This Pro Warm inscreed electric underfloor heating system is designed to be used beneath or within traditional screeded floor. in addition this kit can be used extremely effectively with thick tiles or flag stones. It features a 5.5mm heavy duty, twin wire earth screened cable rate at 17w/ Lm with an output range from 160w to 220w per square meter depending on cable spacing. This loose cable system is perfect when more flexibility is needed with small or awkwardly shaped floor areas. Each kit comes with a lifetime warranty.