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Freshwater Aquarium Heaters & Thermometers

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Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 1 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 2 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 3 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 4 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 5 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 6 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 7 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 8 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 9 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 1 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 2 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 3 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 4 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 5 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 6 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 7 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 8 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 9 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 1 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 2 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 3 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 4 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 5 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 6 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 7 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 8 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 9 of 9
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Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 1 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 2 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 3 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 4 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 5 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 6 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 7 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 8 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 9 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 1 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 2 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 3 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 4 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 5 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 6 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 7 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 8 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 9 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 1 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 2 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 3 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 4 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 5 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 6 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 7 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 8 of 9
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt slide 9 of 9

Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt

Rated 4.3 out of 5 stars
109
$13.90 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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Underwater Treasures Floating Glass Fish Thermometer

Rated 4.4 out of 5 stars
312
$1.75 Chewy Price
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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
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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

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Fluval M 100Watt Submersible Fish Heater slide 1 of 8
Fluval M 100Watt Submersible Fish Heater slide 2 of 8
Fluval M 100Watt Submersible Fish Heater slide 3 of 8
Fluval M 100Watt Submersible Fish Heater slide 4 of 8
Fluval M 100Watt Submersible Fish Heater slide 5 of 8
Fluval M 100Watt Submersible Fish Heater slide 6 of 8
Fluval M 100Watt Submersible Fish Heater slide 7 of 8
Fluval M 100Watt Submersible Fish Heater slide 8 of 8
Fluval M 100Watt Submersible Fish Heater slide 1 of 8
Fluval M 100Watt Submersible Fish Heater slide 2 of 8
Fluval M 100Watt Submersible Fish Heater slide 3 of 8
Fluval M 100Watt Submersible Fish Heater slide 4 of 8
Fluval M 100Watt Submersible Fish Heater slide 5 of 8
Fluval M 100Watt Submersible Fish Heater slide 6 of 8
Fluval M 100Watt Submersible Fish Heater slide 7 of 8
Fluval M 100Watt Submersible Fish Heater slide 8 of 8
Fluval M 100Watt Submersible Fish Heater slide 1 of 8
Fluval M 100Watt Submersible Fish Heater slide 2 of 8
Fluval M 100Watt Submersible Fish Heater slide 3 of 8
Fluval M 100Watt Submersible Fish Heater slide 4 of 8
Fluval M 100Watt Submersible Fish Heater slide 5 of 8
Fluval M 100Watt Submersible Fish Heater slide 6 of 8
Fluval M 100Watt Submersible Fish Heater slide 7 of 8
Fluval M 100Watt Submersible Fish Heater slide 8 of 8

Fluval M 100Watt Submersible Fish Heater

Rated 4.5 out of 5 stars
35
$35.99 Chewy Price
$39.24 List Price
Autoship Price

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

Penn-Plax Cascade Heat 300W Preset Submersible Aquarium Heater, 12-in

Rated 3.7 out of 5 stars
33
$16.58 Chewy Price
$45.99 List Price
Autoship Price

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

Marina 6-in Submersible Fish Heater, 50-Watts

Rated 3.2 out of 5 stars
12
$14.64 Chewy Price
$41.59 List Price
Autoship Price

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

Fluval Electronic Aquarium Heater, 300-watt

Rated 4.1 out of 5 stars
108
$72.99 Chewy Price
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Free 1-3 day delivery on first-time orders
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Lifegard Adjustable Quartz Glass Heater Electronic Control, 25 watt

Rated 5 out of 5 stars
5
$31.40 Chewy Price
$32.27 List Price
Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 22 and Jul 27

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
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Marina Floating Thermometer with Suction Cup for Aquariums

Rated 4.1 out of 5 stars
272
$3.99 Chewy Price
$5.30 List Price
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Free 1-3 day delivery on first-time orders over $35
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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

Fluval M 300Watt Submersible Fish Heater

Rated 4.2 out of 5 stars
39
$42.99 Chewy Price
$44.08 List Price
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Free 1-3 day delivery on first-time orders
Free 365-day returns

Cobalt Aquatics Neo-Glass Submersible Aquarium Heater, 25-watt

Rated 3.5 out of 5 stars
19
$45.97 Chewy Price
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Free 1-3 day delivery on first-time orders
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
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Free 1-3 day delivery on first-time orders
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Penn-Plax AquaLIFE Therma-Temp Digital Aquarium Thermometer, 2-in

Rated 3.9 out of 5 stars
72
$3.99 Chewy Price
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Free 1-3 day delivery on first-time orders over $35
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Tetrafauna Aquatic Reptile Aquarium Heater, 100-watt

Rated 3.8 out of 5 stars
91
$29.47 Chewy Price
$34.99 List Price
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Free 1-3 day delivery on first-time orders over $35
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Lifegard Pre-Set Quartz Glass Heater Electronic Control, 25 watt

Rated 4.3 out of 5 stars
12
$13.59 Chewy Price
$20.51 List Price
Autoship Price

Free delivery on first-time orders over $35
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Arrives between Jul 22 and Jul 27

Seapora Digital Thermometer with Probe

Rated 4 out of 5 stars
15
$14.28 Chewy Price
$16.99 List Price
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Free 1-3 day delivery on first-time orders over $35
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Fluval M 150Watt Submersible Fish Heater

Rated 4.3 out of 5 stars
10
$36.99 Chewy Price
$38.03 List Price
Autoship Price

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

OASE Indoor Aquatics HeatUp 25 Adjustable Fish Heater

Rated 3.9 out of 5 stars
13
$19.95 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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Fluval Wireless 2-in-1 Digital Fish Thermometer

Rated 4.2 out of 5 stars
29
$21.99 Chewy Price
$30.08 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

Fluval P25 Pre-Set Aquarium Fish Heater

Rated 4.3 out of 5 stars
12
$25.99 Chewy Price
$32.47 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

H2Pro Titanium Aquarium Heater, 300-watt

Rated 4.3 out of 5 stars
12
$79.99 Chewy Price
Autoship Price

Free 1-3 day delivery on first-time orders
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

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 22 and Jul 27

Seapora SmartTemp Dual Digital Aquarium Heater, 100-watt

Rated 5 out of 5 stars
3
$56.26 Chewy Price
$71.99 List Price
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Free 1-3 day delivery on first-time orders
Free 365-day returns

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