I have a water flow switch that is NO (normally open) during water flow and NC (normally closed) when there is no water flow. Is there a device (Insteon, Z-Wave, or whatever)  that integrates with my ISY that can be wired to this contact closure to signal On or OFF... so I can then write a program that emails me any change in status. Any recommendations would be appreciated.

Don't know about Insteon but a Mimo device would work for ZWave.  Best of luck.

32 minutes ago, Bspect said:

I have a water flow switch that is NO (normally open) during water flow and NC (normally closed) when there is no water flow. Is there a device (Insteon, Z-Wave, or whatever)  that integrates with my ISY that can be wired to this contact closure to signal On or OFF... so I can then write a program that emails me any change in status. Any recommendations would be appreciated.

https://www.smarthome.com/collections/insteon-other-devices/products/i-o-linc-insteon-2450-low-voltage-contact-closure-interface-1-in-1-out

https://www.smarthome.com/collections/insteon-security/products/insteon-2843-222-wireless-open-close-sensor

The 2450 I/OLinc can have its Sensor and Ground terminals wired to your switch. It is an earlier design so it is power line only communications.

The 2843-222 has a terminal block in it. Where you can wire your switch. It is in parallel with the internal magnetic switch. So when used with the external input. The magnet is not used. It is Insteon RF only and powered by a battery.