Would the Vista panel be compatible with the ADC smart water valve?
The System Enhancement Module has the Z-Wave radio installed and would work with the water valve.
Steps on how to add/remove Z-Wave devices from the SEM can be found here:
The SEM lacks the ability to run a Z-Wave Network Rediscovery locally. This should be run any time you add all Z-Wave devices, or remove a Z-Wave device, from the network. Thie feature maps out the best communication pathways for the network. Z-Wave Network Rediscoveries would be run remotely.
Alarm systems like the Qolsys IQ Panel 4 are easier to work with from a DIY aspect over the Vista/SEM, espeically when it comes to Z-Wave.