I screwed up. We renovated this spring and retrofitted our home with hydronic radiant heat. I poured a 2" suspended slab with radiant tubing on the main floor of the house and when I was running the tubing for bedroom I mistakenly ran it into the bathroom (wasn't clear where the door was going). So, the master bath has about 10 square feet of flooring that is heated on the much colder bedroom zone and it is not only uncomfortable but the btu's lost is making it hard to heat the bathroom on really cold nights (it was -9 F the other night). So, sadly, I am going to tear up the tile and ditra and gently bash out the concrete and fix the tubing error. I am comfortable with all of this except the part where I will need to redo the tile. Any tips or suggestions on replacing six 12" by 24" tiles on ditra so they match up with the existing flooring?