The Herzberge Boiler House Museum (Museum Kesselhaus Herzberge) is located at the former hospital complex known as the Evangelisches Krankenhaus Königin Elisabeth Herzberge (KEH), now a historically protected monument. Built from 1889 to 1893 by city architect Hermann Blankenstein, it served as the source of heat, warm water and electricity for the entire complex for more than one hundred years (until 1925). Since 1999, the employees of the KEH have worked to preserve the building and give it a new function. After a three-year intensive refurbishment, the museum was opened in September 2003. On display are three generations of boilers at their original locations on two floors. Also on display are technical and office-related items dating from 1893 to 1988. A permanent exhibition is devoted to the builder of the hospital. The medical-historical exhibition introduces visitors to the history of the Herzberge medical complex of the Königin Elisabeth Hospital (known since 1992 as the KEH). Works by contemporary artists are also on display in the Blankensteinsaal.