The heat pump provides heating, hot water supply and cooling of the house. At low temperatures, when the power of the heat pump is not enough, a backup source - a gas boiler - is turned on. The combined buffer capacity Expresso 800 HF / Paradigma, which is specially designed for combining high- and low-temperature heat generators, unites two devices. The Expresso 800 HF also includes a flow station for hygienic preparation of hot water. The facility is equipped with a fan with heat recovery and Frankische flexible polymer air ducts.