“I want to install Honeywell RTH6580 thermostat to a 2 wire heat only system. Send instructions please”
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The RTH6580WFWI-FI THERMOSTAT will not work with only two wires, it needs a 24 volt power source to operate. That is normally supplied from the furnace with a common wire this means you will need at least 3 wires from the furnace to the thermostat to operate a heat only system.
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