The Art of Heating… Alarko steel panel radiators are produced in series and complying with DIN EN 442 through the high-tech computer controlled modern production lines established by Alarko Steel Panel Radiator Production Plant. The dies which are used in the production were prepared in Germany. Welding lines and test pool were designed in Switzerland. Surface preparation, coating and painting facilities have the most recent technology. The main casing of radiators is produced from cold rolled steel in comformity with EN standards.