I built two heatsticks this weekend, 1500w and 2000w. I haven't brewed with them yet, but I tested them in water. These are pretty great.
For 7gal of water in an 8gal aluminum pot, it took 53min to bring to a boil from 70degF, and 23' to boil from ~155degF. After boiling I shut off the 1500w...