Freshwater Aquarium Heaters & Thermometers

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Slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 2 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 3 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 4 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 5 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 6 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 7 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 8 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 2 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 3 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 4 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 5 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 6 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 7 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 8 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 2 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 3 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 4 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 5 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 6 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 7 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 8 of 8
Slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 2 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 3 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 4 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 5 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 6 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 7 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 8 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 2 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 3 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 4 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 5 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 6 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 7 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 8 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 1 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 2 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 3 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 4 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 5 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 6 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 7 of 8
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt slide 8 of 8

Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 200-watt

Rated 4.2 out of 5 stars
97
$18.99 Chewy Price
$42.99 List 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
246
$1.75 Chewy Price

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

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

SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5...

Rated 4.2 out of 5 stars
175
$8.85 Chewy Price
$13.99 List Price

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

Slide 1 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 1 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 2 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 3 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 4 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 5 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 6 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 7 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 8 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 9 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 1 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 2 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 3 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 4 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 5 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 6 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 7 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 8 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 9 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 1 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 2 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 3 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 4 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 5 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 6 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 7 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 8 of 9
Aqueon Preset Aquarium Heater, 100-watt slide 9 of 9

Aqueon Preset Aquarium Heater, 100-watt

Rated 3.6 out of 5 stars
325
$20.82 Chewy Price
$32.99 List Price

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

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

Rated 4.1 out of 5 stars
125
$15.27 Chewy Price
$18.89 List Price

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

Fluval M 100Watt Submersible Fish Heater

Rated 4.6 out of 5 stars
25
$32.99 Chewy Price
$35.99 List 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 4.3 out of 5 stars
35
$51.09 Chewy Price
$69.99 List Price

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

Aquael Platinium 250W Glass Heater

Rated 4.6 out of 5 stars
19
$33.99 Chewy Price
$35.96 List 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
253
$3.99 Chewy Price
$4.48 List Price

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

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

Rated 3.4 out of 5 stars
26
$19.90 Chewy Price
$45.99 List Price

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

Cobalt Aquatics Neo-Glass Submersible Aquarium Heater, 100-watt

Rated 3.4 out of 5 stars
16
$28.68 Chewy Price
$44.73 List Price

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

Fluval Electronic Aquarium Heater, 300-watt

Rated 4 out of 5 stars
96
$58.23 Chewy 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
86
$2.99 Chewy Price
$4.99 List Price

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

Aqueon Pro Aquarium Heater, 150 watt

Rated 3.8 out of 5 stars
116
$59.99 Chewy Price
$78.95 List Price

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

Marineland Precision Heater, 300 Watt

Rated 3.2 out of 5 stars
111
$41.47 Chewy Price
$51.79 List Price

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

Fluval Wireless 2-in-1 Digital Fish Thermometer

Rated 4.1 out of 5 stars
24
$21.99 Chewy Price
$25.99 List 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
57
$30.99 Chewy Price
$34.99 List Price

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

Marina 6-in Submersible Fish Heater, 50-Watts

Rated 3.7 out of 5 stars
6
$16.21 Chewy Price
$32.99 List 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 3.9 out of 5 stars
35
$27.97 Chewy Price
$34.99 List 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
63
$3.74 Chewy Price
$3.99 List Price

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

Fluval E200 Electronic Fish Aquarium Heater, 200-watt

Rated 5 out of 5 stars
1
$48.37 Chewy Price
$64.99 List Price

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

OASE Indoor Aquatics HeatUp 25 Adjustable Fish Heater

Rated 4 out of 5 stars
7
$19.95 Chewy Price
$35.99 List Price

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

Seapora Digital Thermometer with Probe

Rated 3.9 out of 5 stars
9
$13.53 Chewy Price
$16.99 List Price

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

H2Pro Titanium Aquarium Heater, 200-watt

Rated 4.2 out of 5 stars
10
$52.60 Chewy Price
$64.99 List Price

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

Fluval P10 Pre-Set Aquarium Fish Heater

Rated 4.3 out of 5 stars
15
$18.74 Chewy Price
$26.99 List Price

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

Eheim Thermocontrol Aquarium Water Temperature Controller, 125-watt

Rated 3.7 out of 5 stars
13
$49.99 Chewy Price

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

Fluval M 200Watt Submersible Fish Heater

Rated 4.4 out of 5 stars
22
$36.99 Chewy Price

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

Lifegard Pre-Set Quartz Glass Heater Electronic Control, 25 watt

Rated 4 out of 5 stars
9
$13.59 Chewy Price
$20.51 List Price

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

GloFish Submersible Fish Heater, 50-watts

Rated 4.2 out of 5 stars
19
$17.47 Chewy Price
$22.49 List Price

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

Marina Betta Submersible Aquarium Heater

Rated 3.9 out of 5 stars
70
$12.98 Chewy Price
$17.99 List Price

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

Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt

Rated 4 out of 5 stars
56
$47.99 Chewy Price
$87.67 List Price

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

OASE Indoor Aquatics HeatUp 100 Adjustable Fish Heater

Rated 4 out of 5 stars
4
$38.72 Chewy Price
$42.99 List Price

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

Fluval M 300Watt Submersible Fish Heater

Rated 4.2 out of 5 stars
30
$38.99 Chewy Price
$39.99 List 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
5
$21.99 Chewy Price

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

Aqueon Mini Aquarium Heater, 2-gal, 5 watt

Rated 3.7 out of 5 stars
87
$16.99 Chewy 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
$59.99 Chewy Price
$64.99 List Price

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

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Aquarium & Fish Tank Heaters

Aquarium & Fish Tank Thermometers

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