Amazon The Dreo DR-HSH004A are the most effective and—more important—safe way to bring some infrared warmth to your bathroom. Although you should still try to keep your space heater far away from water, this model comes with an ALCI safety plug as well as overheat protection, for added safety in the case of stray splashes. In our tests, it did a great job of warming up the cold bathroom tile, too, and it even comes with a remote control so you can heat things up before you get out of bed. Whichever space heater you choose, there are some common safety concerns that many people overlook: You can’t use any space heater with an extension cord, and you shouldn’t leave any heater unattended. And most heaters can’t be used in a bathroom, unless they’re specifically designed for it. We go over these and other considerations in detail in our section on space-heater care, maintenance, and safety. Advertisement