EHEIM thermocontrol 250 heater

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

Diameter Ø 36 mm

Height 452 mm

Performance at 50 Hz 250 watts

Maximum temperature 34°C

Seawater Yes

Minimum temperature 18°C

Freshwater Yes

Packing dimensions (width) 6.5 cm

Packing dimensions (height) 58.5 cm

Packing dimensions (depth) 5 cm

For aquariums up to approximately 600 liters

For aquariums of approximately 400 liters

Clear ideas are often the best. For example, an aquarium heater as a stick. The heating rod is simply suspended in the water and 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 highly modern electronic thermal device with the best available technology. Its casing made of special laboratory glass increases the heating surface, acts as a thermal shield, and ensures perfectly even heat distribution. And regardless of whether you want to heat a 20-liter or 1000-liter aquarium - you have 9 sizes to choose from.

Benefits of EHEIM Thermostatic Heaters

Precise temperature adjustment from 18 to 34 °C

Simple and safe recalibration (±2 °C)

Temperature control accuracy ±0.5 °C

The heat retains a constant level

The heating function is indicated by a control lamp

Completely waterproof (sealed)

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

The glass casing increases the heating surface and ensures ideal even heat distribution

Convenient cable length approximately 170 cm

Includes double suction cup holder

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 thermal rod.

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

The heat remains at a constant level. The heating function is indicated by a control lamp.

The rod is completely sealed, 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 casing:

- Increases the heating surface,

- Focuses heat, ensures ideal even heat distribution and

- Forms a thermal shield (touching it does not harm marine life).

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