What is better cast iron batteries or bimetallic


Installation and cost of equipment

If you compare in terms of installation of radiators, then there are more problems with cast-iron radiators, they are very heavy, so not everyone can lift them alone. They need strong fasteners, and in addition to brackets the wall should be strong, plasterboard can not withstand such a load.

Bimetal products are light in weight and pleasant to work with, they can be attached to the wall with any surface. In this case, bimetal wins.

If you take cast-iron radiators of domestic production, they are inexpensive. Now there are models in the retro style, this option will cost significantly more expensive, since they are made by artistic casting method.

Bimetal of domestic manufacturer is more expensive than conventional cast-iron radiators, and the price of Italian batteries is even higher.

What radiators are better bimetallic or cast iron

Choosing what to put in your home cast iron or bimetallic radiators, the consumer can see with his own eyes how far heating technology stepped in more than half a century. Despite the fact that the first batteries made of cast iron appeared in the houses a long time ago and have changed little since then, it is rash to think that they are definitely outdated and lose all the more innovative designs. To unequivocally answer the question of what is better specifically for your home, you must compare the characteristics of these types of radiators and the conditions under which they will be most effective.

For many consumers parting with the old cast iron radiators is alarming. Although they are annoying and often noisy, but for decades they have been warming apartments, requiring little maintenance. Today, the parameters of cast iron radiators for heating are such that they are qualitatively different from their Soviet “counterparts”, still not pretending to the attention of their owners.

  • If the old “harmonica” weighed more than 7 kg per section, the modern cast-iron batteries. 4 kg, which greatly relieves the load on the wall and fixtures.
  • The volume of Soviet analogues was 1.5 liters, while the new models have 0.8 liters, which is almost half as much.
  • Their price is still the lowest on the market. Although aluminum is also considered an inexpensive metal, a comparison of castiron and aluminum radiators will show that the former are more cost effective.
  • Modern cast iron batteries consist of sections, which have become much easier to install, add or remove.
  • Their thermal power is still capable of effectively heating apartments, so when you have to change the old Soviet design, many consumers wonder what radiators are better: cast iron or bimetallic, aluminum or steel? Or put a new cast iron variant instead?

Such questions and doubts would hardly arise if people knew the peculiarities of centralized apartment heating system and technical parameters of modern radiators.

MUSTART 12V 200Ah LiFePO4 Battery, Serviceable with Cylindrical Cells!

Variants of calculation and installation of a bimetallic radiator

The most common method is to calculate the radiators according to the area of the heated room. On the average, about 100 W of thermal capacity of a radiator per 1 square meter of a room is required.

For this purpose we calculate the area of a room (the most exact assignments are specified in the technical passport of an apartment or a house) and find out the power of one section. The manufacturer always specifies it in the documentation.

In new buildings with facade insulation, good thermal insulation and multiple glazing can reduce the wattage per square meter. In new buildings often install bimetallic radiators at a rate of 75 to 80 watts per square meter.

Due to their lower weight bimetallic radiators are very easy to install. The work begins with the laying of a parallel line on the wall. Then the following installation steps are carried out:

  • pipe facing, threading;
  • installation of a Maevsky faucet in front of each radiator;
  • installation of anchors or dowels;
  • hanging a radiator;.

Brackets provide a distance from the wall of at least 5-7 cm. This ensures that even at the maximum operating temperature of 90 C, the wall coating will not be damaged. The distance from the floor should be at least 15 cm, which will provide the necessary space for cleaning.

Comparison of bimetallic or cast iron heating radiators

The traditional variant of heating devices in apartment buildings for many years are cast-iron batteries. But today more and more often more modern bimetallic radiators are used as an alternative to them.

This type of devices consists of steel pipes in the aluminum housing with ribs that improve heat transfer. They are much more expensive than traditional batteries.

Many users are faced with the question: choose bimetallic or cast iron heating radiators. In order to make the right decision, one should take into account the main characteristics and consumer properties of both types of devices.

Let’s compare the heat output of radiators

Cast iron. Again, let’s start with the traditional cast iron radiators. They are so slow that sometimes you can freeze, waiting until the cold room is warmed up. But it takes a long time for such radiators to cool down, and that is another matter. After all, it often happens when the heating is turned off. Because of an accident or repair, for example. And near a cast-iron radiator you can still get warm for quite a long time.

The great advantage of cast-iron products is that they heat the room not only by convection, but also by radiant. That is, when they are turned on, in addition to the air, the objects close to the radiators become warm. As for heat output, it is usually given for a single section and ranges from 100 to 160 watts. These are average values that may vary from model to model.

Bimetal. The good thing about these radiators is that they heat up quickly. But they also cool down just as quickly, alas. Heating in them is carried out mainly by the principle of convection. the radiant component is much smaller. This is a disadvantage. Heat output of the section models is comparable to cast iron products. This figure ranges from 150 to 180 watts (on average). If we compare the speed of heating the room, then they of course beat the cast iron.

Heat output: Cast iron | bimetallic

What is better. cast iron batteries or bimetal?

For those who have started repair and modernization of the heating system, the question is crucial: to keep the traditional cast iron batteries or to give preference to the new bimetallic? Let’s consider this issue in three directions: heat output, operational reliability, possibility to save on heating.

The unique feature of cast iron is a thermal spectrum, which scientists today recognize as unique and the most favorable for a man, that is, cast iron batteries are absolutely harmless in terms of radiation. As for the rate of heat transfer, cast iron is inferior to bimetal in heating the room, but keeps heat longer during cooling (in case of failure of the main source of heat (boiler), the house will not cool quickly).

Cast iron batteries are ideal for homes with small children, but remember that the thermal inertia of cast iron does not allow you to quickly change temperature, that is, the boiler must always work, because if the house is completely cooled, it will then be warm for a long time.

Operational reliability

Cast iron is a fragile material, radiators do not hold the blow, and a damaged section can not be repaired. The heat output of cast iron batteries decreases year by year due to the scale formation on the inner walls. Characteristics of bimetallic radiators are more stable over time, and they are not afraid of shock loads and are more reliable.

The high thermal inertia of cast iron does not allow to quickly change the modes of operation of the whole system, so even if you install a boiler in the system with the automatic weather control, the savings will be modest. Low thermal inertia of bimetal combined with automatic boiler control gives significant savings, as proven both theoretically and experimentally. You can order the bimetal radiators here. Here you can familiarize yourself with the range, brands, prices, and pre-determine your choice by calling the consultants of the call center.

Bimetallic or cast iron radiators for heating?

In order to compare bimetallic heating radiators with cast iron radiators, it is necessary to get acquainted with the characteristics of both heating devices.


To begin with, such material as cast iron, has been used for the manufacture of batteries for a very long time.

Modern models of cast iron radiators have a very attractive design, cast iron radiators are also available in retro style, which will be a worthy decoration of the interior, especially made in the classical style.

  • externally look very attractive;
  • cost such batteries are inexpensive;
  • are characterized by durability;
  • Easy to install;
  • The material is characterized by strength and reliability;
  • resistant to corrosive processes;
  • there is a wide choice of such products on the market, made in different designs and colors.

Despite the large number of advantages, a number of disadvantages stand out:

  • Cast iron is not a very good conductor of heat, in connection with this, such radiators work with little efficiency.
  • In order for the metal to warm up and begin to give off heat, you will have to wait quite a long time.

Thus, based on the technical and operational characteristics of cast iron batteries, we can conclude that such devices will cost a small sum and will last for many years. But at the same time, due to the low heat transfer, the room will warm up slowly and not well enough.


Bimetal heating radiators are more advanced aluminum batteries. Originally, bimetal radiators were characterized by a short service life, as aluminum is very sensitive to the aggressive effects of the environment and prone to destruction under the influence of the coolant.

But over time, manufacturers decided to add a steel component to the design. This alloy is characterized by strength and reliability. Thus, the service life of bimetallic radiators has become higher.

Currently, bimetallic radiators for heating are recognized as one of the best, since they combine the advantages of steel and aluminum.

The main advantages of bimetallic radiators are the following:

This Little Battery can put out 80A

  • Have a high reliability;
  • Are able to withstand the aggressive effects of the environment and hydraulic shocks;
  • long service life;
  • low weight;
  • are very attractive in appearance, so they will perfectly fit into any interior;
  • have high thermal conductivity and efficiency.

The main disadvantage of bimetallic radiators is their price. They are considered the highest quality, respectively, and their cost is high.

In the market, among the abundance of various models, you can find a bimetallic radiator, which at its price has not gone far from the cast iron one. But you should understand that the quality of such a unit is low. So it is better not to save money and buy a good radiator.


In order to clearly show the differences between cast iron and bimetallic radiators for heating, it is necessary to separately consider their technical characteristics:

  • Heat output. Cast iron radiators range from 100 to 160 Watt per section. Bimetallic radiators range from 150 to 180 W.
  • Resistance to high pressure. Despite the fact that cast iron is considered a fairly reliable metal, it can only withstand 12 Atm, while bimetal 20-50 Atm. All figures depend on the specific model.
  • Resistance to low-quality heat transfer medium. The negative impact of the environment does not affect the efficiency of cast-iron radiators, so they can serve for decades. Aluminum and steel alloy radiators also withstand the adverse conditions. But in the spring, after the system is drained, air gets into them, resulting in corrosion.
  • Maximum water temperature. For cast iron 110 ° C, for bimetal 130 ° C. However, it is worth noting that each of the species is well tolerated temperature fluctuations.
  • The service life is higher in cast-iron radiators, they can serve for more than 50 years. And the bimetallic ones are much less, no more than 25 years.
  • Cost. Cast iron radiators are twice cheaper than aluminum.

Cast iron or bimetallic radiators. advantages and disadvantages, which is better to choose

Centralized heating systems are characterized by quite severe loads. in particular, we are talking about intensive corrosive effects and large pressure drops. In such conditions, only two types of radiators can function normally. bimetallic and cast iron. Both types have their own features, which you need to know in order to choose the most suitable option for heating. About what radiators are better. cast iron or bimetallic, and we will talk in this article.

| Denial of responsibility | Contacts |RSS