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Hello, I have and have been using SENSI by Emerson, this is a excellent choice for your needs.
To power that t-stat, you will require 24 volt common to terminal C and 24volt + to R terminal of t-stat
The power comes from your Reznor unit, same t-stat wires you are using now. but will need one more wire for 24 com required for any WIFI t-stat
Here is a link of the units wiring diagram. refer page 18 look at the top of board for transformer wiring, use the COM for 24volt com.
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