Reheating Using a Warming Tray

On Shabbat, you may not heat food, whether liquid or solid, on a warming tray that is 120° F--49° C--or more.  But if the tray is less than 120° F, it may be permissible. Ask a rabbi, since there may be other problems due to switching on or off the heating element, lights, etc.
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I just read this halacha, Reheating Using a Warming Tray, at www.practicalhalacha.com. I think you will find it very interesting.