As discussed earlier one may not put food into a warming drawer on shabbos.
Can you use a warming drawer on shabbos.
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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However the knob must be covered over.
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.
Warming drawers on shabbos.
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.
No adjustment to the temperature is permitted on shabbos even in the sabbath mode.
In recent years two new methods were suggested for warming food on shabbos the k deirah blech and hot plates warming drawers as follows.
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.
No food cooked or non cooked may be placed in the oven on shabbos to re warm or cook.
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.
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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.
By keeping food in the drawer you are showing that you want this extra heat to be generated.
However if the warmer drawer is adjustable or it could reach temperatures of 275 degrees it is certainly forbidden.
Most warming drawers are regulated by a thermostat.
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.
Wouldn t it then be a problem to open a warming drawer on shabbos.