Tetra Submersible Aquarium Heater, 50-Watt

Walmart # 563284156

Tetra Submersible Aquarium Heater, 50-Watt

Walmart # 563284156
Free 2-day shipping on orders over $35
Free pickup Wed, Jun 20
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  • 50-watts
  • For aquariums up to 10 gallons
  • Electronic thermostat maintains water temperature
  • Easy to use
  • Read more....

    About This Item

  • 50-watts
  • For aquariums up to 10 gallons
  • Electronic thermostat maintains water temperature
  • Easy to use
  • Customer Reviews
    2.9 out of 5 Stars
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    1-5 of 153 reviews

    Mine died too.

    I have a 30 gallon long aquarium and managed to break my 300 watt non-submersible heater that was 8 years old (I think it was a Tetra too) by letting the water level get too low. It was still working fine prior to the incident. I purchased this 50 to go along with another submersible 50 watt (adjustable) that I had thinking that 100 total would be fine, and it was. The heater cycled on and off and maintained temp normally. After a couple weeks I noticed that the water was getting too cool and the red LED was off so I unplugged and plugged it back in and it came on. Now it will not come on at all even with the water temp at 64° so I took it apart to see how it worked. It is based on an LM324 quad op-amp and 2 temp sensors that appear to be thermal diodes but are labeled NTC on the board. These 2 sensors drive 2 of the 4 op-amps and the output of the 2 drive the third which controls the triac that switches the power to the element. The fourth op-amp is unused. The red indicator LED and its dropping resistors are hooked directly across the element. I think moisture may have gotten in and ruined the electronics. It is not serviceable as it is glued together with CA (super glue) and I broke the glass tube trying to take it apart.

    Struggles to keep my half full 55 gal tank warm

    Product states it is good for up to 60 gallons and will keep it at 78 degrees. In reality, it struggles to keep 25 gallons at a 24 hour average of 75.82 with a max of 76.93 in a 24 hour period. It's better than nothing, but barely.

    Betta Fish no longer shivering

    I was not aware that a Betta fish prefers a warm environment. When he stopped moving or eating I researched the symptoms on the net. Sure enough, they like it 78 -82 degrees. Without a heater it was about 68 degrees. Burrrr. The Tetra heater is the perfect size and has made all the difference in his quality of life. So far it is a steady 78 degrees and he loves it. The heater is under the rocks out of sight. It was so simple to find it, pay for it on Walmart.com and have it shipped to a nearby store. :-)'s
    Brutus the Beta in paradise

    Failed :-(

    Was good while it lasted... After about 3 years of sporadic use, it over heated the tank by 10°C!!! Hopefully my betta survived..
    Tetra is sorry to hear this occurred! Please contact our Care Team at 1-800-526-0650.

    Great heater for small tank.

    I bought this heater for my daughters new betta fish 2 gallon tank. I love the fact that it suctioned on the side of the tank & also has an auto shut off when it reaches correct temp. He dif. seems to like it being warm.
    Very well hidden by decor
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