@jlv
I have a Rheem water heater and their WiFi module.
My understanding (which may be about to change) is that it’s only the WiFi module that is powered by the electrical connection, and if it, for whatever reason, loses power, the water heater itself (which worked just fine without electricity before I installed the WiFi module) will still keep working.
Am I wrong?
I really want to know. So, I guess I better double-check to make sure I’m not remembering things incorrectly…