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The downside of a crockpot is two-fold. One, it will take a long time heat up. Two, a crock pot would be energy inefficient for heating a towel as you would be heating the entire crock, which also...

How about a folded towel inserted into the steamer insert of a rice cooker? If you put in just a small amount of water, it won't take much energy to boil it and then it will switch over to the warm...