Cast iron batteries
Such a device will stand without any damage for 30-50 years, it keeps the temperature for a long time, thanks to its large weight( about 8 kg), and it is excellent for heating the rooms when the water in the system is not very hot( up to 50 degrees).Heat the air from which the surrounding objects are heated( 90% of the heat).But they are heavy and ugly. 
Convectors
These heaters, on the other hand, work more efficiently at the maximum temperature of the coolant due to the principle of operation: the air heated between the radiator elements should quickly rise up, giving way to the cold one, and if the hot water in the system is insufficient, the movement will be slow. 
Aluminum batteries
The new word in heating systems - aluminum radiators for heating - combines the advantages of the two listed options. Due to the low weight of such radiators are best suited for controlled independent heating( the air temperature in the room is quickly regulated).Plus, aluminum has a high heat dissipation. However, quickly deteriorate due to corrosion, eating soft metal.
Bimetal radiators
Bimetallic batteries are not for nothing that quickly conquer the market. They have durability almost like cast iron radiators, heat transfer, like aluminum, plus they look very nice and easy to install. 
How to choose a radiator in a private house or apartment?
You can contact the forum and read the reviews before choosing. However, a few tips from experts will help you to understand the issue yourself:
- If you are replacing an old cast-iron battery with a new one, there are few options: the same, but new or bimetallic( others simply can not cope with bad water quality in the system.when the heating devices are changed by all the tenants of the apartment building without exception or the replacement is made with independent heating
- If the coolant in the system is not hot enough - choose cast-iron batteries, they will copeI with heating the room and in such conditions For hot water systems it is better to give preference to bimetallic ones - not much more expensive but aesthetically and effectively
- If the dwelling is equipped with convectors that are planned to be replaced, then the water quality is relatively normal and can be purchased for replacementaluminum heating radiators
- If the main priority is durability, then choose either convectors or traditional cast iron radiators. New types of heating devices do not reach them.
