Ceramic, porcelain or stone tile? Which material is the best choice for underground heating? You may ask this question in different way to reach the right answer. Which material has a higher heat conduction and durable? Of course stone tiles such as marble tiles or travertine tiles has higher heat conduction and these kind of materials are more durable than alternatives. Stone tiles are natural as well. Thickness of tiles are also imported as well. If you prefer 10 or 12 mm thickness stone tiles for your underground heated floors it gonna be best choice. Less electric consumption, quick heat transfer, durable and natural!