I have a fluval heater which came with my tank, it has a turing dial situated on the top of the unit, does any one know if the whole unit can be under water or does the dial at the top have to be out of the water,
Fluval Tronic heaters are submersible, but it isn't clear that that is what you have. Google "Fluval heater" and see if the photos you find match up with your heater.
hi i have just found out my name of the heater its called fluval tronic electronic aquarium heater 150w any ideas if the whole thing can go under water