So much can go wrong during the install and my install was very drawn out with times when the heating circuits were exposed and in peril of being damaged. The circuit checkers allowed us the confidence to proceed with a project confidently with 1000s of dollars of tile and finish work to be performed after the heating element install, before the system could be given the ultimate installed test. Nice touch and I could not imagine the anguish that these devices could save a contractor or homeowner. Thankfully we enjoyed a textbook install but knowing of the existence of a problem the instant it occurs is a priceless feature.
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