AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315″ Long Cable
$14.44
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Price: $16.99 - $14.44
(as of Mar 28, 2025 12:52:14 UTC – Details)
Product Description
How to start this?
FOR THERMOSTATS
Shut off the circuit breaker power supplyInstall any wire from the 24 volt adapter to the “C” end and another wire to the “RC” end. If your system has a cooling system, you may need to use the included diode and connect the “RH” to the ‘RC’ terminal.Plug the power adapter into the socketOpen the circuit breaker power supplyInstall the panel on the thermostat
FOR DOORBELLS
Keep adapter unpluggedInstall wires from 24 volt adapter into the terminals for your doorbell unit (any wire can be connected to any terminal)Plug adapter into outletPut doorbell face plate on housing unitPower up and verify your doorbell is receiving necessary power using the accompanying application
Wild Using
This is a device that you can keep your machine continuously charging your doorbells or thermostats. Many old homes or apartments do not have a “C” wire to their current thermostat, and newer devices require a C-wire to power the device.This simple product allows you to make the problems
Compatible with: Ring Video Doorbell Ring Video Doorbell 2 Skybell Doorbell Honeywell Smart Wifi Thermostat Ecobee Thermostat Sensi Thermostat Google Nest Thermostat 1st/2nd
AC 24 Volt Transformer
Competible with All Versions of Ring Doorbell and Thermostat for Ecobee, Sensi and Honeywell
Note: Competible with Google Nest Thermostat 1st/2nd，Not for 3rd.
Continuously Charging
It can be continuously charging your device without the worry of take of the doorbells or thermostats. Which is time saving and work saving.
Package Included
1 x Adapter 24v transformer for thermostat 1 x 315 inch long cable (800 cm)
Long Cable
315 inch long cable (800 cm) allows you to wire it anywhere you want.
Specification:
Inner size: 5x 6.3 cm Box size: 10 x 5.5 x 8 cm Input: 120V AC 60Hz 0.2A Output: 24V AC 500mA Cable length: 800 cm ( 315 inch) Wire Type: Stranded copper wire
WIDELY USE: US power cable Powers your popular smart thermostats((Nest 1st/2nd, 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 AC 24 volt power for operation, enables you to charge your devices safely.
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.
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.
SAFE AND CONVENIENT :Our battery backup has gotten 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.
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 years, improving technologies to meet consumers’ needs.
13 reviews for AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315″ Long Cable
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$14.44
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Works for Nest 3rd gen
A top rated review said this doesn’t work for a nest gen 3. That’s not true, his wiring was likely faulty.The job of this device is to convert line voltage to 24v. That is it. A “C” wire is just 24v. This device is a C wire. At no point could it have done anything other than turned on / charged his thermostat.Works great. Plugs right in, easy to use.
Ben Climer –
Made Installing a Smart Doorbell Easy
This plug-in doorbell transformer was exactly what I needed to install a smart doorbell at my grandpa’s house, which didn’t have existing doorbell wiring. Setup was simple—just plug it in and connect the wires to the doorbell. It’s been working great with no issues, providing consistent power without any buzzing or overheating. If you need a hassle-free way to retrofit a smart doorbell in a home without wiring, this is a solid solution.
Fred W –
C-wire mod for smart thermostat
This transformer works perfectly to provide c-wire voltage (24 VAC) to an Emerson Sensi Smart, wifi thermostat, on a two wire, heat only heating system. Simply connect the two wires between the R (or Rh or Rc) and C terminals and it will provide the operating voltage to the thermostat, independent of the 24 VAC the stat uses to call for heat. Running off the thermostat batteries worked, but if the thermostat calls for heat often, they will go dead every month, and then the thermostat stops working, just when you need it most. Bought a second transformer for my second zone running the same thermostat model.
Mickeysoft –
Much easier to get the Amazon Thermostat to work without a C wire
I took a star off because while the instruction may not be wrong but did not work for me. Here is how I get my Amazon Thermostat to work. Here are some facts first-1. The HVAC does have a C wire but could not power the Amazon Thermostat, it appears that my HVAC C wire has 24 volts but not enough current (amps) to power the Thermostat. Hence need to add the transformer.2. I live in Florida, so the heating and the AC are in one unit, that means the R(H) and RC are jumped together with only 1 Red wire.3. I can’t say for other areas but in South Florida this way will work.4. When I followed the transformer instruction and mirror to the Amazon Thermostat, push the right button to connect one transformer wire to RH and the other wire to C and the Red wire from HVAC to R. I only get heat and not AC.5. To correct the issue and viewed at least DIY videos and learn to fix it. You need to merge the Red wire and one of the transformer power wire to a new leg that can insert into the R with the bottom right blue clip pushed up to allow the R and RC jumper to connect internally.Once that was done, everything work correctly. I have have heat and AC. The reason that I had only heat but not AC, because the R in the Amazon Thermostat is for “HEAT” and since you push the right blue clipper down, it disconnect the R and RC. There for there is no power sent to the AC unit.Since the the Amazon Thermostat cannot easily jump the connectors, then you must introduce a 3rd wire for the R connection with transformer power wire, Red from HVAC, bundle all three wire together.Hope this help you to install without a C wire or low amperage C wire. I have to say the Thermostat works great. Good luck.
Brian J. Penney –
Great Product and Easy to Use!
Worked out great, ordered to use it to power my Nest thermostat for garage heater. Easy to install and works without issues.
Ranger94 –
Worked great for my Ring doorbells.
Nice to not have to recharge the Ring batteries. Used to have to once a month. Now, they are powered all the time and I don’t worry about recharging.
Ryan Norton –
Works great when it does, but compatibility NOT guaranteed
I initially installed this with the base model Nest Thermostat. There’s another review with pictures showing how to set it up. However, it did not work in my case. The Nest freaked out- it was showing the temperature as being way higher than it actually was (+15 F!!!), and I even got an email from Google saying I should immediately unplug the c-wire adaptor to avoid damage to my thermostat. So no, this adaptor is not always compatible with the devices that it claims. A lot is subject to your particular HVAC setup and its peculiarities.I ended up returning my Nest and getting an Ecobee 3 lite instead. The c-wire adaptor seems to be working perfectly with it without any issues (so far).I’ll give some advice, including repeating what the other reviews have mentioned so that you can have an easier installation process.First, other than the lack of a c-wire, make sure your wiring and heating system is compatible with the smart thermostat you’re using. Your thermostat company of choice should have a compatibility checker.Second, once you plug this in, the wire is LIVE. It should go without saying that you should INSTALL FIRST, PLUG IN SECOND.Third, if you own your home, i.e. you have the ability to mess with your HVAC wiring, just do that and forget about this product. You’ll likely lose independent fan control but I don’t see why that matters unless your fan is also a de-humidifier (in which case the situation might arise where you might want to run your fan without also running heat/cool). I live in an apartment and my fan is also a dehumidifier, so I’m a good case for this product.Lastly, This adaptor has two wires. One has a black stripe on it and the other one is plain white. I read in another review that these do different things, though I haven’t tested the voltage/polarity myself. the white wire, without the black stripe, goes in C. My system has 4 wires: G, Y, R, W. When installing an Ecobee (probably also works with the fancier Nest thermostats, and some may have success with the base model Nest), the black-stripe wire gets bunched in with the R wire in the Rc slot, and the white-only wire goes in C. The wires in this adaptor are pretty thin but it can still be tough to fit it in with your R-wire. Other than that, follow all instructions in the instruction manual of your thermostat.Hope this is helpful!
David R. –
Allowed great update to home heating system
Works perfectly to provide power that allows use of programmable thermostat in home with only a 2-wire connection to an almost inaccessible furnace in a crawl space.
David Guerrero –
Llegó abierto y al parecer usado…
Kevin Nicholson –
Nest E thermostat wouldn’t work with new (2-wire) propane furnace (power error).Connected this to R and C and problem solved!.
Rebelgrrrl –
I have a two-wire millivolt fireplace that didn’t have a C-wire for my Sensi smart thermostat (which worked as a regular thermostat instead). This very inexpensive adapter turned my simple fireplace into a smart one now controlled by the Sensi app and Alexa. It’s a really good solution to a vexing problem. Includes wiring instructions and a lot of wire to run from the thermostat to the electrical outlet. You can also trim the wires to length.
Gerard Watson –
Delighted with my purchase of this television
Rodrigo S. –
Just what I needed for my Nest Learning Thermostat 4th gen. It worked perfectly and was easy to set up.