The Fluval E Series Heaters represent Hagen’s latest most advanced aquarium heaters line. Featuring VueTech technology, the Fluval E Series heaters display water temperature in real-time. Each heater is equipped with an advanced digital microprocessor which continuously monitors the system with the help of dual temperature sensors. This feature is attractive, in particular, for hobbyists not using an aquarium controller.

The display screen of the Fluval E Series aquarium heaters will change colors if the temperature varies +/-1 °C or +/-2 °F or more from the pre-set temperature. The normal green display will turn blue if the temperature drops by more than 2 °F (1 °C) and will turn red if the temperature rises by the same amount. If, however, the temperature swings up or down by 3 °C or 5.5 °F (or more), the colored screen will flash, indicating that there is a problem.

A really cool thing about this line, is that rather than using a dial to set and adjust the temperature. Instead a little lever allows you to modify the temperature settings in 0.5° increments. In case you do not have a sump, and are placing the heater directly in your aquarium, an integrated fish guard ensures that fish and other invertebrates cannot accidentally come in contact with the heating core. Finally, a slim mounting bracket allows you to remove the heater, without having to remove the bracket.