What thermostats will work for millivolt controlled gas fireplace log?
Battery powered and or 24 vac powered?
Where can I purchase one?
I would recommend the CT50. It will work with milivolt systems. It has WiFi capability but will need 24vac power to run the WiFi. If not going to run WiFi then don’t need the 24 volt supply it can run on batteries.
They are available at Amazon or at http://store.radiothermostat.com/main.sc