What are the power requirements and options for the TH8320U1008 thermostat?
The TH8320U can be powered by either batteries or a common wire (24 Vac). The thermostat is designed to provide electronic control of 24 Vac heating and cooling systems or 750 mV heating systems.
From the official Honeywell Th8320U1008 Thermostat manual, page 1
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