Review on Submersible Fish Tank Heater - 500W Digital Aquarium Heater with Readout for 60-100-150 Gallon Saltwater or Freshwater, External Thermostat Titanium Safe Controller, Includes 2 Artificial Plants as a Gift by Deborah Velarde

Worked fine for a month. Then I noticed that one day my tank was 93°C and the temperature on the heater read 54°. I twisted it a bit and it fixed, but after a few weeks it got stuck again and then it stopped working and started blinking E1. What a waste of money. I've had many space heaters over the years, some of which were pretty cheap, even ones that lasted more than a month. So disappointed!