I just received my Aqara W600 along with the W100. These are my observations (Zigbee config):
When two or more W600 are added inside a group, the W100 is useless for now. I cannot control a group of thermostats with the new W100 although it is set in Aqara App settings.
When adding the W100 as an external sensor to the W600, the connection is successful, but the connection fails again after some time and the temperature jumps back to the internal sensor. In settings the connection is still shown, but it is not working.
Hello @gafich10 , thank you for your help. I changed now to the suggested settings and it seems to work fine now. Also I´m now able to set the temperature for the group! Great help, thank you!