@bmmiller I use mine at work with my dyson heater/fan to do exactly that. So the easy answer is yes it works. If you use my DH it has learning built into it. Just set your remote code to 000 and configure, then use the learning slider to select the learning position you want to program and select “learn” the unit will flash once and you press the remote for the code to be learned while aiming at the zxt-120, it should flash twice for success and 4 times for fail. If it fails just try again.
I have found for some reason the remote code just stops working. I have to relearn every once in a while. I don’t know if it’s some weirdness with the Dyson or an issue with learning. I only have to do it once in a while but I have not figured out what makes it forget the learned code.
If your heater has a discreet on and off command then you could program one of the temps to on and then program “off” and it should work.
What I did was a little tricky though because there is no discrete on/off. So I added a zwave smart switch to the mix.
To turn off my heat I turn off the smart switch.
To turn on my heat I turn on the smart switch, I then created a “smart lighting rule” to “turn on” the zxt-120 when the smart switch is turned on. The DH is currently set to issue a cool command when “on” is selected. You can change that to heat or just teach your heaters code into one of the cool settings. I just taught my zxt-120 that “cool 79-80” degrees" = code for my dyson “ON” command.
On another note, at home I decide I didn’t want this complication so I bought a space heater with a manual on/off so I could simply use a smart switch. This one works great. https://www.amazon.com/Vornado-VMH300-Whole-Metal-Heater/dp/B01J664WLQ/ref=sr_1_17?ie=UTF8&qid=1491250796&sr=8-17&keywords=vornado+heater
Given that this heater cost almost the same as the zxt-120 it might be a better solution.