These are really cheap and much faster because they are so much more efficient than burners. I use 2, one straight, one rightangled. You can still use a burner too.
http://www.cedarcreeknetworks.com/heatstick.htm
all the cautions it gives on the website about overloading your circuits with them, i think i'll pass. or i'll be outside brewing for sure if i burn my house down lol