Electronic continuous-flow heater and method for operating such a heater

Abstract

An electronic continuous-flow heater for heating a liquid includes an electrically heatable heating channel arrangement with at least one electric heating element, an electronic control system including at least one microprocessor configured to electrically control the heating element, and a display device connected by means of the electronic control system. The display device is designed as a bistable digital display such that the display content remains visible even in the absence of the display supply voltage of the display device.

1 . An electronic continuous-flow heater for heating a liquid, comprising an electrically heatable heating channel arrangement with at least one electric heating element;
 an electronic control system, comprising at least one microprocessor, which is configured to electrically control the heating element;   a display device connected by means of the electronic control system, wherein the display device is designed as a bistable digital display, such that display content remains visible even in the absence of a display supply voltage of the display device.   
     
     
         2 . The continuous-flow heater according to  claim 1 , wherein a display surface of the display device is formed by an electronic paper. 
     
     
         3 . The continuous-flow heater according to  claim 1 , wherein the electronic control system has at least one electrical energy storage device for buffering an operating voltage of the electronic control system and the electronic control system has an undervoltage detection circuit for detecting an undervoltage of the mains and/or heating element voltage. 
     
     
         4 . The continuous-flow heater according to  claim 3 , wherein the electronic control system is configured to cause the display device to output an undervoltage message in the event that an undervoltage is detected by the undervoltage detection circuit. 
     
     
         5 . A method for operating an electronic continuous-flow heater for heating a liquid, wherein the continuous-flow heater comprises an electrically heatable heating channel arrangement with at least one electric heating element, an electronic control system comprising at least one microprocessor, and a display device connected by means of the electronic control system, the method comprising the step of:
 electrically controlling the at least one electric heating element by the electronic control system; and   controlling the display device, as a bistable digital display, by the electronic control system, such that the display content remains visible even in the absence of the display supply voltage of the display device.   
     
     
         6 . The method according to  claim 5 , further comprising:
 buffering of the operating voltage of the electronic control system by the electronic control system; and   detecting an undervoltage of the mains and/or heating element voltage by an undervoltage detection circuit of the electronic control system.   
     
     
         7 . The method according to  claim 6 , further comprising causing, by the electronic control system, the display device to output an undervoltage message in the event that an undervoltage is detected by the undervoltage detection circuit. 
     
     
         8 . The method according to  claim 5 , further comprising causing the control device to write a display content for identifying a technical test, which is carried out on the continuous-flow heater, on the display device at the factory before the continuous-flow heater is disconnected from the power supply after the test has been completed.