Marina Submersible MINI Aquarium Heater. Small yet powerful, the mini 25-watt/50-watt Marina Submersible Aquarium Heater provides reliable heating for fresh or saltwater aquariums up to 20 litres (5.5 US gal) / 38 litres (10 US gal) aquariums. The heater includes many practical features for easy use, safety and convenience, including an easy-to-access temperature set dial, on/off pilot light indicator, and a bumper guard for fish safety. Made of durable high-impact glass, it’s built to last under normal aquatic conditions. 25-watt / 50-watt submersible heater for fresh or saltwater aquariums Length: 15 cm (6”) For 20 L (5.5 US gal) / 38 L (10 US gal) aquariums Easy-to-access temperature set dial Easy-to-read temperature settings On/Off pilot light indicator Impact-resistant glass design Bumper guard for fish safety Water proof sealing Pilot light Includes bracket with suction cups for easy, secure installation CSA approved 1.8 metre electrical cord Temperature heating range: 20° C to 28° C (68° F to 82° F)