The heater only draws about 4-5 amps (500 watts) so you really do not need a heavy duty timer. Just about any timer yiou buy is rated for at least 10 amps. Make sure you read the package or the back of the timer.

I use the "Drape the cord around the star" method.

-Jim

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.