TempZone roll 240V 20ft x 1ft 6in 20-15B-240: 18" W x 242" L Heats beneath tile, stone, hardwood floors. Dimensions: 18"W x 242"L Circuit check installation aid available to ensure fault free installation Step-by-step installation guide, instructional DVD and warranty registration included Lifetime technical assistance and 24/7 installation support UL Listed. Delivers 25% more heating capacity as compared to most competitive systems