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.

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.

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.

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.”

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fluval E 300 Watt Electronic Heater

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: 2221553

Details

Brand
Fluval
Capacity
375 liters
Color
Blue
Power Source
Corded
Wattage
300 watts

🧠Dual sensor microprocessor control

🌡️300W precise heat output

🛡️Integrated fish guard safety

₹ 10361

Duties & taxes included

In stock

Sold byAmazon IndiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to India.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

🌊 Keep your aquarium thriving with smart, safe, and sleek heating innovation!

TRUSTED DURABILITY - Backed by a 5-year warranty, this heater is built to perform and last.
SAFETY FIRST DESIGN - Integrated fish guard protects your aquatic friends from harm—because they deserve the best.
SLEEK SLIM MOUNTING - Discreet slim bracket fits seamlessly into any aquarium setup without clutter.
SMART DUAL SENSOR TECH - Real-time monitoring with dual sensors ensures unmatched accuracy and reliability.
PRECISION HEATING MASTERY - Adjust temperature in ultra-fine 0.5°C increments for the perfect aquatic climate.

The Fluval E 300 Watt Electronic Heater features advanced VueTech technology with a digital microprocessor and dual temperature sensors for precise, real-time temperature control. Designed for aquariums up to 375 liters, it offers 0.5-degree increment adjustments and an integrated fish guard for enhanced safety. Its slim mounting bracket ensures a clean setup, while a 5-year warranty guarantees long-term reliability.

Specifications

ASIN	B001VMSK0I
Best Sellers Rank	#15,765 in Pet Supplies ( See Top 100 in Pet Supplies ) #18 in Aquarium Heaters
Brand Name	Fluval
Capacity	375 liters
Color	Blue
Customer Reviews	4.3 4.3 out of 5 stars (6,214)
Global Trade Identification Number	00015561107747
Heat Output	300 Watts
Included Components	Fluval Advance Electronic Aquarium Heater (300 Watt)
Is Electric	Yes
Item Type Name	HAGEN FLUVAL E 300W HEATER
Item Weight	0.37 Kilograms
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	A774
Manufacturer Warranty Description	5 years; 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 d…
Material Type	Plastic
Model Number	A774
Mount Type	Slim mounting bracket
Power Source	Corded Electric
Style Name	E300
UPC	015561107747 015561014168
Unit Count	1.0 Count
Voltage	230 Volts
Wattage	300 watts

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced from reputable international marketplaces in US, UK, and UAE. We have a robust verification process to ensure product authenticity, and each item is inspected at our warehouse before shipping to customers. Every product comes with applicable warranties and our standard return policy for your peace of mind.

How long does delivery take to India and is it reliable?+

We typically deliver within 4-9 business days to major Indian cities. Each order is trackable end-to-end 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.

Why are prices different from Amazon prices?+

All products are sourced from US, UK, and UAE. Our prices include international shipping costs, customs duties, payment processing fees and logistics handling to ensure smooth delivery to India. We handle all customs clearance so you don't face any hidden charges later.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Zainab N.

Fantastic and great service. Shipping was faster than expected.

1 week ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot 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

Shop on the go, anytime, anywhere.