Elite submersive 150 watt Internal Aquarium Heater From Hagen is the elite submersive heater, an internal Pre-Set aquarium heater. This heater is 150 Watt and is ideal for 150 litre reservoir. This internal heater can be used for either freshwater or saltwater aquariums, it is made of high impact safety glass and comes with a sucker to attach the heater onto the aquarium. Features