ecobee thermostats require a C (popular) wire to energy on find a bride. When your current thermoregulator makes use of just two cables (R and W, or T and T), you will find a few installation choices available, according to the application.
Prior to starting out, take note the annotated following:
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You won’t manage to install the Power Extender Kit (PEK) with heat-only 2-wire systems.