Hello, can you please add relevant info to your post, it shouldn’t be a jigsaw puzzle 
- Which Homey model
- How is your heating system built?
2a.why you need Shelly when you’ve a tado bridge?
2b. you mentioned “the group”… group of what exactly?
2c. which app do you use for that group?
2d. which devices are member of the group? - While you mention “tado bridge”: Which tado app (there are two of them) you use?
- Add a corresponding flow (screenshot) pls
First thought: why didn’t you restart the tado app
Hints:
