My fireplaces in my house use a standard on/off switch but aren’t connected to high voltage, but rather just a switch for the fireplace. I really want to have smart things control over it, any product recommendations to make this happen?
I am not aware of a DC/battery powered relays for ST.
This means you need an AC source to power a relay, AFAIK, to power a ST Switch to cause the fireplace circuit to be opened/closed. I have the same situation in my house.
Also, I will note, there are reports by some here recently that all or many switches in their home were inexplicably turned on by ST at a random time. For at least one this included their fireplace.
I won’t hook up my fireplace to ST for now.
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This is how I did mine. It works great. I can control via the app, echo, and the wall switch.
I think I did a really detailed write up but I can’t find it.
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Check your local residential code first. In some jurisdictions, for safety reasons, it is actually illegal to have any kind of remote control over a fireplace that would operate out of line of sight. This would include any smartthings-control over the fireplace switch, since, as was already mentioned, even if you don’t set up a rule to turn on out of sight, the SmartThings platform might go bananas and turn it on anyway. (It has happened.)
Speaking just for myself, I don’t put anything on home automation that would be a safety hazard if it turned on unattended and remained on for 12 hours. But that’s just me. 
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I’m using the following - works well in my setup.
@Mike_Maxwell wrote a great custom handler for the Remotec Zwave Relay. best feature enables the auto shutoff after 60 minutes (or desired number of mins)
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I will say this… There are quite a few different ways to do this… because there are a lot of different fireplaces.
But, and this is very very important.
Your fireplace is probably 99.9% one that is powered via a low power switch. When you open the switch on the wall, if there is a small wire (looks like phone line maybe) it is definitely low voltage.
Absolutely do NOT apply 110 vac to your valve control. You WILL destroy it.
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If you’re not comfortable with electric circuits, working with 110/220, know how to use a multimeter, or tinkering with a gas appliance that can KILL YOU… ya, may considering not doing it or getting help from someone that is.
Lots of good ideas on how here for sure.
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I also use a ZFM-80 relay. I modified the para,enter so the relay itself times out and turns off after 20 min, irrespective of what ST tells it to do. Works well for me, and the timer provides an additional level of safety.
I think I’ll go the ZFM-80 relay route. My plan is I have a temperature sensor in each room where I have fireplaces, and to have a piston set to turn the fireplace off automatically once the room has reached a certain temperature not only as an additional safety feature but as an automatic comfort feature as well.
Again remember to check your local township first for regulations, as if you install something which is a violation of code and a fire then occurs your homeowners insurance probably won’t cover you. So just for your own sake it’s good to check before you start investing in devices.
Second, you want to make sure that whatever your safety feature is, it does not depend on SmartThings in any way to work. This is really important. After all, what you’re protecting yourself against is a platform failure on the SmartThings side. (Like the person who had all their Z wave devices start unexpectedly, including the fireplace switch.) so by definition smartthings is being flaky when the problem is created. That means you want a failsafe outside the smart things platform. Because there’s no predicting, for example, if smartthings takes the platform off-line “briefly” to fix the problem while your living room is in danger of catching on fire. 
The people who’ve set up the relay to automatically turn itself off have done this not with a piston or a smartthings routine but the configuration of the device itself. So it would work even if SmartThings was off-line.
So if you find out it is legal to do this in your area, then design both a SmartThings-controlled system to turn The switch on and a completely separate outside of smartthings failsafe to turn it off again If your safety parameters are exceeded.
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I want a fireplace switch which, when pressed, would check if both I and the missus are in the room, and if it’s past 11pm, and if so it’d turn on the fireplace on, and would start the Slow Jams station on Pandora, and would turn the lights “down low”.
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I’m pretty sure you could do exactly that 
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You could do all of that, but you’d probably need I beacons to limit the presence to “in the room” rather than “in the house.” 