bimetallic or cast iron? Review + Video

bimetallic or cast iron? Review + Video One of the important differences between humans and animals is the constant improvement of living conditions. If animals exist, adapting to the environment, then a person has chosen a different path - changing the environment for their own needs and convenience.

You can adapt your home, your home in any way you like, but the most important indicator of comfort will always be warm.

[contents ]

The main points to pay attention to when choosing heating radiators

If the cold reigns in your house, then the most sophisticated the interior is no longer pleasing to the eye, and an old Russian proverb immediately comes to mind: "It is better to be covered with sweat a hundred times than once with frost" .

Heat in our homes is provided by home heating radiators .

bimetallic or cast iron? Review + Video Old Soviet cast-iron radiators still remain in some apartments, but every day more and more people are thinking about replacing them. With today's variety on the heating market, it is important not to get lost and find the right one for you.

In this article we will understand the main pros and cons of different types of heating radiators and try to give some recommendations for their selection. To do this, we will compare the technical characteristics of the most popular products among modern heating radiators. At the same time, let's not forget that most of our apartments use a centralized heating system , installed in our Soviet past, with all its many disadvantages.

Of course, on the one hand, a centralized heating system for an ordinary citizen is a useful and very convenient thing, since it eliminates a number of problems: such as the need to install and configure a boiler. bimetallic or cast iron? Review + Video

However, it also conceals some dangers that are worth remembering and from which to start when choosing heating batteries:

  • bimetallic or cast iron? Review + Video Firstly , and this will be the most terrible for your heating systems: a sharp jump in pressure in the pipes. The fact is that earlier, in the Soviet years, when our existing heating system was launched, valves were used to regulate the supply of the coolant (in our case, water). They had smooth dynamics, but now they use ball valves, which speeds up the process of shutting off the water, but can cause a sharp jump in pressure. Even the most short-term races are fraught with rupture of the radiator, pipes, damage to your property and flooding of neighbors.

  • Secondly , water goes a long way through our communications and absorbs a considerable amount of chemicals that can cause corrosion and destruction of both the pipes themselves and directly heating radiators.
  • Thirdly , sludge particles, which somehow get into the water, scratch the pipes from the inside, eventually squeezing them through.
  • And fourthly, unfortunately, in our country, the water temperature is not always constant: either you can barely touch the battery, then it is barely warm, or even completely cold.

And so, here are the main parameters that you should pay attention to before installing the heating radiator:

  1. At the pressure declared by the manufacturer, at which the radiator operates - it must exceed the pressure of your heating system. For old-style houses, this is 5-8 atmospheres, and for multi-storey buildings - 12-15.

  2. bimetallic or cast iron? Review + Video The ability of a radiator to withstand a water hammer - in our current realities, it is almost impossible to protect yourself from it. But to anticipate - sometimes, for example, if a hum or clicks are heard from the pipes - this is already a reason to contact the utility service.
  3. On the heat transfer of the radiator, it depends on the material from which the heater is made.
  4. The thickness of the wall and their additional coating - it must be resistant to chemical influences, and the walls themselves are wide enough not to wipe with sand and sludge.
  5. For the duration of service, the less often we have to install heating radiators, the more profitable it is for us.

  6. Well, and of course, in appearance - now there are various models that can not only warm an apartment well, but also complement your interior.

Types of heating radiators

Now let's take a closer look at the types of devices. And let's start with the copper ones.

Copper radiators

Copper radiators are made of seamless copper pipe with a diameter of about 28 mm. , and is complemented by copper ribs and a wooden casing.

Copper has a high thermal conductivity, 2 times higher than aluminum and 5-6 times higher than cast iron and steel.

bimetallic or cast iron? Review + Video In addition, copper heating radiators allow the use of heat regulators.

The batteries of this model contain very little water, which ensures quick heating - about 3 minutes. This is an undoubted plus , especially if you own an autonomous heating system.

Copper is ductile, resistant to corrosion and poorly rubbed.

It should be noted that 90 hours after the radiator is put into operation, an oxide layer forms on the radiator walls, which additionally protects your device from damage, both chemical and physical.

Steel radiators

Now we will look at heating steel radiators. bimetallic or cast iron? Review + Video

Among their main advantages it is worth noting small weight and thickness. They are compact and have good heat dissipation. What is especially nice is the affordable price.

As a rule, these are tubular structures, integral or stacked from several sections. Steel heating radiators are perfect for autonomous heating systems.

But for apartments with a centralized system, they are not suitable, since they do not withstand pressure more than 8-16 atmospheres, depending on the model, and water hammer is fatal for them. Among the drawbacks , there are also: a tendency to corrosion when draining water and a poor reaction to oxygen entering the system through pipes.

bimetallic or cast iron? Review + Video Aluminum heating radiators are more susceptible to corrosion than others and are not resistant to water hammer.

They look great, fit perfectly into any interior and emit a lot of heat - up to 190 watts, which is an undoubted advantage of these devices.

Aluminum radiators can also be suitable for a private house, but absolutely not suitable for apartments with a central heating system, because in addition to instability to water hammer, due to the high activity of aluminum, water with a high acid content can quickly destroy the radiator.

Just like copper radiators, aluminum ones contain very little water, which greatly contributes to rapid heating, and allow the use of heat regulators. 50% of the heat from them comes from radiation, and the other 50% comes from convection.

Bimetallic radiators

Bimetallic radiators combine the advantages of steel and aluminum - after all, they are made of these materials.

bimetallic or cast iron? Review + Video They are: steel piping and aluminum ribs. In such radiators, one-piece pipes are used, welded together in such a way that water does not destroy the steel structure during circulation.

They are characterized by high thermal conductivity and high pressure resistance, strong and corrosion resistant.

The working pressure of this type of heating radiators starts from 20 atmospheres, and they serve up to 20 years!

bimetallic or cast iron? Review + Video Among the disadvantages is the price, which is 15-20% higher than for aluminum. In systems where these radiators are installed, increased energy efficiency is required to drive water.

Bimetallic heating radiators are perfect for apartment buildings and multi-storey office buildings, in a word, where increased reliability is required. Due to the need for high pressure, in private houses and apartments with an autonomous heating system, the installation of bimetallic radiators is not advisable.

Of course, there are some drawbacks. First, the high price; secondly, high sensitivity to oxygen concentration in water; third, the accumulation of slag on the inner surface of the walls; and fourthly, in bimetallic structures, resistance is formed at the joints of two metals, which reduces the level of heat transfer.

Cast iron radiators

And finally, cast iron! Yes, cast iron.

How many years have passed, but the world has not changed - cast iron heating radiators are still one of the most reliable models on the heating system market. There will be no surprise from such devices in case of water hammer, and besides, cast iron is chemically passive, that is, no alkalis are afraid of it.

bimetallic or cast iron? Review + Video Cast iron radiators hold heat twice as long as other samples. In such radiators, the method of heat transfer is radial, which is much more efficient than convection. Cast iron batteries do not rust when drained, which seems to be a huge plus.

The working pressure of "cast iron" reaches 12 atmospheres, which makes such radiators resistant to pressure fluctuations in communications.

The truth among the minuses is a lot of weight. Carrying and installing heating radiators will be very cumbersome, therefore, this business will have to be entrusted to professionals - plumbers. But their weight is an inevitable consequence of the thickness and strength of the walls, so something will have to be sacrificed. And durability is much more important than easy transportation.

Those who do not like the miserable "Sovdepovskiy" look of cast-iron radiators have nothing to fear - in the modern assortment you can find highly artistic options painted in brass, silver, etc., which can be supplemented by anyone, even the most whimsical interior.

True, such products will cost more. From manufacturers, you can advise, for example, Roca and Konner.

Which of the radiators to choose from

So, let's summarize.

Still, cast-iron heating radiators are still the best option for the centralized heating network of apartment buildings. They are resistant to pressure drops, reduced water quality and have the longest service life. However, you cannot put a heat regulator on "cast iron".

bimetallic or cast iron? Review + Video A bimetallic battery can serve as a good option for replacing such systems. Steel and a special joining method are highly resistant to corrosion.

In addition, bimetallic radiators are resistant to water hammer and the harmful chemical composition of our water.

A copper radiator can serve as a tolerable substitute for cast iron. Copper is ductile, not corrosive, and besides, over time, the inner walls are covered with a protective oxide layer, which will increase the service life of the device.

For autonomous heating systems, aluminum heating radiators are more suitable, since in private houses the risk of pressure drops is much lower. Affordable price, design, high heat transfer - all this speaks for itself.

The ability to install heat regulators.

bimetallic or cast iron? Review + Video Steel radiators are an alternative. They have less heat transfer, but the price and weight are lower, reduced inertia and the design is pleasing to the eye.

And finally, it should be noted that when choosing heating radiators, you need to calculate the correct number of links and heat output. It all depends on several parameters: the size of the room, the number of external walls and windows, types of houses (brick, panel) and windows (plastic, wood).

The calculation of the required heat output is made from a standard height of ceilings up to 3 meters and windows 1.5x1.8 m. Usually, to facilitate calculations, 1 radiator section is taken for 1.5-2m 2 .


Power (W per m 2 ) 1 outer wall (W) 2 outer walls ( W)
1 window 100 120
2 windows 120 130
Windows facing north + 10% + 10%
Deep open niche + 5% + 5%
Solid panel device + 15% +15%

All radiators have different thermal power (W per section):

Aluminum radiator - 190

Cast iron - 80-150

Steel - 450-5700

Bimetallic - 200

Copper - 239

This data can be found in the specifications provided by the manufacturer.