Already in 2014, more than a year before the introduction of the first stage of the Ecodesign Directive ErP for heating systems and compo­nents, the successful co-operation between VIESSMANN SAS in Faul­quemont and va-Q-tec AG from Würzburg started. The focus was not only on the usage of highly efficient VIPs, but also on a design that is as effective as possible and on integration into the production process as efficiently as possible. By means of the usage of VIPs, VIESSMANN was able to successfully position quality hot water tanks on the market initial­ly in the highest energy efficiency class A and later also in A+. The port­folio was not only expanded in this way, together a good contribution was also made to the topic of energy efficiency.