The invention relates to a tank insert module (1) for extracting liquid from a vehicle tank, comprising a basic body (2) composed of a plastic, on which basic body are arranged a liquid extraction device (23), which comprises an extraction opening (4) which can be assigned to the tank interior space, and at least one electric heating element (7), wherein the electric heating element (7) comprises a heating body (8) with an extrusion-coated plastic encapsulation (9). It is provided here that the plastic encapsulation (9) has a plastic which can be welded to the basic body, in particular high-density polyethylene, and/or the same plastic as the basic body (2), and also at least one filler material with high thermal conductivity, and is welded to the basic body (2) at at least one contact point (17). The invention also relates to a liquid tank for vehicles.