They really need something to hold the plastic bottle up off the bottom, about 1/2", in a pot of water. Then, using a thermometer, do not let the water get over 140 deg, F, (unless they want to pasteurize it. Then, they would put a candy thermometer in the honey, and bring the honey to 145 deg. F., and hold it for 30 minutes.) Even on low, the water will normally get hotter than 140 deg F, so they will have to watch it, and keep moving it off the stove, until liguified.
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