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.”

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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.”

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🔥 Keep it cozy, keep it classy! 🌊

SAFETY FIRST - Integrated fish guard ensures a safe environment for your aquatic friends.
SLEEK AND COMPACT - Stylish black finish fits seamlessly into any aquarium setup.
ENERGY EFFICIENT DESIGN - Save on energy bills while keeping your tank cozy.
VERSATILE DISPLAY OPTIONS - Easily switch between Fahrenheit and Celsius for your convenience.
PRECISION TEMPERATURE CONTROL - Experience real-time accuracy with dual temperature sensors.

The Fluval E Heater 300W is a state-of-the-art aquarium heater designed for precision and safety. With dual temperature sensors and an LCD display, it provides real-time temperature readings in both Fahrenheit and Celsius. Its fast heat technology ensures your aquatic environment is always at the perfect temperature, while the integrated fish guard protects your fish and invertebrates. Energy-efficient and stylish, this heater is perfect for any indoor aquarium setup.

Reviews

J**S

Great heater

Great heater and super helpful to have the digital gauge on the front

13.09.2024

G**.

Bastante bueno y muy buen precio

Funciona muy bien

11.06.2024

T**A

Doppvärmare akvariet

Funkar pefekt!

14.10.2024

P**.

Ottimo riscaldatore per acquario con display chiaro e semplice

Utilizzo questo riscaldatore in parallelo ad uno più semplice in vetro.La regolazione è precisa e semplice. I colori del display permettono di capire immediatamente se la temperatura è in linea con quella impostata, inferiore o superiore!Ottimo prodotto con la calotta in plastica per proteggere da urti.

29.04.2022

E**.

Muy buenos.

Tengo varios de estos calentadores y son muy precisos. Compré el primero un poco para probar, por que no conozco a nadie que los tenga y no sabía nada de ellos.Tienen una pantalla lcd que te indica la temperatura del agua en todo momento. En azul cuando está más fría de la temperatura seleccionada, en verde cuando está a la temperatura deseada y en rojo cuando está más caliente de lo que debería. Esto aunque no lo parezca es un plus de tranquilidad, por que no es como los otros que ves la luz roja o verde si está o no trabajando, este te pone en pantalla la temperatura y lo de que te vise si por lo que sea la temperatura varía es un plus.Se pueden sumergir completamente y son muy fáciles de manejar, tienen una pestaña roja en la parte de arriba con la que subes o bajas la temperatura de medio en medio grado.Las ventosas son de las buenas, agarran mucho y bien, por ese aspecto no hay queja. El cable es bastante largo, por que que por ese lado tampoco hay problema.Vienen protegidos con una carcasa plástica para evitar que los peces se puedan arrimar y quemarse como pasa a veces con los calentadores que vienen solo con el cristal.No son baratos, pero en mi opinión es una comprá más que recomendable.

5.06.2021

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Product Dimensions	4.57 x 8.38 x 46.23 cm; 371 g
Item model number	A774
Pet Life Stage	All
Flavor	Flavorless
Allergen Information	Nut Free
Color	Black
Size	E300
Volume	0.2
Quantity	1
Special Features	Energy Efficient
Specific Uses	Indoor
batteries required	No
Batteries Included	No
Voltage	230 Volts
Wattage	300 watts
Item Weight	371 g

FluvalE Heater 300W

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