Warmup Ice Deicing - Roof & Gutter Heating - WRGH Kit Include; Cable, roof Clips, Spacers Warmup WRGH cables are intended for use on all types of roofs, including rubber, metal, clay and asphalt shingles. The Warmup WRGH is a constant wattage roof de-icing system supplied in pre-terminated plug-in kits. The Warmup WRGH is a constant wattage roof de-icing system supplied in pre-terminated plug-in kits.It is offered in sizes from 30ft to 240ft, from 150W to 1,200W. It is supplied with roof-fixing clips