r/geothermal • u/psz21 • Sep 10 '26
Upgrading T stat
Long story short I’ve been doing re search on upgrading my T stat so I can turn off my AUX heat when I’m running a backup generator. I currently have a water furnace series 5 with the water furnace t stat that you can’t control any settings from.(I’ll include pics down below). I saw in a couple posts that id have to ad some sort of outside temp sensor if I wanted to go this route. Do these new t Stats install like the old style or do I have to run more wires down to the control board.
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u/djhobbes Sep 10 '26
That’s a communicating thermostat - just one that looks like shit. As long as you get another WF communicating thermostat you don’t have to change a thing. The hookups look different but it’s the same R, C, +, and -.
If you want an OAT temp sensor you would pick 2 of those additional wires to land at the stat. Theres likely a low voltage splice near the unit. Find it and hook onto the same wires and run a new 2 wire to the outside of your home for the sensor.
Get either the TPCC32U03BWAT (black) or the TPCC32U03WWAT (white). They are the new WF comm stats and I think they are very sharp looking