With the adjustable precision heater EHEIM, your fish enjoy the exact temperature in every aquarium. Obvious ideas are often the best, and this also applies to the aquarium heater. It is simply hung in the aquarium to provide heat. The principle is the same as it was decades ago. However, since then, the adjustable EHEIM heater has become a very modern device that meets the latest technical standards. The temperature is precisely set and remains constant. A special laboratory glass jacket increases the heating surface, acts as thermal protection, and ensures even heat distribution.