Easy Heat 200' Roof/Gutter Cable with clips and spacers. This cable has a capacity of 5W per foot and is CSA & UL listed. It provides an uninterrupted path for melting water, preventing ice dam formation and promoting the free flow of water through gutters and downspouts to ground level. Versatile design adapts to most roof and gutter configurations. Avoid roof damage and leaking. Other related products use of a temperature sensing control, such as the roof sentry RS-2 is highly recommended. Fixed resistance also available in pre-terminated lengths from 20 feet to 240 feet.