hose 130 to be drained of material in advance of cooling in the system sufficient to allow solidification of material therein similarly the early warning capability of the present design in conjunction with secondary containment could prevent chilled volatile compositions from arriving at their application points at too high a temperature for safe application thus the present design provides significantly reduced risks of spills system damage and can even provide for safer system operation these advantages are not provided by earlier designs wherein the thermal transfer fluid is carried directly by an outer hose turning to fig4 there is shown a cover assembly 200 that is yet another embodiment of the present invention in assembly 200 a set of profiles 210 a and 210 b are retained in pockets or sleeves 220 a and 220 b that are attached to a flexible cover 230 cover assembly 200 is primarily contemplated for use in established systems that require for example supplementary heating however cover assembly 200 might also be incorporated as part of an original system design cover 230 is preferably formed from a flexible fabric that can be wrapped around the pipe that is to be heated although conventional fabrics are preferred for most applications for.