Thanks a lot for the information guys! My Jetta does have the KESSY system and came with a factory block heater (is this the same as a circulating coolant heater?), I plan to use this in the morning leaving home but unsure what I will do leaving work (no plugs anywhere near my parking lot). I did read the links posted by JSTTDI09 (thanks again!) suppose i will just have to drive until it heats up..
Technically, if I am not mistaken, as I have the same car, the factory "block" heater is not actually block heater, it
is a circulating coolant heater.
The frostheater's or Zerostart heaters work amazing, and are usually 750, 1000, or 1500W.
The factory heaters in our cars I believe are 500W, but still work quite well from what I hear. Haven't tried mine yet.