It's quite common in a lot of parts of the world, Australia, Canada, the UK.. there's a lot of videos on youtube about it. "Gash Slugg" in Australia has some
youtube tutorials about it if I recall. A lot of folks even use plastic buckets for it (and watching all the American Armchair "Experts" go apoplectic about it if you dare mention it is quite fun- there are threads on here about it.)
The only issue, and I talked to Gash about it is that in Australia and the UK their home elements are 220, and ours in the US is 110... so we're not sure if 2 tea elements are enough to do the job here. Although we both assume the principle is the same.. if two elements can work there, we don't see why 2 elements made to boil water with 110 wouldn't work.... But I haven't done the electrical math on it.
I haven't gotten around to trying it yet. (I've been contemplating doing an all electric plastic bucket kettle setup for winter indoor brewing for a couple of years now.)
Here's a video on Tea Kettle Plastic brewing, showing what people around the world are doing although American homebrewers are just SURE it can't/shouldn't be done. LOL
[ame]https://www.youtube.com/watch?v=9XBeJBStUqI[/ame]