Eheim Thermocontrol e 300 Heater
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.
| Specification | Value |
|---|---|
| Diameter | 36mm |
| Min. temperature | 20 degrees |
| Max. temperature | 32 degrees |
| Performance at 50 Hz | 300 Watt |
| Recommended aquarium size | 600L |
FAQ
What is the maximum temperature the heater can maintain?
The heater can maintain a maximum temperature of 32 degrees Celsius.
Can the heater be used in smaller aquariums?
It is designed for aquariums of about 600L. For smaller tanks, the heating capacity may not be sufficient to maintain stable temperatures.
Is the heating element easy to install?
Yes, it is simply hung in the water and requires no complex setup.


Stewart Fraser –
The heater works very steadily and keeps the water temperature consistent even during temperature fluctuations. I’ve used it for over a year and it hasn’t shown any signs of wear. The glass coating helps distribute heat evenly, which is great for my planted tank.
Mary Parsons –
It’s reliable and easy to set up. I adjusted the temperature to 28 degrees and it maintains it well. The only thing is that it’s a bit bulky for smaller tanks, but my 600L tank handles it perfectly.
Amanda Peters –
I was worried about temperature spikes, but the Eheim heater keeps things stable. The digital control is intuitive and the glass coating prevents hot spots. Great for a community tank with fish sensitive to temperature changes.