Too weak heating cables / constant heating cables with low power prevent ice formation in the outside area / gutters if necessarynot reliable ! 1. Thermostat is built in: switches automatically at approx. 3 degrees Celsius - wMaintenance-free, economical, easy to install: roll out, plug in, done! - Gutters larger than 150 mm width: 2-fold parallel laying in the gutter ... if the ambient temperature drops, the heating output increases. ... and that at every point of the heating tape depending on the one there existing ...