Flexible conduits are corrugated protective tubes for laying and protection of transfer media piping in heating systems. Flexible conduits provide protection against damage during installation and operation of a heating system with dimensional compensation to prevent damage of the piping inside from thermal expansion and shrinkage. The conduits are very flexible and boast a great impact resistance. The corrugation facilitates bending and braces the conduits. The flexible conduits are laid on the subfloor before casting the flooring mortar. The product is highly resistant to most construction chemicals and pressure ratings.