Method for determining degree of scaling of heater in tea or coffee maker, involves measuring time from thermostat switching heater off until it switches it back on after cooling and comparing with desired value

摘要

The method involves measuring the time from the thermostat switching the heater off until it switches it back on after cooling. This is compared with a desired value and a signal is produced if the time is shorter than the desired value. An independent claim is included for a device for carrying out the method.