I have been able to connect my Leviton 73A00-3ZB Load Control Module to my ST Hub with the help of FalcoGeorge who wrote the device driver. This LCM enables me to turn my electric Hot Water Heater on and off. I engaged a SmartApp to do that on a schedule. I replaced a digital GE Time Switch (15132) with this LCM so I could control the power remotely. If I were to do this again, I am not sure I would because this exercise cost me about $600. (LCM-$200; Hub-$100; Installation by contractor-$325, including required rewiring)
The LCM needs to be paired after the installation of the device driver. The driver written by FalcoGeorge works “right out of the box” and no mods were required. The SmartApp I used was in Lights and Switches.
I am Happy, Happy, Happy!