NOT KNOWN FACTS ABOUT COPYRIGHT SIDE EFFECTS

The current Ecobee install utilizes the PEK since I think you can find only 4 or 5 wires going from your thermostat to the furnace but I can quite easily incorporate far more wires if necessary to get two phases (thermostat is almost straight over the furnace which can be inside the unfinished basement). I'd also be interested in your Ecobee config