Treating your tropical or marine fish to one of these heaters means the lucky things get to take advantage of their in-depth aquarium heater experience and knowledge. You get to relax at the thought of the 2-year guarantee and excellent safety credentials. These heaters are super-reliable, and thanks to the extra-thick safety glass and plastic end cap, are also extra safe. The positive click-control makes its easy to adjust the temperature precisely, but as the heater is already set to 24C you might not find you need to. 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. 50 W model for aquariums from 23 to 45 litres, heater dimensions 26.3 cm x 2.5 cm x 2.5 cm. Interpet Deltatherm Heaters are made from thickened safety glass with a new positive click control for temperature adjustment. It also has a thickened plastic cap for extra safety. Can also be used as a Shepherdess Heater Element for livestock feeding.