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Originally Posted by BroadHopper
I have the old round Honeywell thermostat. I finally bite the bullet and bought a wireless thermostat. Home Depot had a one day sale for $149 (online). There is a form you fill out the receive $100 credit from the state. So I can swallow that.
A call to Nest support and they did a fantastic job of answering all questions so I should be good to go! You can use two wires instead of three and the span is .5 instead of one. My boiler request for a .1 span (Rinnai). They will be glad to remotely program the Nest to .1.
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I thought that the third wire, the C wire, was to give constant power to the Nest so that it charges it's battery all the time versus just when the heat is running with only 2 wires.