Vaillant Learn more FOSTEC & CompanyReferencesVaillant Vaillant is one of the world’s market and technology leaders in the fields of heating, ventilation and air-conditioning technology. For more than 140 years, Vaillant has been pursuing a strategy geared towards sustainable and profitable growth. Today, the family business has 10 production and development sites in 6 European countries and in China. Industries: Construction & Building Materials Visit Website