Low voltage 3 wire fireplace need to hook up to zwave switch

So - maybe I am missing something - but isn’t there a way to just put a zwave extension plug inline where the fireplace plugs into the 120v and then leave the fireplace switch on the wall always on and then just control the fireplace with Smartthings/Alexa? If the switch needs the 120V power…this would cut/open the power source.
(and I am NOT an electrical guru…just trying to think from a common sense standpoint an alleviate relays etc)

I have a GE Zwave In-wall light switch that I am wanting to conenct to our gas fireplace. There is no power at the existing switch as described above it is just a 3 wire line. Here is a link to the switch: https://www.amazon.com/GE-Repeater-Extender-SmartThings-14291/dp/B01M1AHC3R/ref=sr_1_1?s=hi&ie=UTF8&qid=1543945173&sr=1-1&keywords=zw4005

Can this be used for setting up alexa to turn the fireplace off and on or do i need a different type of switch? Thanks

You will need a “dry contact” switch or relay. The GE switch will damage your fireplace because it relays 110V.
See my post above.

How do you connect the ZFM-80 dry contact switch to a smart things hub or alexa?

You need to use a “custom device type” the code is in one of the posts above.

Here is a good FAQ on how to actually do it.

With any automations for a fireplace, please make sure you are still in compliance with your local fire / building code. (Or you decide not to)

I am having trouble getting my ZFM-80US to be discovered by my Smartthings hub. Any ideas as to what I need to do or if I need to create the custom device type how do I go about doing that and adding the code you have written? I’m somewhat computer savvy so if you point me in the right direction I may be able to figure it out. TIA

I was finally able to get it added by using the smart things classic app instead of the latest one. Now that it is added the app nor alexa will actually turn it off or on by voice or by trying to turn it on and off through the app itself. Any ideas?

Does it show the correct status in the app if you turn it on/off manually?

No sir it does not. It says device is unavailable.

Does the actual switch work to turn on/off when you use it manually?

Yes it does. I just blew everything away and started over using the SmartThings classic app. Once I did that and brought everything in fresh it paired exactly like it is supposed to. I think I may be good to go at this point. Thank you for your help I really appreciate it.

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There was no need to start over. You can use both apps concurrently.