[woodman58]

Jazzman should be able to tell you if Ditra plus a thickness (?) of plywood will do the trick. But he will need to know the thickness of the tile.

 

[JazMan]

It's possible for the new kitchen tile floor to be very close to the original 3/4" hardwood if the 3/4" is the difference. But, what kind of subfloor and how thick is in the kitchen and is it the same throughout?

While you're at it, let us know the type and size of the joists, their condition, species and grade if possible, spacing, and unsupported span to the inch.

Jaz