Small yet powerful, the Marina Mini Submersible Aquarium Heater provides reliable heating for small fresh or saltwater aquariums. The heater includes many practical features for easy use, safety and convenience, including an easy-to-access temperature set dial, on/off pilot. With its length of 15 cm the heater is suitable for all small tanks, like Nano aquariums.Marina Aquarium Heater Mini+ fully submersible+ for freshwater and marine water aquariums+ high impact safety glass+ ceramic heater core+ mounting with suction cups+ cable length: 1.80 m+ heats from 20C to 28C+ min water depth: 15 cm, total length: 18.7 cm+ 25 W for aqauriums up to approx. 20 l+ 50 W for aquariums up to approx. 38 l