Some designs have a ground circuit interrupter built into the end of the plug. Other bathroom models have a safety shutoff device if it gets wet. The heaters can be placed in either a horizontal or vertical position depending on where you need the most warm air. In the horizontal position, you can snap on a drying attachment for your children's damp shoes, gloves, hats, etc. Each has its preferred applications.
Radiant models are quiet and good for focusing the warmth.
Forced convection designs make some noise, but can warm a larger area. Natural convection units are quiet, yet provide even warmth. Do not just buy the cheapest model on sale. An audible tip-over alarm is also a plus. Update Bulletin No.