EHEIM thermocontrol 25 heater

With the precise EHEIM heater, your fish get the perfect temperature - in any aquarium.

Diameter Ø36 mm

Height 243 mm

Performance at 50 Hz 25 watts

Maximum temperature 34°C

Suitable for saltwater Yes

Minimum temperature 18°C

Suitable for freshwater Yes

Packing dimensions (width) 6.5 cm

Packing dimensions (height) 34.5 cm

Packing dimensions (depth) 5 cm

For aquariums up to approximately 25 liters

For aquariums of approximately 20 liters

Often, the simplest ideas are the best. For example, an aquarium heater as a stick. Simply hang the heating rod in the water and it heats it. It's true that the principle remains as it was decades ago. But much has changed in the meantime. Today, the adjustable EHEIM heater is a modern electronic thermal device with the best available technology. Its special laboratory glass casing increases the heating area, acts as a thermal shield, and ensures ideal, even heat distribution. Whether you want to heat a 20 or 1000-liter aquarium - you have 9 sizes to choose from.

benefits of EHEIM thermal heaters

Precise Edit of temperature from 18 to 34 °C

Easy and safe recalibration (±2 °C)

Temperature control accuracy ± 0.5 °C

Maintaining heat at a constant level

The control lamp indicates the heating function

Fully compact (waterproof)

With automatic shut-off when dry (thermal safety control)

The glass cover increases the heating area and ensures ideal even heat distribution

Convenient cable length of approximately 170 cm

Includes a double holder for the suction cup

9 sizes for aquariums from 20 to 1000 liters

Suitable for fresh and saltwater

Precision, ease of use, quality, and safety "Made in Germany"

The EHEIM aquarium heater is a further development of the legendary heating rod.

The temperature can be precisely adjusted from 18 to 34 °C and recalibrated if necessary (±2°). The temperature control accuracy is ± 0.5 °C.

The heat is maintained at a constant level. The control lamp indicates the heating function

The rod is completely waterproof, can be fully submerged, and features automatic shut-off when dry (thermal safety control) and is suitable for both fresh and saltwater.

One of the most important innovations is the glass cover:

- Increases the heating area,

- Focuses heat, ensures ideal even heat distribution and

- Forms a thermal shield (touching it does not harm living organisms).

The cover is made of special laboratory glass developed for research purposes. Therefore, it is free from contaminants that could be released into the water. It is resistant to chemical and biological substances. It does not have cracks or fractures that would allow condensation to leak. Even extreme temperature fluctuations that can occur during water changes do not harm this glass.