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No C wire, no visible way to use an adapter-- can I use a Nest with my old boiler?

amhz
Community Member

I have a two-wire heating system running my gas boiler and radiators. I bought a 2020 Nest, and quickly found out it doesn't work without C wires (which my system doesn't have). I purchased the Nest Power Connector, and then began looking for the wire terminals on my boiler, which were nowhere to be found. I finally figured out that they are in a box on the ceiling. It's a rat-nest of unlabeled wires, although I think I can figure out which two are connected to my thermostat based on the colors. My next realization: I cannot find a single electrical outlet near this ceiling box.  I'd have to pay to put in a new outlet to use the adapter which I'm not even sure will work with my system. I'm attaching pictures of the wire box. Appreciate any advice.

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4 REPLIES 4

amhz
Community Member

I'll add another question: will the 3rd Generation Nest Thermostat work without a C-wire long term, or will we be dealing with batteries constantly running out?

Jhonleanmel
Community Specialist
Community Specialist

Hi amhz,

 

Thanks for posting and sorry for the delay. I'd love to know more about this. Could you share a photo of your current thermostat's wiring showing the labels for the wires?

 

Best,

Mel

Dan_A
Community Specialist
Community Specialist

Hey there,

 

I wanted to follow up and see if you still need help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

 

Best,

Dan

Dan_A
Community Specialist
Community Specialist

Hi amhz,

 

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.

 

Thanks

Dan