Answers:
water in, water out.
or, more to the point: cool dampen + sunlight in, warm water out.
Of course, if it is more complex than simply black plastic pipe(s), it may include electricity contained by, and some electronic valves to recirculate (reheat) the water a few times before outputing it.
Water heat going in
Water temperature going out
More complex
Energy contained in dampen in
Energy contained in water out
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