Is the TH8320U suitable for heat-only systems?
Yes, the TH8320U can be used in heat-only applications, including two-wire systems, power to open and close zone valves, normally open zone valves, warm air, hot water, high-efficiency furnaces, steam, and gravity systems. It is also suitable for heat-only systems with a fan.
From the official Honeywell T8320U Programmable Thermostat manual, page 1
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