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 3 (Free Shipping)

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Seapora Quartz Aquarium Heater, 100-watt slide 2 of 2

Seapora Quartz Aquarium Heater, 100-watt

Rated 4 out of 5 stars

7

$21.99 Chewy Price

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

Slide 1 of 6

OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater slide 2 of 6

OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater slide 3 of 6

OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater slide 4 of 6

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OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater

Rated 5 out of 5 stars

1

$44.99 Chewy Price

$49.41 List Price

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Free 1-3 day delivery on first-time orders
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Slide 1 of 4

Zoo Med Aqua Cool Aquarium Cooling Fan slide 2 of 4

Zoo Med Aqua Cool Aquarium Cooling Fan slide 3 of 4

Zoo Med Aqua Cool Aquarium Cooling Fan slide 4 of 4

Zoo Med Aqua Cool Aquarium Cooling Fan

Rated 2.3 out of 5 stars

7

$23.59 Chewy Price

$45.99 List Price

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Free 1-3 day delivery on first-time orders over $35
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Slide 1 of 5

Laguna Pond Heater, 500W

Rated 3.7 out of 5 stars

7

$84.88 Chewy Price

$196.56 List Price

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

Coralife Deep Six Aquarium Hydrometer

Rated 3.4 out of 5 stars

9

$13.99 Chewy Price

$14.99 List Price

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Free 1-3 day delivery on first-time orders over $35
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OASE Indoor Aquatics HeatUp 25 Adjustable Fish Heater

Rated 3.9 out of 5 stars

13

$25.59 Chewy Price

$35.99 List Price

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Free 1-3 day delivery on first-time orders over $35
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K&H Pet Products Thermo-Pond

Rated 3.9 out of 5 stars

39

$63.98 Chewy Price

$98.99 List Price

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Free delivery on first-time orders
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Arrives between Sep 4 and Sep 8

OASE Indoor Aquatics HeatUp 100 Adjustable Fish Heater

Rated 4 out of 5 stars

4

$34.09 Chewy Price

$42.99 List Price

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

Zoo Med BettaTherm Mini Size Betta Bowl Heater

Rated 2.3 out of 5 stars

11

$15.14 Chewy Price

Autoship Price

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

Tetra Pond De-Icer, 300-watt

Rated 4.3 out of 5 stars

97

$51.49 Chewy Price

$73.19 List Price

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Free 1-3 day delivery on first-time orders
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OASE Indoor Aquatics Filtosmart Thermo 200 External Fish Heater

Rated 3.4 out of 5 stars

5

$182.99 Chewy Price

$219.99 List Price

Autoship Price

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

ASF Reef Evolution Hydrometer

$18.99 Chewy Price

$22.99 List Price

Autoship Price

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

OASE Indoor Aquatics Biostyle Thermo 50 Fish Heater, Dark Blue

Rated 3 out of 5 stars

2

$24.99 Chewy Price

$31.24 List Price

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Free 1-3 day delivery on first-time orders over $35
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OASE Indoor Aquatics HeatUp 200 Adjustable Fish Heater

Rated 4.7 out of 5 stars

3

$48.82 Chewy Price

$48.99 List Price

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Free 1-3 day delivery on first-time orders
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JBJ Aquarium C-Breeze Aquarium Cooling Fan

Rated 1 out of 5 stars

1

$45.99 Chewy Price

$60.27 List Price

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Free delivery on first-time orders
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Arrives between Sep 5 and Sep 9

biOrb Aquarium Heater Pack

Rated 5 out of 5 stars

1

$47.99 Chewy Price

$52.99 List Price

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Free delivery on first-time orders
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Arrives between Sep 4 and Sep 8

K&H Pet Products Thermo-Pond Perfect Climate Submersible Pond Deicer

Rated 3.5 out of 5 stars

21

$33.21 Chewy Price

$86.99 List Price

Autoship Price

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

OASE Indoor Aquatics HeatUp 50 Adjustable Fish Heater

Rated 4.8 out of 5 stars

4

$29.99 Chewy Price

$37.99 List Price

Autoship Price

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

OASE Indoor Aquatics Bioplus Thermo 100 Internal Fish Heater

$70.00 Chewy Price

$99.99 List Price

Autoship Price

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

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

Rated 5 out of 5 stars

3

$765.98 Chewy Price

$1167.93 List Price

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Free delivery on first-time orders
Free 365-day returns
Arrives between Sep 5 and Sep 9

OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater

Rated 3 out of 5 stars

2

$65.59 Chewy Price

$94.99 List Price

Autoship Price

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

OASE Indoor Aquatics Filtosmart Thermo 300 External Fish Heater

Rated 3 out of 5 stars

2

$226.99 Chewy Price

$249.99 List Price

Autoship Price

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

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White

Rated 1 out of 5 stars

1

$70.99 Chewy Price

Autoship Price

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

OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater

Rated 4.7 out of 5 stars

22

$319.99 Chewy Price

Autoship Price

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

OASE Indoor Aquatics Bioplus Thermo 200 Internal Fish Heater

Rated 5 out of 5 stars

2

$84.99 Chewy Price

$109.99 List Price

Autoship Price

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

JBJ Aquarium Nano Arctica E-Chiller, White/Black, 10-gal

Rated 4 out of 5 stars

1

$399.99 Chewy Price

($40.00/gl) Price per Unit

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Free delivery on first-time orders
Free 365-day returns
Arrives between Sep 5 and Sep 9

OASE Indoor Aquatics Biomaster Thermo 600 External Fish Heater

Rated 5 out of 5 stars

3

$400.99 Chewy Price

Autoship Price

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

OASE Indoor Aquatics Filtosmart Thermo 100 External Fish Heater

Rated 3.4 out of 5 stars

5

$138.99 Chewy Price

$169.99 List Price

Autoship Price

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

Out of Stock

Hydor Betta Bowl Slim Fish Tank Heater

Rated 3.3 out of 5 stars

12

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

Out of Stock

Hydor Theo Aquarium Fish Heater, Black, 400-watt

Rated 4.3 out of 5 stars

12

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Sep 3 and Sep 7

Out of Stock

Hydor Micro & Mini Aquarium Slim Heater, 15-watt

Rated 3.8 out of 5 stars

36

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Sep 3 and Sep 7

Out of Stock

Atlantic Fish Pond De-Icer

Free delivery on first-time orders
Free 365-day returns
Arrives between Sep 4 and Sep 8

Aquarium & Fish Tank Heaters & Thermometers

Seapora Quartz Aquarium Heater, 100-watt

OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater

Zoo Med Aqua Cool Aquarium Cooling Fan

Laguna Pond Heater, 500W

Coralife Deep Six Aquarium Hydrometer

OASE Indoor Aquatics HeatUp 25 Adjustable Fish Heater

K&H Pet Products Thermo-Pond

OASE Indoor Aquatics HeatUp 100 Adjustable Fish Heater

Zoo Med BettaTherm Mini Size Betta Bowl Heater

Tetra Pond De-Icer, 300-watt

OASE Indoor Aquatics Filtosmart Thermo 200 External Fish Heater

ASF Reef Evolution Hydrometer

OASE Indoor Aquatics Biostyle Thermo 50 Fish Heater, Dark Blue

OASE Indoor Aquatics HeatUp 200 Adjustable Fish Heater

JBJ Aquarium C-Breeze Aquarium Cooling Fan

biOrb Aquarium Heater Pack

K&H Pet Products Thermo-Pond Perfect Climate Submersible Pond Deicer

OASE Indoor Aquatics HeatUp 50 Adjustable Fish Heater

OASE Indoor Aquatics Bioplus Thermo 100 Internal Fish Heater

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

OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater

OASE Indoor Aquatics Filtosmart Thermo 300 External Fish Heater

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White

OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater

OASE Indoor Aquatics Bioplus Thermo 200 Internal Fish Heater

JBJ Aquarium Nano Arctica E-Chiller, White/Black, 10-gal

OASE Indoor Aquatics Biomaster Thermo 600 External Fish Heater

OASE Indoor Aquatics Filtosmart Thermo 100 External Fish Heater

Hydor Betta Bowl Slim Fish Tank Heater

Hydor Theo Aquarium Fish Heater, Black, 400-watt

Hydor Micro & Mini Aquarium Slim Heater, 15-watt

Atlantic Fish Pond De-Icer

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