The Fluval Marina Betta Kit Heater is an automatic submersible heater specifically designed for small aquariums with a volume of up to 5 liters. With a power input of 8 watts, it ensures a reliable and constant water temperature that is crucial for the well-being of Betta fish and other small aquarium inhabitants. The heating element is made of durable polymer, which enhances its longevity and safety during use. The preset temperature allows for easy operation, while the included suction cups ensure straightforward installation in the aquarium. This heater is a practical solution for aquarium enthusiasts seeking an efficient and user-friendly heating technology to create optimal living conditions for their fish.