Swiss Architect bureau Kämpfen für Architektur in collaboration with Doma Solar retrofitted a 1970 the fifty-apartment residential building in Zurich in Switzerland using Kromatix™ thermal collectors. The Kromatix™ thermal collectors heating the hot water demand for the residents. This is Switzerland’s first Minergie-A renovation of an apartment building and won the ‘Prix Solaire Suisse 2017’ award.