Why does not heightmap texture can be offset/tiled while using it for tesselation ?
Sure as hell it can be tiled.
Why didn’t you use search function to prevent this thread ended up empty making an answer harder to find in the future?
http://forum.unity3d.com/threads/173266-tessellation-tiling
I just looked “Tessalation Tiling Unity” to get the result 
It should and I hope it will fix your problem 
Thanks, what about offseting ?