“How many wires do I need to run just the heat side? I have radiant in floor heat with three wires only two are being used with my battery powered thermostat.”
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Hi RonB, thank you for your question. You have to use the same wires that you are using on your current thermostat. We will be happy to help verifying compatibility and providing recommendations for a C wire depending on your system type and amount of wires. Feel free to contact our tech support team at (800) 633-3991 or send us a Private Message to our Honeywell Home Facebook account. - Maria
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