Impeller for a water flow meter, water flow meter and continuous flow heater

摘要

Impeller (1) for a water flow meter about an axis (20) is rotatable and its rotational speed can be sensed,the impeller (1) is at least two working faces (10) has to be subjected to a water flow,characterized by the,that the at least two working faces (10) to the axis (20) of the impeller (1) are curved.