That is 120V circuit like many small space heaters that people add as a supplement to the main heating.
ok, so this app does have an emergency stop function and goes in to it when it does not get a temperature update for a max of 90 minutes but can be set to be lower as you wish, this will only be active if the heater is heating, if it's idle, it should not go in Emergency stop.
This is your choice and whatever works best for you is good, the perfect sensor would be mains powered and report every minute but those are hard to find unless you make it yourself.
Not exactly sure whet you mean here, sorry.
Hope so but also hope to get more free time to implement a bunch of stuff that was asked from users of the app, I'm also looking into using the builtin virtual thermostat and have the app control it just like it's doing right now, the main reason is to make it Homekit compatible. I will have to test things out, but after some research here and there, I think it would be possible.
