It could be attached to a separate tank... but you would still have a supplier; and possibly get some discount pricing for the extra.
The mini-splits as far as I can tell do not supply domestic hot water... so it is a matter of how many different systems to install.
A thermal solar sized to produce just enough domestic hot water in the summer would more likely need a back-up in the winter.
One sized to produce more than enough in the winter will have too much capacity in the summer.
Just so many factors for everyone to think about with additional capital costs, suppliers, and such.
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