Save your aqua friends from the chilling temperature with mini 50-watt Marina submersible aquarium heater. Its compact size saves much space and provides reliable heating for fresh or saltwater aquariums up to 20 litres aquariums. The heater has an easy-to-access temperature set dial, an on/off pilot light indicator, and a bumper guard for fish safety. Made of high-impact glass, it is built to last under normal aquatic conditions and is durable. Marina Submersible Pre-Set Mini Heater 25W