A dosing module (24) for an emissions abatement system (10), the dosing module (24) including an armature (46), means (50) for moving the armature (46) and a valve body (42) having an outlet (71); the dosing module (24) having an unblocked condition, in which the armature (46) is moveable between a first position, in which the outlet (71) is closed by the armature (46), and a second position, in which the armature (46) is spaced apart from the outlet (71), and wherein, in use, application of electricity to the means (50) for moving the armature (46) at a first level of energy causes the armature to move from the first position to the second position; the dosing module (24) further having a blocked (by urea crystallisation) condition, in which flow of a liquid through the outlet (71) is prevented, wherein, in use, application of electricity to the means (50) for moving the armature (46) at a second level of energy causes the dosing module to change to the unblocked condition by melting the urea crystals to a temperature of at least 100°C. The heating device can be the solenoid coil of the actuator or a separate heating coil.