For those that own the Robobrew I wanted to see if this would work for making kettle sours? Does it have a safety function that shuts it off over a period of time like the Mash and Boil? Meaning can it be left on for several day if you want? Can you choose to heat at temps 90 deg and up? I want to have a brew set up totally separate for sours and the Robobrew seems to hit several issues like space and ease. Thank you for your response in advance.