Hello Scott! The current generation of Eve Water Guard is not ready for Thread. We will be releasing new hardware generations of many Eve devices with Thread support later this year, but unfortunately can't give any further details on when this will be the case for Eve Water Guard at this time.
Here's a list of all the currently available Thread-enabled Eve accessories:
https://www.evehome.com/de/identify-your-eve-accessory
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Apr 28, 2021