Kherman, good idea about trying to stop it from touching the sides!
Jay, Yes the whole thing is big, but the tank it is going on is 250L, it would hang over the edge of the back of the tank. The canopy that is on the tank right now is 6-8" high so that would cover/hide the top portion of the contraption. It's silent running on a 5 gallon bucket, but there is a little surface movement even with the edge of the output under water 1/4"!
I don't care about getting wet, I just want the heater out of the tank!
I mentioned leaving the top of the cylinder open so I could adjust it easily with out having to take the whole thing apart.
Now if only I could figure out how to get no sureface movement I think it would be ok!