Like you i wanted to use a decoupling membrane plus i like the waterproofing of ditra in the bathroom.
Using nuheat cable with ditra heat mat.
Ditra heat mat is about 1 4 inch thick.
Use standard mats for rectangular or square areas and fill in with cables for the irregular angled or curved.
Uncoupling waterproofing vapor management and support to ensure a long lasting installation.
The stud structure of ditra heat is specifically designed to allow for the easy installation of ditra heat e hk heating cables.
How to install nuheat heat matt with schluter ditra on a plywood subfloor.
Whether you use ditra xl 1 4 inch hardibacker or whatever is up to you.
Ditra does not recommend using anything but their own heating cables but nuheat advertises that their cable system works just fine with the ditra heat membrane.
Uncoupling waterproofing vapor management and support to ensure a long lasting installation.
The nuheat heat mat should be installed on the plywood with a good quality polyme.
Alternatively you could use ditra heat mat only where you want to heat but i would recommend another similar height tile underlayment to use with it.
The nuheat cable may also be installed in combination with the nuheat mat system.
I liked the nuheat system better than the ditra heat cables so i bought the.
What you can do is run that mat everywhere but only heat the parts that you want.