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I've heard that there is a dispute among poskim if one is allowed to use such an urn on Shabbos enter image description here (also here) as the outside water tube gets cold over Shabbos. Both sides agree that "Yesh bishul achar bishul" (there is cooking after cooking).

What is the argument? It seems to be a machlokes b'mtzius (an argument over a fact).

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Are you talking about the particular urn, because there is a tube containing water that shows the fill level, or are you talking about any urn, because of concern that some water might be left in the spout? – Seth J Jan 10 at 3:44
@SethJ the one that shows the water level. – Shmuel Brin Jan 10 at 3:45
Why does it matter that the outside water gets cold? You're allowed to cool water on Shabas. – msh210♦ Jan 10 at 5:06
@msh210 when it goes from there into the cup it will be re-cooked (and Yesh bishul achar bishul bedavar lach). – Shmuel Brin Jan 10 at 5:10
Ah, I didn't know it goes into the cup. Thanks for clarifying: you may wish to edit the clarification into the question. I'll delete this and my previous comment bl"n. – msh210♦ Jan 10 at 5:11
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As Rabbi Willig explained it, one factor would be whether or not we are concerned with heating more water already above yad soledet bo. Another is if this water's temperature is in fact below that (say this water is at 140 F...is that above or below). There may well be other factors. Tipping the urn backwards before Shabbat to ensure all water is pre-boiled seemingly does help, and was in fact his advice in this case.

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