Since November 1973 hotset has been producing and distributing heating elements from Wefelshohler Strasse (Lüdenscheid) worldwide. Through continuing expansion, extension of the product range and production of larger quantities the number of employees increased. Therefore the plant was extended in May 1986. As the economy grew hotset decided to move the hotspring® coil heater production to the Hoffmeister Strasse (Lüdenscheid). This location was also extended in 1999.
In spring 2002 the decision was made to expand the production capacity even more. At the end of 2002 the production of heating elements on Malta started after a planning phase of only 6 months. The Malta-team contributes to a great part to the hotset production.