Radiant in-floor heat is growing in popularity and it should be noted, there are some places where the tubing shouldn’t be placed. See below!
The image below shows two sources of heat; the fridge trying to move heat out the bottom and the lines in the floor (reflected by the shiny stainless steel) show the radiant in-floor tubing. The heating system was just getting going (10 mintues after firing the boiler) so the floor wasn’t up to design temperature yet. As the slab gets significantly warmer, these two sources of heat will fight each other and the fridge will lose by decreasing its ability to lose heat into the kitchen. Take note radiant people, don’t install radiant in-floor tubing under cabinets and especially not under refrigerators!