Shell-and-tube heaters intended for organization of heating systems through heat exchange between the two environments, “water-water” or “vapor-water”. This heaters are widely used in industrial and administrative buildings. The principle of operation of these devices is fairly simple, it involves transferring heat from hot fluid to the cold environment. Shell-and-tube heat exchangers from Concern Medved are a highly efficient and reliable equipment that have a high resistance to water hammer and not in need of a clean environment. Such a device will work stably practically in any conditions.