Lukewarm Water on a Hotplate Before Shabbat | Leaving food on a source of heat and insulation on Shabbos eve | Ask the Rabbi - SHEILOT.COM

Lukewarm Water on a Hotplate Before Shabbat

Question

Is it permitted to place lukewarm water on the hotplate before Shabbat so that it will heat up on Shabbat?

Answer

Shalom u’vrachah 

Strictly speaking, it is permitted. 

However, it is proper to boil the water before Shabbat. 

Source

See Shulchan Aruch, Orach Chaim, siman 253, se’if 2; and Mishnah Berurah, se’if katan 73. 

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