Submersible aquarium heaters for amicable heating

Recently I installed a titanium submersible heater in my aquarium as I heard  that they are virtually indestructible. This submersible heater came along with a separate controller that has automatic shut off facility when the water level drops or when they are exposed to air when plugged in. this heater has a voltage of  500 watts and is ideal for the size of my acrylic aquarium.  Though Submersible Aquarium Heaters cost me a handsome amount of money I have no regrets as this titanium heater offers superior heat conduction, is very accurate and is also corrosion resistant both in fresh water and salt water.