The new Grid Floor series of underfloor heating is characterized by the special configuration of the grid made of recycled plastic (polypropylene), which combines the simplicity and speed of installation of the tubes of the node plate (Noppjet) with the advantages of optimal heat exchange of the "flat" Rolljet systems and Klettjet. In fact, the pipes are firmly fixed to the plates while at the same time they are in full contact with the hot concrete, which fills the perforated nodes, improving the heat exchange of the system. Also, due to the fact that the reinforced concrete penetrates into the perforated nodes, which act as a reinforcing mesh, it is "reinforced" to such an extent that we can reduce the thickness of the reinforced concrete to a minimum. The system is also shown to have lower thermal inertia, height and weight.