Expert opinions vary on whether it is advisable to use a comforter on top of your electric blanket. Modern electric blankets receive good marks for safety but some industry specialists advise users to check manufacturers' guidelines regarding their products' use with comforters.
The website ElectricBlanketInstitute states that most brands of heated blankets can be used with comforters. However the website of BedsForHome, a supplier of bedding products from multiple brands, recommends checking manufacturer guidelines. The latter site says, "Some suppliers may recommended removing other bedding materials when your electrical blanket is turned on."
Perfect Fit Industries, which manufactures electric blankets under a variety of brand names, states on its website that, "Any bedding you would normally use may be used with your warming product." Perfect Fit advises you not to use two warming blankets or mattress pads at the same time.
ElectricBlanketSafety offers more tips: Do not run the power cord for your blanket between the mattress and box spring. Do not let your electric blanket bunch up so that heat builds up in one spot. Never use it on a waterbed and use care with folding beds. Keep fluids, pins, needles, and pets away from your electric blanket.