This Technical Report refers to EN 15316-4-8:2017, module M3-8.8. It contains information to support the correct understanding, use and national adaptation of EN 15316-4-8:2017. This Technical Report does not contain any normative provision. The scope of EN 15316-4-8:2017 includes three categories of products: • air heating systems means a system with one or more warm air generators for heating purpose. The hot air may be diffused in the installation space from the generator or distributed via a ductwork. • overhead radiant heating systems, means systems using gas and designed to provide heat into the installation room. Radiation may be generated directly by the flame (overhead radiant luminous heaters) or by circulation of flue gas in a ductwork installed near the ceiling (overhead radiant tube heaters). • stoves and local heaters means local devices that provide heat by transferring the heat generated by combustion into the surrounding environment.