Once a centre of military strategy and secret meetings, now an icon of luxury: the Old War Office in London has undergone an impressive transformation. The historic building, which was once the workplace of some of the most influential politicians of the 20th century, has been converted into an exclusive hotel and residential complex – The OWO. The aim was to maintain a delicate balance between preserving the architectural heritage and providing state-of-the-art technical facilities. At the heart of this luxury project was a heating and cooling system that combines maximum efficiency with maximum comfort. Numerous HERZ products were chosen, from drinking water valves to ball valves – a clear sign of quality and precision.