Abstract: A method for providing technical service to an agricultural working machine is provided. A digital service module of a server coordinating the technical service receives a request for service, the request for service including at least one part and at least one service needed to fix a problem with the agricultural working machine. The server includes a database, which stores information about locations of parts (which may be in service vehicles, locations assigned to service providers, or at a central storage), service providers, and part runners.

Abstract: A heat exchanger for swimming pools, formed of generally cylindrical housing, through which flows a first medium while a second medium flows through a line designed as a spiral within the housing. The spiral shaped line is formed of a corrugated hose and possesses separate connection fittings for the second medium, namely the corrugated hose. The corrugated hose is connected by its end sections which extend in an axial direction to likewise axially extending sections of the separate connection fittings for the second medium.