Top 10 Useful Aquarium Heater Tips For Beginners

Top 10 Useful Aquarium Heater Tips For Beginners

New to aquarium heaters? Follow our top 10 useful aquarium heater tips for beginners to ensure your fish stay warm and healthy in their aquatic home.

If you’re new to the fishkeeping hobby or are thinking about starting a freshwater aquarium, a good aquarium heater is one of the most essential pieces of equipment you’ll need.

10 Useful Aquarium Heater Tips For Beginners

Useful Aquarium Heater Tips
Useful Aquarium Heater Tips

Here at Pet Navy, in this article, we’ll give you our top 10 tips for choosing and using an aquarium heater to help you keep your fish healthy and happy.

  1. Choose an aquarium heater that’s the proper size for your tank. Too small, and your heater won’t be able to maintain a stable temperature; too large, and you risk overheating your water and harming your fish.
  2. Don’t skimp on quality – a good aquarium heater is an investment that will pay off in the long run.
  3. Read the manufacturer’s instructions carefully before using your heater to ensure proper and safe operation.
  4. When setting up your aquarium, place the heater where plants or other decorations will not obstruct it.
  5. Make sure the aquarium heater is completely submerged in water before turning it on.
  6. Set the heater to the desired temperature and allow it to run for 24 hours before adding any fish to your tank.
  7. Once your fish are in the tank, closely monitor the water temperature to ensure it remains stable.
  8. If the water temperature drops, adjust the heater accordingly.
  9. Never turn the aquarium heater off and on frequently, as this can shorten its lifespan.
  10. Regularly inspect your aquarium heater for damage or wear, and replace it as necessary.

By following these tips, you can be sure that your fish will have a comfortable and stable environment to thrive.


Aquarium heaters play a pivotal role in maintaining a stable and comfortable environment for your aquatic pets. If you’re new to the world of fish-keeping or just looking to learn more about heaters, this FAQ is for you!

Fish Tank Heater
Fish Tank Heater

1. What should I look for in an aquarium heater?

When selecting an aquarium heater, consider its wattage, adjustability, safety features, and type (submersible or external). Ensure it’s suitable for the size of your tank and provides consistent heating.

2. Should an aquarium heater stay on all the time?

Not necessarily. An aquarium heater should maintain a consistent temperature. If the water reaches the desired temperature, a good heater will automatically turn off and turn back on when needed. It’s essential to have a thermostat to regulate this.

3. How far in should a fish tank heater be?

Submersible heaters should be fully submerged in water to function correctly. Ensure the heating element, especially, is underwater to prevent malfunction or damage.

4. What wattage heater for a 75-gallon tank?

For a 75-gallon tank, a heater between 200 to 300 watts is typically recommended. However, this can vary based on the room’s ambient temperature and the specific needs of your fish.

5. How do I know if my fish tank is warm enough?

Using an aquarium thermometer is the best way to monitor the tank’s temperature. Place it opposite the heater for an accurate reading. Ensure the temperature aligns with the needs of your specific fish species.

6. Is a 50-watt heater good for a 20-gallon tank?

Yes, a 50-watt heater is generally suitable for a 20-gallon tank. However, if the room where the tank is located is particularly cold, you might need a higher wattage.

7. Why is my fish staying near the heater?

If your fish is constantly near the heater, it might be too cold in the tank, indicating that the heater isn’t powerful enough or isn’t working correctly. However, it could also be due to other factors like stress or illness.

8. Should the aquarium heater turn up for winter?

If the room temperature drops significantly during winter, you might need to adjust the heater to maintain a consistent water temperature. Monitor the water temperature regularly and adjust as needed.

9. How long does it take a heater to warm up a fish tank?

The time it takes depends on the heater’s wattage and the tank’s size. Typically, you can expect a temperature rise of 0.5 to 1.5°F per hour. So, for a significant temperature change, it might take several hours.

10. Where is the best place to put a heater in an aquarium?

Place your heater near a water flow source, like a filter outlet, to distribute the heated water evenly. Avoid corners where water circulation is low. Ensure it’s positioned vertically or at a 45-degree angle for optimal performance.

11. Do aquarium heaters need to be at an angle?

While some heaters work best when fully vertical, others can be placed at a 45-degree angle. Check the manufacturer’s instructions. An angled placement can ensure better water circulation around the heater.

12. What are the 2 types of aquarium heaters?

The two primary types are submersible and external (or inline) heaters. Submersible heaters are placed directly in the tank, while external heaters are installed outside, usually connected to the aquarium’s filtration system.

Overall, choosing and maintaining the right aquarium heater is crucial for your fish’s health and well-being. Always refer to the manufacturer’s guidelines and consider the specific needs of your aquatic pets. Happy fish-keeping!

You may also like these:

Similar Posts

Leave a Reply