A method for steam disinfection of the washing tank (2) and the hot water tank (4) of a dishwasher, as well as of the pipe connections (10, 26) between these tanks. The novel feature is that the steam required for the disinfection is produced by the heating element (22) located inside the hot water tank (4) upon this tank, by the end of the washing process, being drained to a suitable level (24). The steam is led by pipe connections (26) in the top of the tank to the washing tank (2) for disinfection thereof. Water is not supplied to the hot water tank during the disinfection process, as the top of the inlet pipe to the circulation pump (6) defines a certain minimum water level (24), by which there is enough water left for the production of the steam as required for the disinfection process, whereby dryboiling of the heating element (22) is prevented. Further, a dishwasher and a hot water tank for the use of the method are disclosed.
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