I found this YouTube video to be rather helpful. But it did not cover the entire process. Especially what to use when you do not have a 24AC transformer available.
There are numerous ways to get this C wire. The C wire is merely 24 Volts AC. Nothing magical here. If you can find a transformer somewhere like in many of the videos, you've obviously been to an HVAC supplier in the area. If you really want to install your shiny new WiFi, app driven Thermostat that has been sitting on the kitchen counter for over a week... at 7PM... on Saturday, the only truly free time in the whole damn week, you, are NOT screwed.
Lowe's sold me this for $15 bucks...
That is a doorbell transformer. The bottom two post screws have what you need, C and RC. Yes! The C wire also needs an RC wire. So, it's two wires.
My Boiler had only two wires, I needed four wires, so I bought new 7-wire wire from Lowe's in case future Thermostats require more wires than current day and I replaced the wire from the boiler to the thermostat.
Anyway, my 2 wires that existed were both labeled T T. No W, No G, No Yellow, None of that. These TT wires in my system were Black and White. They measured 24 volts. They could not be used as a C wire. Using a jumper and connecting one of the wires to the C will not work.
The moment we've all been waiting for... I had to connect one of my existing wires(White in my case) to W and the other wire(black in my case) to R. Then I had to connect the wires from the bottom 2 posts on that transformer. One went to C and the other one to RC. That's it. It was frankly very easy to do.
I found a place to mount that little doorbell transformer on the boiler and it looks totally stock.I wish someone would have made this a bit easier to get to this information, so I wrote this blog post. I hope it helps.
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