These boilers are now very widely used for heating. Its name was from the device similarity to the radiator, because going from individual sections, made of cast iron. Thus, this design allows you to not only quickly put together a cauldron at the place of installation, but if you want to perform in a short time of its dismantlement.
Block system sectioned boiler allows to increase its capacity up to the required value by attaching a new cast iron sections. The disadvantage of this design is that you need to replace one of the internal sections, inoperative, for example, due to the formation of cracks in it, will have to completely disassemble the entire structure of the boiler.