Method for qualitative recognition of liquid flow, involves promoting liquid flow between two positions at different ambient temperature, and determining local temperature at two positions

摘要

The method involves promoting liquid flow between two positions at different ambient temperature, and determining the local temperature at the two positions by a temperature sensor. The measured temperatures are compared and signalize the equality of the temperatures to the stop the current. An independent claim is included for an instantaneous water heater, with which a liquid is promoted by a labyrinth.