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I was able to get the Opentherm, Nest and DHW priority to work once I also installed the VR66, which effectively eliminated the S plan system. I have written about all the steps here: https://www.plumbersforums.net/threads/vaillant-ecotec-system-boiler-with-vr66-and-opentherm-nest.131275/

I managed to get Nest to communicate with my Ecotec Plus 624 system boiler via the VR33 (with modulation) and work for the CH. The wiring was as in the manual, I basically just needed to wire in the OT contacts, plug in the VR33 at X31, bridge the RT24 contacts and remove the RT240 (live) from...