Bimetal or aluminum in a private house

Selecting the ideal heating system for your house is essential for both efficiency and comfort. The argument between aluminum and bimetal radiators is one that frequently comes up among the many options available. For homeowners, this is an important choice because each has pros and cons of their own to weigh.

Usually made of steel and aluminum, bimetal radiators combine two distinct metals in their construction. A combination of heat conduction and durability is provided by this combination. While aluminum promotes effective heat transfer and ensures rapid and even distribution of warmth throughout the space, steel offers durability and strength. For this reason, bimetal radiators are a common option for many homes looking for dependable and efficient heating solutions.

Conversely, aluminum radiators are renowned for their quick heat distribution and lightweight design. Aluminum heats up quickly and dissipates heat effectively because of its high thermal conductivity. This causes the room to warm up more quickly, which is why people who value energy efficiency and quick response times find aluminum radiators especially appealing.

A private home’s budget, heating needs, and long-term upkeep should all be taken into account when selecting between bimetal and aluminum radiators. Because of their sturdy design, bimetal radiators may initially cost more, but over time they frequently prove to be a wise investment because they require little maintenance and provide dependable performance for many years to come.

On the other hand, aluminum radiators have superior heat transfer capabilities and are usually more reasonably priced up front. To avoid corrosion, they might need more regular maintenance, though, particularly in places with hard water. Making an informed decision based on personal preferences and needs can be facilitated by homeowners having a clear understanding of these trade-offs.

Which heating radiators are better aluminum or bimetallic

The topic of changing the batteries has become increasingly important as the heating season approaches. Modern radiators should take the place of the outdated cast iron ones, which are worn out and old. When installing heating, private builders frequently struggle to choose the right kind of radiators. The unsophisticated consumer is at a loss for what to buy after hearing salespeople in stores rave about the newest models. He never imagines whether bimetallic or aluminum radiators are superior. Let’s examine this query with objectivity.

In the debate between bimetal and aluminum for heating systems in private houses, the choice boils down to durability, efficiency, and cost-effectiveness. Bimetal radiators are robust and can withstand high pressure, making them ideal for long-term use. They distribute heat evenly and retain warmth even after the system is turned off, ensuring consistent comfort. On the other hand, aluminum radiators heat up quickly and are lightweight, making installation easier and more flexible. However, they may not be as durable as bimetal options and can be prone to damage from high pressure or corrosion over time. While aluminum radiators may initially seem cheaper, the long-term cost of maintenance and replacement should also be considered. Ultimately, the decision depends on individual needs, budget, and preferences, with bimetal offering reliability and longevity, while aluminum provides efficiency and ease of installation.

Let"s start comparing bimetallic and aluminum radiators

What is each type of radiators

1. Neat and fashionable, aluminum radiators are made up of multiple sections joined by nipples. The required tightness is provided by the gaskets that separate the sections. The interior ribs have the ability to greatly expand the heat output area by up to 0.5 square meters. There are two ways to make radiators. The extrusion method, which is not used in Europe, yields inexpensive, lightweight products that are not of the highest quality. Radiators manufactured using the casting process will be more costly but more robust.

A kind of radiator made of aluminum.

2. Two distinct metals are used to make bimetallic radiators. The fin-equipped casing is composed of an aluminum alloy. This body contains a core of pipes that allow the coolant—hot water from the heating system—to pass through. Either steel or copper are used to make these pipes (the latter is almost nonexistent in our nation). Because of their smaller diameter compared to aluminum models, clogging is more likely to occur.

The bimetal radiator has an extremely elegant appearance, and its design meets even the most discerning needs. Its interior conceals every steel component.

What will give more heat – bimetal or aluminum?

Aluminum batteries clearly outperform other materials in terms of heat output. They have a section that has a heat energy output of more than 200 watts. Radiation and convection combine to release half of the heat. The heat output is further enhanced by the fins that extend from the inside of the sections. Thus, aluminum has no equal in this regard. Observe that its thermal inertia is likewise negligible. After turning on the radiators, the room becomes warm within ten minutes. In a private home, this allows for significant cost savings.

Let’s now discuss bimetallic devices. The manufacturer and model determine how much heat is produced in each section. Compared to an all-aluminum radiator, it is marginally lower. Ultimately, compared to an aluminum radiator of the same dimensions, the overall heat transfer can be reduced by one-fifth thanks to the steel core.

The process of heat transfer also involves thermal radiation and convection. Furthermore, they have little thermal inertia.

About the ability to withstand high pressure (especially water hammer)

Aluminum performs poorly in this situation due to its low working pressure values. Just six to sixteen atmospheres (some models may reach up to twenty) may not be sufficient to withstand spikes in pressure within the central heating system. Additionally, there won’t be any hope left at all due to hydrostroke; instead, the apartment will flood violently and the batteries will explode like empty nutshells. Because high-rise buildings do not use aluminum radiators, you should not take any chances.

Bimetallic models are well-prepared for high pressure since they contain a robust steel core. 20 to 40 atmospheres is a good range. They won’t be harmed even if the pumping station’s valve is opened or closed in the event of an accident on the route. Bimetallic radiators function best in systems with unstable pressure because that is when hydrostroke is most likely to happen.

When selecting radiators for apartments with centralized heating, this parameter is crucial. This parameter—that is, the absence of overpressure in the local heating system—does not work against aluminum radiators if you choose them for a private residence.

What is better bimetallic radiators or aluminum radiators in relation to the coolant

Since aluminum enjoys engaging in different chemical reactions, the water in the central heating system is just a "treasure" to him. There are so many chemical impurities in it that corrosion will eat away at the battery walls until there is almost nothing left. Expect problems as soon as the system’s hot water pH rises above 8 units. After all, it is impossible to monitor this indicator when there is central heating. Additionally, aluminum releases hydrogen during chemical reactions, which can start a fire. This is the reason these radiators should always have their air bled out.

The steel pipes situated between bimetallic radiators pose less of an impact on the water quality that passes through them. Steel isn’t as chemically active as aluminum alloys, after all. Naturally, corrosion occurs and eventually reaches it, albeit slowly. Additionally, a unique protective layer is applied by the manufacturers. Stainless steel is also occasionally utilized, although it is highly costly. In any event, the bimetallic radiator is better shielded from coolant that is overly chemically active. The introduction of oxygen into this water is the only threat. At that point, the steel begins to rust extremely fast.

The maximum temperature of the heat carrier – which radiators have a higher temperature?

The query is valid since our radiators frequently "burn with fire," making them impossible to touch. Aluminum can therefore, on average, tolerate boiling water temperatures up to 110 degrees. This indication is marginally higher for bimetallic products—130 degrees. Thus, they prevail in this instance.

What is more reliable, durable and long-lasting??

Again, radiators made of two metals are found in the leaders because they best utilize the attributes of both. These gadgets have a lifespan of at least 15 to 20 years (of course, we are talking about high-quality products from reputable brands). Generally speaking, aluminum is half as long as its siblings, lasting up to 10 years.

What is easier to install?

Installing aluminum or bimetal is relatively comfortable due to their relatively light weight (in comparison to the same cast iron). Even plasterboard can support their little weight, so mounting them doesn’t require very strong brackets. All you need for installation, if the pipes are plastic, is a set of wrenches and fittings. Nevertheless, bimetallic radiators are still simpler to install since, in contrast to aluminum, which is a soft metal, steel pipes are unbreakable.

Which is cheaper, which is more expensive

Bimetallic radiators cost about one-third or even one-fifth as much as aluminum radiators. There is a noticeable distinction. Because not everyone can afford them, bimetal products are not as common in our apartments. Compared to aluminum devices, bimetallic ones have a higher hydraulic resistance. Therefore, pumping hot water requires more energy. Higher operating costs result from this.

Furthermore, roughly 4/5 of all radiators of this kind that we import come from China. Of course, this does not imply that any of them are inherently bad, but it does occasionally cause you to pause and consider.

Which radiators for which systems are more suitable

1. Conclusions can now be made after taking into account and contrasting the key radiator attributes. Let’s start by determining which type of heating radiator is better for an apartment in a multi-story building: aluminum or bimetallic. It heats through the central heating system.

  • The pressure in the system can change dramatically, reaching extreme values. Possible water hammer.
  • The temperature will also not be stable, sometimes varying greatly during the heating season and even days.
  • The composition of the coolant is not characterized by purity. It contains chemical impurities, as well as abrasive particles. It"s hardly possible to talk about a pH that doesn"t exceed 8 units.

All of this suggests that aluminum batteries are unnecessary. since they will be killed by the central heating system. Should the electrochemical corrosion not consume, the combination of pressure and temperature will. The last "test shot" is the water hammer. Consequently, if you have to choose between two types of radiators—aluminum or bimetal—only choose the latter.

2. Let’s now examine the heating system that is present in a private residence. Depending on the boiler and system, a properly operating boiler maintains a low pressure of between 1.4 and 10 atmospheres. Not only are pressure surges not observed, but hydrostroke is as well. Additionally, the water’s temperature is constant, and its purity is unquestionable. There won’t be any chemical contaminants, and it’s always possible to measure the pH.

Consequently, aluminum batteries and radiators can be used in such an autonomous heating system; they will function properly. They have a great heat output, an appealing design, and are reasonably priced. Batteries manufactured in Europe are available in stores. Selecting models made using the casting method is preferred. Those who reside in the house itself can also use bimetallic batteries. You can put them in if you’re motivated to do so and have sufficient funds.

Just keep in mind that the market is full of imitations. Should the model—aluminum or bimetallic—stand out for having an unusually low price, you should already be on the lookout. Make sure there is a manufacturer’s marking on each section and the high-quality, full-color packaging to avoid any issues.

What radiators are better aluminum or bimetallic

Manufacturers create heating equipment from a range of cutting-edge products. Radiator replacement is a necessity for everyone eventually, particularly as the heating season comes to an end. There is an enormous variety of products in terms of their technical features and visual appeal. The two primary varieties that are most in demand are aluminum and bimetallic, whose structures are similar but differ in a number of ways. When making a decision, a lot of people are curious about the differences between aluminum and bimetallic radiators and which is superior. That is what we will endeavor to ascertain.

In order to make the right choice, it is necessary to know what the working pressure of the coolant in the heating system of the house, because both options involve installation under different parameters. Each of them is designed for a permissible number of atmospheres and withstands certain temperatures. For this purpose, comparative characteristics are studied in advance. Specialists say that bimetallic is better to use in large buildings with central heating, and for low-rise buildings, aluminum is suitable. But often many dacha owners are limited to budget methods, and if the house is not expected to have an extreme increase in temperatures, does not change the pressure, then they choose the option that costs cheaper.

Response to the quality of the heating medium

Water serves as the primary coolant in homes regardless of size or layout. The contaminants in aluminum radiators are more hazardous than the radiators themselves because they encourage the growth of corrosive processes and the buildup of lime deposits. It is especially important for aluminum radiators when the pH is higher than 8 units.

Hydrogen, a chemical element that can cause plugs and faucets to burst, can be released by aluminum. It is essential to periodically bleed the air out of the battery in order to prevent such issues.

Steel pipes are less picky about the direction in which water flows in a biometallic device. As a result, the value of susceptibility to corrosion is lower. However, oxygen cannot enter the water because it also accelerates the rust-formation process. The high heat output is an advantage. It is observed that the section provides 200 watts of heat energy, of which convection accounts for half and radiation for the remaining portion. High heat transfer is facilitated by internal ribs and is unmatched by other types.

Bimetallic radiators work well in private residences where the heating on/off times can be adjusted. Literally in ten minutes, the room is heated.

Heat is released from the sections of bimetallic radiators. It is lower because the steel core lowers the total heat output. Moreover, thermal inertia is negligible.

Comparative advantages

Many consumers research the specific features of both types of radiators and consult experts to decide which is better: aluminum or bimetallic.

Aluminum-made equipment, for instance, stands out for having a more fashionable and tidy appearance. These radiators are made up of multiple sections that are joined by nipples. A section of aluminum alloy with a silicon additive is pressed under high pressure to create the design.

Are distinguished from one another by the manufacturing process, such as:

  • cast,
  • individual sections,
  • Sectional (extruded), bolted together.

The final version is sealed using silicone or alternative materials. The area of heat output is increased by up to 0.5 m² due to the ribs’ placement on the inner side. The manufacturer also determines reliability.

The extrusion method is characterized by low-cost, low-quality, and simple product production. Cast construction is thought to be more robust.

Two metals are used in the manufacturing of bimetallic radiators: steel and aluminum. The ribbed body is made of aluminum alloy. Elegant aluminum and robust steel combine for great dependability.

Steel or copper make up the core, or interior portion, through which the hot water flows. It is a flat panel on the outside and finned inside. The pipe’s diameter is smaller than its overall size, which accelerates clogging. The consumer’s refined tastes are satisfied by the aesthetically pleasing design, appearance, and compact size. Every steel part is housed inside the building.

General characteristics and disadvantages


The properties of aluminum elements include temperature, pressure, and rate of heat transfer. The aluminum used in standard apartments and country homes can withstand pressures ranging from 6 to 20 atm. withstands heating to temperatures as high as 130°C. maximum heat dissipation resulting in a rapid heating of the space. Installing in different rooms is possible because of the attractive design.

One of the drawbacks is that the apartment building system’s water hammer causes installation issues. However, producers also make more costly reinforced versions that are resistant to high water pressure, among other things. The internal gases produced by the chemical reaction between aluminum and copper fittings are eliminated by automatically installed air diverters. There may be leaks in the spaces created by the sections. Its poor resistance to corrosion is one of its characteristics.


Synthetic properties of steel and aluminum combined biometallic design, which is determined by the indicators of pressure, corrosion, heat dissipation, design solution. More than 90 atmospheres of burst pressure can withstand the construction, and the core is able to withstand from 20 to 40 atmospheres of working pressure in the heat carrier. Due to the aluminum coating, the heat output is achieved (170-190 W). Also thanks to steel (and in some models the core is made of stainless steel) they have high anti-corrosion performance and are durable. Exquisite design and variety in some models are able to satisfy the most demanding consumer. The equipment can serve for more than 20 years, maintaining aesthetic, technical indicators.

The following can be linked to the drawbacks:

  • lower volume of heat transfer fluid, which can lead to an emergency situation while saving the boiler equipment operation;
  • when the heating is switched off, the air in the room instantly cools down;
  • high cost.

It is significant to remember that this kind of equipment comes in different variations based on the manufacturing material. Steel pipes are less expensive than copper pipes. Heating devices with copper elements can be used with copper pipe constructions. They are split into two categories: sectional and monolithic. The inner tube of a monolithic has a set length and can withstand pressures of up to 100 atm.

The most well-liked ones are regarded as sectional. Their primary benefit lies in the fact that the sections can be readily removed to modify the capacity. Both apartments and private homes can use them. Compared to other constructions, they have shorter water passage times for heating.

Conclusion, reviews, tips

This information requires that decisions be made starting with individual characteristics and taking installation specifics into consideration. Installing the products under consideration is comfortable. They can support even plasterboard with their weight. An array of key-shaped instruments is used to install plastic pipes. In contrast to soft aluminum, bimetallic materials do not deform. They are also thought to be more resilient to high pressure, long-lasting, and durable. Similar to the other type, reactions resulting in gassing can be caused by differences in metals.

Aluminum radiators are lighter, more affordable, and have a higher thermal conductivity. The best place for them to be installed is in a private home where the boiler runs continuously at a low head with no pressure spikes. In this instance, the water is pure, free of contaminants, and its temperature is consistently steady. These batteries have a long operational life. The majority of contemporary equipment manufacturers, both domestic and foreign, give careful consideration to the water in the heating system’s quality composition and degree of contamination.

A special consideration should be given to the tightness, which is guaranteed by sturdy gaskets and the lack of crevices where sludge and gases can collect and cause corrosion.

Which heating radiators are better to choose – aluminum or bimetallic

A great deal has been written and discussed regarding the selection of water heating appliances for individual homes and apartments. Advertisers trying to sell their products frequently use contradicting information or information that is just taken straight out of thin air. particularly a lot of hints regarding the superiority of aluminum or bimetallic radiators. We will make an effort to shed light on this matter and convey to typical homeowners how things actually work.

About the design of heating devices

Knowing how contemporary batteries work will make it easier to answer the debate over whether pure aluminum or bimetal radiators perform better. It is important to clarify right away that aluminum in this context refers to its alloy with silicon, or silumin, as this metal is not utilized in its pure form. Within the alloy, impurities such as iron, copper, manganese, and zinc make up less than 1% of its composition, with silicon accounting for 14% of the total. A product called bimetal is composed of two distinct metals, in this example, steel and silicon. Almost everything is in order, though.

Aluminum radiator section design

Sections of aluminum radiators are made of silumin through extrusion or casting. A complex shape is made up of these components in each section:

  • siluminous body (radiator body);
  • Two longitudinal channels with a diameter of 25 mm with right and left threads on the edges for twisting sections;
  • vertical channel of round or oval cross-section measuring 25-45 mm, connecting the horizontal ones;
  • Vertical convection ribs on the sides and front of the body for better heat exchange with air.

Note: Steel nipples with an inch-diameter cylindrical thread are used to twist sections together. We will find it helpful to compare the batteries later on, thanks to the use of steel fasteners.

Design of Bimetallic Radiators

Bimetallic radiators also consist of an aluminum alloy with a steel pipe frame that is welded inside. The goal is to increase the product’s structural strength and dependability while removing silumin’s contact with the coolant.

Partially bimetallic batteries, in which the steel pipes are only terminated in horizontal channels, are also available for purchase. Talking about it or purchasing such a product is pointless.

Comparative analysis of radiators

What worries the buyer of heating radiators the most? Three items:

  1. To make the radiators warm well and serve for a long time.
  2. Product price.
  3. Their appearance.

As most contemporary sectional radiators have nearly identical designs and are coated in a long-lasting white polymer coating, visual comparisons can be disregarded right away. Selecting a heater at the appropriate height for the location of installation is the only thing left to do.

Bimetallic products are identical to aluminum products from the outside.

The initial two factors—aluminum or bimetallic—remain to be considered when determining which radiator is superior. The comparison criteria sound like this in technical terms:

  • good heating is ensured by the heat output of the heater;
  • the duration of operation depends on the working pressure and the ability to resist the influence of low-quality coolant (corrosion resistance);
  • the price concept refers to 1 section of the device.

Citation. Bimetallic batteries became necessary because of the high pressure and poor coolant quality in the central heating systems of apartments and private homes. From this perspective, it is therefore preferable to compare them to aluminum.

Various techniques for lateral section finning

Comparing heat output

The exceptional thermal conductivity of aluminum and its alloys is 220 W/m*K. This indicator ranges from 150 to 180 W/m*K for radiator silumin. The only material that transfers heat more effectively than them is copper (λ = 380 W/m*K), but batteries are not made of copper. A steel intermediate that has a significantly lower thermal conductivity of 70 W/m*K is present between the aluminum body and the heat transfer medium in bimetallic radiators.

The latter will produce less heat if we assume that the temperature and movement speed of the water in the devices made of silumin and bimetal are equal. Steel won’t have as much time as silumin to remove the heat from the heat carrier. This is a theoretical statement.

The heat transfer characteristics of siluminous and bimetallic sections are essentially the same as those stated by manufacturers. Simply look at this table, which provides information for goods from two well-known manufacturers, Global (Italy) and Rifar (Russia), to see for yourself:

Note: The values of heat transfer are given under specific conditions. Specifically, there should be a temperature differential of 70 °C (or 90 °C and 20 °C) between the coolant and the air in the room. This indicates that the batteries will actually release heat in roughly 1.5 times less time.

It will be evident from comparing the section sizes of the models that are being shown that they can all transfer roughly the same amount of heat flow into the space. Thus, the conclusion is that, in terms of this criterion, there is no difference between the two types of radiators; they both heat as efficiently.

Which radiators are more reliable

The material’s resistance to corrosion and the pressure the radiator is intended to withstand determine how long a radiator will last when used in the central heating network. Many terrifying tales about pressure can be found online, but they all basically say that aluminum sectional radiators should not be installed in apartments with central heating because the water hammer and higher water pressure will cause them to explode.

In actuality, siluminous products are tested at 24 Bar and are intended for a working pressure of at least 16 Bar for all known manufacturers. This is true even though, even with tests and other operating conditions taken into account, the pressure in the heating network hardly ever reaches 14 bar. The table, for instance, displays the performance attributes of various well-known brands’ products:

Additionally, we recommend watching the video of our expert Vladimir Sukhorukov conducting a burst test on a steel radiator in order to debunk the myth surrounding aluminum batteries. Be aware that steel appliances are made to withstand pressures of only 6 bar, in contrast to aluminum appliances.

Global bimetallic model sections are tested to 50 bar and can withstand up to 35 bar when in operation. Other brands’ characteristics are displayed in the following table:

These pressure values are simply nonexistent in any heating network, with the exception of industrial enterprises’ steam systems. Thus, it is reasonable to wonder why more costly bimetal should be installed when aluminum is more than adequate. Most likely as a result of the coolant’s corrosive action, which we will discuss later.

Visit your heating company and request to view the system’s pressure testing data to ensure the logic behind the reasoning is sound (pressure testing is typically conducted at 12 bar). and after that contrast them with the technical specs of various kinds of heating apparatuses.

Coolant sludge in the battery ducts and heating pipes

Due to the extreme wear and tear of underground mains, poor coolant in district heating systems is a problem in all post-Soviet countries. Because of this, only cast iron batteries are "friendly" with this kind of water; the other batteries will not fare well:

  1. Silumin remains resistant to corrosion if the hydrogen pH value of the coolant does not exceed the range of 7-8.5 units. A more acidic environment has a destructive effect on the alloy.
  2. Abrasive particles moving with water through the channels of the heater, relentlessly bombard the surface of the aluminum alloy. It is true that a fistula from such exposure may appear after many years.
  3. Steel pipes of bimetallic radiators also corrode and "overgrow", although here, too, it will take quite a long time to put the product out of operation.

Prominent producers of silumin batteries typically coat the inner walls of the channels with a tri- or hexavalent chromium layer for protection. Application technique: electrochemical (passivation). By taking such steps, the chances of bimetallic and aluminum heating radiators being equally vulnerable to corrosion are practically equalized.

Which is cheaper?

In general, bimetal costs 20–25% more than aluminum, based on price statistics. In addition, because of a separate component called the pipe, batteries with steel frames are limited in terms of channel cross-section size. We were able to confirm that the other benefits and drawbacks of sectional alloy radiators are essentially the same.

The table featuring products from the same well-known brands effectively illustrates the price differences:

Note: Prices for various companies’ products are based on the most common size, which is 500 mm.

Bimetal Aluminum
More durable and resistant to corrosion Lightweight and easy to install
Higher heat conductivity for efficient heating Lower cost upfront
Suitable for larger houses with higher heating demands May require more maintenance over time

There are a few things to take into account when deciding between aluminum and bimetal radiators for your home. Each option has benefits and drawbacks of its own, and the choice ultimately comes down to your own requirements and tastes.

Bimetal radiators are effective and long-lasting. They are robust and resistant to corrosion and damage because of their steel core. Furthermore, the outstanding heat retention qualities of bimetal radiators guarantee even warmth throughout your house. Nevertheless, compared to aluminum radiators, they are typically more costly and heavier.

Conversely, radiators made of aluminum are less expensive and lightweight. They are great for quickly warming rooms because they heat up quickly. However, problems with water quality, such as corrosion and limescale buildup, are more likely to cause damage to aluminum. Furthermore, it’s possible that aluminum radiators don’t hold heat as well as their bimetal counterparts.

Prior to choosing a choice, you should evaluate your heating requirements, your spending limit, and the unique features of your home. Take into account elements like the rooms’ sizes, the heating system that is currently in place, and the standard of your water supply. Speaking with an expert in heating systems can also yield insightful advice.

To sum up, radiators made of aluminum or bimetal each have advantages and disadvantages. Aluminum radiators are less expensive and lightweight, but bimetal radiators are more resilient and retain heat. The optimal decision ultimately comes down to your personal priorities and circumstances. You can make a well-informed choice that guarantees your home will be as comfortable and efficient as possible by carefully considering the options and, if necessary, consulting an expert.

Video on the topic

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TOP 4 heating radiators! For city apartments and country houses!


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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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