Ecobee Power Extender Kit

The Ecobee Power Extender Kit (model EB-PEK2-01) is a cost-effective adapter that brings smart thermostat technology to homes without a common wire. If your HVAC system lacks the C-wire that most modern thermostats need for continuous power, this kit installs at your furnace or air handler control board to supply that power. It's the difference between replacing your thermostat wiring throughout the walls and installing one simple device at the furnace. This kit makes any home an Ecobee Smart Thermostat home.

• Furnace Control Board Installation: The Power Extender Kit installs directly at the control board of your furnace or air handler, not at the wall thermostat. This means no wall demolition, no fishing wires through finished spaces, and no electrician call for whole-house rewiring.

• Broad Ecobee Compatibility: This kit works with the full Ecobee Smart Thermostat lineup, including the Smart Thermostat Essential and Smart Thermostat Lite models. One accessory solves the C-wire problem across multiple thermostat generations.

• 24 VAC System Support: Designed for most 24 VAC HVAC systems, the same voltage standard used in residential heating and cooling across North America. If your existing thermostat runs on 24 volts, this kit will likely work with your system.

• Dual Fuel and Humidity Control Capability: The kit supports dual fuel systems (heat pump with backup furnace) and humidity control features. You're not sacrificing advanced HVAC functions to gain smart thermostat compatibility.

• WiFi-Enabled Thermostat Support: Once installed, the Power Extender Kit powers WiFi-connected Ecobee thermostats so they can maintain continuous cloud connectivity, push software updates, and respond to remote commands without battery drain.

• Compact 1/2" Profile: The physical footprint stays small inside your furnace cabinet, leaving room for other components and service access.

The Power Extender Kit is compatible with most 24 VAC residential HVAC systems. It is not compatible with dual transformer systems, fan coil units, or communicating HVAC systems (those using proprietary control protocols between components). Installation requires access to your furnace or air handler control board. The kit is designed for use with Ecobee Smart Thermostats, including models that do not ship with the Power Extender Kit included in the box, such as the Smart Thermostat Essential and Smart Thermostat Lite.

The kit contains the Power Extender Kit module and the necessary wiring to connect it to your furnace control board and extend power back to your Ecobee thermostat at the wall.

A: The Power Extender Kit supplies continuous power to your Ecobee Smart Thermostat when your home lacks a C-wire (common wire) in the existing thermostat wiring. Without a C-wire, smart thermostats can't maintain WiFi connectivity, run the color display, or process software updates reliably. This kit solves that by tapping into power at the furnace control board and delivering it through your existing thermostat wires.

A: The Power Extender Kit installs at the control board inside your furnace or air handler, not at the wall where the thermostat hangs. You'll open the furnace cabinet, locate the low-voltage terminal block where your thermostat wires connect, and wire the Power Extender Kit inline at that location. This keeps all the power conversion work centralized at the equipment, so your wall installation stays simple.