Best C Wire Adapter In June 2025

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Here you have our curated list of Best C Wire Adapter. Each of them comes with different price, style, and design, so you have plenty of options to choose from. Keep reading for our top products review!

To help you in your search, we have completed this list of the Best C Wire Adapter.

Top Rated Best C Wire Adapter Of 2025

Rank	Product Name	Score
1	24 Volt Transformer, C Wire Adapter Thermostat, Competible with All Versions of Ring Buy Now	9.7 Buy Now
2	24 Volt Transformer, C Wire Adapter Thermostats, Compatible with Ecobee, Nest and Honeywell Buy Now	9.5 Buy Now
3	24V Thermostat Transformer,LANMU 24VAC C-Wire Transformer Power Adapter for Nest,Honeywell,Ecobee,Emerson Sensi WiFi Smart Buy Now	9.1 Buy Now
4	24 Volt Power Adapter/Transformer，C-Wire Adapter Thermostat，Compatible with Honeywell,Nest,Ecobee,and Sensi Smart WiFi Thermostat Pro Buy Now	8.8 Buy Now
5	Honeywell Home CWIREADPTR4001 C-Wire Power Adapter, White Buy Now	8.6 Buy Now
6	Venstar ACC0410 Add-A-Wire Accessory for All 24 VAC Thermostats (4 to 5 Wires) Buy Now	8.3 Buy Now
7	24 Volt Transformer, C Wire Adapter Thermostats, Compatible with Ecobee, Nest and Honeywell Buy Now	8.1 Buy Now
8	Fyve 24 Volt Transformer, C Wire Adapter, Compatible with Nest Honeywell Ecobee Sensi Buy Now	7.8 Buy Now
9	24V Thermostat Transformer,AC 24V C-Wire Power Supply Adapter for Honeywell Smart WiFi Thermostat,Nest Buy Now	7.5 Buy Now
10	24 Volt Transformer, C Wire Adapter for Nest Honeywell Ecobee and Sensi ThermostaDoorbell Buy Now	7.2 Buy Now

1. 24 Volt Transformer, C Wire Adapter Thermostat, Competible with All Versions of Ring

• Long cable:our cable is 8m(315 inch) long and you do not worry about the distance between the socket and the honeywell smart wifi thermostat. this allows you to easily plug it into an electrical outlet inside or outside your house.
• Customers:what you get- 1. high quality accessory 2. 180 days money-back 3 . professional customer service. viivria has a professional team which has been specialized in designing and manufacturing transformers for a few years, improving technologies to meet consumers' needs.
• Widely use: 1 eu power cable powers your popular smart thermostats((nest, ecobee, honeywell, sensi) and doorbells(ring video doorbell, ring video doorbell 2 & ring video doorbell pro,nest skybell , etc.) and other devices that require constant 24 volt power for operation, enables you to charge your devices safely.
• Safe and convenient :our battery backup has gotten the ul certificate. a quick fix to the problem of "low batter" you can charge it directly(plug adapter into outlet and power up). that means you don't need to remove your honeywell thermostat in order to charge up the battery.with an ac output of 24v/500ma, a perfect tool to meet your needs.
• Easy to use:assemble along the wall from your outlet to the doorbell and thermostat without the existing doorbell or wiring. easy installation and be able to set up in minutes.

2. 24 Volt Transformer, C Wire Adapter Thermostats, Compatible with Ecobee, Nest and Honeywell

• Ul certified: ul certification passed, stable and durable operation 24v transformer
• 24v c wire power adapter: plugs into your standard 110 v/120 v outlet and converts to 24 volt ac current
• 24 volt transformer for thermostat and doorbell: powers up smart thermostats for (nest, ecobee, honeywell, emerson sensi, hive, etc.) and doorbells (ring, nest hello, skybell, august) that require 24 volt power for operation
• Packing list: 1 x c wire adapter, 1 bag (50 pieces) of cable clips, note: please add a 50w watt 25 ohm resistor if you use this transformer to power a doorbell. the brand mentioned above is just for demonstrating compatibility
• Easy installation: 2 pin non-polarity wires support easy and quick install, 23 ft cable is long enough to plug it into an electrical outlet inside or outside your house

3. 24V Thermostat Transformer,LANMU 24VAC C-Wire Transformer Power Adapter for

• Connecting your honeywell smart wifi thermostat:powers your honeywell smart wifi thermostat,sprinkler systems and other devices that require constant ac24v power for operation.
• Easy to install:it's the most simple and convenient to install any pin to the "c" terminal and "rc" terminal (in furnace/boiler only wiring setups), plug adapter into outlet and power up.
• Home use: lanmu ac24v c-wire power adapter plugs into your standard 110v outlet and converts to 24vac current, power your equipment, perfectly compatible with nest learning thermostat, honeywell, emerson sensi,ecobee3, ecobee4 and other wi-fi smart thermostats that require constant 24 volt power for operation.
• Security and guarantee: lanmu ac24v c-wire power adapter is ul certified,can help honeywell smart wifi thermostat and other devices that require constant 24 volt power for operation. we offer 1 years warranty and satisfactory customer service, making sure the risk-free shopping for you.
• Long cable:our cable is 16.4 feet long and you don not worry about the distance between the socket and the honeywell smart wifi thermostat.

4. 24 Volt Power Adapter/Transformer，C-Wire Adapter Thermostat，Compatible with

• Easy installation :to prevent no power output, you must ensure that the terminals are stripped and securely clamp the screw terminals into the thermostat to maintain good contact2 pin non-polarity wires to ensure easy and error free installation for installers of all skill levels and knowledge basesif your wiring is complicated, please ask a professional electrician f...
• Home use: plug the transformer into your standard 110v /120v outlets and converts to 24 volt ac current.
• Extra long cable: 7.6m (25ft) long cable enables you to install the cable along the wall and connect to the electrical outlet inside or outside.
• Technical specifications: our battery backup input voltage is 120 v ac, 60 hz, output voltage is 24 v, 300ma/ac.
• Supported devices: the 24v power adapter can not only power for popular smart thermostats such as nest, honeywell, ecobee, hive, emerson sensi, but also can convert to 24 volt ac current for other devices that require 24v current for operation.

5. Honeywell Home CWIREADPTR4001 C-Wire Power Adapter, White

• Easy push terminals and an adhesive mount make installation quick and easy.
• Be discreet with a closed cover to conceal internal components and wires. the sleek, modern honeywell home exterior keeps the installation site clean and professional.
• Use for wi-fi, 24v honeywell home thermostats when a common wire is needed but not present.
• The c-wire power adapter makes honeywell home smart thermostats compatible with most homes that dont have a common wire.
• Simple adhesive mount allows you to attach the adapter to the outside of your furnace.
• Quickly and easily power connected thermostats that require a c-wire.

6. Venstar ACC0410 Add-A-Wire Accessory for All 24 VAC Thermostats (4 to 5 Wires)

• Great for installations with a broken common wire or retrofits.
• Allows 5 wire thermostats to use only 4 wires. also allows 5 wires to work like 6 wires.
• In applications where additional wiring cannot be run, the add-a-wire accessory can be used to add a wire to the thermostat. c-wire terminal is required
• Compatible with any 24vac thermostat signal wiring.
• Easy to install, easier than running new wire.

7. 24 Volt Transformer, C Wire Adapter Thermostats, Compatible with Ecobee, Nest and Honeywell

• 24 volt transformer for thermostat and doorbell: powers up smart thermostats for (nest, ecobee, honeywell, emerson sensi, hive, etc.) and doorbells (ring, nest hello, skybell, august) that require 24 volt power for operation
• Ul certified: ul certification passed, stable and durable operation 24v transformer
• Packing list: 1 x c wire adapter, 1 bag (50 pieces) of cable clips, note: please add a 50w watt 25 ohm resistor if you use this transformer to power a doorbell. the brand mentioned above is just for demonstrating compatibility
• Easy installation: 2 pin non-polarity wires support easy and quick install, 23 ft cable is long enough to plug it into an electrical outlet inside or outside your house
• 24v c wire power adapter: plugs into your standard 110 v/120 v outlet and converts to 24 volt ac current

8. Fyve 24 Volt Transformer, C Wire Adapter, Compatible with Nest Honeywell Ecobee Sensi

• Power smart devices: efficiently powers your smart wifi thermostats from popular makers such as honeywell, nest, ecobee, emerson sensi and serves as a doorbell transformer for ring doorbells, nest hello, skybell, etc. no more low or dead batteries
• Easy installation 2 pin non-polarity wires to ensure easy and error free installation for installers of all skill levels
• Standard home use: plug in transformer uses standard 110v outlet to convert to 24 volts of ac power
• Extra long cable 25 foot cable for added flexibility of long distance installation, easily hide behind baseboards and moldings.
• What's included 24 volt adapter and lifetime no hassle replacement warranty

9. 24V Thermostat Transformer,AC 24V C-Wire Power Supply Adapter for Honeywell Smart WiFi

• Home use:plug the transformer into your standard 110v outlets and converts to 24 volt ac current.
• Universal compatibility:this power adapter is compatible with thermostats which require 24v ac power supply such as nest,honeywell,ecobee,hive,emerson sensi and it also can convert to 24 volt ac current for other devices that require 24v current for operation.
• Easy to install:the ac power adapter is convenient to connect either pins to the "c" terminal and "rc" terminal of your smart thermostat.20ft power cable is long enough to connect to the electrical outlet along the wall.
• Ul certified:this 24v c-wire power transformer has gotten the ul certificate.input voltage is 120 v,ac,60 hz and output voltage is 24 v,0.3a/ac.
• What you get:1 * 24volt c-wire power transformer,180-day money back,lifetime warranty and friendly after-sale service.

10. 24 Volt Transformer, C Wire Adapter for Nest Honeywell Ecobee and Sensi ThermostaDoorbell

• Universal design - power your popular smart thermostats(nest, ecobee, honeywell, sensi) and doorbells(ring doorbells, nest hello doorbell, zmodo wifi smart doorbell etc.) and other devices that require constant 24 volt power for operation, enables you to charge your devices safely.
• Make home safer place - taichipanda doorbell transformer is ul listed and has built-in 2a thermal fuse short-circuit protection, which makes the home a safer place and you can use it without worries.
• Easy installation - assemble along the wall from your outlet to the doorbell and thermostat without the existing wiring. super easy to install that can be able to set up in minutes.
• To buyers - taichipanda has engaged in developing and manufacturing adapters for more than 10 years, the advanced production equipment and rigorous design ensure that each of our hardwired transformers is of the best quality. we promise 180-day money back and fast after-sale service.
• Convenient - with this c wire adapter, you could able to charge your doorbells and thermostats without any worry about interrupting, which makes it a wonderful ring doorbell transformer. you don't need to take off the battery inside the doorbells and just connect this transformer, keep doorbells charging any time you want.