Review on Hygger Titanium Aquarium Heater: Digital Submersible Heater for Saltwater & Freshwater Tanks - Ideal for Fish Tanks Ranging from 5 to 120 Gal by Jade Allen

It perfectly keeps the water temperature right where you want it and the digital display is perfect. The only thing missing is the suction cups: the heating element often falls off the glass, so I have to constantly reach into the tank to fix it. My last two heaters (Marineland and Eheim) may have failed much sooner than they should, but at least their suction cups never came loose from the glass.