Abstract: The invention relates to a connecting device (10) for a windshield wiper system, comprising an integral housing (12) made of a plastic material, wherein the housing (12) has at least one inflow connection (14, 16) for the inflow of fluid, and at least one outflow connection (19) for the outflow of the fluid, wherein the inflow connection (14, 16) is connected in a fluid-conducting manner to the outflow connection (19) via at least one fluid line (22) formed in the housing (12). The connecting device (10) further comprises at least one valve (28) for separating the fluid-conducting connection, at least one electric heating means (32), which is provided for warming up the fluid line (22) and the valve (28), at least one power source power supply (38), and at least one consumer power supply (40), wherein the power source power supply (38) can be connected to a power source, and the consumer power supply (40) can be connected to an electrical consumer.