Over the years GF-ELTI has designed, manufactured and installed new Reheating Furnaces and, at the same time, has carried out important revamping activities on technologically outdated plants in terms of thermic efficiency and emissions into the environment. All the Furnaces installed have been realized and conceived according to the still current Modular Prefabrication Technique. Their beating hearth is the combustion system, characterized by Regenerative Technology and advanced self-adaptive control systems. The use of mathematical and thermo-fluid dynamics modelling systems, combined with the latest generation of PLCs and HMIs, as well as with interactive control-management software, makes it possible to obtain top quality operational and performance results. The acknowledgments obtained by International Research Centres and Customer loyalty are the best confirmation of GF-ELTI Plants’ performances.