A process for manufacturing a beverage preparation machine by providing a group of components a) to f), with the components including a brewing unit for receiving an ingredient of the beverage and for guiding an incoming flow of liquid, through the ingredient to a beverage outlet; b) an in-line heater for heating the flow of liquid to be supplied to the brewing unit; c) a pump for pumping the liquid through the heater; d) one or more fluid connecting members for guiding the liquid from a source of liquid to the beverage outlet; e) an electric control unit for receiving instructions from a user via an interface and for controlling the heater and pump; and f) one or more electric sensors for sensing at least one operational characteristic of the brewing unit, the heater, the pump, a liquid reservoir, an ingredient collector, a flow of the liquid, a pressure of the liquid and a temperature of the liquid, and for communicating the characteristic(s) to the control unit. Components a) to f) for assembling the beverage machine are connected by pre-assembling at least two or three modules, with each module being fully automatically assembled from at least two of components a) to f), wherein the components of the fully automatically preassembled modules are configured to be automatically seizable, orientable, positionable and fully connectable to each other in one or more automatic assembly steps.