DEVICE FOR HEATING PROCESS WATER FOR A WATER-CARRYING HOUSEHOLD APPLIANCE FOR THE CARE OF LAUNDRY ITEMS, AND HOUSEHOLD APPLIANCE HAVING SUCH A DEVICE

A device for heating process water for a water-carrying household appliance is provided. The device stores thermal energy surrounding the device and transfers the thermal energy to the process water. The device is a latent heat energy store having a heat exchanger with a storage medium and a working medium. The storage medium stores the thermal energy and the temperature of a phase transition of the working medium is set between 20° C. and 22° C.