Free $30 eGift card with your $100 order

Betta Aquarium Heaters & Thermometers

Underwater Treasures Floating Glass Fish Thermometer

Rated 4.4 out of 5 stars
312
$1.75 Chewy Price
Autoship Price

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

Slide 1 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 1 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 2 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 3 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 4 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 5 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 6 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 7 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 8 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 9 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 1 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 2 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 3 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 4 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 5 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 6 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 7 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 8 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 9 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 1 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 2 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 3 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 4 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 5 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 6 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 7 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 8 of 9
Aqueon Preset Aquarium Heater, 50-watt slide 9 of 9

Aqueon Preset Aquarium Heater, 50-watt

Rated 3.6 out of 5 stars
337
$20.95 Chewy Price
$24.99 List Price
Autoship Price

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

Slide 1 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 1 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 2 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 3 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 4 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 5 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 6 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 1 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 2 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 3 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 4 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 5 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 6 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 1 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 2 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 3 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 4 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 5 of 6
SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-gal slide 6 of 6

SunGrow Submersible Aquarium Heater with Thermostat for Betta & Turtle Tanks, 10-watt, up to 2-...

Rated 4.2 out of 5 stars
194
$11.67 Chewy Price
$13.99 List Price
Autoship Price

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

Slide 1 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 1 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 2 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 3 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 4 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 5 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 6 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 7 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 8 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 9 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 1 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 2 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 3 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 4 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 5 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 6 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 7 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 8 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 9 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 1 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 2 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 3 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 4 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 5 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 6 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 7 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 8 of 9
Fluval Submersible Glass Aquarium Heater, 50-watt slide 9 of 9

Fluval Submersible Glass Aquarium Heater, 50-watt

Rated 4 out of 5 stars
63
$32.99 Chewy Price
$37.22 List Price
Autoship Price

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

Underwater Treasures Digital Fish Thermometer

Rated 4 out of 5 stars
40
$2.55 Chewy Price
Autoship Price

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

HelloReef Stick on Aquarium Thermometer

Rated 4.5 out of 5 stars
8
$4.99 Chewy Price
Autoship Price

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

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

Rated 3.9 out of 5 stars
72
$3.99 Chewy Price
Autoship Price

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

Tetrafauna Aquatic Reptile Aquarium Heater, 100-watt

Rated 3.8 out of 5 stars
91
$29.47 Chewy Price
$34.99 List Price
Autoship Price

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

GloFish Submersible Fish Heater, 50-watts

Rated 4.1 out of 5 stars
23
$17.47 Chewy Price
$22.49 List Price
Autoship Price

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

Marina Betta Submersible Aquarium Heater

Rated 4 out of 5 stars
72
$12.98 Chewy Price
$22.78 List Price
Autoship Price

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

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
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

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

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

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

Hydor Betta & Betta Bowl Slim Heater, 7.5-watt

Rated 3.8 out of 5 stars
41
$15.50 Chewy Price
Autoship Price

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

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

Category

Brand

7 Brands are shown below

Aquarium Type

Fish Type

Product Type

Deals & Savings

Price

Customer Rating