well, yeah. You're not just checking for opening, but when it opens. My buddy, Brian, and I had a "boil-off", years ago. We put about a half dozen or more different branded t-stats in a pan of heating water, monitored with a candy making thermometer. I distinctly remember that the best one was made by Robertshaw. Unfortunately, I don't think they make them anymore. Some of the others were pathetic. It might even be worse, nowadays.
