Heat-Line heating cable/ heat trace products products offer cost-effective operation, product reliability, and product longevity unlike any other heating cable system on the market. All Heat-Line products employ unique, self-regulating technology which enables each product to vary its power output in response to temperature at every point along its length. As temperatures increases, Heat-Line products automatically decrease their heat output, and vice versa. The result is energy savings, when heat is not needed and rapid heat increase when heat is necessary.