ᐅ Installing underfloor heating with minimal installation height

Dear forum members,

We would like to add underfloor heating to our house.
We understand what needs to be done, so please no answers like "leave it to a professional."

Now the questions:
- Which retrofit underfloor heating system with a low installation height would you recommend (considering durability)?
- What is the minimum insulation thickness you would recommend between the hollow-core concrete slabs and the underfloor heating? Which insulation material would you suggest?

We need to be economical regarding the installation height. The price should also remain reasonable, but the system should be of good quality.

Any recommendations?

Thank you very much!

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