EHEIM thermocontrol 250 heater

With the EHEIM precision heater, your fish will enjoy the perfect temperature in any aquarium.

• Diameter Ø 36 mm
• Height 452 mm
• Performance at 50 Hz 250 Watt
• Max. temperature 34°C
• Sea water Yes
• Min. 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 approx. 600 Liter
• For aquariums of about 400 Liters

Simple ideas often turn out to be the most effective. Take, for instance, the aquarium heater designed as a rod. This heating rod is easily suspended in the water to warm it. While the concept has remained unchanged for decades, significant advancements have been made over time. Today, the EHEIM adjustable heater represents a state-of-the-art electronic heating device that utilizes the latest technology. Its jacket, crafted from specialized laboratory glass, enhances the heating surface, acts as a heat shield, and guarantees optimal, uniform heat distribution. Whether you need to heat a 20-liter or a 1000-liter aquarium, you can choose from 9 available sizes.

Advantages of the EHEIM thermostatic heaters

• Accurate temperature adjustment from 18 to 34 °C
• Easy and secure recalibration (±2 °C)
• Temperature control precision ± 0.5 °C
• Heat maintained at a consistent level
• Heating function indicated by a control lamp
• Completely submersible (watertight)
• Features automatic dry run shut-off (Thermo Safety Control)
• A glass jacket enhances the heating surface and guarantees optimal, even heat distribution
• Convenient cable length of approximately 170 cm
• Includes double suction cup holder
• 9 sizes available for aquariums ranging from 20 to 1000 liters
• Suitable for both freshwater and marine environments
• Precision, user-friendliness, quality, and safety “Made in Germany”

The EHEIM aquarium heater is an advancement of the iconic heating rod. The temperature can be set with precision between 18 and 34 °C and can be recalibrated if necessary (±2°). It maintains a constant temperature level, and its heating function is signaled by a control lamp. The rod is fully watertight, can be completely submerged, and includes an automatic dry run shut-off feature (Thermo Safety Control), making it suitable for both freshwater and saltwater aquariums.

One of the most significant innovations is the glass jacket:

• It expands the heating surface,
• Concentrates the heat to ensure optimal, even heat distribution, and
• Acts as a heat shield (safe for your aquatic life).

This jacket is made from specialized laboratory glass, designed for research applications. Therefore, it is free from harmful substances that could leach into the water. It is resistant to both chemical and biological agents, free from fissures or fine cracks that could allow moisture to seep in. Even extreme temperature fluctuations that may occur during water changes will not damage this glass.