Thank you Daox,
As far as I am informed controllers will handle this in two ways: discharge an excess hot water from the storage tank and import a new cold one from the mains water pipe.
And during the night, it will send the water from the tank to collectors, so that it could be cooled down.
What confuses me is what is happening during a day, when controller is set to "vacation"? It will simply just loop the water (turn on the pumps), like on any working day (day when there is a hot water consumption) through the swh system? And that is it? It will loop the water (in order to prevent the stagnation), even though there is no hot water consumption (family is on vacation)?
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