Nest 2 Wire diagram for Heat insert

[Vince33]

Can someone look at my 2-wire pic for my insert heater and let me know if the Nest Thermostat will support it without a C wire?

[Houptee]

Where is the pic?

Is this a fireplace insert?

If yes they are usually millivolt systems that don't have a 24v transformer.

The only way to get it to work is with a plug in 24v ac wall transformer connected to R and C.

[Vince33]

the wiring pic was in subsequent post.

yes, it is a gas fireplace insert (15yrs old or so)

[Jeff]

Hi Vince33,

I just wanted to jump in real fast to see if you saw Houptee's replies and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.

Thanks,
Jeff

[AbigailF]

Hey Vince33,

We’d like to check in again in case you have any further questions or concerns. Feel free to reply to this thread and we’ll help you out.

Best, 
Abi

[AbigailF]

Hello Vince33,

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 have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Regards, 
Abi

[Houptee]

You need one of these. https://www.amazon.com/dp/B085TLYBFX

You put one transformer wire into C

The other transformer wire together in the same terminal with the R wire on the Nest.

Then put your W wire in W.

This will provide constant 24V AC to keep Nest powered up and charged.

[Houptee]

It will be similar to this video see how he wires the transformer to the Nest

https://youtu.be/yi5kfn3bmEk