 During the air attack on Heilbronn on December 4, 1944, the company buildings on the Koepffstrasse were totally destroyed.After the end of World War II, business was slowly restarted and the destroyed buildings were gradually raised again.With the aid of Wilhelm's son, Helmut Bälz, the company developed heat exchangers and electrically and pneumatically operated valves mainly for steam and thermal oil applications, developing the closed steam/condensate circuit back then.