Glad to see someone else interested in this. It's weird that there isnt more information on these things for homebrewing... Let me know how it goes for you. I think I may get the first link that you posted, the one with the circular ring around it. Do you know if that ring sits under the the top...
how very weird, I have been researching for about 9 months now about setting up an all grain system, but due to the cost and p.i.t.a. propane would be in the rainy NW I wanted to start off with electricity somehow. I finally find out today that they make stove top elements that go up to 2600w...