Heater (1) for a motor vehicle, in particular a PTC heater, wherein the heater (1) comprises a supply conductor (3) and a controller board (4), wherein the supply conductor (3) can connect the heater(1) to a current source via the controller board (4), wherein the heater (1) incorporates a current measuring arrangement (10) with a current measuring sensor, and wherein the current measuring sensoris a Hall effect sensor (11).