Some consider the centralized heat supply in apartment buildings to be a relic of the Soviet era, while others consider it to be an undoubted benefit of civilization. But we all continue to use this heating method.
The main element of such a system is the heating batteries for the apartment, which stand under the window in the living rooms of high-rise buildings. Their types and features will be discussed in our article. We will also briefly consider the main advantages and disadvantages of cast iron, aluminum, steel and bimetal radiators.
The principles of classification of radiators for apartments
As a heat carrier in centralized heating systems, water heated to 95 ° C is usually used. Moreover, it is used not purified distilled, but technical with dissolved salts and additives.
As a result, the material from which the battery is made in the apartment must for a long time calmly tolerate the effects of temperature extremes, moisture, and impurities contained in the coolant.
To last for many years, the battery for heating the apartment must:
- withstand working pressure up to 9 atm (ideally up to 12-15 atm);
- made of metals resistant to chemical and electrochemical corrosion;
- have high heat dissipation.
Pressure in apartment radiators fluctuates around 4–7 atm. Much here depends on the number of storeys of the apartment building, the temperature outside the window and the operating conditions of the heating system. But during pressure testing and water hammer, the pressure can briefly rise to 15 atm and above.
All heating radiators are made of metals (aluminum or iron) - only they are able to withstand the workloads generated in heating systems
Also, the heating device in question should be easy to install, have a presentable appearance and low cost. But, most importantly, it must have excellent heat transfer characteristics.
The main task of the radiator - give the room the heat that came through the pipes with water. The more efficiently he does it, the better the landlord.
There are two main criteria for classifying heating batteries:
- The material of manufacture.
- Constructive execution.
All other parameters are already technical characteristics of a specific radiator model.
Features of different designs
The functionality of heating radiators is influenced not only by the material from which they are made, but also by their design.
So, constructively, batteries are:
- sectional (block);
- columnar (tubular);
- panel.
The first two options are a set of several elements assembled into a single heater, and the third is a monolithic block.
Sectional devices for water heating include widespread aluminum radiators. A classic example of a columnar analog is an old cast-iron battery.
Column-shaped radiators assume exclusively lateral connection, while sectional and panel options can be connected at the side and bottom, you just need to choose the appropriate model
Sectional radiator consists of two collectors interconnected by plate blocks of metal. Water in it does not move through these jumpers. The heat transfer medium first gives off a pair of pipes, and they already heat sections with ribs.
In a column heating device, jumper blocks, on the contrary, have internal cavities for water circulation. A panel is generally a completely hollow single unit.
Separation by material
In terms of battery design, there are vertical and horizontal. For apartments, they usually choose the second option - they are easier to install under the window and connect to the pipes of the existing heating system.
But if there is an acute desire, then it is quite possible to install a vertical type. Only such an installation is more complicated and more expensive.
However, all this is more a question of aesthetics and personal preferences of the landlord in the issue of interior design. The main point of choosing a domestic heating radiator is the metal of its manufacture. It can be cast iron, steel, aluminum or bimetal (aluminum + steel).
Each metal has its own merits. To determine exactly which radiator is best for a particular apartment, you need to carefully study all the features of the available options.
In some cases, the best choice would be a cast-iron battery, while in others, only a steel analog will be suitable for installation.
Option # 1 - Corrosion Resistant Cast Iron
The cast-iron batteries remaining in some apartments from Soviet times now look ugly, and sometimes openly ugly. This is especially true for devices with a large number of layers of partially peeling paint.
Initially, cast iron, as a material for the production of radiators, was chosen due to the cheapness of the metal and the simplicity of mass production of heating devices.
A modern cast-iron battery, a beautiful and efficient device that retains all the advantages of an old solid "cast iron" in the form of high resistance to corrosion and undemanding for clean coolant
Such batteries continue to heat many apartments today, even half a century after installation. This is the best choice among all analogues in terms of corrosion resistance.
Plus, blockages and air blockages in such heaters are formed only in extremely rare cases. The gaps in their internal cavities are initially too large for suspensions and air bubbles in the coolant.
Among the main advantages of cast iron it is worth highlighting:
- long service life;
- resistance to corrosion processes;
- low price;
- high thermal inertness;
- unpretentiousness in terms of purity of water.
Their main advantage and at the same time a disadvantage is the inertness of heating and cooling. On the one hand, a cast iron radiator slowly heats up, but on the other hand it does not cool down as fast as aluminum or steel.
Moreover, a sufficiently large volume of water is contained inside it. In a situation of temporary shutdown of central heating and termination of the coolant circulation, the cast-iron battery will still gradually give off heat for some time. Whereas other options, on the contrary, instantly cool.
In addition to steel, aluminum and cast-iron, heating equipment stores also have copper batteries, however, due to the high cost and problems with electrochemical corrosion, it is not recommended to choose “copper” for urban apartments with central heating
Among the shortcomings of cast-iron appliances are:
- heavy weight - one section weighs 5-6 kg;
- low protection against water hammer;
- brittleness of cast iron - such a battery, split from frozen inside water, is far from rare;
- point strike - predisposition to damage during point mechanical shocks.
Another significant drawback of cast iron is the relatively low working pressure of 6–8 atm. For apartments in old panel five-story buildings or stalinkas, this option is quite suitable. But for a dwelling in a modern apartment building in 12-16 floors, it is better to prefer something else.
At a minimum, before buying a cast-iron battery for installation in a high-rise building, it is necessary to clarify the coolant pressure existing in its heating system, usually there it is above 10 atm.
More about the pros and cons of cast iron batteries we wrote in the next article.
Option # 2 - Practical Steel
Steel batteries are practical and come in two types - tubular or panel. The first are a direct analogue of the cast iron appliances described above. They have similar characteristics in terms of heat transfer and weight, but a more presentable look.
The second are made of two steel sheets welded together and form inside a thin layer-cavity for water circulation.
This option has higher heat transfer rates, so they are often combined together in several pieces. As a result, the total heat transfer area increases dramatically.
To increase corrosion protection in these batteries, all steel surfaces are coated with special paint. As a result, their service life reaches 15–20 years, however, with the slightest damage to the protective coating, the steel begins to rust quickly.
Steel batteries survive better water shocks than cast iron counterparts. But they have one very weak spot - welds. Here, rusting most often begins, and here, mainly, breaks occur during jumps in the pressure of water in the system.
The advantages of steel radiators are as follows:
- Low inertness - heats up quickly and quickly transfers heat to the room.
- Light weight - with the same heat dissipation, a steel device weighs obviously less than a cast-iron one.
- Low cost.
- The ability to install a thermostat.
- Attractive and often original design.
As for the negative points, they are also available. So, these radiators should definitely not be installed in bathrooms. There is high humidity at which steel will quickly rust. In such conditions, the steel battery will not last long.
For apartments in high-rise buildings, it is not recommended to take steel radiators. They are more suitable for installation in private homes with a lower working pressure of the coolant than in a central heating system. More information about pressure standards and how to increase it is given here.
Option # 3 - Durable Aluminum
Aluminum radiators are today the most common in the market of household heating equipment. This is due to their low cost, durability and light weight, as well as the extreme ease of installation.
Aluminum batteries are produced by casting and extrusion technology. The first option is more durable and belongs to the sectional variety, and the second is cheaper and is a single monoblock
When casting, separate sections are created, which are then connected to a common radiator by a set of several of these blocks. If necessary, such a battery can be increased by adding new elements even after installation is complete.
The extrusion analogue is immediately made at the factory. Add to it the details to increase the area of heat transfer then impossible. But it is cheaper than the injection option.
We reviewed the performance and installation features of aluminum radiators in detail in our other article.
Among the advantages of aluminum radiators, it is worth highlighting:
- high heat transfer rates;
- low weight of the heater;
- modern design;
- affordable cost;
- the ability to complete thermostat;
- service life of 30 years;
- lack of predisposition to peeling paint.
The main disadvantage of an aluminum heater is the demanding characteristics of the coolant. The smallest solid suspensions during the circulation of water begin to scratch the protective coating inside. As a result, aluminum remains unprotected and gradually begins to corrode.
Aluminum surfaces actively react with acids and alkalis, plus the presence of copper elements and stray currents in the heating system is contraindicated
Another rather unpleasant moment is the formation and accumulation of hydrogen in aluminum radiators. If these batteries are not equipped with air vents, they can be slightly inflated from the inside.
Breaking the heater will not break, but small leaks may well form at the junction of the sections. Plus, the chance of formation of air jams in the system increases, which is also difficult to call a plus or advantage.
The maximum working pressure for different models of aluminum radiators ranges from 10–20 atm.
In this indicator, they are superior to cast iron and steel counterparts, but inferior to bimetallic competitors. It is this option that is recommended in most cases to be installed in city apartments.
Option # 4 - practical bimetal
The most durable and durable among all household heating radiators are bimetallic. They have a steel core through which water circulates, and an aluminum outer layer. As a result, they combine the reliability of steel and the heat transfer of aluminum.
We recommend reading about the existing varieties of bimetallic batteries, their characteristics and selection rules here.
In terms of the heat transfer parameter, the bimetallic battery is slightly inferior only to a purely aluminum competitor, but it greatly exceeds its strength
These batteries were originally created to replace old cast iron. They were immediately designed taking into account the specifics of the existing district heating in Russia.
No wonder they are called universal radiators, which can be installed without problems in almost any apartment.
The advantages of a bimetal radiator are as follows:
- Reliability - working pressure in the region of 35 atm.
- Undemanding to the chemical composition of the coolant.
- High corrosion resistance.
- Compactness and modern appearance of the device.
- Light weight.
The main and only significant disadvantage of this device is the high price. They are the most expensive among all analogues. However, these costs will necessarily overlap with a long service life and the absence of leaks with floods.
Especially bimetallic radiators are relevant in homes where frequent pressure drops in the heating system occur.
To make it easier for you to figure out which radiator is better, we made a selection of video materials with an analysis of the different nuances of these devices.
The following video will help you understand the types of radiators and determine which are best suited for specific operating conditions:
10 mistakes when replacing old heating batteries in an apartment:
When choosing which battery to put in your apartment, you must first focus on the parameters of the central heating system.
In an old house, it is often possible to install only cast-iron radiators. Aluminum options are ideal for new buildings and panel five-story buildings. And reliable bimetallic analogues are universal devices suitable in almost any situation, but worth a lot.
And which batteries do you personally consider the best and which ones are installed in the heating circuit of your house / apartment? Share your impressions of their use, add unique photos of your radiators and useful recommendations to beginners.