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Saltwater Aquarium Heaters

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Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 1 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 2 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 3 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 4 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 5 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 6 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 7 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 8 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 9 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 1 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 2 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 3 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 4 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 5 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 6 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 7 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 8 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 9 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 1 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 2 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 3 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 4 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 5 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 6 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 7 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 8 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 9 of 9
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Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 1 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 2 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 3 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 4 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 5 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 6 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 7 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 8 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 9 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 1 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 2 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 3 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 4 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 5 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 6 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 7 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 8 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 9 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 1 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 2 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 3 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 4 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 5 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 6 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 7 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 8 of 9
Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt slide 9 of 9

Pawshelf Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in,...

Rated 4.4 out of 5 stars
134
$23.99 Chewy Price
$35.99 List Price
Autoship Price

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

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

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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

Eheim Thermocontrol E Fish Aquarium Heater, 300 W

Rated 4.4 out of 5 stars
45
$59.99 Chewy Price
$82.28 List Price
Autoship Price

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

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

JBJ Aquarium Truetemp Titanium Aquarium Heater, Black, 500-watt

$126.00 Chewy Price
Autoship Price

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

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

Rated 4.1 out of 5 stars
140
$15.27 Chewy Price
$18.89 List Price
Autoship Price

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

Marineland Precision Heater, 300 Watt

Rated 3.3 out of 5 stars
116
$41.47 Chewy Price
$51.79 List Price
Autoship Price

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

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

Aqueon Pro Aquarium Heater, 100 watt

Rated 3.8 out of 5 stars
118
$62.95 Chewy Price
$74.95 List Price
Autoship Price

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

Fluval Electronic Aquarium Heater, 300-watt

Rated 4.1 out of 5 stars
108
$72.99 Chewy Price
Autoship Price

Free 1-3 day delivery on first-time orders
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

Aquatop Nano Aquarium Thermostat Heater, 15-watt

Rated 2.9 out of 5 stars
15
$12.99 Chewy Price
$25.99 List Price
Autoship Price

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

Marina Floating Thermometer with Suction Cup for Aquariums

Rated 4.1 out of 5 stars
272
$3.99 Chewy Price
$5.30 List Price
Autoship Price

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

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

Rated 3.3 out of 5 stars
20
$23.97 Chewy Price
$29.99 List 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

Aqueon Glass Adjustable Aquarium Heater, 50-watt

Rated 3.9 out of 5 stars
95
$37.95 Chewy Price
$46.99 List Price
Autoship Price

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

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

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

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 20 and Jul 24

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

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

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

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

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

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 24 and Jul 27

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

biOrb Aquarium Heater Pack

Rated 5 out of 5 stars
1
$47.99 Chewy Price
$52.99 List Price
Autoship Price

Free delivery on first-time orders
Free 365-day returns
Arrives between Jul 20 and Jul 26

Zoo Med Aqua Cool Aquarium Cooling Fan

Rated 2.3 out of 5 stars
7
$23.59 Chewy Price
$45.99 List Price
Autoship Price

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

Aquatop Floating Glass Thermometer with Suction Cup Mount

Rated 1 out of 5 stars
1
$3.99 Chewy Price
$8.46 List Price
Autoship Price

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

Aquatop Smart-Temp Thermometer with Magnet Mount

Rated 4.5 out of 5 stars
2
$7.99 Chewy Price
Autoship Price

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

Out of Stock

Eheim Jager Thermostat Aquarium Heater, 250-watt

Rated 4.3 out of 5 stars
176

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

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