Q: One visitor asked, "We have just finished installing hardwood flooring over radiant heating in our kitchen. We have one area approximately 15" x 20" that is not level and is noticeable when walking. Is there any wood floor product (epoxy, urethane) that could actually be poured into this "valley" in our floor and would dry level with the clear finish that the floor already has? We would rather not pull up the planks at this point."

A: I am sure there are any number of patching compounds you can use to level this area in your kitchen. I did a quick scan of the Bostik site, and they had a number of products which should meet your need.
I hope you consulted the specifications regarding the hardwood floor you installed. They don't all warrant installation over radiant heated floors. This would necessitate removing the flooring in the area with the cavity, which is something you don't want to do. I am not aware of any other type of liquid product that you could pour onto the surface of your floor to bring that section up to level with the rest of the floor. I would say I am 99.999 percent certain there is no such product on the planet. Unless this dip is severe, I would suggest you live with it. I would think that in no time at all, you will simply forget it is there.