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Winter assessment, behind window.
In perfect sunny weather it is still producing one batch of warm water. Not hot, and I don't think it's well suited for washing greasy dishes. But just for washing hands, or rinsing a cup or something, it works out.
In somewhat sunny weather, with thin layer of clouds, the Sun peeking out, it make the water about body temperature - when I reach out I don't feel it warmer or colder.