Machine for making ice-cream, comprising: - a support and housing structure which accommodates a first production line and a second production line, wherein the first production line comprises: - a first inlet conduit with a first end connectable to a source containing a starting confectionery mass, and a second end, - a first inlet pump connected in the first inlet conduit, - a first mixing and chilling chamber with an inlet opening for the confectionery mass, connected to the second end of the first inlet conduit, and an outlet opening for the ice cream output, - a first outlet conduit with a first end connected to the outlet opening of the first mixing and chilling chamber, and a second end, - a first outlet pump connected in the first outlet conduit, - a first cooling circuit in heat exchange connection with the first mixing and chilling chamber, wherein the second production line comprises: - a second inlet conduit with a first end connectable to a source containing a starting confectionery mass, and a second end, - a second inlet pump connected in the second inlet conduit, - a second mixing and chilling chamber with an inlet opening for the confectionery mass, connected to the second end of the second inlet conduit, and an outlet opening, - a second outlet conduit with a first end connected to the outlet opening of the second mixing and chilling chamber, and a second end, - a second outlet pump connected in the second outlet conduit, - a second cooling circuit in heat exchange connection with the second mixing and chilling chamber, wherein the machine further comprises an auxiliary conduit configured to allow to selectively connect the first outlet conduit in communication with the second inlet conduit or with the inlet opening of the second mixing and chilling chamber and disconnect them from each other, in such a way that: - with the auxiliary conduit in the disconnected configuration, the first and the second production line (3, 4) process confectionery mass flows independently of one another, and - with the auxiliary conduit in the connected configuration, the first and the second production line (3, 4) are placed in series and together process a single confectionery mass flow. - a support and housing structure which accommodates a first production line and a second production line, wherein the first production line comprises: - a first inlet conduit with a first end connectable to a source containing a starting confectionery mass, and a second end, - a first inlet pump connected in the first inlet conduit, - a first mixing and chilling chamber with an inlet opening for the confectionery mass, connected to the second end of the first inlet conduit, and an outlet opening for the ice cream output, - a first outlet conduit with a first end connected to the outlet opening of the first mixing and chilling chamber, and a second end, - a first outlet pump connected in the first outlet conduit, - a first cooling circuit in heat exchange connection with the first mixing and chilling chamber, - a second inlet conduit with a first end connectable to a source containing a starting confectionery mass, and a second end, - a second inlet pump connected in the second inlet conduit, - a second mixing and chilling chamber with an inlet opening for the confectionery mass, connected to the second end of the second inlet conduit, and an outlet opening, - a second outlet conduit with a first end connected to the outlet opening of the second mixing and chilling chamber, and a second end, - a second outlet pump connected in the second outlet conduit, - a second cooling circuit in heat exchange connection with the second mixing and chilling chamber, - with the auxiliary conduit in the disconnected configuration, the first and the second production line (3, 4) process confectionery mass flows independently of one another, and - with the auxiliary conduit in the connected configuration, the first and the second production line (3, 4) are placed in series and together process a single confectionery mass flow.