Woliver Submersible Aq...
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AquaMiracle Adjustable...
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Woliver Submersible Aquarium Hea... vs AquaMiracle Adjustable 10/20/30W...

Woliver Submersible Aquarium Heater 200W/3...

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AquaMiracle Adjustable 10/20/30W Small Aqu...

$20.99
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Pros and Cons
Pros3

To set, just choose the heat temp you want by pushing the button. It scrolls through your choices and once you come to the temp, just stop pushing. Shows current and set temps in red.

Straight forward heater and controller. Easy to see, even under bright lights. Installed it a little bit ago and so far so good.

Two suction cups to keep the heater in place. Holding accurate temp and staying put horizontally on the back wall of the tank. Holds temp in aquarium nicely.

Pros4

This is very compact, and just suctions on and starts maintaining the temperature. The heating element attaches to the side of the tank with a suction cup. Only complaint is i thought this model has a usb power capability, so i would not need an elect...  Read More

I have a 3 gallon (pretty much the same as the marineland contour 3 gallon kit) desktop aquarium with a betta fish. This is the best nano tank heater i’ve found so far.

The thermostat is outside the tank making checking the temperature easy. I love knowing what the temp is and it's easy to read if you tie strap the cord in the right place. The digital readout displays the tank temperature for easy monitoring.

The water temperature is maintained within a degree of the preset temperature. It maintains the temperature within less than half adgree fahrenheit. However, it tops out at 75 degrees, so make sure it handles your desired temperature range.

Cons1

My best guess is perhaps the heater leached something into the water. I think this reflects the temp at the sensor - inside the heating unit - and not that the entire tank is drifting up and down noticibly.

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$20.99

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$20.99

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