Awesome, now I have a proper reason to try CAN and drop the ISG!
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I also have a THZ 5.5 ECO (which is actually the same as the Stiebel Eltron LWZ 5 S TREND → Lüften, Heizen + externer WW-Speicher).
How do you know your IDs are different? And which ones exactly? My table matches canprogs/ElsterTable.inc at 5f7433533b7d16aeb6f70c020209f1ccf834d5a6 · andig/canprogs · GitHub pretty well, but also has some additional entries.