This is higher wattage for a bigger tank. The main body is titanium because it seems they hold up the best. The displayed temperature is within 1 degree as verified by my calibrated thermometer.

It keeps my tank between 76-82 degrees.

It only heats, and heats, then heats some more. It works by just heating the water in the tank while the heat also escapes into the surrounding air. The water was overheated.

Caveat emptor. I wish i'd spent a little more, & gotten one that would work for a longer period of time. Don't usually even write reviews.