I think your Overestimating how much heat this thing puts out..yes 200W sounds like its outputting a furnace but its really not. Its hard to explain if you havent used it but its meant to be a desk heater pointed at your face so obviously its not going to be blowing scalding air out...it puts out a mildly warm air I find similar to say turning the heat on in your car. It works great with a BrewPi I can attest to using it for well over a year, but i could maybe see it being too powerful for the STC1000 to not prevent wild overshoots but even then i doubt it? Still its not that hot and takes a long time to heat up my 7Cft stand up freezer..
No, I don't overestimate. 200W is still 200W. Yes, since it has a fan, it won't get burning hot to the touch, as say a 60W light bulb (without a fan) will. But it still puts out way more power than needed. It is not a controller issue either, it is simply more heat than is needed.
You just need enough heat to slowly push the temp to where you want it. As long as you can reach it, you have enough. As it is an enclosed, insulated environment, a little heat goes a long way.
@stpug has got it right. The thing will be operating while you sleep and is at work, you won't be watching it like you would your home built brew controller on brew day. If your space heater works for you, then fine, I don't debate that it won't *work*.
Look at it this way, when were the last time you were in a car crash? I've never been. Guess, using seatbelts is pointless then.
I'm just saying that there are better and safer solutions. Something that won't overheat to the point where it could be dangerous, even if the controller fails, fan fails etc.
I've had this discussion before, and the replies I get are usually "It's worked for me for x years without a problem" and that I'm just crazy paranoid. That is ok, you make your own choices. I'm just putting in my opinion on the matter.
I'll give you that the space heater thingy isn't the worst thing I've seen, as it at least has overheating protection and is probably just about 4 times too much power.
But still, why should you, when you have the option, get something that is just somewhat unsafe and and out of spec, when you can get something that is safer AND better within specs for pretty much the same amount of money?
Finally, if you already have the space heater. Let me suggest opening it up, add a rectifying diode in series with the heater. This will halve the power output to 100W. While you have it open, also add a thermal fuse, if it doesn't have one (that is a thermal
fuse, not the resettable overheating protection which is probably just a bimetal termostat).
Thermal fuse and a properly sized fuse is always a good idea.