Can this flooring be installed over an electric mat heated underfloor?

Hello Charley and thanks for your question. The Style Selections Rigid Core Luxury Vinyl Tile can be installed over radiant heat flooring. However, the heating system should be turned on prior to installation of the vinyl tile, the flooring should never come in contact with the metal heating elements, and the temperature should never exceed 85 degrees Fahrenheit. For more information regarding warranty and/or installation, please visit the product page on the Lowe's website and scroll down to find Warranty and Installation Guides. Thanks again for your interest in the Style Selections Rigid Core Luxury Vinyl Tile.