The most obvious ideas are often the best. This is also true for the aquarium heater. It is simply hung in the water and warms it up. While the principle is still the same as it was decades ago, the Eheim regulator heater is now a state-of-the-art thermal device utilizing the latest technology. The temperature can be precisely set and maintained consistently. A coat made of special laboratory glass increases the heating surface, acts as a heat shield, and ensures even heat distribution. The temperature can be accurately adjusted from 18 to 34 °C and fine-tuned if necessary (±2°). The regulation accuracy is ± 0.5 °C. The heat is kept constant. A control light indicates the heating function. The rod is completely waterproof, can be fully submerged, and features a dry run protection (Thermo Safety Control).