I'm restoring a small powder room that had an old cast iron radiator. The radiator takes up valuable space and am wondering if I can put pex tubing in the wall for heat. The floor is concrete, so that's out. I'm currently installing radiant hot water heat in the adjacent hallway and kitchen using the "warmboard" system, so I'll have leftover pex tubing and a place to hook up. The walls are gutted down to the brick (no insulation). I'm thinking of wrapping walls and ceiling with reflective insulation, running tubing between studs and then installing my drywall and beadboard. I know that heat rises, so that's a negative, but it seems like a cost effective solution since I could add it to end of an existing zone. What are your thoughts?