Aqueon Mini Aquarium Heater, 2-gal, 5 watt

By Aqueon
Rated 3.3818 out of 5 stars
$12.45Chewy Price
$16.99Chewy Price

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About This Item


  • Specifically designed for desktop aquariums that can hold between half a gallon to two gallons of water.
  • Fully submersible mini heater helps keep water warm.
  • Easy to install—use the included suction cups to place the heater vertically or horizontally.
  • Shatterproof heater is especially perfect for small tropical fish.
  • Measures 1.1"L x .875"W x 3.1"H.

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Learn More About Aqueon From Our Team of Experts

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This Item – Aqueon Mini Aquarium Heater, 2-gal, 5 watt
Rated 3.3818 out of 5 stars
$12.45Chewy Price

Save Extra 30% Off at Checkout

Total Price: $20.44

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Fish TypeMarine Fish, Tropical FreshwaterBetta, Cichlid, Goldfish, Marine Fish, Tropical FreshwaterBetta, Cichlid, Goldfish, Marine Fish, Tropical FreshwaterTropical FreshwaterBetta, Goldfish, Marine Fish...
Aquarium TypeSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, FreshwaterFreshwaterFreshwater
Capacity (Max)2-gal

Questions & Answers

15 Customer Questions

Does this device need to be plugged into electric socket?
Answer by ChewyAug 16, 2019
This mini heater does need to be plugged into an electrical socket.

Does the heater automatically shut off when water is right temperature
Answer by ChewySep 21, 2020
This heater does not have a preset temperature. It will keep your tank around 6 to 8 degrees above room-temperature.

How do I know its on? There is no light.
Answer by ChewySep 06, 2020
As a precaution, we always recommend using a thermometer to check your water temperature. The unit is equipped with a thermal cut-off safety fuse that will turn the heater off automatically if the unit overheats such as by being left out of the aquarium.

Can this be used in an acrylic tank?
Answer by ChewyJul 17, 2019
This heater is suitable for glass and acrylic tanks.

ReviewsWrite a Review

Rated 3.3818 out of 5 stars
55 Ratings
Would recommend to a friend

55 Customer Reviews

Rated 5 out of 5 stars
By Andy on Jan 15, 2023

Mini Heater a life saver

My house has been pretty cold this season. My furnace is on the blink and new one will take a few weeks. I'm dressing warmer, furry pets have sweaters and heated beds but my Betta was looking sad, hanging out at the bottom of his 1.5 gal. bowl, not active, loosing color. I put the 5 watt heat in & it made a huge difference. Beautiful Finneas is now swimming around, eating better and loves to lay on his Betta Bed Fish hammock (also from Chewy-best 3 bucks I've spent-feel bad I didn't know about these for my prior Bettas) near the heat source. Make sure to get the correct wattage for the size of the fish aquarium/bowl.

Rated 1 out of 5 stars
By deadfishmom on Mar 7, 2023

fried my fish

Came home from 2 days away and all that was left was bones. The water was so hot! I feel terrible!

Rated 2 out of 5 stars
By Val on Nov 14, 2022

My mistake

I was browsing the different heaters for small aquariums. I had intended to get a larger one, but ended up with this one by mistake. Even so, I decided to move forward with heaters that have a set temperature, rather than these vague little things.

Rated 3 out of 5 stars
By Glen on Oct 2, 2022

It works Fairly well.

I have this on a 2 gallon betta tank and it works okay, it's just very dependent on what the temperature in the room is as to what the temperature in the tank is, the water temperature is about six degrees warmer than the room temperature. It also lacks an on/off indicator light.

Rated 1 out of 5 stars
By Adela on Jun 22, 2022

Caution When Using

I purchased this from a physical store for a new 2.5 gallon tank. I was wary because of reviews. 3 days after setting it up, I had to unplug it. The temperature in the water had hit 88 degrees. Thankfully no fish were In the tank since I am cycling it. After about 6 hours the water temp had dropped, and I plugged it back in. Unplugged it again the next day as the water temp jumped up to 88 again. The heater is clearly not shutting off when it should. I live in a warm climate, and thankfully I do not need to use it right now, since the room temperature is keeping the water temp where it needs to be.

Rated 5 out of 5 stars
By JansM on Jan 17, 2022

Works as expected.

I read a bunch of reviews of this before buying which seemed to be hit-or-miss. I'm using it on a planted 1-gallon shrimp jar in Wisconsin, January. No filter or other circulation. Took it from about 68 to about 80 in about 10 hours. Seems to hover there fairly consistently. Fluctuates a few degrees based on ambient room temp. Works well so far but I've only had it a week.

Rated 1 out of 5 stars
By Jayda on Dec 23, 2021

Do not get !!!!

it has been plugged in for hours and no sign of temperature change, you cannot tell if it is working due to it not having a light or anything to tell if it is on or not. My betta fish, Cap, is new to my family and I noticed the water was cold and causing him to not eat. So I bought this heater in order to warm him up and it has not changed the temperature at all.

Rated 4 out of 5 stars
By DrFauci on Dec 8, 2021

Heater needed

We needed a little heater asap for my daughters 2 gallon desk tank. We got her a betta as a "Hurray!" gift for getting her vaccine and didn't realize how cold the water got in the tank after a few hours. Bettas like warm water so we went online and purchased one that night. We got the heater within 24 hours and warmed the tank up within 30 minutes of getting it.

Rated 1 out of 5 stars
By Macscrap on Nov 1, 2021

Does not work! Can’t give ZERO STARS!

I’ve had to take it out of my betta’s 2 gal tank after it took the water temp from 74 to 84 overnight. Through additional testing with no fish in another tank, the water temp is now at 91 and still climbing. This would have killed my fish. It seems the safety does not work.

Rated 1 out of 5 stars
By haley on Nov 7, 2021

Don’t buy it.

I bought three heaters for my three betta fish. But every one of the thermometers is below the safe range. My fish don’t like to move anymore. I have to buy the new heater again. Don't waste your money.