Do fish tanks need heaters?

Some fish tanks need heaters, while others do not. Coldwater fish do not require a fish tank heater, but tropical fish do need aquarium heaters to maintain the right water temperature.

Where is the best place to put an aquarium heater?

The best place to put an aquarium heater is near a filter outlet or inlet or near a circulation pump. This will help ensure more even heat distribution. Install the heater according to the product instructions and try to position decorations away from the heater so the heated water can circulate more freely.

Can you leave aquarium heaters on at all times?

You can usually leave aquarium heaters on at all times, as most have an internal thermostat that turns off the heat when the water reaches a specific temperature. Be sure to read and follow all the instructions for your particular fish tank water heater, including whether to leave it on constantly and how to properly adjust the water temperature.

How do I choose the right aquarium heater for my fish tank?

Choose the right aquarium heater for your fish tank by picking one that has the right amount of heating power for your tank. A good rule of thumb is 5 watts of heat per gallon of tank capacity if you have a tank lid and keep the aquarium in a room that isn't too cold. Many experts recommend choosing a fully submersible heater for greater placement versatility and a compact design that is easier to hide. Read aquarium heater product descriptions and reviews on our site to find out which ones might be best for your particular needs.

Fish Tank & Aquarium Heaters - Page 3 (Free Shipping)

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OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White slide 2 of 8

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White slide 3 of 8

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White slide 4 of 8

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White slide 5 of 8

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White slide 6 of 8

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White slide 7 of 8

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White slide 8 of 8

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OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White

Rated 1 out of 5 stars

$89.99 Chewy Price

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OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater slide 2 of 6

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OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater

$40.23 Chewy Price

$42.99 List Price

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OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater slide 2 of 7

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OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater slide 4 of 7

OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater slide 5 of 7

OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater slide 6 of 7

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OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater

$84.99 Chewy Price

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OASE Indoor Aquatics Digital Fish Thermometer slide 2 of 4

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OASE Indoor Aquatics Digital Fish Thermometer

Rated 1 out of 5 stars

$19.99 Chewy Price

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Aquatop Floating Glass Thermometer with Suction Cup Mount

Rated 1 out of 5 stars

$6.99 Chewy Price

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Coralife Deep Six Aquarium Hydrometer

Rated 1 out of 5 stars

$12.49 Chewy Price

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OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, Dark Blue

Rated 1 out of 5 stars

$89.99 Chewy Price

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OASE Indoor Aquatics Biostyle Thermo 50 Fish Heater, White

$101.99 Chewy Price

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Aquatop Weighted Glass Thermometer with Claw

Rated 4 out of 5 stars

$83.99 Chewy Price

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Cobalt Aquatics Mini-Therm Submersible Aquarium Heater, 5-Watt

Rated 2.7 out of 5 stars

$12.38 Chewy Price

$18.20 List Price

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SunGrow Betta Fish & Reptiles Aquarium Tank Water Temperature Digital Thermometer Gauge

Rated 3.4 out of 5 stars

$6.99 Chewy Price

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Aquascape Submersible Fish Pond Thermometer

Rated 5 out of 5 stars

$9.32 Chewy Price

$12.98 List Price

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OASE Indoor Aquatics Biomaster Thermo 250 External Fish Heater

Rated 5 out of 5 stars

$276.99 Chewy Price

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OASE Indoor Aquatics Bioplus Thermo 100 Internal Fish Heater

$93.99 Chewy Price

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OASE Indoor Aquatics Bioplus Thermo 200 Internal Fish Heater

Rated 5 out of 5 stars

$103.99 Chewy Price

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OASE Indoor Aquatics Filtosmart Thermo 300 External Fish Heater

$238.99 Chewy Price

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Aquascape Smart Fish Pond Thermometer with Transformer

$99.99 Chewy Price

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Hydor Micro & Mini Aquarium Slim Heater, 15-watt

Rated 3.9 out of 5 stars

Free delivery on first-time orders over $35
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Fluval M 200Watt Submersible Fish Heater

Rated 4.2 out of 5 stars

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Fluval M 100Watt Submersible Fish Heater

Rated 4.5 out of 5 stars

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Lifegard Aquatics Adjustable Quartz Glass Heater Electronic Control, 300 watt

Rated 5 out of 5 stars

Free delivery on first-time orders over $35
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Hydor Micro & Mini Aquarium Slim Fish Heater, Black, 7.5-watt

Rated 5 out of 5 stars

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Hydor Betta & Betta Bowl Slim Heater, 7.5-watt

Rated 3.8 out of 5 stars

Free delivery on first-time orders over $35
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Out of Stock

Hydor Theo Shatterproof Aquarium Heater, 50-watt

Rated 3.5 out of 5 stars

Free delivery on first-time orders over $35
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Out of Stock

Aquatop Smart-Temp Thermometer with Magnet Mount

Rated 4.5 out of 5 stars

Free 1-3 day delivery on first-time orders
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Penn-Plax Aquarium LED Display Heater, 300W

Rated 2 out of 5 stars

Free delivery on first-time orders
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Lifegard Aquatics Pre-Set Quartz Glass Heater Electronic Control, 50 watt

Rated 4.2 out of 5 stars

Free delivery on first-time orders over $35
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Hydor Theo Aquarium Fish Heater, Black, 400-watt

Rated 2.5 out of 5 stars

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HDE LCD Digital Aquarium Thermometer

Rated 3.6 out of 5 stars

118

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Lifegard Aquatics E-Z Read Pond Thermometer

Rated 1 out of 5 stars

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Aquatop Digital Display & Suction Cup Mount Submersible Thermometer

Free 1-3 day delivery on first-time orders over $35
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Hydor Betta & Betta Bowl Slim Fish Heater, 7.5-watt, Black

Rated 1 out of 5 stars

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Fish Tank & Aquarium Heaters

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, White

OASE Indoor Aquatics HeatUp 150 Adjustable Fish Heater

OASE Indoor Aquatics Bioplus Thermo 50 Internal Fish Heater

OASE Indoor Aquatics Digital Fish Thermometer

Aquatop Floating Glass Thermometer with Suction Cup Mount

Coralife Deep Six Aquarium Hydrometer

OASE Indoor Aquatics Biostyle Thermo 30 Fish Heater, Dark Blue

OASE Indoor Aquatics Biostyle Thermo 50 Fish Heater, White

Aquatop Weighted Glass Thermometer with Claw

Cobalt Aquatics Mini-Therm Submersible Aquarium Heater, 5-Watt

SunGrow Betta Fish & Reptiles Aquarium Tank Water Temperature Digital Thermometer Gauge

Aquascape Submersible Fish Pond Thermometer

OASE Indoor Aquatics Biomaster Thermo 250 External Fish Heater

OASE Indoor Aquatics Bioplus Thermo 100 Internal Fish Heater

OASE Indoor Aquatics Bioplus Thermo 200 Internal Fish Heater

OASE Indoor Aquatics Filtosmart Thermo 300 External Fish Heater

Aquascape Smart Fish Pond Thermometer with Transformer

Hydor Micro & Mini Aquarium Slim Heater, 15-watt

Fluval M 200Watt Submersible Fish Heater

Fluval M 100Watt Submersible Fish Heater

Lifegard Aquatics Adjustable Quartz Glass Heater Electronic Control, 300 watt

Hydor Micro & Mini Aquarium Slim Fish Heater, Black, 7.5-watt

Hydor Betta & Betta Bowl Slim Heater, 7.5-watt

Hydor Theo Shatterproof Aquarium Heater, 50-watt

Aquatop Smart-Temp Thermometer with Magnet Mount

Penn-Plax Aquarium LED Display Heater, 300W

Lifegard Aquatics Pre-Set Quartz Glass Heater Electronic Control, 50 watt

Hydor Theo Aquarium Fish Heater, Black, 400-watt

HDE LCD Digital Aquarium Thermometer

Lifegard Aquatics E-Z Read Pond Thermometer

Aquatop Digital Display & Suction Cup Mount Submersible Thermometer

Hydor Betta & Betta Bowl Slim Fish Heater, 7.5-watt, Black

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