What hardware - existing heatpump with floor heating - what hardware for multizone heating?

Hey all,

I’ve got a Hitachi Yutaki heatpump for my floor heating (and cooling).
We’ve got two manifolds with 7 and 9 groups. Currently we are using quite a bit of energy to heat the entire house. And I would like to get in control of the heating per room/zone.

Now, I’ve got a few questions about this.

  1. What hardware would I need to control each zone?
  2. What brand/system would you recommend? I would prefer something with a local API, that keeps the data local.
  3. How does this work in combination with the heatpump and buffer? How do they communicate. Would it just send a dumb on/off request? Would the system turn on for just one small room, or would it combine multiple temperature requests before running?
  4. I would prefer a room sensor that goes in a 230v system 55 wall mounting.