Product: Haget Elite 25w heater
Description: Is designed to hang on the back of your tank. Would not suggest this heater, waste of money IMO, can work good for some time but won't waste that long
Pros: very cheap, pay for what you get
Cons: Is not pre-set so it's best to not have fish in the tank when setting the temperature, once set it does not move, the pilot light always flickers on and off and is noisy, does not keep a steady temperature all the time
Fully submergible heater is not much more expensive than this heater, don't waste your money.