Most warming drawers are regulated by a thermostat.
Can you use a warming drawer on shabbos.
No adjustment to the temperature is permitted on shabbos even in the sabbath mode.
However the knob must be covered over.
If the food is solid and fully cooked and if the apparatus is such that it is not possible to use it for cooking in an effective manner then some iggros moshe vol.
Ten minute halacha warming drawers on shabbos.
In recent years two new methods were suggested for warming food on shabbos the k deirah blech and hot plates warming drawers as follows.
Warming drawers on shabbos.
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Just like you wouldn t put food into an oven to warm it up on shabbos you may not put food in a warming drawer on shabbos.
However if the warmer drawer is adjustable or it could reach temperatures of 275 degrees it is certainly forbidden.
No food cooked or non cooked may be placed in the oven on shabbos to re warm or cook.
As discussed earlier one may not put food into a warming drawer on shabbos.
By keeping food in the drawer you are showing that you want this extra heat to be generated.
And similarly as with ovens you must also cover your warming drawer controls if you are leaving it on over shabbos and not change the setting.
The second problem is that perhaps one will adjust the temperature setting on shabbat.
I have learnt that with almost all warming drawers when they are opened cool air goes in and the drawer will then need to bring the temp back up to the set temperature.
34 permit its use for heating food on shabbos provided the food is fully cooked and solid.
K deirah blech the k deirah blech is a rectangular covered shallow pan which is filled with water and placed before shabbos over the stovetop.
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Wouldn t it then be a problem to open a warming drawer on shabbos.