As far as I can tell, the systems are all maufactured in Germany and / or Italy. I cold not find any information pertaining to a Truma manufacturing facility in the USA.
This, if true, certainly could account for some of the lack of availability of components with which to repair the defective heaters.
Developed in Germany, produced in Italy: Our Products come from a single mold
One of our most important success factors: Within the Truma Group, development and production come from a single source. This means we can optimally coordinate manufacturing and production. The development headquarter is part of our German parent company, located in Putzbrunn, Bavaria. Together, we set new standards with coordinated, continuous improvements in development and manufacturing. This enables us to manufacture high-performance, high-precision products that delight our customers and add the greatest possible value.