I endeavor to keep my stovetop temps in the 400 - 600 range when cruising, and always below 700F when getting ready to engage the catalyst. I did once see over 700F on one of my Condar magnetic stovetop thermo's, maybe 740'ish if I had to guess (it's only marked to 700F), but my IR gun read 699 on that location. Made me nervous, as the stove top was pinging more than I'm used to hearing, but I suspect the stove was no where near any level of self-destruction. I carefully read the Jotul manuals for my old Firelight 12, and there's no mention of stove-top temperatures, recommended or maximum. So, I pulled up the new manuals for the Firelight 600, and found recommended ranges for cruising efficiency, but again no maximum temperature listed. What should one assume as a max safe temperature for cast iron?