If the system is designed and installed properly, and care is taken with the preparation of the slab, it will not have surface cracking due to the floor heating.
The floor heating piping must be at a specific depth within the concrete (or deeper), and the steel reinforcing mesh as close to the surface as possible.
Expansion joints will most likely be required – collaboration between the structural engineer, the concreters and the floor heating contractor is required.
Euroheat has been successfully installing floor heating into polished concrete floors for almost 30 years.
