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It is normal for the cord on any heater to get warm after you are using it for awhile. If it gets so hot that it is uncomfortable to touch or the insulation becomes very soft, cracks, bubbles, or becomes brittle, you should stop using the heater. There may be a short in the cord, the wire inside may be partially broken in one or several spots, the cord might be cut, or the heater may be malfunctioning. For the price of these heaters it is advisable to simply replace one if it is malfunctioning. If you determine that the cord is At Fault and you want to replace it, be sure to use a quality 14 gauge or heavier cord and make sure you have adequate strain relief on the cord as it enters the heater. If you buy the cord and plug separately make sure the plug is rated for at least 1500 watts or 13 amps and the new plug has the same number of prongs.

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