Electric Heting mat

[dralms]

We recently had a Watts Electric heat mat installed under tile, the system works great, but the tile job was less than desired. The tile company has suggested using a leveling compound and new tile on top and at no cost. While I don't believe this should affect the performance of the heating, I thought I would throw the question out for comment. I theory it just changes the thermal mass, but I'm not sure if there is an issue.

Thanks

[Christopher]

If the heating element gets more than 1-1/2" below the finished surface of your new tile, you'll start seeing the time it takes to heat greatly go up, and possibly less heat output as well.
Otherwise, there really isn't a problem with what you plan to do.