Does this product need to be plugged into an AC outlet ?

No, it has to be wired into the furnace!

Will this work with a 3 wire heat only forced air system?? My system only has red,white & green wires...Or can I just use the green wire as a common.

Hi Rcq78, this C wire adapter requires 4 wires. If you have only 3 wires we recommend contacting your HVAC contractor to help you run a new wire from the C on your heating system to C on the thermostat. - Maria

Will this product work with a 2 wire system?

Hi Marcella, thanks for contacting us. Since your system has 2 wires only, we recommend checking on the furnace motherboard to see if there is a C terminal and run a new wire from that C to the thermostat on C. The other option will be to Install a second transformer that provides 24Volts. The adapter won't be compatible. Please, feel free to reach us at 1-855-733-5465. We'd be glad to assist you with further information. Thank you.

Can this me used in a dual application with 2 of the same thermostat’s. First floor and second floor?

No, a Honeywell Home CWIREADPTR C-Wire Power Adapter will be required for each thermostat. -Jerry

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C-Wire Adapter

Product ID: 165172708

Details

Brand
Honeywell
Color
White
Compatible Devices
Thermostats
Connector Type
Barrel
Included Components
C-wire adapter
Input Voltage
24 volts

⚡24V continuous power output

📏Compact, adhesive mount design

🔧Easy push terminal installation

S$129

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Description

⚡ Power your smart home effortlessly—no C-wire? No problem!

FUTURE PROOF YOUR HVAC - Supports multi-stage systems and heat pumps, so your smart thermostat stays ahead of your home's needs.
EFFORTLESS INSTALLATION - Push terminals and adhesive mount make setup quick and tool-free—get connected in minutes, no electrician needed.
SLEEK DISCREET DESIGN - Modern white enclosure with a closed cover keeps your installation site clean and professional-looking.
UNIVERSAL COMPATIBILITY - Works with most forced air, hot water, steam, and heat pump systems—except electric baseboard heat.
POWER UP YOUR SMART THERMOSTAT - Delivers steady 24V power to Wi-Fi thermostats missing a C-wire, ensuring seamless smart home integration.

The Honeywell Home CWIREADPTR C-Wire Power Adapter provides a reliable 24V power source for Wi-Fi thermostats lacking a common wire. Featuring easy push terminals and an adhesive mount, it enables quick, clean installation compatible with most HVAC systems except electric baseboard heat. Its sleek design conceals wiring for a professional finish, making it the perfect upgrade for modern smart homes.

Specifications

ASIN	B07VMV2BJ7
Best Sellers Rank	#727,020 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #582 in Home Thermostat Accessories
Brand	Honeywell
Built-In Media	C-wire adapter
Color	White
Compatible Devices	Thermostats
Connectivity Technology	Wi Fi
Connector Type	Barrel Connector
Current	DC
Customer Package Type	Standard Packaging
Customer Reviews	4.2 4.2 out of 5 stars (1,316)
Enclosure Material	Plastic
Form Factor	compact and flat design with a barrel connector and wires
Global Trade Identification Number	00085267419789
Input Voltage	24 volts
Item Type Name	C-Wire Power Adapter
Item Weight	5.92 ounces
Main Power Connector Type	2 Pin
Manufacturer	Honeywell Home
Mfr Part Number	CWIREADPTR4001
Model Name	Honeywell Home C-Wire Power Adapter
Model Number	CWIREADPTR4001
Mounting Type	adhesive mount
Number of Items	1
Output Current	15 A
Output Voltage	24 volts
Power Plug	No Plug
Power Source	Corded Electric
UPC	085267419789
Unit Count	1 count
Warranty Description	1 Year Limited
Wattage	24 watts

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S$129

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to SINGAPORE.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Good experience, but the tracking updates could be better.

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