With the EHEIM precision heater your fish receive exactly the right temperature – in any aquarium. Made in Germany! Obvious ideas often are the best ones. For example, the aquarium heater 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 7 or a 250 gallon aquarium – you have many sizes to choose from. Benefits of the EHEIM JAGER heaters Precise temperature adjustment from 65°F up to 93 °F 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 salt water Sizes 50W - 7-16 Gallons 75W - 16-26 Gallons 100W - 24-40 Gallons 125W - 40-53 Gallons 150W 53-79 Gallons 200W - 79-106 Gallons 250W - 106-159 Gallons 300W - 159-264 Gallons