Can the TH8320U thermostat be used with a 750 mV heating system?
Yes, the TH8320U thermostat is compatible with 750 mV heating systems. This makes it suitable for use with millivolt heating systems such as certain gas fireplaces and floor furnaces. (Page 1)
From the official Honeywell Th8320U1008 Thermostat manual, page 1
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