Finnex digital titanium heaters use new technology with precision digital control to maintain water temperatures at a constant level. The titanium tubes are corrosion-resistant, making them virtually unbreakable. These advanced heaters paint water temperatures within =/-2 degrees F of the set value providing a safe, healthy, and stable temperature for your tank. In case of a power failure, these heaters are equipped with memory to restore your original settings, making this heater one of a kind in the aquatic market.