Review on High-performance Hygger Titanium Aquarium Heater: Fast Heating & Digital Temp Control for 60-180 Gallon Freshwater Marine Tanks by Nadia Miller

I was very shocked by the product when I put my hand in the aquarium for maintenance. It wasn't intermittent, it was a constant stray current. The pain felt like I was being stung by bees every time I dipped my fingers in water. I have been involved in water sports for over 20 years. I have never experienced anything like this with any type of pump or heater. The item was fully submerged in water and the instructions were followed. The item showed no visible signs of wear or damage. I've been using this heater for less than a month.