I just purchased a new Jager heater from my LFS and it states on the box that it is a submersible heater. However it also has a "water level" line on it and it reads "Do not immerse beyond water level" just above the line. It also states in the directions that the water level must never be over the water level mark. I'm confused here...Is it fully submersible? Does anyone else see this on their heaters? My LFS sold it to me as a submersible heater and stated that they used them in their own tanks. Did I buy the wrong heater? :huh: