4 Best Heaters & Thermometers for Goldfish 2025: According to Reviews | Chewy

The 4 Best Heaters & Thermometers for Goldfish

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How we created this heaters & thermometer list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best heaters & thermometers for goldfish.
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 heaters & thermometers for goldfishes.

Key heaters & thermometer considerations

Durability

Heating Capacity

Safety Features

Temperature Control

1
Underwater Treasures Floating Glass Fish Thermometer

Underwater Treasures Floating Glass Fish Thermometer

Rated 4.4 out of 5 stars
184
$1.75Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability

4.2/5
Great

Heating Capacity

4.2/5
Great

Safety Features

4.2/5
Great

Temperature Control

4.1/5
Great

Is this heaters & thermometer right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Marine Invertebrate, Betta, Bottom Feeder...
2
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
150
$6.91Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability

3.9/5
Good

Heating Capacity

4.3/5
Great

Safety Features

4.0/5
Great

Temperature Control

4.2/5
Great

Is this heaters & thermometer right for my pet?

Material

Plastic

Aquarium Type

Nano Tank, Freshwater

Fish Type

Betta, Tropical Freshwater, Goldfish, Cichlid
3
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
73
$1.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability

4.0/5
Great

Heating Capacity

4.2/5
Great

Safety Features

4.3/5
Great

Temperature Control

4.2/5
Great

Is this heaters & thermometer right for my pet?

Material

Plastic

Aquarium Type

Nano Tank, Freshwater, Saltwater

Fish Type

Betta, Goldfish, Cichlid, Tropical Freshwater...
4
GloFish Submersible Fish Heater, 50-watts
GloFish Submersible Fish Heater, 50-watts
GloFish Submersible Fish Heater, 50-watts
GloFish Submersible Fish Heater, 50-watts
GloFish Submersible Fish Heater, 50-watts
GloFish Submersible Fish Heater, 50-watts
GloFish Submersible Fish Heater, 50-watts

GloFish Submersible Fish Heater, 50-watts

Rated 4.2 out of 5 stars
19
$17.47Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Durability

4.1/5
Great

Heating Capacity

4.5/5
Great

Safety Features

4.0/5
Great

Temperature Control

4.4/5
Great

Is this heaters & thermometer right for my pet?

Aquarium Type

Freshwater

Fish Type

Marine Invertebrate, Tropical Freshwater, Betta, Goldfish...