With the eheim precision heater your fish receive exactly the right temperature in any aquarium.. Obvious ideas often are the best ones. For example, the aquarium heat-er as a rod. The heating rod is simply hung in the water and heats it. It is true that the principle is still the same as decades ago. But a lot has changed in the meantime. And today the eheim adjustable heater is an ultra-modern electronic thermal device with the best available technology. A jacket made from special laboratory glass increases the heating surface, serves as a heat shield and ensures optimum even heat emission. And no matter if you want to heat a 20 or a 1000 litre aquarium you have 9 sizes to choose from.. Benefits of the eheim thermostatic heaters. Precise temperature adjustment from 18 up to 34 c. Simple and safe recalibration 2 c . Temperature control accuracy 0,5 c. Heat kept at a constant level. Heating function is indicated by a control lamp. Completely submersible watertight . With automatic dry run shut-off thermo safety control . A glass jacket increases the heating surface and ensures optimum even heat emission. Handy cable length ca. 170 Cm. Including double suction cup holder. 9 Sizes for aquariums from 20 up to 1000 litres. Suitable for fresh and marine water. Precision, ease of use, quality and safety made in germany . The eheim aquarium heater is a further development of the legendary heating rod.. The temperature can be precisely set from 18 to 34 c and if required recalibr...