Aquael Ultra Heater D&N

Aquael Ultra Heater D&N

  • Smart heating system
  • Day/night sensor
  • Fully electronic
  • Temperature display
  • +/- 0.25°C Accuracy
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The Aquael Ultra Heater D&N is an aquarium heater designed for precise temperature control during both day and night. The innovative technology of this device allows for the maintenance of constant water temperatures or the replication of natural temperature fluctuations between day and night, as found in aquatic ecosystems. The features of the Ultra Heater Day&Night include a fully electronic system without susceptible mechanical components, an integrated thermal cut-off to prevent overheating, and a display that clearly shows both the current and set temperatures. The device is equipped with Smart Heating System technology that intelligently adjusts heating power as needed and ensures thermostat precision of +/- 0,25°C.

The modern, flat design of the heater seamlessly integrates into any aquarium's appearance, while the shatterproof housing ensures even heat distribution. Thanks to the DAY & NIGHT SENSOR, the Ultra Heater D&N intuitively adapts to light conditions and switches accordingly between modes. Users can choose between a constant mode, which maintains the same temperature throughout day and night, and a D&N mode, which allows for different temperatures during day and night. This feature creates conditions as close as possible to natural thermal environments by mimicking the daily temperature amplitude in the aquarium.


Intuitive change of operating mode
Left: OFF Constant Mode - Right: ON D&N-Mode

With a range of power options from 25 W to 200 W, the Aquael Ultra Heater D&N covers a broad spectrum of aquarium volumes, making it a flexible choice for many types of aquariums. The ease of use and adaptability to different environments make this heater a reliable choice for creating optimal living conditions for sensitive aquarium inhabitants.

Flyer Ultra Heater D&N in German - - download PDF

Manual Ultra Heater D&N - - download PDF


  • Precise temperature regulation for day and night
  • Fully electronic operation without mechanical thermostat components
  • Integrated thermal safety shut-off
  • Display of current and programmed water temperature
  • Smart Heating System for heating power adjustment
  • Thermostat precision of +/- 0,25°C for consistent warmth
  • Modern, space-saving design
  • Shatterproof housing for durability
  • Intuitive switch between D&N and constant modes


BASIC MODE: Desired temperatures are set using a button and indicated by LED lights. Blue LEDs represent temperatures from 20-23°C, green from 24-29°C, and red from 30-33°C. Pressing the button increases the temperature by 1°C. After setting, all LEDs briefly flash to confirm the temperature is saved. If the maximum temperature of 33°C is reached, another press resets it to 20°C.

The heater displays the current water temperature: if it's below the set temperature, the LEDs pulse up to the set temperature. If the current temperature matches the set one, a single LED lights continuously. If the current temperature is higher, the corresponding LED flashes rapidly.

D&N MODE (Day & Night): This mode is activated by shifting the sensor cover to ON. In sufficient light, the heater operates in Day Mode, indicated by a white LED. Temperatures can be set as in Basic Mode and remain active until the lights go out. At night, a different temperature can be set, ideally 1-2°C different from the day setting, to mimic natural conditions. For setting the Night temperature, you can simply cover the sensor briefly.


Aquael Ultra Heater D&N - 25 W
Suitable for aquariums 10-25 l
Height 16,3 cm
Aquael Ultra Heater D&N - 50 W
Suitable for aquariums 15-50 l
Height 16,3 cm
Aquael Ultra Heater D&N - 75 W
Suitable for aquariums 35-75 l
Height 20,8 cm
Aquael Ultra Heater D&N - 100 W
Suitable for aquariums 60-100 l
Height 20,8 cm
Aquael Ultra Heater D&N - 150 W
Suitable for aquariums 90-150 l
Height 27,4 cm
Aquael Ultra Heater D&N - 200 W
Suitable for aquariums 130-200 l
Height 27,4 cm



The aquarium company Aquael, based in Poland, is known for its innovative and affordable aquarium accessories. With a passion for ecological technologies, the company's products aim to support the lives of animals and inspire aquarists for a more natural experience.
Their wide range of products therefore includes everything for a successful underwater experience. Not only small and large aquariums, with or without base cabinets, but also aquarium technology such as filters, heaters, automatic feeders and small parts including scissors and fishing nets - Aquael has thought of everything.

General information

Item no.
EAN 5905546335942
Weight 0,28 kg
Shipping weight 0,29 kg

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