I am looking at flooring to go over an UFH system and have come across a lot of sites selling "engineered oak" as suitable for this purpose. The description of these floors however sound to me more like laminate i.e. a sub layer (be it of oak or ply) covered by a top layer of oak of varying thicknesses.
I thought that engineered oak was made by taking pieces of oak and gluing together to form a piece less likely to warp. This is certainly how the "oak" patio doors I have installed is made.
Cheers
Martin