Warmtouch® Radiant Heat
This bathroom, and other rooms in this addition got floor heat.
The photo you see is during the installation of the heat "mats". Since this is one of the extensive "record" photos of the mat locations, the blue masking tape is to show the break points for each mat.
You can see by the mat layout, when compared with the
next photo,
that there is no heat located under the pool table or under the bar.