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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Aqueon Aquatic Flat Heater, 7.5-watt slide 2 of 7

Aqueon Aquatic Flat Heater, 7.5-watt slide 3 of 7

Aqueon Aquatic Flat Heater, 7.5-watt slide 4 of 7

Aqueon Aquatic Flat Heater, 7.5-watt slide 5 of 7

Aqueon Aquatic Flat Heater, 7.5-watt

Rated 3.7 out of 5 stars

56

$14.95 Chewy Price

$17.99 List Price

Autoship Price

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

Slide 1 of 3

H2Pro Titanium Aquarium Heater, 300-watt

Rated 4.3 out of 5 stars

12

$79.99 Chewy Price

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

Slide 1 of 7

SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank slide 2 of 7

SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank slide 3 of 7

SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank slide 4 of 7

SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank slide 5 of 7

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

Rated 4 out of 5 stars

94

$3.99 Chewy Price

$4.99 List Price

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

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Lifegard Digital Thermometer & Hygrometer, Black slide 2 of 6

Lifegard Digital Thermometer & Hygrometer, Black slide 3 of 6

Lifegard Digital Thermometer & Hygrometer, Black slide 4 of 6

Lifegard Digital Thermometer & Hygrometer, Black

Rated 3.2 out of 5 stars

5

$67.47 Chewy Price

Autoship Price

Free delivery on first-time orders
Free 365-day returns
Arrives between Jul 21 and Jul 26

Seapora SmartTemp Dual Digital Aquarium Heater, 100-watt

Rated 5 out of 5 stars

3

$56.26 Chewy Price

$71.99 List Price

Autoship Price

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

Fluval P10 Pre-Set Aquarium Fish Heater

Rated 4.2 out of 5 stars

22

$22.80 Chewy Price

$33.72 List Price

Autoship 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

4

$40.16 Chewy Price

$56.99 List Price

Autoship Price

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

Underwater Treasures Seapora Volt-Control Titanium Grounding Probe

Rated 5 out of 5 stars

1

$12.99 Chewy Price

Autoship Price

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

Aqueon Fish Tank Mini Heater, 10-watt

Rated 5 out of 5 stars

1

$17.95 Chewy Price

$20.99 List Price

Autoship Price

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

Fluval M 200Watt Submersible Fish Heater

Rated 4.3 out of 5 stars

27

$39.99 Chewy Price

Autoship Price

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

K&H Pet Products Thermo-Pond Perfect Climate Deluxe Pond Deicer, 1500 Watt

Rated 3.8 out of 5 stars

116

$45.49 Chewy Price

$91.99 List Price

Autoship Price

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

Fluval E200 Electronic Fish Aquarium Heater, 200-watt

Rated 4 out of 5 stars

4

$69.99 Chewy Price

$71.07 List Price

Autoship Price

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

Tetra HT55 Submersible Aquarium Heater & Electronic Thermostat, 200-watt

Rated 4 out of 5 stars

42

$27.97 Chewy Price

$34.99 List Price

Autoship Price

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

Penn-Plax Aquarium LED Display Heater, 300W

Rated 2.4 out of 5 stars

5

$32.99 Chewy Price

$64.99 List Price

Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 19 and Jul 23

Lifegard Led Digital Thermometer, Blue

Rated 4.4 out of 5 stars

5

$34.49 Chewy Price

Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 21 and Jul 26

Hydor Theo Shatterproof Aquarium Heater, 25-watt

Rated 3.5 out of 5 stars

45

$26.88 Chewy Price

$35.95 List Price

Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 19 and Jul 23

Fluval Sea Aquarium Hydrometer, Medium

Rated 2.5 out of 5 stars

6

$14.64 Chewy Price

$14.99 List Price

Autoship Price

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

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, Dark Blue

Rated 1 out of 5 stars

1

$24.99 Chewy Price

$88.99 List Price

Autoship Price

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

Aquael Platinium Temperature Control Aquarium Heater with Electronic Thermostat, 300W

Rated 4.6 out of 5 stars

23

$37.05 Chewy Price

Autoship Price

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

Aqueon Mini Aquarium Heater, 2-gal, 5 watt

Rated 3.7 out of 5 stars

92

$14.45 Chewy Price

$16.99 List Price

Autoship Price

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

Underwater Treasures Easy Read Fish Thermometer

Rated 2.9 out of 5 stars

14

$10.69 Chewy Price

Autoship Price

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

Zoo Med Digital Aquarium Thermometer

Rated 3.4 out of 5 stars

18

$8.99 Chewy Price

$10.99 List Price

Autoship Price

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

Aquatop Submersible Glass Aquarium Heater, 300-watt

Rated 3.7 out of 5 stars

94

$32.99 Chewy Price

Autoship Price

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

Farm Innovators Convertable Stock Tank De-Icer

Rated 4.6 out of 5 stars

27

$33.74 Chewy Price

$52.99 List Price

Autoship Price

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

Instant Ocean Testing Hydrometer for Aquariums, 1 count

Rated 4 out of 5 stars

38

$11.99 Chewy Price

$13.69 List Price

Autoship Price

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

OASE Indoor Aquatics HeatUp 400 Adjustable Fish Heater

Rated 4.7 out of 5 stars

3

$57.99 Chewy Price

$62.99 List Price

Autoship Price

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

Coralife Deep Six Aquarium Hydrometer

Rated 3.3 out of 5 stars

8

$13.99 Chewy Price

$14.99 List Price

Autoship Price

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

K&H Pet Products Thermo-Pond

Rated 3.9 out of 5 stars

38

$38.38 Chewy Price

$98.99 List Price

Autoship Price

Free delivery on first-time orders
Free 365-day returns
Arrives between Jul 17 and Jul 20

Tetra Pond De-Icer, 300-watt

Rated 4.3 out of 5 stars

97

$51.49 Chewy Price

$73.19 List Price

Autoship Price

Free 1-3 day delivery on first-time orders
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

Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 19 and Jul 23

Aquael Ultra 100W Aquarium Heater

Rated 4 out of 5 stars

19

$57.99 Chewy Price

$74.51 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

$737.08 Chewy Price

$965.22 List Price

Autoship Price

Free delivery on first-time orders
Free 365-day returns
Arrives between Jul 23 and Jul 26

OASE Indoor Aquatics Filtosmart Thermo 200 External Fish Heater

Rated 4 out of 5 stars

4

$163.89 Chewy Price

$219.99 List Price

Autoship 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

$15.70 Chewy Price

Autoship 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

23

$60.12 Chewy Price

$112.59 List Price

Autoship Price

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

Seapora Quartz Aquarium Heater, 100-watt

Rated 4 out of 5 stars

7

$21.99 Chewy Price

Autoship Price

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

Aquarium & Fish Tank Heaters & Thermometers

Aqueon Aquatic Flat Heater, 7.5-watt

H2Pro Titanium Aquarium Heater, 300-watt

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

Lifegard Digital Thermometer & Hygrometer, Black

Seapora SmartTemp Dual Digital Aquarium Heater, 100-watt

Fluval P10 Pre-Set Aquarium Fish Heater

OASE Indoor Aquatics HeatUp 300 Adjustable Fish Heater

Underwater Treasures Seapora Volt-Control Titanium Grounding Probe

Aqueon Fish Tank Mini Heater, 10-watt

Fluval M 200Watt Submersible Fish Heater

K&H Pet Products Thermo-Pond Perfect Climate Deluxe Pond Deicer, 1500 Watt

Fluval E200 Electronic Fish Aquarium Heater, 200-watt

Tetra HT55 Submersible Aquarium Heater & Electronic Thermostat, 200-watt

Penn-Plax Aquarium LED Display Heater, 300W

Lifegard Led Digital Thermometer, Blue

Hydor Theo Shatterproof Aquarium Heater, 25-watt

Fluval Sea Aquarium Hydrometer, Medium

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, Dark Blue

Aquael Platinium Temperature Control Aquarium Heater with Electronic Thermostat, 300W

Aqueon Mini Aquarium Heater, 2-gal, 5 watt

Underwater Treasures Easy Read Fish Thermometer

Zoo Med Digital Aquarium Thermometer

Aquatop Submersible Glass Aquarium Heater, 300-watt

Farm Innovators Convertable Stock Tank De-Icer

Instant Ocean Testing Hydrometer for Aquariums, 1 count

OASE Indoor Aquatics HeatUp 400 Adjustable Fish Heater

Coralife Deep Six Aquarium Hydrometer

K&H Pet Products Thermo-Pond

Tetra Pond De-Icer, 300-watt

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

Aquael Ultra 100W Aquarium Heater

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

OASE Indoor Aquatics Filtosmart Thermo 200 External Fish Heater

Zoo Med BettaTherm Mini Size Betta Bowl Heater

Laguna Power Heat Heated De-Icer, 315W

Seapora Quartz Aquarium Heater, 100-watt

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