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Aquarium & Fish Tank Heaters & Thermometers

Fish tank heaters are critical for maintaining a healthy and thriving fish tank for fish and plants that require warmer temperatures. Aquarium heaters have many benefits, but the primary one is regulating the underwater temperature so your fish and plants remain healthy. Heaters keep the water at a set temperature and minimize temperature fluctuations. There are several different types of aquarium and fish tank heaters, some of which include:

  • Submersible: Heaters that submerge into the water are the most common
  • Glass: Heaters made of glass are shatter-resistant and usually feature integrated thermometers
  • Titanium: Heaters made of titanium are known for durability and being used for larger tanks
  • External: Heaters placed outside the tank are ideal when dealing with limited interior space

Shop Chewy's impressive collection of aquarium and fish tank heaters today to ensure your underwater friends stay comfortable, happy, and healthy!

Frequently Asked Questions about Aquarium & Fish Tank Heaters & Thermometers

What are fish tank heaters?

Fish tank heaters are underwater devices that maintain a desired temperature for your pet fish and surrounding aquatic life. To do this, heaters usually possess a thermostat. The thermostat monitors the water temperature, turning the heater on and off to maintain its optimal setting.

Are tank heaters safe for fish?

Yes, tank heaters are usually safe for fish, primarily because fish require stable water temperatures to survive. Many fish are cold-blooded by nature, so they depend on outside sources of heat to help in maintaining their body temperature.

Do aquarium heaters use a lot of electricity?

Aquarium heaters can use a good bit of energy, but the amount depends on several factors. These factors include: heater wattage, size of tank, heater cycling, filters, pumps, and lighting. Purchasing energy-efficiency tank equipment can help offset the electricity costs in many cases.

Do you leave a fish tank heater on all the time?

It's important that fish tank heaters be left on all the time. A heater is monitored by its thermostat, so it automatically turns on and off to maintain a consistent water temperature. That consistent water temperature is vital to the health of fish and underwater plants.