Installation of a Hitachi Yutaki S heat pump combined with a Buderus oil boiler. This system supplies two separate heating circuits, fan coils and underfloor heating, with different water temperatures, which are compensated according to both the outdoor temperature and the indoor temperature of each space, maximizing energy savings. At the same time, a third circuit is used for the production of domestic hot water through the heat pump. Austria Email tanks, Wilo electronic circulators, and Innova fan coils were used for the installation. The operation of the boiler, as well as all installation automations, are controlled exclusively by the latest-generation electronic decision-making system featured in the Hitachi Yutaki S.