Reference for Shabbat 102:4

וכשם שאין טומנין את החמין כך אין טומנין את הצונן רבי התיר להטמין את הצונן

or a boiler upon a pot;<span class="x" onmousemove="('comment',' Var. lec.: and a pot upon a boiler, but not a boiler upon a pot. [The reason for the distinction is not clear and Rashi explains because a pot being of earthenware retains more effective heat which it communicates to the boiler of copper. Tosef. Shab. VI, however reads: and a pot upon a boiler and a boiler upon a pot. V. Asheri and Alfasi]. ');">⁴</span>

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