When you open the drawer to put the food inside you are going to cause the burner to go on and compensate for the heat loss that you created.
Can you use a warming drawer on shabbos.
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.
By keeping food in the drawer you are showing that you want this extra heat to be generated.
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But many rabbis hold that even a hotter drawer would be allowed as one does not ever cook in the drawer but only uses it for warming and as such there is no issue of appearing to cook when food is placed in it.
In recent years two new methods were suggested for warming food on shabbos the k deirah blech and hot plates warming drawers as follows.
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.
No food cooked or non cooked may be placed in the oven on shabbos to re warm or cook.
Wouldn t it then be a problem to open a warming drawer on shabbos.
Warming drawers on shabbos.
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.
No adjustment to the temperature is permitted on shabbos even in the sabbath mode.
However the knob must be covered over.
However if the warmer drawer is adjustable or it could reach temperatures of 275 degrees it is certainly forbidden.
The second problem is that perhaps one will adjust the temperature setting on shabbat.
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All food must be fully cooked and placed in the oven before shabbos.
Most warming drawers are regulated by a thermostat.
Ten minute halacha warming drawers on shabbos.
34 permit its use for heating food on shabbos provided the food is fully cooked and solid.