The Aquael Ultra Heater is easy to control using the ONE-TOUCH system that employs a single button surrounded by a ring of LEDs indicating the current and set temperatures.The electronic thermostat operates with an exceptional precision (+/- 0.25° C) to maintain a constant temperature in the tank. This ensures that even the most sensitive of aquarium animals will stay comfortable at all times. Temperatures can be set in the range between 20 and 33 °C, which means that the heater can be used in treating various fish diseases, including white spots. In addition, the ULTRA HEATER has a builtin system to prevent overheating of the tank water in hot weather.Thanks to its unbreakable plastic housing, the ULTRA HEATER is ideal for use in tanks where large and strong fish or even water turtles are kept. At the same time, the heater is totally safe and does not cause burns in even the most sensitive animals, e.g. catfish or rays.