Hi @wbhartmanii, good evening. This feature is both a software and hardware limitation. In theory the Iro could run more than one zone at a time (up to a certain electrical capacity) however, we found many users mistakenly scheduled more than one zone to run at the same time on accident on their old dumb timers.
Could you tell us more about how you would combine 2 or more zone together? It would be great to better understand your use case.
@plainsane, just to confirm, you’re looking for this feature due to the pressure output of the pump?
Thanks for sharing!