Fluval E300 Advanced Electronic Heater, 375 L

Fluval E300 Advanced Electronic Heater, 375 L

Q: Just can't seem to adjust the temp. It flashes 77, but the temp stays at 75. Why?

I was having the same problem, though mine was stuck at 74.5--it stayed blue and never got higher, though it was set to 77. I called Hagen, and they said try unplugging it for 10 minutes, then plug it back in to see if that helps. It didn't; they'd said if that was the case it was defective and to return it. Mine was <1 week old.

Q: I just bought this item September of last year and it wont let me adjust the temperature after the initial setting when I first had it

So you move the adjusting orange dial/thingy and doesn't change temp? Some times you have to move it all the way, let it return to the neutral position and the move it again to and so on. If that doesn't work, it may be faulty, contact Fluval, these have good warranty.

Q: does this heater go in the tank

To clear any confusion, the heater is fully submersible to 39 inches. The photos in the instruction showing tank placement are misleading. The ones marked with an X means do not let it hang by the cord and do not just lay it on the bottom of the tank. Rest assured that the unit is sealed well and you are better off fully submerging the unit to prevent water evaporation from negatively affecting the heater.

Q: Will I have "low flow" problems running only sponge filters?

Your air pump running the sponge filters circulate the water. The pump power will determine whether or not there is “low flow.”

Product ID: 77778509

Secure Transaction

Details

Brand
Fluval
Special Feature
Adjustable
Colour
Black
Form Factor
Tower
Indoor/Outdoor Usage
Indoor

⚡Fast heat tech with safety shutoff

📊Real-time LCD display in °F/°C

🌡️Dual temp sensors for precision

Frequently Bought Together

Fluval E 300 Watt Electronic Heater

PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic

API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

Description

🌊 Keep your aquarium thriving with tech that’s as smart as you are!

FISH SAFE DESIGN - Integrated fish guard and automatic shutoff protect your aquatic friends 24/7.
SLEEK SPACE SMART - Slim profile with floor mount bracket fits seamlessly into any modern aquarium setup.
INSTANT VISUAL FEEDBACK - Color-changing LCD alerts you immediately if temps stray from the ideal range.
RELIABLE POWER WARRANTY - 300W heating power supports up to 100 gallons with a reassuring 5-year warranty.
PRECISION TEMPERATURE CONTROL - Dual sensors ensure your aquatic ecosystem stays perfectly balanced.

The Fluval E300 Advanced Electronic Heater is a cutting-edge 300W submersible heater designed for aquariums up to 100 gallons. Featuring dual temperature sensors and a color-changing LCD display, it provides real-time, precise temperature monitoring in both Fahrenheit and Celsius. Its fast heat technology includes a safety shutoff and integrated fish guard to protect aquatic life. With a slim profile mounting bracket and a 5-year warranty, it combines reliability, safety, and sleek design for professional aquarium care.

Specifications

Brand	Fluval
Special Feature	Adjustable Temperature
Colour	Black
Form Factor	Tower
Indoor/Outdoor Usage	Indoor
Product Dimensions	4.6D x 8.4W x 46.2H Centimeters
Recommended Uses For Product	Aquarium
Mounting Type	Floor Mount
Burner type	Radiant
Voltage	230 Volts
Min Temperature Setting	20 Degrees Celsius
Max Temperature Setting	2 Degrees Fahrenheit
UPC	015561107747 015561014168
Global Trade Identification Number	00015561107747
Manufacturer	Fluval
Country of Origin	USA
Item model number	A774
ASIN	B001VMSK0I

Have a Question? See What Others Asked

Just can't seem to adjust the temp. It flashes 77, but the temp stays at 75. Why?

I just bought this item September of last year and it wont let me adjust the temperature after the initial setting when I first had it

does this heater go in the tank

Will I have "low flow" problems running only sponge filters?

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App