are u trying to cause a problem for urself? i dont think u examined ur heater very well... i have the same one its not fully submersable.. not meant to be underwater all the way.. theres a "maximum water line" printed on the heater itself..
Actually that looks like a Top FinŽ Submersible
Aquarium Heater to me. I think that the water line is a "Minimum" water line.
29 gallon, Fluval 306. Aquatop PF25-UV Power Filter, 1x39 watt T5HO 7" above tank. P.F. Sand, Pressurized CO2, 5 Glowlight Tetra's, 3 Halequin Rasborah's, 3 neons, 2 Oto's, 5 Cherry Shrimp, 4 Amano Shrimp.