Wiring from old Honeywell thermostat

[Jolson]

Have a two wire Honeywell thermostat replacing with Nest Learning thermostat. Only boiler, so two wires out of Honeywell run boiler. no a/c or other items.I have the two wires being used and two additional wires available at the thermostat which were not used by the Honeywell. I assume I can run the Nest with 4 wires. How many wires do I need and where do they connect on Nest?

[Markjosephp]

Hello Jolson,

Thank you for taking the time to let us know about your inquiry. I'd be happy to take a look into this for you.

A 2-wire configuration would also work with the Nest Thermostats, but you might need additional power by installing a C wire or Nest Power Connector. Let's see if we can use the other two bare wires as a common wire. Could you send us a picture of your boiler's control panel showing the wiring configuration from your thermostat?

I'll look forward to your response.

Best regards,

Mark

[Markjosephp]

Hello there,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Thanks,

Mark

[Markjosephp]

Hi Jolson,

I'm just checking in to make sure that you've seen my response. Please let us know if you have any additional questions or concerns before I close this thread in 24 hours.

Best regards,

Mark