I use double Rancos and have never had a problem. I also have a Herpstat and like it alot. On the spider Robotics website, they detail how they are using more expensive parts than their competitors because of t-stat failure concerns and even suggest using an inexpensive enrty level t-stat plugged into the wall,set slightly higher and then having your regular T-stat plugged into that to give you extra peace of mind.

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