Quoting%20commentary for Shabbat 3:4

מַעֲשֶׂה שֶׁעָשׂוּ אַנְשֵׁי טְבֶרְיָא וְהֵבִיאוּ סִלּוֹן שֶׁל צוֹנֵן לְתוֹךְ אַמָּה שֶׁל חַמִּין. אָמְרוּ לָהֶן חֲכָמִים, אִם בְּשַׁבָּת, כְּחַמִּין שֶׁהוּחַמּוּ בְשַׁבָּת, אֲסוּרִין בִּרְחִיצָה וּבִשְׁתִיָּה בְּיוֹם טוֹב, כְּחַמִּין שֶׁהוּחַמּוּ בְיוֹם טוֹב, אֲסוּרִין בִּרְחִיצָה וּמֻתָּרִין בִּשְׁתִיָּה. מוּלְיָאר הַגָּרוּף, שׁוֹתִין הֵימֶנּוּ בְשַׁבָּת. אַנְטִיכִי, אַף עַל פִּי שֶׁגְּרוּפָה, אֵין שׁוֹתִין מִמֶּנָּה:

Once, the men of Tiberias placed a cold-water pipe into a hot-water conduit [coming from the hot springs of Tiberias, so that the cold water was heated by the hot.] The sages said to them: If on the Sabbath, as hot water heated on the Sabbath, [i.e., the status of the water flowing through that pipe on the Sabbath is that of hot water which was heated on the Sabbath], viz.: It is forbidden to wash in it [even a small limb] and it is [also] forbidden to drink it. [And the status of the water passing through it] on a festival is that of hot water which was heated on a festival. It is forbidden to wash [the entire body] in it, but it is permitted to wash one's face, hands, and feet in it], and it is permitted to drink it. [The halachah is in accordance with the sages. (The men of Tiberias did a turnabout and broke the pipe.)] One may drink from a scraped moliar on the Sabbath. [("moliar":) The gemara explains: Water inside, coals outside. It is a vessel with a small receptacle attached to its outside wall in which coals are put, and the water in the large receptacle. If it were scraped of coals while it was still day, it is permitted to drink of the water in the large receptacle on the Sabbath, even though it is warmed somewhat by the vessel. For it does not add heat, but only preserves it so that the contents not cool.] One may not drink from an antichi, even if it has been scraped. [The antichi is a copper vessel with two surfaces. The water is placed above, and the fire below, between the two surfaces, its heat thereby being long preserved. So that even if the coals are scraped out on Sabbath eve, the water is heated on the Sabbath, for which reason it is forbidden to drink from it on the Sabbath.]

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