I want to commend "Jeff" who assisted me on my chat on your website.
He was very, very helpful! We have a thermostat for a master bath floor heating system (installed by the builders and previous owners of our current home), that malfunctioned after a storm. It heated to over 100 degrees and would not shut off. Jeff walked me through everything (including turning off the thermostat and breakers) and advised that I buy a replacement thermostat and suggested the proper models. He may have saved us from damage to the system or even a possible house fire! It was support case TTK53771.