Precise and reliable heating control for tropical aquariums, freshwater and marine. Keep your aquarium at exactly the right temperature with this high performing heater. Extra safe, double insulated and fully submersible, made with heat and shock resistant glass. The positive click-control makes it easy to adjust the temperature precisely, but as the heater is already set to 24°C you might not find you need to. 25 W model for aquariums from 4 to 30 litres, heater dimensions 21.5 cm x 2.5 cm x 2.5 cm. This heater comes with a 2-year guarantee and excellent safety credentials.