I've done this before. Makes ya lose your faith in manufacturers. When did it open? Smokey Mt Frank In a message dated 7/23/2011 4:04:44 P.M. Eastern Daylight Time, rbuck@xxxxxxxxxxxx writes: I've never tried this trick before: putting the thermostat in a pot of water and observing the temperature at which it opens. This is a brand-new, unused 180F thermostat from Otter Zone. Here it's closed at just under 200F: And here, it's wide open at just OVER 200F: It sure seems like a 195 thermostat to me, but it's marked 180. I dunno. r