All Heat-Line products feature self-regulating heating cable (conductive polymer) technology which has the ability to increase heat output with cold but more importantly, decrease heat output with warmth. With this unique technology, every Heat-Line system is designed to prevent over-heating of pipes while maintaining them from freezing efficiently. The main benefit of self-regulating technology is it allows the use of thermal pipe insulation for the first time. Prior to Heat-Line and self-regulating heatin