Yes, I actually just got one for my FLUE Switch for LOW Temp stoker cutout at around 80 degrees, so it doesn't keep pushing coal if it thinks the stove has gone out.
These are very simple Snap Acting Temp. Switcheshttp://www.thermodisc.com/
You can get in just about any temp and/or configuration
We just had that scare Sat. Morning, I could smell something HOT and the convection blowers hooked into the Rehostat didn't come on and the stove got a bit hot, I unplugged from the stove and plugged directly into an outlet and they worked. The rehostat must have burn up or something? My pipe temp going upstairs was almost 200 degrees !