Thanks all of you. As for myslelf, I am using Tectronic submersible heaters on my 10G and on my 30G. The reason I use this brand is because this is the only one at my
LFS (here we go again ... my wonderful LFS that has everything except what's most essential).
I've had these heaters for as long as I had my tanks running - meaning for about 1.5 - 2 years. I have to say they have been pretty accurate so far and they seem to be working great. However, they haven't broken YET, so what else can I say except the fact that they work. Perhaps they're going to break soon (their warranty is for only one year, so I am suspecting they could break at any time after one year). I am curious of their public opinion. Anybody heard any opinions on Tectronic submersibles?
I am considering buying 2 backup heaters as well (especially if Tectronic heaters have bad ratings). You never know, right?