Electrical heating device for a motor vehicle and vehicle and associated air-conditioning and/or heating unit

An electrical liquid heating device for a motor vehicle, the heating device comprising at least one first (7a) and one second (7b) module for heating the liquid and defining at least one liquid flow path (15) for guiding the liquid to be heated, wherein the heating modules (7a, 7b) each have an approximately cylindrical overall shape and are positioned side by side in an approximately parallel manner, wherein the heating modules (7a, 7b) each comprise a core (11) and a heating means (13) comprising heating elements which surrounding the core (11) so as to define one of the at least one liquid flow path (15) for guiding the liquid around the core (11), wherein each of the heating modules (7a, 7b) are received in an associated housing of the heater (5), wherein a longitudinal axis (A) disposed through a center of each of the heating modules (7a, 7b) are parallel such that the longitudinal axes (A) are not coincident and extensions of the longitudinal axes (A) do not meet, and wherein the core (11) includes a plurality of grooves (16) disposed on its external surface, wherein the core (11) of at least one heating module (7a, 7b) has at least one communication orifice (14) and an internal cavity (12) capable of communicating with the liquid flow path (15) through the at least one communication orifice (14) such that the liquid is able to flow between the heating means (13) and the core (11) from an inlet canal (23) to the communication orifice (14) where the liquid enters the internal cavity (12) before exiting the core (11).