“what is the power source of this item battery or 110 volt?”

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• There are no batteries. Thermostat is powered by 24 volts from the furnace.

  Answered by Duck 5 years ago

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• There is no battery in the unit, it draws it's power from the thermostat Rc or Rh wire coming from your HVAC units control board. You also need a 24 common wire. If you don't have a common, the unit comes with a common wire adapter to work in lieu of a dedicated common wire.

  Answered by Tank 5 years ago

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• Great question! All ecobee smart thermostats require a C wire or use of the included Power Extender Kit (PEK) to ensure constant power.

  Answered by ecobee 5 years ago

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