Fish Tank & Aquarium Heaters

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Eheim Jager Thermostat Aquarium Heater, 100-watt

Rated 4.0448 out of 5 stars
67
$20.79Chewy Price

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Aqueon Preset Aquarium Heater, 100-watt

Rated 3.3178 out of 5 stars
214
$10.99Chewy Price
$25.99List Price

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Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt

Rated 4.0909 out of 5 stars
11
$17.19Chewy Price
$33.99List Price

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Marineland Precision Heater, 300 Watt

Rated 2 out of 5 stars
50
$24.95Chewy Price
$45.69List Price

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Underwater Treasures Floating Glass Fish Thermometer

$1.75Chewy Price

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Marina Floating Thermometer with Suction Cup for Aquariums

Rated 3.745 out of 5 stars
149
$4.48Chewy Price

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HDE LCD Digital Aquarium Thermometer

Rated 3.6667 out of 5 stars
108
$9.84Chewy Price
$9.99List Price

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Cobalt Aquatics Neo-Therm PRO Submersible Aquarium Heater, 200-Watt

Rated 3.6818 out of 5 stars
22
$108.35Chewy Price
$123.92List Price

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Fluval Submersible Glass Aquarium Heater, 50-watt

Rated 3.6857 out of 5 stars
35
$15.95Chewy Price
$34.99List Price

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Eheim Thermocontrol E Fish Aquarium Heater, 300 W

Rated 4.3333 out of 5 stars
6
$52.93Chewy Price
$69.99List Price

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Tetra HT30 Submersible Aquarium Heater & Electronic Thermosat, 100-watt

Rated 2.5238 out of 5 stars
21
$10.99Chewy Price
$21.99List Price

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Lifegard Aquatics E-Z Read Pond Thermometer

Rated 1 out of 5 stars
1
$19.05Chewy Price

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Aqueon Pro Aquarium Heater, 300 watt

Rated 3.5625 out of 5 stars
80
$54.95Chewy Price
$69.99List Price

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Penn-Plax AquaLIFE Therma-Temp Digital Aquarium Thermometer, 2-in

Rated 3.0833 out of 5 stars
24
$3.51Chewy Price

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OASE Indoor Aquatics HeatUp 50 Adjustable Fish Heater

$23.51Chewy Price
$35.99List Price

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SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5...

Rated 3.8519 out of 5 stars
27
$8.90Chewy Price
$13.99List Price

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Bundle: Fish Starter Kit - Frisco Betta Aquarium, Aqueon Betta Food, Water Care, Heater

Rated 1 out of 5 stars
2
$43.12Chewy Price
$48.49List Price

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Marina Betta Submersible Aquarium Heater

Rated 4 out of 5 stars
60
$17.00Chewy Price
$17.99List Price

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Hydor Betta & Betta Bowl Slim Fish Heater, 7.5-watt, Black

$39.99Chewy Price

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Aquascape Submersible Fish Pond Thermometer

$12.98Chewy Price

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GloFish Submersible Fish Heater, 50-watts

Rated 2 out of 5 stars
1
$12.52Chewy Price
$20.59List Price

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Tetra HT40 Submersible Aquarium Heater & Electronic Thermostat, 150-watt

Rated 2.3333 out of 5 stars
9
$16.99Chewy Price
$27.99List Price

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Aquatop Nano Aquarium Thermostat Heater, 15-watt

Rated 2.8667 out of 5 stars
15
$25.99Chewy Price

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Aqueon Mini Aquarium Heater, 2-gal, 5 watt

Rated 3.3818 out of 5 stars
55
$11.88Chewy Price
$16.99List Price

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Penn-Plax Cascade Heat 300W Preset Submersible Aquarium Heater, 12-in

Rated 2.2857 out of 5 stars
7
$17.99Chewy Price
$35.99List Price

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OASE Indoor Aquatics HeatUp 400 Adjustable Fish Heater

$59.99Chewy Price

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SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank, W...

Rated 3 out of 5 stars
8
$2.99Chewy Price
$4.99List Price

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Bundle: Fish Starter Kit - Frisco Betta Aquarium, Aqueon Betta Food, Heater, Conditioner, Water...

Rated 1 out of 5 stars
3
$48.75Chewy Price
$54.49List Price

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H2Pro Titanium Aquarium Heater, 500-watt

Rated 2.3333 out of 5 stars
3
$89.99Chewy Price

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Hydor Micro & Mini Aquarium Slim Fish Heater, Black, 15-watt

$44.99Chewy Price

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Zoo Med BettaTherm Mini Size Betta Bowl Heater

Rated 1 out of 5 stars
7
$15.79Chewy Price

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Eheim Thermocontrol Aquarium Water Temperature Controller, 125-watt

Rated 3 out of 5 stars
2
$30.99Chewy Price
$44.99List Price

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Tetra HT10 Submersible Aquarium Heater & Electronic Thermostat, 50-watt

Rated 3.2545 out of 5 stars
55
$11.99Chewy Price
$19.99List Price

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Aquatop External Digital Dual Temp Display Thermometer

$32.99Chewy Price

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Aqueon Aquatic Flat Heater, 7.5-watt

Rated 3.1304 out of 5 stars
23
$7.25Chewy Price
$17.99List Price

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Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 7-in, 25-watt

Rated 3.5 out of 5 stars
4
$8.60Chewy Price
$26.99List Price

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Fish Tank & Aquarium Heaters

Taking care of your aquarium can be much easier with the right tools and basic knowledge. It's important to know what makes a tank suitable for fish and plants to remain happy and healthy. The water may look and feel pristine, but that doesn't mean your temperature is where it should be for healthy aquarium inhabitants. To maintain the best conditions for fish and plant life, check out our selection of quality aquarium heaters and aquarium thermometers. Aquarium thermometers are the perfect asset for monitoring the exact temperature of your tank. This will help you take proper action to set your temperature exactly where your aquarium needs to be. A fish tank thermometer usually reads in both Celsius and Fahrenheit. The ideal water temperature may vary depending on the particular fish, but the average range is between 74 to 82 degrees Fahrenheit (23 to 28 degrees Celsius). If you're looking for a simple aquarium thermometer, try the Marina Floating Thermometer. This product is great for both freshwater and saltwater tanks, and it has a marker to show the safety zone for most tropical fish. It's designed to easily float in the water, or it can be suctioned to the aquarium wall if preferred. It's also imperative to look into aquarium heaters, especially for when it's colder out. The EHEIM Jager Aquarium Thermostat Heater is ideal for marine and freshwater fish. What makes this fish tank heater extremely versatile is the fact you can use it for starting tanks all the way up to 16 gallon aquariums. If you're looking for something that you don't need to make any manual adjustments for, the Marina Submersible Aquarium Heater is programmed to reach a set temperature of 78 degrees. This heater is great for all fish and you can choose either a 10-watt heater that is ideal for tanks up to 2.65 gallons, or the 25-watt heater that will maintain tanks up to 6.6 gallons. When it comes to temperature, it is essential to adjust as needed to ensure your fish and plants stay in tip-top shape. Chewy carries all different types depending on your fish tank needs.

Related Categories: Aquarium Light Fixtures, Aquarium Replacement Bulbs, Aquarium Accessories, Fish Heating and Lighting

Frequently Asked Questions about Fish Tank & Aquarium Heaters

Do fish tanks need heaters?

Some fish tanks need heaters, while others do not. Coldwater fish do not require a fish tank heater, but tropical fish do need aquarium heaters to maintain the right water temperature.

Can you leave aquarium heaters on at all times?

You can usually leave aquarium heaters on at all times, as most have an internal thermostat that turns off the heat when the water reaches a specific temperature. Be sure to read and follow all the instructions for your particular fish tank water heater, including whether to leave it on constantly and how to properly adjust the water temperature.

Where is the best place to put an aquarium heater?

The best place to put an aquarium heater is near a filter outlet or inlet or near a circulation pump. This will help ensure more even heat distribution. Install the heater according to the product instructions and try to position decorations away from the heater so the heated water can circulate more freely.

How do I choose the right aquarium heater for my fish tank?

Choose the right aquarium heater for your fish tank by picking one that has the right amount of heating power for your tank. A good rule of thumb is 5 watts of heat per gallon of tank capacity if you have a tank lid and keep the aquarium in a room that isn't too cold. Many experts recommend choosing a fully submersible heater for greater placement versatility and a compact design that is easier to hide. Read aquarium heater product descriptions and reviews on our site to find out which ones might be best for your particular needs.