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Permissible ways to heat up food on Shabbat: Difference between revisions

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==General guidelines of Hachzara==
==General guidelines of Hachzara==
===Returning food to an uncovered fire===
===Returning food to an uncovered fire===
# There is a rabbinic prohibition not to return cooked food to a fire on [[Shabbat]] even if the food is fully. Some say that the reason for the prohibition is that it looks like cooking and some that it is because one may come to stoke the coals. <Ref>
# There is a rabbinic prohibition not to return cooked food to a fire on [[Shabbat]] even if the food is fully. Some say that the reason for the prohibition is that it looks like cooking and some that it is because one may come to stoke the coals. <Ref>  
* The Mishnah (Shabbat 36b) records Beit Hillel’s opinion that one may not return a pot to a Kirah (type of stove meant to hold two pots) on Shabbat if the Kirah is heated with pressed sesame or wood unless the coals were covered with ashes or removed.  
* The Mishnah (Shabbat 36b) records Beit Hillel’s opinion that one may not return a pot to a Kirah (type of stove meant to hold two pots) on Shabbat if the Kirah is heated with pressed sesame or wood unless the coals were covered with ashes or removed.  
* Rashi Shabbat 36b "lo machzirim" says its "mechzay kimivashel", meaning, that the reason Chazal prohibited placing fully cooked food on the fire on Shabbat is that it looks like one is cooking on Shabbat. Baal HaMoar 16b, Rashba (38b D”H MeKlal) in name of some geonim, Ritva (40b D”H VeAskina), and Ran (17b D”H Bei Rav Ashi) write that the prohibition of Chazara is a gezerah of Chazal because it looks like cooking when one heats up cold food on [[Shabbat]]. Mishna Brurah 253:55 quotes this Ran.
* Rashi Shabbat 36b "lo machzirim" says its "mechzay kimivashel", meaning, that the reason Chazal prohibited placing fully cooked food on the fire on Shabbat is that it looks like one is cooking on Shabbat. Baal HaMoar 16b, Rashba (38b D”H MeKlal) in name of some geonim, Ritva (40b D”H VeAskina), and Ran (17b D”H Bei Rav Ashi) write that the prohibition of Hachzara is a gezerah of Chazal because it looks like cooking when one heats up cold food on [[Shabbat]]. Mishna Brurah 253:55 quotes this Ran.
* Rabbeinu Tam Sefer Hayashar 235 adds that Chazal prohibited it lest a person stoke the coals on Shabbat. Shaar HaTzion 235:37 quotes this opinion of the Rabbeinu Tam.  
* Rabbeinu Tam Sefer Hayashar 235 adds that Chazal prohibited it lest a person stoke the coals on Shabbat. Shaar HaTzion 235:37 quotes this opinion of the Rabbeinu Tam.  
* The Gemara and Rishonim discuss under what conditions may one return food to the fire. Based on the Rama 253:2, Shemirat Shabbat KeHilchata 1:18 rules that one may return food to a fire on Shabbat only under the following conditions: 1) the food is fully cooked, 2) it’s still somewhat hot (see note 4), 3) it was removed with intent be to returned, 4) one kept his hand on it, and 5) the fire is covered. For the slightly variant conditions according to Sephardim, see Yalkut Yosef 253:9.</ref>
* The Gemara and Rishonim discuss under what conditions may one return food to the fire. Based on the Rama 253:2, Shemirat Shabbat KeHilchata 1:18 rules that one may return food to a fire on Shabbat only under the following conditions: 1) the food is fully cooked, 2) it’s still somewhat hot (see note 4), 3) it was removed with intent be to returned, 4) one kept his hand on it, and 5) the fire is covered. For the slightly variant conditions according to Sephardim, see Yalkut Yosef 253:9.</ref>
# One may not return food to the oven on [[Shabbat]] even if the food is fully cooked and is very hot since an oven is considered an uncovered flame, chazara is forbidden. <Ref>Shemirat Shabbat KeHilchata 1:17 </ref>
# One may not return food to the oven on [[Shabbat]] even if the food is fully cooked and is very hot since an oven is considered an uncovered flame, Hachzara is forbidden. <Ref>Shemirat Shabbat KeHilchata 1:17 </ref>
# If there’s a metal box insert in the oven, some consider the fire to be a covered one. <Ref> Sh”t Igrot Moshe 4:74:27 permits returning food to an oven on [[Shabbat]] if the oven has a metal insert of 4 sides to serve as a reminder. However, Sh”t Shevet HaLevi 3:48 argues on Igrot Moshe and holds that under all circumstances it’s forbidden to return food to the inside of an oven. </ref>
# If there’s a metal box insert in the oven, some consider the fire to be a covered one. <Ref> Sh”t Igrot Moshe 4:74:27 permits returning food to an oven on [[Shabbat]] if the oven has a metal insert of 4 sides to serve as a reminder. However, Sh”t Shevet HaLevi 3:48 argues on Igrot Moshe and holds that under all circumstances it’s forbidden to return food to the inside of an oven. </ref>
===Moving pots around on top of a fire===
===Moving pots around on top of a fire===
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# A pot was on the edge of the blech (not above the fire) may be moved to the center of the blech (above the fire) as long as the area where the pot was originally was as hot as 113 degrees and the food was fully cooked. <Ref> Shemirat Shabbat KeHilchata 1:22 </ref>
# A pot was on the edge of the blech (not above the fire) may be moved to the center of the blech (above the fire) as long as the area where the pot was originally was as hot as 113 degrees and the food was fully cooked. <Ref> Shemirat Shabbat KeHilchata 1:22 </ref>


==Conditions to permit Chazara==
==Conditions to permit Hachzara==
# Someone who takes food off the fire on [[Shabbat]] may return it under the following conditions:  
# Someone who takes food off the fire on [[Shabbat]] may return it under the following conditions:  
*1) the food is fully cooked  <ref> S”A 318:4 and Rama 253:2 rule like the Rambam and Tur who hold that unless foods are fully cooked one would violate Bishul Deoritta, against the Rosh ([[Shabbat]] 3:10-11) and Rashba ([[Shabbat]] 18b) who hold that once food is cooked KeMachal Ben Dursai it’s permissible to cook it even until it’s fully cooked food. Therefore, one may not return to the fire any food that’s not fully cooked otherwise there’s a potential Deoritta violation of bishul. Accordingly, Biur Halacha 318:4 D”H Shayach writes that even if one is in doubt whether the food is fully cooked or not one may not return the food to the fire. So brings Shemirat Shabbat KeHilchata 1:18 note 55. </ref>
*1) the food is fully cooked  <ref> S”A 318:4 and Rama 253:2 rule like the Rambam and Tur who hold that unless foods are fully cooked one would violate Bishul Deoritta, against the Rosh ([[Shabbat]] 3:10-11) and Rashba ([[Shabbat]] 18b) who hold that once food is cooked KeMachal Ben Dursai it’s permissible to cook it even until it’s fully cooked food. Therefore, one may not return to the fire any food that’s not fully cooked otherwise there’s a potential Deoritta violation of bishul. Accordingly, Biur Halacha 318:4 D”H Shayach writes that even if one is in doubt whether the food is fully cooked or not one may not return the food to the fire. So brings Shemirat Shabbat KeHilchata 1:18 note 55. </ref>
*2) the fire must be covered <ref> S”A 253:2 writes that one may return hot food if the fire is Garuf or Katum. Mishna Brurah 253:81 adds that a similar metal try can be used as a cover of the fire to separate the fir from the pot. Similarly, S”A 253:3 writes that if on [[Shabbat]] morning one finds the food in one’s pot burning, one may remove it from the fire, put an empty pot on the fire and then the pot with food in it on top of the empty pot. Mishna Brurah 253:81 comments that it’s permissible to put the pot back on the fire since there’s an empty pot on the fire making it like Garuf or Katum. Kaf HaChaim 253:11, Sh”t Maharshag 2:50, Sh”t Igrot Moshe 1:93, and Shemirat Shabbat KeHilchata 1:18 rule that the fire must be covered in order to do chazara (Shemirat Shabbat KeHilchata (1 note 54 quotes Rabbi Shlomo Zalman as saying that one shouldn’t increase the flame when one puts a cover on top of it). Many poskim including Mishna Brurah 318:91, Shemirat Shabbat KeHilchata (chapter 1 note 59) in name of Rav Shlomo Zalman, and Sh”t Igrot Moshe 1:93 rule that one may cover the fire on [[Shabbat]] even if the pot is metal against Chazon Ish 37:11 who forbids putting metal on fire where it’ll become 113 degrees. </ref>
*2) the fire must be covered <ref> S”A 253:2 writes that one may return hot food if the fire is Garuf or Katum. Mishna Brurah 253:81 adds that a similar metal try can be used as a cover of the fire to separate the fir from the pot. Similarly, S”A 253:3 writes that if on [[Shabbat]] morning one finds the food in one’s pot burning, one may remove it from the fire, put an empty pot on the fire and then the pot with food in it on top of the empty pot. Mishna Brurah 253:81 comments that it’s permissible to put the pot back on the fire since there’s an empty pot on the fire making it like Garuf or Katum. Kaf HaChaim 253:11, Sh”t Maharshag 2:50, Sh”t Igrot Moshe 1:93, and Shemirat Shabbat KeHilchata 1:18 rule that the fire must be covered in order to do Hachzara (Shemirat Shabbat KeHilchata (1 note 54 quotes Rabbi Shlomo Zalman as saying that one shouldn’t increase the flame when one puts a cover on top of it). Many poskim including Mishna Brurah 318:91, Shemirat Shabbat KeHilchata (chapter 1 note 59) in name of Rav Shlomo Zalman, and Sh”t Igrot Moshe 1:93 rule that one may cover the fire on [[Shabbat]] even if the pot is metal against Chazon Ish 37:11 who forbids putting metal on fire where it’ll become 113 degrees. </ref>
*3) at the time it was removed from the fire, one intends to put it back <ref> Rama 253:2 in name of the Tur rules that one must have intention to return the food to the fire when one takes it off. So rules Shemirat Shabbat KeHilchata 1:18. Mishna Brurah 253:56 writes that if one still has the food in one’s hand but didn’t intend to return it to fire, one can be lenient in cases of need. </ref>
*3) at the time it was removed from the fire, one intends to put it back <ref> Rama 253:2 in name of the Tur rules that one must have intention to return the food to the fire when one takes it off. So rules Shemirat Shabbat KeHilchata 1:18. Mishna Brurah 253:56 writes that if one still has the food in one’s hand but didn’t intend to return it to fire, one can be lenient in cases of need. </ref>
*4) According to Ashkenazim, the pot must remain in one’s hand or in one’s hand while resting on a table or ground, however according to Sephardim, as long as the pot wasn’t placed on the ground, one may return it. <ref> Rama 253:2 writes that one of the conditions of chazara is that one keeps the pot in one’s hand. Mishna Brurah 253:55 writes that it’s forbidden to return the pot even if one put it down on a table or bench. The Shemirat Shabbat KeHilchata 1:18 writes that if one keeps one hand on the pot as one rests in on a table one may return the pot to the covered fire. So rules the Torat [[Shabbat]] 253:11, Demesk Eliezer 253:11, Sh”t Igrot Moshe 4:74:33, and the 39 Melachot (vol 2 pg 619, by Rabbi Ribiat) rule that as one as one keeps one’s hand on the pot even if the pot was rested on a table or bench one may return the pot. [However, from the Biur Halacha 253:2 D”H Velo it seems not like this.] On the other hand, S”A 253:2 writes that one of the conditions is to make sure not to place the pot on the ground. Magan Avraham 253:20 writes that the S”A argues on the Rama and permits leaving it on a table or bench if one intends to return it to the fire. So rules Yalkut Yosef ([[Shabbat]] vol 1 pg 103) that there’s no requirement to have the food in hand. </ref>
*4) According to Ashkenazim, the pot must remain in one’s hand or in one’s hand while resting on a table or ground, however according to Sephardim, as long as the pot wasn’t placed on the ground, one may return it. <ref> Rama 253:2 writes that one of the conditions of Hachzara is that one keeps the pot in one’s hand. Mishna Brurah 253:55 writes that it’s forbidden to return the pot even if one put it down on a table or bench. The Shemirat Shabbat KeHilchata 1:18 writes that if one keeps one hand on the pot as one rests in on a table one may return the pot to the covered fire. So rules the Torat [[Shabbat]] 253:11, Demesk Eliezer 253:11, Sh”t Igrot Moshe 4:74:33, and the 39 Melachot (vol 2 pg 619, by Rabbi Ribiat) rule that as one as one keeps one’s hand on the pot even if the pot was rested on a table or bench one may return the pot. [However, from the Biur Halacha 253:2 D”H Velo it seems not like this.] On the other hand, S”A 253:2 writes that one of the conditions is to make sure not to place the pot on the ground. Magan Avraham 253:20 writes that the S”A argues on the Rama and permits leaving it on a table or bench if one intends to return it to the fire. So rules Yalkut Yosef ([[Shabbat]] vol 1 pg 103) that there’s no requirement to have the food in hand. </ref>
*5) According to Ashkenazim, the food (liquid and solid) should be slightly warm in order to return it to the fire, however some argue that solids don’t need to be warm at all. On the other hand, according to Sephardim, the liquids must still be 113 degrees (and solids can be cold). <ref> S”A 253:2 writes that a condition of chazara is that the food is still boiling meaning that it’s 113 degrees. This condition is referring specifically to liquids as the Mishna Brurah 253:54 explains that this condition is dependant one of bishul and not chazara. Since S”A 318:4 rules that a liquid may not be heated up once it’s not 113 degrees, so too here a liquid may not be put back on the covered fire unless it’s 113 degrees. However, Rama 253:2 and 318:15 writes that Ashkenazim are lenient to allow returning a fully cooked liquid as long as it’s now slightly warm. So holds Mishna Brurah 253:54 and Shemirat Shabbat KeHilchata 1:18. Regarding solids, the Magan Avraham 253:36 writes that it also must be somewhat warm in order to return it to the fire. However, the Biur Halacha 253:5 D”H Ubilvad argues on the Magan Avraham based on the Buir HaGra. [It seems that Mishna Brurah 253:54, 91 rules like the Gra against the Magan Avraham even though he quotes the Magan Avraham (in 253:68).] The Shemirat Shabbat KeHilchata 1:18 seems to rule like the Magan Avraham however, it’s unclear what he holds based on the footnote. Yalkut Yosef ([[Shabbat]] vol 1 pg 103), and Menuchat Ahava (3:2, vol 1 pg 50) agree with the Biur Halacha that one may be lenient. </ref>
*5) According to Ashkenazim, the food (liquid and solid) should be slightly warm in order to return it to the fire, however some argue that solids don’t need to be warm at all. On the other hand, according to Sephardim, the liquids must still be 113 degrees (and solids can be cold). <ref> S”A 253:2 writes that a condition of Hachzara is that the food is still boiling meaning that it’s 113 degrees. This condition is referring specifically to liquids as the Mishna Brurah 253:54 explains that this condition is dependant one of bishul and not Hachzara. Since S”A 318:4 rules that a liquid may not be heated up once it’s not 113 degrees, so too here a liquid may not be put back on the covered fire unless it’s 113 degrees. However, Rama 253:2 and 318:15 writes that Ashkenazim are lenient to allow returning a fully cooked liquid as long as it’s now slightly warm. So holds Mishna Brurah 253:54 and Shemirat Shabbat KeHilchata 1:18. Regarding solids, the Magan Avraham 253:36 writes that it also must be somewhat warm in order to return it to the fire. However, the Biur Halacha 253:5 D”H Ubilvad argues on the Magan Avraham based on the Buir HaGra. [It seems that Mishna Brurah 253:54, 91 rules like the Gra against the Magan Avraham even though he quotes the Magan Avraham (in 253:68).] The Shemirat Shabbat KeHilchata 1:18 seems to rule like the Magan Avraham however, it’s unclear what he holds based on the footnote. Yalkut Yosef ([[Shabbat]] vol 1 pg 103), and Menuchat Ahava (3:2, vol 1 pg 50) agree with the Biur Halacha that one may be lenient. </ref>
===Clarification of the first requirement===
===Clarification of the first requirement===
# One may not return the inset of a crockpot to the base unless it was covered with aluminum foil (or the like) and it's preferable to cover the knob as well. <ref> Shabbat Kitchen pg 60 by Rabbi Simcha Bunim Cohen</ref>
# One may not return the inset of a crockpot to the base unless it was covered with aluminum foil (or the like) and it's preferable to cover the knob as well. <ref> Shabbat Kitchen pg 60 by Rabbi Simcha Bunim Cohen</ref>
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==Returning food to non-typical heating elements==
==Returning food to non-typical heating elements==
===Covered fire (Blech) ===
===Covered fire (Blech) ===
# On [[Shabbat]] some poskim permit one to cover the fire with a metal tray if the flame isn’t strong enough to make the tray red-hot. <Ref> Sh”t Zera Emet 3:26 permits one to put a metal tray (with small holes) on a fire on [[Shabbat]] and then do Chazara based on S”A 318:8 where he brings the dispute whether one can do Chazara on an empty over the fire and rules like the lenient opinion. Chazon Ish 37:11 argues that actually placing the metal sheet on the fire is the forbidden act of [[Mavir]] based on Rambam ([[Shabbat]] 12:1, 9:6) who says that one who heats metal to mold it violates [[Mavir]]. Even though S”A 253:3 writes that on [[Shabbat]] day one can put a empty pot on a fire (and then return a pot that was on the fire right before), Chazon Ish explains that S”A is talking about a earthenware pot and not metal. However Nishmat Adam 20:1, Kesot HaShulchan (134 pg 42), Sh”t Shevet Halevi 1:91, Sh”t She’ilat Shaul 29, Chazon Ovadyah ([[Shabbat]] 1 pg 55), and Sh”t Tefilah LeMoshe 1:59 (pg 647) argue that in our case the tray won’t become hot as a coal or hot enough to be reshaped and so it should be permitted. So rules Shemirat Shabbat KeHilchata 1:38 to permit covering the fire as long as the fire isn’t strong enough to make the tray red-hot. </ref>
# On [[Shabbat]] some poskim permit one to cover the fire with a metal tray if the flame isn’t strong enough to make the tray red-hot. <Ref> Sh”t Zera Emet 3:26 permits one to put a metal tray (with small holes) on a fire on [[Shabbat]] and then do Hachzara based on S”A 318:8 where he brings the dispute whether one can do Hachzara on an empty over the fire and rules like the lenient opinion. Chazon Ish 37:11 argues that actually placing the metal sheet on the fire is the forbidden act of [[Mavir]] based on Rambam ([[Shabbat]] 12:1, 9:6) who says that one who heats metal to mold it violates [[Mavir]]. Even though S”A 253:3 writes that on [[Shabbat]] day one can put a empty pot on a fire (and then return a pot that was on the fire right before), Chazon Ish explains that S”A is talking about a earthenware pot and not metal. However Nishmat Adam 20:1, Kesot HaShulchan (134 pg 42), Sh”t Shevet Halevi 1:91, Sh”t She’ilat Shaul 29, Chazon Ovadyah ([[Shabbat]] 1 pg 55), and Sh”t Tefilah LeMoshe 1:59 (pg 647) argue that in our case the tray won’t become hot as a coal or hot enough to be reshaped and so it should be permitted. So rules Shemirat Shabbat KeHilchata 1:38 to permit covering the fire as long as the fire isn’t strong enough to make the tray red-hot. </ref>
'''According to Ashkenazim'''
'''According to Ashkenazim'''
# It’s forbidden to place a pot of fully cooked food on a blech (a metal tray covering the fire) even if one’s intent is just to remove it’s chill. <Ref> Shemirat Shabbat KeHilchata 1:25, Sh”t Igrot Moshe 1:94, Shabbat Kitchen (pg 44), 39 Melachos (vol 2 pg 564) </ref> However, many permit placing fully cooked food on a blech on the area where it doesn’t reach 113 degrees. <Ref> Shabbat Kitchen pg 44, Igrot Moshe 1:94. However, Az Nidabru 8 forbids even in an area where the blech will not reach Yad Solet Bo. </ref>  
# It’s forbidden to place a pot of fully cooked food on a blech (a metal tray covering the fire) even if one’s intent is just to remove it’s chill. <Ref> Shemirat Shabbat KeHilchata 1:25, Sh”t Igrot Moshe 1:94, Shabbat Kitchen (pg 44), 39 Melachos (vol 2 pg 564) </ref> However, many permit placing fully cooked food on a blech on the area where it doesn’t reach 113 degrees. <Ref> Shabbat Kitchen pg 44, Igrot Moshe 1:94. However, Az Nidabru 8 forbids even in an area where the blech will not reach Yad Solet Bo. </ref>  
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# One may move pots from a cooler area to a warmer position on the blech only if the food is fully cooked and the area from which it stood originally was 113 degrees. <Ref>Shemirat Shabbat KeHilchata 1:25 </ref>
# One may move pots from a cooler area to a warmer position on the blech only if the food is fully cooked and the area from which it stood originally was 113 degrees. <Ref>Shemirat Shabbat KeHilchata 1:25 </ref>
'''According to Sephardim'''
'''According to Sephardim'''
# According to Sephardim, it’s permissible to put a solid (completely) cooked food on top of a blech or hotplate on [[Shabbat]]. <ref> [http://www.dailyhalacha.com/displayRead.asp?readID=429 Rabbi Mansour on Dailyhalacha.com], Yalkut Yosef ([[Shabbat]] vol 3 pg 207) </ref> However, it is forbidden to put a cooked liquid on a blech or hotplate on [[Shabbat]] unless one fulfills the conditions of Chazara, however it is permissible to ask a non-Jew to put a cooked liquid on top of a blech or hotplate on [[Shabbat]]. <ref> [http://www.dailyhalacha.com/displayRead.asp?readID=429 Rabbi Mansour on Dailyhalacha.com], Yalkut Yosef ([[Shabbat]] vol 3 pg 207) </ref>  
# According to Sephardim, it’s permissible to put a solid (completely) cooked food on top of a blech or hotplate on [[Shabbat]]. <ref> [http://www.dailyhalacha.com/displayRead.asp?readID=429 Rabbi Mansour on Dailyhalacha.com], Yalkut Yosef ([[Shabbat]] vol 3 pg 207) </ref> However, it is forbidden to put a cooked liquid on a blech or hotplate on [[Shabbat]] unless one fulfills the conditions of Hachzara, however it is permissible to ask a non-Jew to put a cooked liquid on top of a blech or hotplate on [[Shabbat]]. <ref> [http://www.dailyhalacha.com/displayRead.asp?readID=429 Rabbi Mansour on Dailyhalacha.com], Yalkut Yosef ([[Shabbat]] vol 3 pg 207) </ref>  
===Kedierah Blech===
===Kedierah Blech===
# One may place cold fully cooked solid food on top of a pot that is on the fire on Shabbat because that is not considered on top of a fire at all.<Ref>
# One may place cold fully cooked solid food on top of a pot that is on the fire on Shabbat because that is not considered on top of a fire at all.<Ref>
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# Many authorities permit placing food on an electric hotplate which does not have an adjustable temperature setting, even without fulfilling the conditions of Hachzara, since it is not a usual way of cooking. However, others say that it is considered like a covered fire, upon which one may not return food without fulfilling the conditions of Hachzara. <Ref>  
# Many authorities permit placing food on an electric hotplate which does not have an adjustable temperature setting, even without fulfilling the conditions of Hachzara, since it is not a usual way of cooking. However, others say that it is considered like a covered fire, upon which one may not return food without fulfilling the conditions of Hachzara. <Ref>  
* Rav Mordechai Willig (Am Mordecahi p. 48) writes that one may heat up cold fully cooked solid food on an electric hotplate which is not used for cooking and has only one temperature setting. Halachos of Shabbos (p. 313), Shabbos Kitchen (p. 43), and Chazon Ovadyah (p. 78) agree. See Sh”t Igrot Moshe 4:74:35 who rules that if it is impossible cook on a particular electric hotplate, one may heat up already warm food on it if it has only one setting. Shemirat Shabbat KeHilchata 1:30, however, rules that an electric hot plate is a like a covered fire and one may not return food onto it without fulfilling the other conditions of Hachzara. Rabbi Belsky (quoted by Halachically Speaking 4:16:3) and Orchot Shabbat (p. 99) agree.  
* Rav Mordechai Willig (Am Mordecahi p. 48) writes that one may heat up cold fully cooked solid food on an electric hotplate which is not used for cooking and has only one temperature setting. Halachos of Shabbos (p. 313), Shabbos Kitchen (p. 43), and Chazon Ovadyah (p. 78) agree. See Sh”t Igrot Moshe 4:74:35 who rules that if it is impossible cook on a particular electric hotplate, one may heat up already warm food on it if it has only one setting. Shemirat Shabbat KeHilchata 1:30, however, rules that an electric hot plate is a like a covered fire and one may not return food onto it without fulfilling the other conditions of Hachzara. Rabbi Belsky (quoted by Halachically Speaking 4:16:3) and Orchot Shabbat (p. 99) agree.  
* Chazon Ovadyah ([[Shabbat]] 1 pg 55) holds that since Chazara is only forbidden as it looks like cooking a plaata (electric hotplate) which isn’t used for cooking should be permitted for Chazara. Rav Frankel (Kol Torah (Iyar 5723, Sh”t Har Tzvi O”C 136, Toldot Zev ([[Shabbat]] 2 pg 234)) concurs. Sh”t Igrot Moshe (O”C 4:74(35), 1:93) permits Chazara on a blech if the food is fully cooked because it’s not used to cook and being a blech for [[Shabbat]] it serves as a reminder it’s [[Shabbat]]. Sh”t Yashkil LeAvdi O”C 7:28, Rav Shlomo Zalman Aurbach (Shulchan Shlomo 253:27), Sh”t Tzitz Eliezer 8:26, Chukei Chaim Peretz 8 in name of Rav Sheinberg, Sh”t Me’oneh Lashon 22, Sh”t Shemesh UMagen (3:54(3) in retraction of his stringent opinion in 1:53), Sh”t Tefilah LeMoshe 1:32, and Yitzchak Yiranen (pg 50) concur to permit Chazara on a plaata. However, Yashiv Moshe (Rabbi Twersky pg 36) in name of Rav Elyashiv and Sh”t Avnei Yishfeh 1:83 are strict because a plaata is sometimes used to cook. </ref>
* Chazon Ovadyah ([[Shabbat]] 1 pg 55) holds that since Hachzara is only forbidden as it looks like cooking a plaata (electric hotplate) which isn’t used for cooking should be permitted for Hachzara. Rav Frankel (Kol Torah (Iyar 5723, Sh”t Har Tzvi O”C 136, Toldot Zev ([[Shabbat]] 2 pg 234)) concurs. Sh”t Igrot Moshe (O”C 4:74(35), 1:93) permits Hachzara on a blech if the food is fully cooked because it’s not used to cook and being a blech for [[Shabbat]] it serves as a reminder it’s [[Shabbat]]. Sh”t Yashkil LeAvdi O”C 7:28, Rav Shlomo Zalman Aurbach (Shulchan Shlomo 253:27), Sh”t Tzitz Eliezer 8:26, Chukei Chaim Peretz 8 in name of Rav Sheinberg, Sh”t Me’oneh Lashon 22, Sh”t Shemesh UMagen (3:54(3) in retraction of his stringent opinion in 1:53), Sh”t Tefilah LeMoshe 1:32, and Yitzchak Yiranen (pg 50) concur to permit Hachzara on a plaata. However, Yashiv Moshe (Rabbi Twersky pg 36) in name of Rav Elyashiv and Sh”t Avnei Yishfeh 1:83 are strict because a plaata is sometimes used to cook. </ref>
===Crock-pot===
===Crock-pot===
# Some say that one may leave fully cooked food in a crock-pot which is on a timer (set from before [[Shabbat]]) to turn on [[Shabbat]] morning and off [[Shabbat]] afternoon, however, some question this. <ref>[http://www.ou.org/webcast_kosher Rabbi Hershel Schachter] (OU Kosher Webcast, min 13-16) says that even though the Shemirat [[Shabbat]] Kehilchata is lenient there is room to be strict because the Chazon Ish had a doubt about this. </ref>
# Some say that one may leave fully cooked food in a crock-pot which is on a timer (set from before [[Shabbat]]) to turn on [[Shabbat]] morning and off [[Shabbat]] afternoon, however, some question this. <ref>[http://www.ou.org/webcast_kosher Rabbi Hershel Schachter] (OU Kosher Webcast, min 13-16) says that even though the Shemirat [[Shabbat]] Kehilchata is lenient there is room to be strict because the Chazon Ish had a doubt about this. </ref>