Home/HEATING/HEATERS/E Series/E300 Advanced Electronic Heater, 300 W, up to 100 US Gal (375 L)

E300 Advanced Electronic Heater, 300 W, up to 100 US Gal (375 L)

SKU: A774 | UPC: 015561107747
Format: 2 Lx 1.125 W x 14 H" (5.0 L x 2.8 W x 35.5 H cm)
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E-Series is the only digital heater range on the market to offer dual-sensor VueTech® microprocessor technology, which continuously displays accurate water temperature and visually alerts the user of any fluctuations.

  • 300-Watt heater designed for aquariums up to 100 gallons
  • Displays water temperature digitally in Celsius or Fahrenheit
  • Precision temperature control allows for increments (+ or -) of 0.5 degrees
  • VueTech® system will change display colors if set temperature varies +/- 1°C or +/- 2°F (blue = low, green = safe zone, red = high)
  • Integrated fish guard provides added protection
  • Slim mounting bracket
  • For use in freshwater and saltwater aquariums
Item #
Aquarium Capacity15 US Gal
(50 L)
30 US Gal
(100 L)
65 US Gal
(250 L)
100 US Gal
(375 L)
Wattage50 W100 W200 W300 W
(L x W x H)
2 x 1.125 x 9.75"
(5.0 x 2.8 x 24.7 cm)
2 x 1.125 x 11.75"
(5.0 x 2.8 x 29.8 cm)

2 x 1.125 x 14"
(5.0 x 2.8 x 35.5 cm)

2 x 1.125 x 14"
(5.0 x 2.8 x 35.5 cm)


Fluval E Series Heaters are guaranteed against defects in material or workmanship under normal aquarium usage and service for 5 years. We offer a 5 year guarantee on all nonreplaceable parts which means that the heater will be repaired or replaced at the

manufacturer’s discretion, free of charge, when the complete heater is returned with proof of purchase and postage paid. This warranty does not apply to any heater that has been subjected to misuse, negligence, or tampering. No liability is assumed with respect to loss
or damage to livestock or personal property irrespective of the cause thereof.


E HEATERS2020-10-06T16:10:19-04:00



Why is my E Series heater not reaching the desired temperature?

Because an E Series heater is housed in a protective casing, it’s important to ensure it is located in an area with strong water movement. Ambient room temperature is also a factor. If the difference is more than 8 degrees Fahrenheit (approx. 3 degrees Celsius) between ambient and set heater temperature, additional heating capacity is required (add another heater or upgrade existing power).

Is the E series heater fully submersible?

Yes, the E Series heaters are fully submersible. The instructional manual specifies a minimum water level.

Why does my E Series heater sometimes flash blue in the morning?

This is due to the fact that the water temperature has dropped by one or two degrees overnight.

My heater won’t hold a temperature of 80°F (26.7°C) in my aquarium. Do I need to add more heating power?

Most likely the answer is yes. If you wish to maintain 80°F in your aquarium, you will likely need more power or begin by warming up the room itself as ambient temperature is very important. The cooler the room is, the greater the energy requirement to increase the aquarium temperature.

Why is my E series heater not reaching the desired temperature?

As E series heaters are housed in protective casings, it’s important to ensure they are subjected to strong water movement. Ambient room temperature is also a factor: if the difference between it and the heater’s set temperature is more than 6°C (10°F), additional heating capacity is likely necessary. You can either add another heater or upgrade to a more powerful unit.

Are E series heaters fully submersible?

Yes, E series heaters are fully submersible.

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