In the summer on Shabbos, may one wash his hands using tab water that is warm due to the sun? There is no cold water coming out of the tab as even the cold water has become warm.
Yes, as the water was heated on its own without any human action. This likely applies even according to Admur. [There is no cooking prohibition being that the water is not Yad Soledes and even if it was, it would be Chama, or Toldos Chama]. It is not necessary to wait for the water to flow until cold water comes out, although one who does so is certainly doing an act of piety due to the prohibition against bathing in water heated on Shabbos even Biheter, which can be understood to apply even when no action was done to the water.
Sources: See Admur 326:4; Supplement from Mahadurah Basra chapter 259 Page 884 in the new Shulchan Aruch; M”B 326:17; Hagahos Rav Akiva Eiger on 326; Tehila Ledavid 326:3; Igros Moshe 1:126; Shevet Halevi 1:58; 3:33; SSH”K 14:3 and footnote 17; Shabbos Kehalacha 18:34 Biurim 5; Piskeiy Teshuvos 3261 and footnote 36
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