10 Best Aquarium Heaters 2025: According to Reviews | Chewy

The 10 Best Aquarium Heaters

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How we created this aquarium heater list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best aquarium heater.
We scanned thousands of customer reviews and ratings and scored each product based on its performance against each of the key considerations. We then considered how popular a product is with Chewy customers and combined that with its key consideration scores to create the list of the best aquarium heaters.

Key aquarium heater considerations

Durability and Safety Features

Ease of Use and Installation

Heating Capacity

Temperature Accuracy

1
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt
LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt

LvLrister Titanium Thermostat with Intelligent LED Display Submersible Aquarium Heater, 12.8-in, 300-watt

Rated 4.7 out of 5 stars
75
$23.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.6/5
Excellent

Ease of Use and Installation

4.5/5
Great

Heating Capacity

4.6/5
Excellent

Temperature Accuracy

4.6/5
Excellent

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Saltwater

Capacity (Max)

≥120-250-L

Fish Type

Tropical Freshwater
2
Underwater Treasures Floating Glass Fish Thermometer

Underwater Treasures Floating Glass Fish Thermometer

Rated 4.4 out of 5 stars
178
$1.75Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.0/5
Great

Ease of Use and Installation

4.2/5
Great

Heating Capacity

4.3/5
Great

Temperature Accuracy

4.2/5
Great

Is this aquarium heater right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Marine Invertebrate, Betta, Bottom Feeder...
3
Eheim Jager Thermostat Aquarium Heater, 50-watt
Eheim Jager Thermostat Aquarium Heater, 50-watt

Eheim Jager Thermostat Aquarium Heater, 50-watt

Rated 4.2 out of 5 stars
154
$26.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.5/5
Great

Ease of Use and Installation

4.7/5
Excellent

Heating Capacity

4.3/5
Great

Temperature Accuracy

4.2/5
Great

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater
4
SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5-gal
SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5-gal
SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5-gal
SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5-gal
SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5-gal
SunGrow Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5-gal

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

Rated 4.2 out of 5 stars
142
$10.91Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

3.8/5
Good

Ease of Use and Installation

3.7/5
Good

Heating Capacity

4.2/5
Great

Temperature Accuracy

4.3/5
Great

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Nano Tank, Freshwater

Fish Type

Betta, Tropical Freshwater, Goldfish, Cichlid
5
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt
Penn-Plax Cascade Heat Preset Submersible Aquarium Heater, 10-in, 150-watt

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

Rated 4.3 out of 5 stars
69
$16.39Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

3.4/5

Ease of Use and Installation

3.8/5
Good

Heating Capacity

4.0/5
Great

Temperature Accuracy

3.9/5
Good

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater
6
Marina Floating Thermometer with Suction Cup for Aquariums

Marina Floating Thermometer with Suction Cup for Aquariums

Rated 4.1 out of 5 stars
241
$3.59Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.1/5
Great

Ease of Use and Installation

4.0/5
Great

Heating Capacity

4.0/5
Great

Temperature Accuracy

4.0/5
Great

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Marine Fish
7
Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt
Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt
Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt
Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt
Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt
Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt

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

Rated 4.1 out of 5 stars
54
$40.79Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.4/5
Great

Ease of Use and Installation

4.4/5
Great

Heating Capacity

4.2/5
Great

Temperature Accuracy

4.2/5
Great

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Freshwater, Saltwater

Fish Type

Marine Fish, Tropical Freshwater
8
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater
OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater

OASE Indoor Aquatics Biomaster Thermo 350 External Fish Heater

Rated 4.7 out of 5 stars
18
$319.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.7/5
Excellent

Ease of Use and Installation

4.8/5
Excellent

Heating Capacity

4.4/5
Great

Temperature Accuracy

4.6/5
Excellent

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater
9
SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank
SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank
SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank
SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank
SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank
SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank
SunGrow Betta Fish Thermometer Sticker, Temperature Strip for Small Aquarium & Reptiles Tank

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

Rated 4 out of 5 stars
72
$1.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.0/5
Great

Ease of Use and Installation

3.9/5
Good

Heating Capacity

4.2/5
Great

Temperature Accuracy

4.3/5
Great

Is this aquarium heater right for my pet?

Material

Plastic

Aquarium Type

Nano Tank, Freshwater, Saltwater

Fish Type

Betta, Goldfish, Cichlid, Tropical Freshwater...
10
Fluval M 300Watt Submersible Fish Heater
Fluval M 300Watt Submersible Fish Heater

Fluval M 300Watt Submersible Fish Heater

Rated 4.3 out of 5 stars
28
$38.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability and Safety Features

4.1/5
Great

Ease of Use and Installation

4.8/5
Excellent

Heating Capacity

4.1/5
Great

Temperature Accuracy

4.6/5
Excellent

Is this aquarium heater right for my pet?

Material

Glass

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater