Ah, thanks....yeah, it's not available in the US for some strange reason(maybe voltage diffs?)....many discussions here about that.Based in Denmark - it was an optional extra purchase (in USD something like 15 or 20 if I remember correctly). Quite nice as it is really easy to adjust the heat. For the first couple of weeks I don't use it as raising the plate will do the same basically but then you can start reducing heat while keeping the plate at its max height.
cheers
Very frustrating as it really needs it, the plate can be way too hot without the rheostat.