Heating Liquids on Shabbat

You may not heat liquids by any method on Shabbat.  You may put a hot water urn on a timer from before Shabbat, but you may not add any water to the urn once Shabbat has begun.
 
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I just read this halacha, Heating Liquids on Shabbat, at www.practicalhalacha.com. I think you will find it very interesting.