I built a 2000 watt heatstick to help out with stovetop brewing. They are pretty cheap, and easy to put together. There are lots of build threads here if you search for them. If you go with a 2000 watt element just be sure you have a 20 amp circuit, if you only have 15 amps a 1500 watt element would be about as big as you would want. And make sure you have it plugged into a GFCI outlet, it's not worth getting electrocuted over.
Mine works real well for brewing on the stove, and lately I have been using it to heat my strike and sparge water. I even use it along with my propane burner, it really cuts down on the amount of gas used, the burner is basically just idling.