Bimetallic radiators: views, ratings, how to choose bimmetalicheskie battery

The efficiency of the battery determines the speed and quality of heating. The market offers all kinds of modern equipment solutions. One of the options are worthy bimetallic heating radiators, heating systems meet the essential requirements: strength, resistance to waterhammer, high heat dissipation, and durability.

We will talk about how to choose the right heating device in the manufacture of which used two metal. In our proposed article described in detail the popular varieties among consumers. Given their characteristics, are listed the leading manufacturers.

The content of the article:

  • Structure bimetallic radiator
  • Features of various heating convectors
    • Bimetallic radiators and polubimetallicheskie
    • Sectional and monolithic model
    • Copper or steel core?
  • Technical-operational characteristics
  • Comparative analysis: bimetal and competitors
  • What to consider when choosing a radiator?
    • Opportunity Assessment - thermal design
    • How to avoid fakes: a radiator inspection
  • Rating popular manufacturers
    • Location # 1 - Global
    • Location # 2 - Sira
    • Place # 3 - Rifar
    • Place # 4 - Tenrad
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  • Conclusions and useful videos on the topic

Structure bimetallic radiator

Externally bimetallic models resemble ordinary aluminum radiators. The difference lies in the inner content. The design of composite products consisting of two basic elements: an inner steel pipe and an external housing figurno fin of aluminum panels. Some used instead of steel radiators copper.

coolant circulation occurs by internal steel or copper pipes. Due to the corrosive inertia radiators do not rust and do not react with the reactive coolant. External and internal manifold elements are connected by spot welding or the outflow pressure.

On physical and performance properties of the batteries are suitable for mounting in any rise apartment buildings and arrangement of local heating system cottage buildings.

The structure of bimetallic radiator

The bimetallic structure determines device characteristics. Steel core explains the resistance to the corrosive environment and endurance to the pressure drops, the aluminum "shell" improves heat transfer to the heat sink and facilitates

Features of various heating convectors

It should be understood the difference between the different kinds of batteries of the two metals. Composite products to classify according to the following criteria: the composition of the inner core, external performance and the type of metal used.

Bimetallic radiators and polubimetallicheskie

People often confuse the true bimetallic battery with the "half-breeds" - polubimetallicheskimi counterparts.

"Pure" bimetal

Aluminum involved for manufacturing the outdoor unit casing. Core convector 100% consists of stainless steel or copper. In the production process of the tube, placed in special molds are filled under pressure with aluminum - is formed sealed construction.

steel core

The outer shell is not in contact with the coolant and acts as a heat exchanger. The main feature of bimetallic radiators - high strength and a guarantee against leaks

Complete bimetal endures pressure centralized and independent heating systems.

Polubimetallicheskie battery

Inner "skeleton" of the radiator is assembled from two metals: vertical guides - stainless steel horizontal pipe - aluminum. The reverse combination.

Such metals alliance is unable to ensure adequate reliability of communication of central heating. The coolant may contain alkali, which in conjunction with aluminum provokes the appearance of corrosion. Destructive processes eventually "pass" on the steel components of the radiator.

Furthermore, the integrity of the product may be compromised due to thermal expansion of the metal - the boundary temperatures are possible leakage.

Polubimetallicheskie battery

Externally polubimetallicheskie radiators do not differ from high-grade bimetallic counterparts. "Half-Blood" provides lighter weight and undervaluation

From buying low-quality composite is better to give, especially when it comes to central heating.

Sectional and monolithic model

Among the variety of bimetallic radiators are two types of structures:

  • sectional:
  • monolithic.

Models collected from sections attract variability characteristics. They provide the opportunity to purchase the device with the exact values ​​of heat required for the heating of premises. Monolithic such advantages do not possess.

Matched systems

Movable radiators, panels which are connected by means of nipples. The horizontal pipe sections have separate sections multidirectional thread for mating fastening nipples and sealing lining.

sectional radiators

Matched models are more popular due to the practicality - it is possible to adjust the heat output by adding or subtracting the desired number of sections. An additional plus - maintainability

Disadvantages sectional radiators:

  • joints - weaknesses collectors where the probability of a leak;
  • the limited operating pressures - up to 20-30 bar.

To weighty disadvantages are also partial ingress of coolant for aluminum "shirt" when flowing.

monolithic devices

Devoid of the above disadvantages solid modification. Molded radiator able to withstand pressure surges within 100 atmospheres.

monolithic radiator

Cons monolithic batteries: there is no possibility to vary the heat output, overpriced - 20-30% more expensive sectional models with similar parameters

For high-rise buildings (10 floors and more), experts recommend choosing whole radiators, as there will be considerable pressure in the heating system.

Copper or steel core?

Most manufacturers offer hybrid batteries with a steel tube frame. The main reason - the affordability of metal and good strength properties. Symbiosis steel and aluminum allowed to achieve resistance to vibrations Heating system pressure, Increase heat convector and reduce its inertia.

Copper-aluminum radiator

The radiators "copper + aluminum" heat exchange tubes are made of copper. The heating panels - aluminum plate, welded to the frame internal copper

The advantages of batteries with a copper core:

  • the probability of corrosion is absent;
  • copper tubing carries any water hammer - the best option for use in domestic central heating systems;
  • high efficiency of the device - copper heat outperforming steel.

Copper-aluminum radiators have a long life - more than 50 years. Lack of copper modifications - the high price.

Technical-operational characteristics

All the basic parameters indicated in the passport radiator heater.

Not to be mistaken with the choice, you need to understand the meaning of the following characteristics:

  • heat transfer;
  • operating pressure and temperature;
  • spacing;
  • dimensions;
  • capacity, weight section.

Thermal power. This parameter indicates the amount of heat transmitted from the battery in the room atmosphere at a predetermined temperature coolant (+ 70 ° C). The indicator is measured in watts.

battery heat dissipation

The average value of the composite heat radiator 140-190 watts. The run values ​​is due to the dimensions and characteristics of the section performance of devices from different manufacturers

Based on the thermal capacity of one section, it calculates the required battery performance for the entire room.

work environment indicators. Maximum fluid pressure depends on the thickness of the steel core. Selection of strength - at the discretion of the manufacturer. The parameter value varies from 15 to 35 bar and is determined based on the battery operating conditions.

An important characteristic - the boundary temperature of the coolant. All full Bimetals able to withstand + 90 ° C. Some manufacturers claim a higher thermal stability.

Characteristics bimetallic radiator

The maximum temperature stated in the passport of the equipment of different trading positions: Global Style - 110 ° C, Tenrad - 120 ° C, Altermo - 130 ° C, Grandini - 120 ° C

radiator size. Dimensional characteristics include the following:

  1. center distance - "run" between the axes of the horizontal collectors. Standard value - 20-80 cm. Vertically oriented models with increased center distance is used when the room layout is not suitable for horizontal installation of radiators.
  2. geometric parameters determine the height, width, depth section. The total height of the radiator often exceeds the inter-axle range of 6-8 cm. Typical width of the ribs bimetallic models - 80 mm.

Depth section is 75-100 mm. Some manufacturers have added other than the outer panels in parallel rib structure to increase the heating efficiency due to convection currents.


Overall dimensions: a - the height of the section, b is the distance between the horizontal axes, with the battery - the depth, d - the width of one section. Most running product from the core a height of 35 cm, 50 cm

The volume and weight. The bimetallic modifications coolant circulated through the core of circular cross section unlike aluminum counterparts with oval cross section heat conductor. Capacity one bimetal section is less than the volume of aluminum sections with identical sizes.

For example, in convectors with interaxle range 500 mm fullness coolant is about 0,2-0,38 l, at the height of the core 350 mm - 0.15-0.25 l.

Weight standard bimetallic battery dimensions 580/80/80 mm (height / width / depth, respectively) and the center distance of 50 cm is 1.8-2 kg. Less weight - one of the signs polubimetalla.

Comparative analysis: bimetal and competitors

Before choosing a bimetallic radiator or other desirable to compare it with the closest possible competitors. For composite convectors is aluminum, cast iron, steel battery.

Assessment should be carried out on the main criteria:

  • heat transfer;
  • tolerance to extremes of pressure;
  • durability;
  • easy installation;
  • appearance;
  • durability;
  • price.

heat loss. On the effectiveness of the heating units are the leaders aluminum, bimetal took a respectable second place. steel and cast iron radiators noticeably lose.

Recoil heat metals

For alumina typical minimum thermal inertia - after the launch of the air system in a room warmed for 10 minutes

Resistance to waterhammer. The most hardy bimetallic aggregates, capable of withstanding up to 40 atmospheres (sectional model). Maximum working pressure on an aluminum heating system - 6 bar, steel - 10-12 bar, cast iron - 6-9 bar.

It is able to withstand multiple bimetal hammering a centralized heating system. This property - a key argument in favor of composite radiators for apartment buildings.

Chemical inertness. According to this criterion, the position was as follows:

  1. Cast iron. Material indifferent to hostile environments. Cast iron radiators can be used for decades, transporting, "alkaline", "acidic" environment.
  2. Steel and bimetal. By itself, the steel core endures exposure to corrosive components. The weak point of the steel pipe - the interaction with oxygen, contact with which causes rust.
  3. Aluminum. The metal reacts with the various impurities in the water.

Particularly susceptible to the effects of aluminum wall acid environment - pH coolant must be within 8. Otherwise actively developing corrosion.

Easy installation. In terms of easier installation aluminum and bimetal products. Cast iron radiators are more difficult to install because of their impressive mass.

Compare radiators

Durability leaders are composite and cast-iron battery. Aluminum and steel products must be replaced after 10-15 years, subject to operational requirements. Among the designated battery bimetallic most expensive

It can be concluded. Buying a bimetallic radiator clearly justified to build a heating network in a building where there is a risk of pressure surges and coolant contamination. In a private home with a stable operation of the boiler feedwater and filtration can be used in heating unit available aluminum radiators.

What to consider when choosing a radiator?

To achieve proper thermal effect necessary to calculate the total battery capacity. Bimetallic equipment - an expensive purchase, so you should take care of its durability. Conscientious performance of the radiator ensure trusted manufacturers.

Opportunity Assessment - thermal design

Having defined a suitable technical characteristics and the dimensions of the bimetallic radiator, it is necessary to calculate the desired number of sections.

Calculating the number of sections

Basic formula: N = P tot / Ppasp where Ptot... - the required battery power for an entire room, Ppasp. is the thermal capacity of the section of accompanying documents

Index section is taken from the heat radiator of the passport, and the total power to be calculated.

Calculation of the area

The normalized value of heat capacity per 1 sq residential space for secondary climate strip provided standard ceilings (250-270 cm):

  • the presence of one of the window and the wall with access to the street - 100 W;
  • room window, the two adjacent walls to the street - 120 W;
  • multiple windows and "external" wall - 130 watts.

Example. Power section - 170 W, the total area of ​​the heated room - 15 sq.m. Additional conditions: window - 1, Exterior wall - 1, ceiling height - 270 cm.

N = (15 * 100) / 170 = 8.82.

Rounding is done upwards. It means for heating the room necessary to use 9 sections 170 watts.

Calculation of the volume

SNP separately regulates the amount of heat output per 1 cubic space of 41 watts. Knowing the volume of the heated room can easily calculate the heat loss of the entire battery.

Example. Space heating with the previous parameters. For the purity of the experiment the power section is left unchanged - 170 watts.

N = (15 * 2.7 * 41) / 170 = 9.76.

It is necessary to install the radiator 10 sections. The second calculation is considered to be more accurate. In the calculations, we should pay attention to sources of heat loss in the room.

Accounting of heat loss

The calculated value must be increased by 10%, if the apartment is located on the ground / floor, the room has a large window or a wall thickness not exceeding 250 mm

How to avoid fakes: a radiator inspection

Besides the passport data analysis, it is useful to carry out a visual assessment of the product. Some manufacturers in the pursuit of customers tend to "embellish" their products, bringing in the documentation incorrect data.

First of all, pay attention to the thickness of the core and the aluminum "shirt", dimensions, weight and quality of components.

Steel core. The minimum thickness of steel tube - 3 mm. With smaller sizes significantly reduced claimed strength of the product - resistance to waterhammer and the development of corrosion processes.

The thickness of the steel core

thin metal walls coolant open access to an aluminum "shell", which means chemical activity begins to rapidly deteriorate

Result poor steel core - formation of through holes and creation of emergency for heat.

radiator fins. Aluminum panel should be checked for strength - they should not bend with the effort the fingers of one hand. The minimum thickness of the panels - 1 mm.

Better to choose a model with shaped channels between the ribs. Formed converger airflow rate increases, increasing the rate of convective heat transfer.

quality painting

To reduce injury outer edges round off the aluminum panels. The surface should not be sagging, color irregularities and "gaps"

Dimensions and weight. Customized possible to manufacture heaters with the width of the section less than 80 mm. However, the model shop with a mismatch is likely a fake.

Some manufacturers to reduce production costs significantly cut down the width of the interior edges, "masking" them for the front panels of standard size. This measure impairs heat the bimetal radiator.

Completing the battery. Check the quality of the seals and nipples on the site almost impossible. It is necessary to rely on the manufacturer's name and the warranty period. Trustworthy companies to ensure smooth operation of 15-20 years.

Rating popular manufacturers

The review includes high-quality foreign and domestic heating systems products, adapted to changing heating conditions.

In practice, well-proven products companies:

  • Global Style (Italy);
  • Sira (Italy);
  • Rifar (Russia);
  • Tenrad (Germany).

Location # 1 - Global

It is a recognized leader in the production of heating radiators.

The company produces three series of bimetallic battery:

  • Style - basic characteristics;
  • Style Extra - compact dimensions;
  • Style Plus - maximum heat transfer.

Sections are connected paronite gaskets, ensuring tightness of joints. Effective heat transfer between the metal achieved by casting aluminum "shirt" under pressure.

Global Style Radiators

Additional Features: pressure - up to 35 atm, the diameter of the connection - ¾ or ½ inch, coolant temperature - 110 ° C, the outer shell - double coloration

Location # 2 - Sira

The Italian manufacturer is positioning its product as a premium product. Devices have gained popularity due to the strength of consumers and attractive design. The manufacturer provides a warranty of 20 years on a series of high-grade bimetallic radiators Sira Ali Metal.

Sira Ali Metal

Product features Ali Metal: spacing - 350/500 mm, the heat transfer of models - W 187/141 (respectively, the distance between the axles), pressure in the heating system - 35 atmospheres

Place # 3 - Rifar

Domestic manufacturer has developed a wide range of bimetallic radiators:

  • Base - model with a center distance of 200/350/500 mm, warranty from Rifar - 10 years;
  • Forza - enhanced outer coating resistant to scratching and mechanical damage;
  • Alp - small depth (75 mm);
  • Monolit - piece radiator.

Monolit series batteries differ the highest rate of efficiency at high pressure coolant.

Rifar Monolit

Technical data: Operating pressure - 10 MPa, burst pressure - 25 MPa, maximum temperature - 135 ° C, the warranty period - 25 years

Place # 4 - Tenrad

German quality bimetal for centralized and independent heating networks. Acceptable use in gravity, and pumping elevator systems with one- and two-pipe wiring.

Distinctive features:

  • vertical tubes thickness - 1.8 mm, the collector walls - 3.6 mm;
  • three-row fin;
  • side panels disposed at a slant, which creates the diffuser effect convective flow.

Two-layer enamel coating of high quality coatings - by heating device does not emit harmful vapors.

radiator Tenrad

Tenrad products are designed to operate in a system with fluid pressure to 35 atmospheres. Bimetallic radiators are certified and meet European standard EN442

With the rules for calculating the power and the number of radiators for heating devices introduce next article, Which is worth reading before purchasing the equipment.

Conclusions and useful videos on the topic

Video review demonstrates the design features composite radiators and the essential requirements to be met by a quality appliance:

Full Bimetallic radiators combine the positive characteristics of both materials. Batteries have a high thermal capacity, resistance to waterhammer and excellent decorative properties. Acquisition - justify the investment if they buy certified products.

Tell us about how to choose a bimetal device to own an apartment or a country house. Share what argument was decisive in your choice? Leave, please comment in the box located below, ask questions, post themed pictures.

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