Underwriter’s Laboratories (UL)

An independent testing agency which can be hired to test and assess the operation and safety of almost any item or product. Once the item has been tested and approved by Underwriter’s Laboratories, the manufacturer can put a UL sticker or tag on the item to show that it has been tested. ComfortTile, WarmTrax, QuickNet and BlueHeat have all been tested and given a UL approved certificate.