"The Marina C25 is a 25 watt compact, submersible heater for use in indoor aquariums. It is designed to reach and maintain the pre-set temperature of 26 °C (78 °F), without having to make any adjustments.
The exterior is made of a tough polymer so that it will not crack or break like traditional glass sleeve heaters. It includes an LED running lamp that illuminates when in use and it shuts off automatically when not submersed in water.
The heater is suitable for fresh and saltwater aquariums up to 25 liters (6.6 U.S. gallons). Its sleek and compact design makes it ideal for use in Nano aquariums. It comes complete with 2 suction cups for easy and secure installation.