Instead of using a space heater, I’m thinking about adding an exhaust vent fan with a heater. This will not only warm the bathroom, but also improve indoor-air quality by circulating the air and removing odors and contaminants. One fan that I’ve had my eye on is the WhisperWarm ventilation fan by Panasonic Home & Environment Company. It’s quiet, lightweight, compact, and comes with an optional light and nightlight that uses CFLs.
Looking for a simple, eco-exhaust fan that doesn't heat? Then check out the WhisperGreen Energy Star-rated fan. The WhisperGreen uses a super-efficient DC motor, and comes with variable 2-speed and delay timer controls built-in or as a single-speed fans. All WhisperGreen models exhaust fans comply with Green building IAQ standards.