Sonoff TRVZB questions

Hardware
1

A few questions about this device:

  1. Does the faucet also close partially, or does it always open and close completely to regulate the temperature?
  2. Can it also be used offline? That is, if I set a temperature on the valve, say 20 degrees, does it work even without a ZigBee hub?
  3. Can I calibrate the temperature, for example, if the valve indicates 2 degrees higher than the room temperature?

thanks

2
  1. It just completely opens or closes (at least mine does)
  2. yes. If you use internal temperature sensor zb connection is only for monitoring and eventual settings from remote device (HA…). Even if you use external sensor valve will automatically switch to internal if no external data is received for 2 hours
  3. Yes, it does have an option for calibrating temperature. In fact, “better thermostat” addon uses this for regulation.