
Heat only 2 wire boiler installations for Ecobi thermostatsThis article applies to ecobi3, ecobee3 lite and ecobee4https : //support.ecobee.com/hc/en-us/articles/227874667-Heat-only-2-wire-boiler-ofen-installationsEcobee thermostats require wire C (common) to power up. You only have two wires on your current thermostat, multiple installation options are available depending on your application.

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