Aqueon Glass Adjustable Aquarium Heater, 100-watt

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$38.99 (-22%) Chewy Price
$49.99 List Price
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About This Item

Details

  • Perfect for easily maintaining the ideal water temperature for both healthy salt and freshwater community fish tanks.
  • Available in a wide range of the most common wattage sizes to provide a custom heating experience for any aquarium.
  • Precise temperature dial from 68 to 88 °F allows for complete control of aquatic climate within a 1-degree difference.
  • Durable shatter-resistant heater construction allows for completely submersible and safe aquarium temperature control.
  • Convenient power indicator light tells you when water is being heated, and the automatic shut-off feature helps ensure your fishes' safety.
Learn More About Aqueon From Our Team of Experts

Reliable Heaters for Every Aquarium

Create a comfortable and healthy home for your fish with Aqueon’s range of aquarium heaters. From Submersible Glass Heaters to Mini Aquarium Heaters and Aquatic Flat Heaters, Aqueon offers a variety of options to suit any tank size or setup.

All About the Fish

Aqueon strives to do what’s best for the health and well-being of fish and aquatic life. They focus on the little things that make your life easier when keeping an aquarium, so it’s easier to keep your fish happy and healthy.

Hassle-Free Heating

Aqueon Preset Aquarium Heaters are the ultimate solution for easy temperature control. Calibrated to a preset temperature of 78°F with automatic safety shutoff, the heater is fully submersible and constructed of shatter-resistant quartz glass.

Find the Right Heater for Your Tank

Aqueon offers a variety of heater options to accommodate all aquarium sizes. Choose from lower-wattage heaters for small tanks, 100-watt and 200-watt heaters for medium-sized tanks and 300-watt heaters for large aquariums.

About Aqueon

Developed by Aquatic hobbyists, Aqueon provides a broad array of aquarium solutions to help maintain healthy aquatic environments.

Shop Aqueon

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Questions & Answers

12 Customer Questions

How many watts should I need for a 10 gallon?

Answer by Chewy • Oct 24, 2019
Please refer to the picture chart below.

Does this have a built in thermostat to make sure the temperature is constant

Answer by Chewy • Sep 12, 2019
This heater features a precise temperature dial from 68°F to 88°F which allows for complete control of aquatic climate within a 1-degree difference. It does not include a built in thermometer and will need to be purchased separately.

can the 50 watt be safely used in a 3 gallon fish tank?

Answer by Chewy • Mar 21, 2019
The 50 watt can be used in 3 gallon tanks and tanks up to 20-gallons. To ensure it will fit, compare the dimensions of your tank to the measurements of the heater which are 1.375 x 1.375 x 8.75 inches.

can I use two 50watt heater in my 20g tank?

Answer by Chewy • Apr 03, 2021
The 50w heater is rated for tanks up to 20 gallons. If you choose to use (2) 50w heaters or even a 100w heater, there wouldn’t be any issue. Just be sure when using 2 heaters, have them on opposite ends of eachother, not close together.
Reviews
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3.8
Rated 3.8 out of 5 stars
91 Ratings
Terms & Conditions

70 Customer Reviews

Rated 1 out of 5 stars
By Heavenly on Sep 7, 2025

Didnt work out of box

No visable damage to heater or box. I have never had a problem with any of my aquaeon products. I love aquaeon. But this heater. Ugh. I pulled it out of box. Put

No visable damage to heater or box. I have never had a problem with any of my aquaeon products. I love aquaeon. But this heater. Ugh. I pulled it out of box. Put it in the tank. Let it submerge 30 minutes or so and then plugged it in. The light flickered and never came back on. I left it plugged in for at least 4 hours and it never came on even though the water cooled enough that it should have turned on.

Rated 4 out of 5 stars
By Chasity on Nov 15, 2025

Works well enough

Only lasts maybe a couple yrs and have to get another one.

Only lasts maybe a couple yrs and have to get another one.

Rated 5 out of 5 stars
By RICH on Feb 2, 2025

Aqueon steps up to the plate.

I did use the Pro model heater that had green and red indicator lights. Still have them. Did Not like their newer Pro model with the dull indicator light in the

I did use the Pro model heater that had green and red indicator lights. Still have them. Did Not like their newer Pro model with the dull indicator light in the adjustment knob. This latest glass heater has a nice bright red indicator light. VG

Rated 5 out of 5 stars
By Paul on Dec 1, 2024

Works great!

Bought this heater several years ago and it did its job, so I’m sticking with it. Also it’s a great value for the price.

Bought this heater several years ago and it did its job, so I’m sticking with it. Also it’s a great value for the price.

Rated 5 out of 5 stars
By Betty on May 20, 2024

Just what I needed

I’ve been wanting to have a heater that I could adjust the temperature. But, they were always too long. This one fits perfectly in my smaller aquariums and the temp

I’ve been wanting to have a heater that I could adjust the temperature. But, they were always too long. This one fits perfectly in my smaller aquariums and the temp stays true to its setting. Bought 3 and am very pleased!

Rated 3 out of 5 stars
By Meredith on Mar 11, 2024

I wish it had a longer life for me

I really liked this heater for the short time it worked-- about 4 months. I sized up in the wattage compared to my tank size with the intention not to overwork

I really liked this heater for the short time it worked-- about 4 months. I sized up in the wattage compared to my tank size with the intention not to overwork the heater to maintain the right temperature in the tank. This morning I found the tank temperature had dropped by 20 degrees (!) and the heater wasn't working. I'm going to try a different brand next and hopefully the heating element holds up longer.

Rated 2 out of 5 stars
By Laurie on Jan 20, 2024

Cooked my fish

Set the heater at 72 when I went to bed and when I woke up it was at 85!!!! Unplugged it immediately but I lost almost my entire 20 gallon tank. Only survivor is

Set the heater at 72 when I went to bed and when I woke up it was at 85!!!! Unplugged it immediately but I lost almost my entire 20 gallon tank. Only survivor is the betta:(

Rated 3 out of 5 stars
By 300watt on Jul 21, 2023

not for big tanks

I had to buy a second heater for my 55 gallon tank because it didn’t adequately heat. I’m sure if would be ok for small tanks though.

I had to buy a second heater for my 55 gallon tank because it didn’t adequately heat. I’m sure if would be ok for small tanks though.

Rated 5 out of 5 stars
By Vika7 on Jun 2, 2023

Great heater

Best heater I’ve ever used and I’ve tried many! Use the 50 watt for a 20 gallon long Betta tank. Keeps water at perfect 79 degrees.

Best heater I’ve ever used and I’ve tried many! Use the 50 watt for a 20 gallon long Betta tank. Keeps water at perfect 79 degrees.

Rated 1 out of 5 stars
By junk on Mar 15, 2023

only worked for two days

This is by far the worst heater I have ever invested in. I placed it in a 75 gallon saltwater aquarium two days ago checked this morning and it is completely full

This is by far the worst heater I have ever invested in. I placed it in a 75 gallon saltwater aquarium two days ago checked this morning and it is completely full of water and has put toxic chemicals inside of my salt water tank killing all fish. Do not buy!!