The Fluval Tronic 100 Watt Submersible Electronic Heater offers a
technologically advanced operation system that delivers accurate, responsive,
safe and reliable heating for fresh and saltwater aquariums. The patented
thermal sensor continuously monitors the aquarium's water temperature to
maintain precise temperature control. The unit heats continuously until the
selected temperature has been achieved, providing quick and accurate temperature
control. There are no mechanical components to wear. The numeric temperature
dial makes it easy to select desired temperature. The safety shut-off feature
allows the heater to switch off if it is accidentally removed from the water.
Ideal for aquariums up to 30 US gallons (100 L).