Some bimetallic models have a single steel core and are not divided into sections. The advantage of such products is that they can withstand high pressure and are not subject to leaks.

Cons of bimetal

The difference between aluminum and bimetallic radiators is that the heat transfer of bimetal is lower. A steel core significantly reduces this figure.

The cost of bimetallic batteries exceeds the price of aluminum by about 30%. Operating costs are also higher - bimetal has a higher hydraulic resistance, so more energy will be needed to pump water.

Improper use of batteries causes corrosion of steel elements. This happens if water is drained from the system at the end of the heating season. Simultaneous contact with air and water creates conditions for steel to rust.

Narrow bore iron pipe increases the risk of clogging and reduces product life.

Note! Steel and aluminum have different coefficients of thermal expansion, so after some time the radiator begins to make characteristic sounds. This does not pose any danger.

Comparison of aluminum and bimetallic radiators

• Externally, aluminum and bimetallic radiators are similar - they are metal rectangles with flat ribs, painted in neutral tones. The number of sections for both is from 6 to 12. The average heat output of the devices does not vary much - from 180 to 200 W. But the use of devices has its own characteristics.
• Aluminum batteries are installed where maximum heat transfer is required at low pressure and good quality coolant, namely in private homes. Can be put in autonomous system And bimetallic sections, but this will be an unjustified waste of money.
• Bimetal devices were created taking into account the characteristics of domestic centralized heating networks. The steel filling of the battery can withstand frequent pressure drops in pipes, hydrodynamic shocks, and aggressive impurities in the coolant. Therefore in central system For heating, bimetallic radiators should be installed.

Finally. When buying radiators, it is better not to save money and choose devices from well-known brands. If the production technology is not followed, the equipment will not last long. It is extremely important that the installation is carried out experienced specialists, since from correct installation The batteries depend on the operation of the entire heating system and the warmth in the house.

Video: aluminum and bimetallic radiators

A heating radiator is usually called a heating device consisting of cavities various types, inside which the substance circulates in a hot state. This substance is usually water, but other types of liquid can also be used (usually used in individual construction). In the article we will compare bimetallic and aluminum radiators.

Radiators are used everywhere in those rooms in which it is necessary to create comfortable conditions for living or staying of a person during the cold season. Such devices are also commonly called batteries. They are connected to a central heating system or an individual (autonomous) one and heat the room through radiation and convection, that is, hot water enters the radiator, heats it, and it, in turn, radiates heat, warming the space around it.

Based on their appearance, radiators can be divided into several main types:

• sectional - radiators consist of separate sections connected to each other; such sections can be installed in any quantity and thus the size of the device varies, and, therefore, its heating capacity (thermal power). This is achieved due to the fact that the size of the sections is standard and interchangeable, heat transfer occurs due to convection and radiation;

• columnar or tubular - this is an improved type of sectional battery, the radiator also consists of sections, and the main difference is that each section has several pipes, which can be arranged in rows from 2 to 6 in one section, heat transfer occurs only due to convection;
• panel or plate batteries are flat batteries that can be smooth or profiled. They consist of vertical panels (usually at least two) between which a convection plate is located, in order to increase the thermal power, it is recommended to mount more than two plates in one structure, this type of radiator belongs to modern models, manufacturers offer products with installed thermostatic valves, large Some of the heat is transferred into the room due to radiation.

All modern devices heating systems are different appearance, the amount of heat transfer, in size, as well as in the material from which they are made. If previously only cast iron or steel was used, today such batteries are replacing aluminum or bimetallic radiators. What is the main difference between these two modern types batteries? In order to understand this, you should understand in more detail the operating principle and manufacturing technology of each type.

Aluminum radiators

• Radiators made of aluminum are optimal choice for heating rooms with both a central heating system and an autonomous one. One of the features of aluminum radiators is that during their operation it is important what acidity the water circulates in them.
• For the first time, an aluminum heating system was put into operation in Italy in the mid-20th century. Gaetano Gruppioni was the first to develop the technology for the production of radiators from this metal; production was carried out using high-pressure casting methods. And already in 1965, such batteries entered mass production.
• By design, aluminum radiators can be sectional or panel. Most often on the Russian market you can find devices consisting of heating sections connected by nipples. Special seals are installed between such elements. Majority modern models equipped with rubber seals. If the battery is installed in a house heated with a water filler, then the material from which the gasket is made does not matter, but if the coolant is some kind of antifreeze (low-freezing liquid based on ethylene glycol, propylene glycol or glycerin, for example, “Hot Blood”, “AVT- ECO-30", "ХНТ", "DIXIS" and a number of others), then the rubber seals will very soon fail. In this case, it is recommended to purchase devices with paronite gaskets or produce them self-installation(i.e. purchased separately).

• Also one of the important indicators is the operating pressure of the purchased device. In standard radiators, this indicator corresponds to a value of 7-18 atmospheres. The operating pressure of reinforced aluminum heating devices is up to 25 atmospheres. This parameter should definitely be taken into account when purchasing new equipment. As a rule, in multi-story buildings, the pressure in the pipes is 7-10 atmospheres, but it is always better to have a small reserve. For country house, often, this indicator does not exceed 6 atmospheres and it is quite enough to install a battery with a standard value.

Advantages of aluminum radiators

• Lightness - due to the fact that aluminum has a low specific gravity and products made from this metal are quite light (the weight of one section is in the range of 1-1.5 kg), this indicator affects the transportation and installation of the product, which goes through the maximum Just;
• compactness - unlike cast iron batteries, aluminum radiators take up much less space, its width usually does not exceed 10 cm;
• high heat transfer is also one of the main indicators of aluminum; thanks to this quality, the heating device is able to warm up the air in the room as quickly as possible;
• high working pressure - this indicator is very important for uninterrupted operation heating device, since if the operating pressure of the radiator is less than the pressure of the heating system, the material may rupture, which will lead to an emergency;
• the ability to install any number of sections - the more sections in the device, the more power it has, and, therefore, the larger room it can heat;
• high efficiency - due to efficient heat transfer of aluminum;
• the ability to adjust the temperature - some models are equipped with a special thermostat;

• visual appeal - usually the manufacturer tries to give its products maximum aesthetics so that the battery can be harmoniously installed in any interior;
• if the main criterion for choosing an aluminum or bimetallic radiator is price, then the choice will be in favor of the first option.

Of course, aluminum radiators also have disadvantages, which you should also be aware of before purchasing this equipment.

Disadvantages of aluminum radiators

• Dependence on the pH level of the water - this indicator should be within 7-8 percent, since at a different level this metal often fails, corrosive formations begin to appear, which over time will lead to failure of the radiator;
• the need for an air vent - such a system must be installed on absolutely any aluminum heating devices, since otherwise sections of the device may rupture due to the likelihood of gas formation;

• A product made of aluminum should be connected to pipes made of the same metal - if you do not comply this item, then the rusting process will be as intense as possible and the battery will soon have to be replaced;
• the possibility of leaks at the junctions of sections with each other;
• the main part of the heat is concentrated on the fins of the battery, that is, its unevenness is observed;
• short service life within 5-15 years, depending on the manufacturer, but it is worth noting that some manufacturers of these products were able to achieve a longer service life, which is 20-25 years;
• low convection;
• in the absence of an internal polymer layer, it is prohibited to turn off the taps on the supply pipes;
• Installation errors also lead to damage to the radiator, which means this work should be trusted to professionals.

Specifications

Batteries are made from pure aluminum or from an alloy of aluminum and silicon (silumin). This composition has a high level of wear resistance and strength, it is resistant to corrosion in alkaline and slightly acidic environments. There are three main versions of radiators:

• cast sections, each made separately, and easily connected to each other into a single structure;
• extruded sections, when in one section there are several elements connected to each other (usually up to three);
• combined radiators, in this version the first and second types are combined.

The sections are cast at high pressure; the elements are connected to each other by threaded parts. The connections are sealed with special linings, which can be made of rubber or paronite. The peculiarity of aluminum heating devices is that their design has thin ribs that are located inside each section. Thanks to this device, the maximum heat transfer rate is achieved.

• The standard size of an aluminum radiator is thickness (depth) 10 cm, height from 35 to 100 cm, and the width of one section is 8 cm. Aluminum batteries release heat into space in two ways - radiation and convection (that is, warm air, according to the laws of physics, rises from bottom to top, and so the whole room gradually heats up).
• Anodized products are considered one of the types of aluminum appliances. Such radiators are made of aluminum (highly purified) with anad oxidation. This effect changes the structure of the metal and increases its characteristics, especially resistance to rust. An additional advantage of this device is also that heat transfer increases significantly. The elements are connected to each other by special couplings, not nipples. The working pressure is within 50-70 atmospheres.
• The modern market for heating radiators offers a fairly wide the lineup aluminum devices. They can be both domestic and foreign production. The main difference is that foreign manufacturers think very carefully about the design of their products, but also some characteristics can be an order of magnitude higher. True, there is one serious drawback, which is that such batteries can only be installed under ideal heating system conditions, otherwise the product will quickly fail.

Main manufacturers of aluminum radiators:

• "Apriori";

• "Elsotherm";
• "Fondital";
• "Global"
• "Konner"
• "Mectherm";
• "Oktober"
• "Sira".

Bimetallic radiators

• The main feature of these products is that they are produced using a unique technology. In the manufacture of such radiators, a combination of two metals is used (the prefix “bi” means two). These metals include aluminum and steel. Due to this combination, the heating device simultaneously displays the properties of aluminum (sectional) and steel (tubular) radiators. This type products are considered the most optimal choice for heating systems in Russia with both an autonomous (private housing construction) and a centralized (apartment residential buildings) principle of operation.

• The design of the radiators is a steel pipe that runs inside aluminum sections. This is precisely the technology that is ideal solution For Russian realities where steel is practiced heating pipes(risers). The internal iron part is connected to the heating pipe and perfectly withstands any applied pressure, and the aluminum sections provide high thermal conductivity.
• Bimetallic radiators are slightly more expensive than aluminum radiators, since more complex technology is used for their manufacture. Reliable manufacturers use the injection molding method. Today there is a cheaper technology that uses spot welding. But even despite the fact that the sections are not solid, but connected, the batteries have excellent strength characteristics. Elements made of different metals fit very tightly to each other so that there is not even a gap for air between them.

Why bimetallic radiators are better than aluminum ones

The coolant volume is small in size and at the same time ensures sufficient quantity heat;

• does not matter chemical composition heating fluid;
• maintain high pressure - the operating pressure can reach 35 atmospheres, and sometimes higher;
• the sections have a reliable seal - a material such as paronite is used for laying the sections, which is more practical than rubber and can withstand the effects of most coolants, even aggressive ones;

• high margin of safety - due to the presence of a steel pipe in the structure, which shows excellent resistance to corrosion processes and mechanical stress;
• permanent coloring - occurs in two stages, in the first - the radiator is completely immersed in a bath with a coloring composition (anaphoresis technology), and in the second stage, a polyester-based epoxy coloring solution is sprayed, in addition, today you can find products not only in white variant, but also in different colors;
• long service life - from 25 years or more, thanks to the use of steel pipes in the structure, as well as through the use of a two-stage painting technique, which maintains a stable color throughout the entire period of operation;
• good heat transfer - due to effective heat exchange between the aluminum body and the coolant;
• ease of assembly and installation - thanks to the small specific gravity and technologies for expanding sections directly at the installation site;

• ergonomics and design at a high level - this indicator is in no way inferior to aluminum products.

Disadvantages of bimetallic radiators

• The main disadvantages of these products include their high price, but if we take into account their great strength and reliability, then we can say that such a cost is completely justified. As a rule, it is recommended to install bimetallic batteries in apartments of multi-storey buildings, since there is a higher operating pressure of the heating system here.
• The second drawback occurs when improper use batteries The steel core, when exposed to water and air at the same time, can be subject to rusting. This happens when water is drained from radiators at the end of the heating season. This is also possible if antifreeze is used as a coolant.

Specifications

• Bimetallic radiators are made of aluminum (outer casing) and steel (internal structure), sometimes steel is replaced with copper. The thickness of the internal steel coating is 2.5 mm, which is enough to withstand high operating pressure (up to 40 atmospheres) and also reliably resist corrosion for many years.
• One more important characteristic steel, it is also believed that it is not destroyed by alkali and acid, and, therefore, can function with almost any coolant. Aluminum housing secures batteries additional heat transfer(the amount of heat that the radiator is capable of giving off at a coolant temperature of 70 degrees). This indicator is in the range of 170-190 W (in cases where the distance between the axes is no more than 50 cm - the standard indicator).

• Heat transfer occurs in the same way as in aluminum models, by convection and radiation. Steel pipes are able to withstand water temperatures of 110, and some models even 130 degrees. But batteries are designed in such a way that Maximum temperature water should be no more than 90 degrees (as a rule, in a conventional heating system this figure is not exceeded). The most current characteristics of specific models can be found in technical passport products.

Today bimetallic units are sold in two varieties:

• A bimetallic radiator made of a steel core and surrounded by aluminum, while the aluminum parts are completely separated from the coolant, that is, contact with water is excluded. Such models are produced mainly by Italian manufacturers, the most famous brands“Global Style” and “Royal Thermo BiLiner”, but you can also find such models from the Russian company Santekhprom BM.

• The second type of radiators is conventionally called “semi-bimetallic”. In such models, only the pipes that reinforce the vertical channels are made of steel, and aluminum may partially come into contact with water. The advantage of such units is that they cost about 20% less than 100% bimetallic products and release heat 10% more. The most famous manufacturers are the Chinese company “Gordi”, Russian company"Rifar" and the Italian concern "Sira".

Products based on two types of metal, as well as aluminum batteries, can consist of separate sections, in which case each element is manufactured at the factory, and then the master can independently assemble the required size by connecting the parts together with nipples. There is also a variety in which the radiators have a single steel core, onto which it is installed at the factory. required quantity sections. The advantage of this type is that it can withstand high pressure and is not at risk of ruptures at the joints.

Manufacturers of bimetallic heating devices are practically the same companies as aluminum units. Most of the popular and most reliable models are of Italian origin.

Main manufacturers:

• "Global"

• "Gordi"
• "REGULUS";
• "Rifar";
• "Royal Thermo";
• Sira group;
• "MAPC";
• "Santekhprom BM"

Difference between aluminum and bimetallic radiators

At first glance, it seems that both types of radiators are very similar, and there are practically no differences between them. This is a slightly incorrect opinion, as a result of which the heating device may be selected incorrectly. And if you would like to save money and choose a unit at the lowest cost, then there is a high probability that soon you will simply have to replace it. And as a result of such ignorance, you will have to overpay by purchasing the product again, and sometimes even spend money on expensive repairs.

• So, what is the difference between bimetallic radiators and aluminum ones? First of all, it is worth noting that in appearance they are very similar - these are flat rectangular batteries, usually painted in White color. The number of sections for both species can vary from 6 to 12 (in standard variations). Therefore, the criterion of aesthetics and the size of the radiator in this case do not affect the choice. Also, in the presented options, the heat transfer element is made of aluminum, that is, their heating capacity is approximately the same level.

• The main differences are in the internal design. Aluminum, as you know, is a type of light and soft metal, so products made from it are not always able to withstand high stress. That is, the coolant flow passing through them (most often water) must have a working pressure in the range of 6-12 atmospheres for standard models and no more than 25 atmospheres for reinforced radiators. While bimetallic units have a steel (or copper) core through which water can circulate with a pressure of up to 35 atmospheres, this indicator is not limit value. That is, if there is a high probability that there may be high pressure in the heating system or sharp jumps(water hammer), then it is better to acquire a device with a large reserve of this characteristic.

• Considering the cost of externally similar models from the same manufacturer, but from different materials, it is worth noting that aluminum devices cost an order of magnitude less than bimetallic ones. For example, we can consider Global brand radiators with similar characteristics. So, the bimetallic device “Global Style Plus 500” - dimensions 57x80x95 cm and heat output 185 W, has a price for 1 section of 750 rubles. The aluminum radiator “Global Klass 500” - with similar dimensions - 58x80x80 cm and almost the same heat output - 187 W, has a cost of 500 rubles for 1 section. That is, if the operating pressure in the heating system is stable and does not exceed 6 atmospheres (usually in private homes), then you can safely buy aluminum products.
• The next point is the weight of the products. Steel has a slightly larger mass than pure aluminum, so 1 section of a bimetallic battery weighs 1.3-1.8 kg, and a section of an aluminum device weighs 0.7-1 kg. That is, in principle, this difference is not significant if a small radiator is required, but the more sections, the greater the difference in the weight of the product. This is worth considering, since it will be a little more difficult to install a heavy unit alone.
• And the last significant point is the service life of the devices. Aluminum radiators are inferior in this regard to bimetallic ones. Since they have a short operational period, usually not exceeding 15 years. While products based on two metals have a service life of 25 years and above. Therefore, if you are planning on long-term use of the device, then you need to opt for a bimetallic radiator.

It all depends on where the battery will be used. If this reliable system autonomous heating, then an aluminum radiator will become the most the best option. In this case, you can significantly save your budget and purchase a high-quality product that will last a long time (the service period most often depends on the aggressiveness of the coolant and, if treated with care, can be much longer than stated by the manufacturer). If the battery is used in conditions centralized system heating, then it is best to opt for a bimetallic product. And be absolutely sure that nothing will happen to the device; it will withstand any negative impacts non-ideal coolant, and will be a reliable source of heat.

How to calculate the required number of radiator sections

Before you buy new battery, you should calculate exactly what size is needed for each specific room. The number of sections will depend on the following factors:

• the volume of the heated room is the first and most important point in the calculations;
• how many doors and windows are there in the room - as a rule, a heating device is installed under each window, this is done so that the warm air emitted by the radiator rises upward and, as it were, blocks the flow of cold air from the window;
• The amount of heat transfer from the radiator depends on what kind of material is used in the design of the heating device.

As a rule, it is recommended to make calculations based on the fact that for every 10 square meters each room should have 1 kW of battery power (provided that the room has only one window and one external wall, and the ceiling height is no higher than 2.7 m). That is, when any parameters change, the required battery power also changes. So, a room with two external walls requires 200 W more power, and a room with two windows and two walls requires 300 W more. Taking into account these requirements, you can easily calculate the required number of sections.

• The next step is to multiply the square footage of the room by the thermal power. And then the resulting value is simply divided by the power of one section (this parameter is indicated in the passport for a specific product).
• Also, when choosing a battery for your home, you should take into account such a parameter as “heat loss of the building”. This process occurs inevitably, since any material transmits a certain amount of heat. It is also important to know the initial parameters of the heating network. In panel and block high-rise buildings, heat loss does not exceed 100 W/m2, in private houses this characteristic slightly lower and is about 75 W/m2.

When purchasing a heating device for a city apartment, you need to make sure that the radiator fully meets the operating conditions of the system central heating. Since problems such as unstable pressure in pipes, low quality coolant (increased content of alkali and various salts), high water supply speed may arise. The combination of these factors leads to rapid failure of heating units, which is why you should choose the most reliable products.

On the Russian market, the batteries produced under the brands “Style Extra” and “Style Plus” have proven themselves best - these are bimetallic devices from the company from Italy “Global”. main feature bimetallic products “Style Plus” is that a section 9.5 cm deep can show a heat transfer value of 185 W, which is a very good characteristic.

Based on the foregoing, it can be noted that for private housing construction, aluminum radiators are the best option, and bimetallic ones are more suitable for apartments in multi-storey buildings. The following are supplied with modern batteries: mounting elements, like: wall brackets (from two pieces), plugs, air vent and gaskets. Therefore, installing aluminum or bimetallic heating radiators yourself is practically not difficult, but if you still have doubts about your own qualifications, then the best solution would be to invite an experienced specialist.