Opt for convection or radiant. Convection electric space heaters, whether fan-forced or not, are best for heating an entire room. Radiant electric space heaters use an electric-ribbon element or a quartz tube, and are ideal for spot heating. But that heat quickly dissipates when the unit is off.

Assess portability. If your electric space heater will see duty in many rooms, you'll want a model that's easy to move. Most electrics are lighter than kerosene or propane models. Still, the electric TaiChi and the DeLonghi SafeHeat Oil Filled TRD0715T, $70, weigh a hefty 26 pounds. Look for a handle that provides a safe grip.

Play it safe. Overloaded, undersized, or frayed power cords are a major cause of fires, injuries, and deaths associated with space heaters. Inspect your electric space heater's power cord to ensure it's in good condition. If you need to use an extension cord, get a 12- or 14-gauge model. All of the tested electric models have a power cord that's at least 70 inches long. A longer cord gives you greater flexibility in where you can place the heater.

Buy an electric space heater listed by Underwriters Laboratories, whose mark indicates it meets UL's voluntary safety standards. And consider a model with a tip-over switch and an automatic shutoff for overheat protection. Place your electric space heater at least 3 feet from furniture and window treatments and out of the reach of children or pets. And always turn off the heater when you go to bed or leave home.