Review on Transformer Thermostat Competible Versions Honeywell by Tony Dago

Use this information at your own risk. I take no responsibility for your decisions and actions. I got my unpowered millivolt oven to work with FastStat. There was absolutely no information about this on the internet. Shown from top to bottom: THTP (not used) TP/THI used Fast-Stat to hook up a millivolt oven system that used a thermopile and had only 2 wires coming out of it. Wall-to-Thermostat with Nest 3rd Gen. I was able to install a 3rd gen Nest by adding a 24VAC transformer. A wire from the transformer went straight to the red wire (Rh) that went to the thermostat and the red wire from Faststat went to the old red wire that connected to TP/TH. The black wire of the FS block wire was connected to another wire of the transformer. The purple wire went to another existing wire to the thermostat (W). White FastStat, moved to TH. Red moved from FastStat to TP/TH. The remote unit now has 3 wires. White goes to W. Black goes to C. Red goes to Rh. My 3rd gen nest runs my propane stove. Much luck.