What is a recommended heating mat power for bathroom installation?

The heating mats CTAE-100 and CTAV-160 with 100W/m2 and 160W/m2 output recommended be installed directly into the tile glue layer on the concrete base or old tiles, mosaic surface, without changing the existing floor structure. The thin only 4.2 mm thickness heating mat easily fits in the tile adhesive layer, so it doesn’t raise the floor level.