In both cases the motors and electronics are made in Germany, the transformer for the 6000, 6100 and 6200 are from Slovenia. The transformers for the 6101 and 6201 are from China, they are actually made in Hong Kong. Every impeller magnet I know of is made in China, from your washing machine to Eheim to Tunze, I wouldn't be surprised if the same factory made them all and two brothers sell them from different companies. My understanding is the reason is two fold, ready access to magnetic ores mined in the area and it is a hazardous material that most western companies heavily restrict.