EHEIM Thermocontrol E 400

The EHEIM thermocontrol E heating element delivers precise, reliable temperature control for any aquarium size.

With the EHEIM thermocontrol E heating element your fish get the right temperature even more precisely - in every aquarium.

The obvious ideas are often the best. This also applies to the aquarium heating element. It is simply hung in the water and heats it up. The principle is the same as it was decades ago. But in the meantime the EHEIM controller heater has become an ultra-modern thermal device. The temperature can be set precisely and is measured even more precisely and kept more constant by the electronics. The coating made of special laboratory glass increases the heating surface, serves as a heat shield and ensures even heat emission.

With the EHEIM thermocontrol E heating element your fish get the right temperature even more precisely - in every aquarium.

The obvious ideas are often the best. This also applies to the aquarium heating element. It is simply hung in the water and heats it up. The principle is the same as it was decades ago. But in the meantime the EHEIM controller heater has become an ultra-modern thermal device. The temperature can be set precisely and is measured even more precisely and kept more constant by the electronics. The coating made of special laboratory glass increases the heating surface, serves as a heat shield and ensures even heat emission. And whether you want to heat a 20 or 1200 litres aquarium - you can choose from 10 sizes.

Advantages of the EHEIM control heater thermocontrol E

• Precise temperature adjustment from 20 to 32 °C
• No readjustment necessary
• Control accuracy ± 0.5 °C
• The heat is kept constant
• Control lamp indicates the heating function (red: heating up; green: temperature reached)
• Fully submersible (waterproof)
• With dry-running protection (Thermo Safety Control)
• Glass coating increases the heating surface and ensures optimum, even heat output
• Convenient cable length approx. 170 cm
• Including double suction holder
• 10 sizes for aquariums from 20 to 1200 litres
• Suitable for fresh and marine water
• Highest safety and reliability - 3 years warranty
• Made in Germany

Precision, comfort, quality and safety "Made in Germany".

As you know, fish from tropical and subtropical waters need a certain constant water temperature. Before the engineer Eugen Jäger invented the aquarium heater decades ago, there was no really satisfactory solution to produce the appropriate water temperature. They dealt with complicated and sometimes curious methods. Some put the aquarium in the sun or by the heater or stove.
The EHEIM thermocontrol aquarium control heater is a further development of the legendary heating element and thermocontrol-e is the latest electronically controlled variant.
The temperature can be precisely adjusted from 20 to 32 °C. The control accuracy is ± 0.5 °C.
The heat is kept constant. A control lamp indicates the heating function.
The heater is absolutely waterproof, can be fully immersed, has a dry run protection (Thermo Safety Control) and is suitable for fresh and marine water. One of the most important innovations is the glass coating:
•    It increases the heating surface,
•    compresses the heat, ensures optimum, uniform heat output and
•    forms a heat shield (the aquarium inhabitants do not mind touching it).

The coating is made of special laboratory glass. This was created for research purposes. It is therefore free of pollutants that could be released into the water. Chemical and biological substances do not attack it. There are no cracks and hairline cracks through which condensation water could pass. It is impact resistant. And even extreme temperature fluctuations, such as those that may occur during water changes, do not affect this glass.

What's in the Box

Thermocontrol e 400 W heater with its integrated electronic controller and status lamp, a double suction cup holder, and the manual. The mains lead is approximately 170 cm.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number — or email us, if you would rather — and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.