What are fish tank heaters?

Fish tank heaters are underwater devices that maintain a desired temperature for your pet fish and surrounding aquatic life. To do this, heaters usually possess a thermostat. The thermostat monitors the water temperature, turning the heater on and off to maintain its optimal setting.

Are tank heaters safe for fish?

Yes, tank heaters are usually safe for fish, primarily because fish require stable water temperatures to survive. Many fish are cold-blooded by nature, so they depend on outside sources of heat to help in maintaining their body temperature.

Do aquarium heaters use a lot of electricity?

Aquarium heaters can use a good bit of energy, but the amount depends on several factors. These factors include: heater wattage, size of tank, heater cycling, filters, pumps, and lighting. Purchasing energy-efficiency tank equipment can help offset the electricity costs in many cases.

Do you leave a fish tank heater on all the time?

It's important that fish tank heaters be left on all the time. A heater is monitored by its thermostat, so it automatically turns on and off to maintain a consistent water temperature. That consistent water temperature is vital to the health of fish and underwater plants.

Aquarium & Fish Tank Heaters & Thermometers - Page 2 (Free Shipping)

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Hydor Micro & Mini Aquarium Slim Fish Heater, Black, 15-watt slide 2 of 4

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

Rated 4.3 out of 5 stars

9

$15.29 Chewy Price

Free delivery on first-time orders over $35
Free 365-day returns

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GloFish Submersible Fish Heater, 50-watts slide 2 of 7

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GloFish Submersible Fish Heater, 50-watts

Rated 4.3 out of 5 stars

20

$17.47 Chewy Price

$22.49 List Price

Free 1-3 day delivery on first-time orders over $35
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Aqueon Mini Aquarium Heater, 2-gal, 5 watt slide 2 of 8

Aqueon Mini Aquarium Heater, 2-gal, 5 watt slide 3 of 8

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Aqueon Mini Aquarium Heater, 2-gal, 5 watt

Rated 3.7 out of 5 stars

87

$15.99 Chewy Price

$16.99 List Price

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Tetra HT40 Submersible Aquarium Heater & Electronic Thermostat, 150-watt slide 2 of 5

Tetra HT40 Submersible Aquarium Heater & Electronic Thermostat, 150-watt slide 3 of 5

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

Rated 3.2 out of 5 stars

19

$23.97 Chewy Price

$29.99 List Price

Free 1-3 day delivery on first-time orders over $35
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Seapora SmartTemp Dual Digital Aquarium Heater, 200-watt

Rated 5 out of 5 stars

2

$58.61 Chewy Price

$76.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Fluval M 150Watt Submersible Fish Heater

Rated 4.1 out of 5 stars

7

$34.99 Chewy Price

$35.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Laguna Power Heat Heated De-Icer, 315W

Rated 4.3 out of 5 stars

15

$62.89 Chewy Price

$90.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Penn-Plax 25W Plastic Safe Aquarium Heater, 6-in

$13.95 Chewy Price

$39.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Fluval P25 Pre-Set Aquarium Fish Heater

Rated 3.8 out of 5 stars

5

$22.99 Chewy Price

$29.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

OASE Indoor Aquatics HeatUp 300 Adjustable Fish Heater

Rated 5 out of 5 stars

2

$41.59 Chewy Price

$56.99 List Price

Free 1-3 day delivery on first-time orders
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Aquatop Nano Aquarium Thermostat Heater, 15-watt

Rated 2.9 out of 5 stars

15

$25.99 Chewy Price

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Hydor Theo Aquarium Fish Heater, Black, 150-watt

Rated 4.4 out of 5 stars

8

$31.79 Chewy Price

$47.99 List Price

Free delivery on first-time orders over $35
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OASE Indoor Aquatics HeatUp 200 Adjustable Fish Heater

Rated 4.5 out of 5 stars

2

$32.89 Chewy Price

$48.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Marina 10.5-in Submersible Fish Heater, 150-Watts

Rated 4.2 out of 5 stars

6

$27.99 Chewy Price

$39.99 List Price

Free 1-3 day delivery on first-time orders over $35
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Coralife Deep Six Aquarium Hydrometer

Rated 3 out of 5 stars

7

$13.99 Chewy Price

$14.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Seapora Quartz Aquarium Heater, 200-watt

Rated 4 out of 5 stars

5

$23.85 Chewy Price

$23.99 List Price

Free 1-3 day delivery on first-time orders over $35
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Hydor Betta & Betta Bowl Slim Heater, 7.5-watt

Rated 3.9 out of 5 stars

39

$17.16 Chewy Price

Free delivery on first-time orders over $35
Free 365-day returns

Laguna Pond Heater, 500W

Rated 3 out of 5 stars

4

$84.95 Chewy Price

$153.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics Digital Fish Thermometer

Rated 3.7 out of 5 stars

3

$19.99 Chewy Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

JBJ Aquarium Arctica Titanium Auqarium Chiller, 1/4-hp

Rated 5 out of 5 stars

3

$965.22 Chewy Price

Free delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics Biomaster Thermo 600 External Fish Heater

Rated 5 out of 5 stars

2

$394.97 Chewy Price

$400.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Fluval Sea Aquarium Hydrometer, Medium

Rated 2.5 out of 5 stars

6

$11.55 Chewy Price

$14.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Hydor Theo Shatterproof Aquarium Heater, 50-watt

Rated 3.5 out of 5 stars

42

$35.28 Chewy Price

$38.95 List Price

Free delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics HeatUp 400 Adjustable Fish Heater

Rated 4.5 out of 5 stars

2

$61.26 Chewy Price

$62.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater

Rated 5 out of 5 stars

1

$42.99 Chewy Price

$44.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Zoo Med BettaTherm Mini Size Betta Bowl Heater

Rated 2.3 out of 5 stars

11

$21.43 Chewy Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Seapora Mini Desktop Aquarium Heater, 30-watt

Rated 2 out of 5 stars

1

$13.99 Chewy Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Penn-Plax 10W Plastic Safe Aqiuarium Heater, 4-in

Rated 3.2 out of 5 stars

6

$25.99 Chewy Price

$27.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater

Rated 4.7 out of 5 stars

20

$319.99 Chewy Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics HeatUp 50 Adjustable Fish Heater

Rated 4.8 out of 5 stars

4

$29.17 Chewy Price

$37.99 List Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White

Rated 1 out of 5 stars

1

$39.99 Chewy Price

$70.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics Filtosmart Thermo 300 External Fish Heater

$226.77 Chewy Price

$249.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics Biostyle Thermo 50 Fish Heater, White

$98.99 Chewy Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater

Rated 3 out of 5 stars

2

$81.99 Chewy Price

$94.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, Dark Blue

Rated 1 out of 5 stars

1

$88.99 Chewy Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

OASE Indoor Aquatics Filtosmart Thermo 200 External Fish Heater

Rated 5 out of 5 stars

1

$193.99 Chewy Price

$219.99 List Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Aquarium & Fish Tank Heaters & Thermometers

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

GloFish Submersible Fish Heater, 50-watts

Aqueon Mini Aquarium Heater, 2-gal, 5 watt

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

Seapora SmartTemp Dual Digital Aquarium Heater, 200-watt

Fluval M 150Watt Submersible Fish Heater

Laguna Power Heat Heated De-Icer, 315W

Penn-Plax 25W Plastic Safe Aquarium Heater, 6-in

Fluval P25 Pre-Set Aquarium Fish Heater

OASE Indoor Aquatics HeatUp 300 Adjustable Fish Heater

Aquatop Nano Aquarium Thermostat Heater, 15-watt

Hydor Theo Aquarium Fish Heater, Black, 150-watt

OASE Indoor Aquatics HeatUp 200 Adjustable Fish Heater

Marina 10.5-in Submersible Fish Heater, 150-Watts

Coralife Deep Six Aquarium Hydrometer

Seapora Quartz Aquarium Heater, 200-watt

Hydor Betta & Betta Bowl Slim Heater, 7.5-watt

Laguna Pond Heater, 500W

OASE Indoor Aquatics Digital Fish Thermometer

JBJ Aquarium Arctica Titanium Auqarium Chiller, 1/4-hp

OASE Indoor Aquatics Biomaster Thermo 600 External Fish Heater

Fluval Sea Aquarium Hydrometer, Medium

Hydor Theo Shatterproof Aquarium Heater, 50-watt

OASE Indoor Aquatics HeatUp 400 Adjustable Fish Heater

OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater

Zoo Med BettaTherm Mini Size Betta Bowl Heater

Seapora Mini Desktop Aquarium Heater, 30-watt

Penn-Plax 10W Plastic Safe Aqiuarium Heater, 4-in

OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater

OASE Indoor Aquatics HeatUp 50 Adjustable Fish Heater

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White

OASE Indoor Aquatics Filtosmart Thermo 300 External Fish Heater

OASE Indoor Aquatics Biostyle Thermo 50 Fish Heater, White

OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, Dark Blue

OASE Indoor Aquatics Filtosmart Thermo 200 External Fish Heater

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