heater all the way underwater

i have a backup heater in my sump which is set slightly lower than my main one just incase my main one were to fail. i want to completely submerge this heater, even the part where the control dial is. the heater says "minimum water line on it". this says to me that it is ok to put underwater completley, as long as water is at that line. all the heater says on it is all glass aquariums i believe it came with a 55 gallon kit. i want it all the way underwater as water evaporates and drops in my sump and i dont want the heater kicking on if it is exposed to air temperature

 

Every heater I have ever seen, has been made to be completely submerged underwater, so you would most likely be fine in keeping it completely below the water/

 

Do you have a model # .. Some are meant to be underwater some are not..

Though most that are NOT are pretty obvious that they aren't ie. The lil hang on lip to secure it to the tank frame.

 

Some heaters can be fully submerged....others cannot. Look up the brand and model number and Google for it.

 

ill just do it. i googled aquarium heater minumum water level. heaters that can be completley submerged have a "minumum" water line in which water has to be at least that high. non submersible heaters will say "maximum" water line in which it isnt safe to have water above that mark

 

stupidity on my part. all i had to do was turn the heater around and read the fully submerible lable.