How To Keep Your Aquarium Warm Without A Heater (2023) (2023)

Many of us enjoy keeping fish and should know how to keep an aquarium warm without a heater. Tropical fish and bettas are some of my favorites. Once you have taken up this hobby you need to be very careful with all the advanced techniques and accessories for your fish and aquarium. The most important thing about your aquarium is how you keep it warm. In this case, many types of heaters are available in the market to meet this need, but nowadays the power outage has become a big problem to keep them warm without heating. Backup power has become a vital necessity that must be provided as soon as possible to maintain temperature. It is our responsibility to know how to keep fish alive when the power goes out.


Reasons to keep an aquarium warm without a heater

Who wants to spend time learning how to keep aquariums warm? Several reasons motivate aquarists to solve this problem:

  • power outages_they can occur over a short period of time or over a long period of time;
  • cold winter temperature– If your tank isn't heated or your heater can't handle the drastic changes in temperature, you may need an extra layer of heat.
  • Heating problems/replacement– If a tropical aquarium does not have a heater because the old one has been damaged or replaced, the fish can suffer;
  • tropical aquarium -if unpredictable periods of heat do not cause a drop in temperature; if the water temperature fluctuations do not freeze;
  • the wireless system- By simply configuring a nano tank to your personal preference, you can choose a wireless system for your nano tank.

The best ways to quickly heat aquarium water

I will explain some useful elements to gradually heat the water in the tank to finish the heating.

It may take some creative thinking to use some of these add-ons, but you have to try if you're considering a heaterless setup.

Here are someTricks and workaroundsto an aquarium heater that explains how to heat aquarium water quickly without a heater

1.In emergency situation.Use a blanket or heavy towel.

This can prove to be the quickest and most readily available solution in any household. All fish keepers should have a blanket and heavy towels at home. Its main purpose is to keep the fish away from the cold air entering the tank. A heavy cover is sufficient for large tanks. This creates insulation around the tank. Compared to a thin towel, a thick towel works more effectively. Using a towel or blanket will keep the water temperature in an aquarium as long as it is large enough to prevent freezing.

2.Best for small aquariums - use a heating mat

Generally,heating matsare well suited for small tanks such as aquariums. But at the same time they can increase the water temperature in the small aquarium.

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A protective layer must be added when using heating mats. This method protects your colon from hot spots and glass cracks.

Thinking of glass as the best conductor of heat isn't enough, so this isn't the best complement.

Compared to the other heating methods, this is more of an experiment.

3.Choose a cap/cover/cover to cover the teeThanks

To keep an aquarium warm without a heater, cover it with a lid or hood or canopy. This is the most common and easiest way to create limited contact between the water and the cold air entering the tank.

The aquarium cover protects it from the elements and helps it warm up quickly. The tops of most tanks can be easily removed to allow access to the interior of the aquarium and to manage all interior spaces.

Covering the tank with a lid may reduce oxygen delivery, which will not happengood for fish life, but at the same time the oxygen content can be maintained with an air pump and an air stone.

4.Use warm water for water changes.

Maintaining the water temperature in an unheated tank is not a difficult task that requires frequent stops to heat it up as quickly as possible.

This method requires full attention and supervision. It's not a long-term solution, but it will help keep you warm for a while.

First of all, you need a container that can easily hold boiling water or is unbreakable.

Half fill the container with boiled water. Be careful not to tip the water tank over when you place it on the aquarium. Don't let it touch the sides of the tank or your little friend could get crushed.

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Mix a portion of boiling water with room temperature water, but do not pour boiling water directly into the tank (even if there are no fish yet).

You will need to save extra water for water changes if you decide to use this method of heating your tank.

Of course, the temperature must be increased slowly. Some fish species can be harmed if lifted faster than 1° per hour.

5.Place the aquarium in a heated room near a heater / in sunlight

In cold climates, this type of situation causes anxiety to aquarists. Without a heater, an aquarium owner has a lot of work to do to keep their aquarium warm.

One of the most popular solutions is a heated room, which is available in almost every room in the house. A continuous heater is placed on coolers to heat the room. OPlacement of an aquariumin a heated room stabilizes the water temperature. No heat means the temperature fluctuates and can cause serious stress in bettas. This affects your immune system, leading to weakness and illness. Fluctuations should be between 1-2 Fahrenheit.

To heat an aquarium you can place it on the sunny side, but watch out for direct sunlight as this can lead to algae growth on the fish. A 6 hour day is enough to get natural sunlight. It's a great way to warm up your aquarium and takes very little time.

6. Inefficient and inferior filters

We all know that heat is generated by electrical systems and an inefficient systemmechanical system generates more heat than would be appropriate for your aquarium in the absence of a heater or heating system. An inferior filter will also work in this condition. When water flows into the filter, it is constantly heated.

Unlike bright light, sun or heated rooms, using the filter is a constant and better way to heat your aquarium.

With this method, you should test different filters that can provide the necessary heating system for the tank.

It would help if you also took great care to create consistent temperatures across the filter. Filters that are not energy efficient can fail throughout the day. Temperature changes may result from the use of these types of filters. In this case, you should keep a box and receipt so that you can exchange or return the filter.

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Insulate your tank, glass walls

If you want to insulate the glass walls of your aquarium, you can choose between the following options:

Besides the insulation method, other methods may not be sufficient to keep your aquarium warm without a heater. How long do you plan to heat your aquarium by insulating it, you should know both temporary and permanent methods.

1. Rolling up a blanket is a temporary method for only a few hours. Cover the aquarium with a blanket without immersing it in water. It's a good option for temporary insulation on the sides and top of the aquarium.

2. Another option is to set up a styrofoam container to cover the glass walls around the entire aquarium. Styrofoam is a lightweight, easy-to-roll aquarium material. Put a heat pack inside first. Heat packs for shipping jobs, but you can also use reusable ones since you can charge them while you're there.

Insulating the sides and bottom of the aquarium is the best permanent solution.

Is it possible to heat an aquarium without a heater using aquarium lighting?

The answer is definitely NO, as aquarium lights can generate heat, but in extremely small amounts. If you decide to rely only on gentle heat, it becomes very dangerous for the fish.

The result is that it's not a good idea to turn on the lights without a heater. If it is necessary to use lights, turn on bright lights but not the heater replacement.

Can you heat an aquarium without electricity?

Most of us would like to know how to heat a tank without electricity for heating aquariums. As we all know, heaters are mainly used to heat aquariums with electricity and it is not possible to run them without electricity.

The aquarium can be heated without electricity using heating pads and hot-water bottles. Candles can also be used to heat the tank, but this method is only suitable for tetras. You have to be very careful when doing this. Burning candles have a calming effect on the water. This is a temporary procedure that should not be done long-term.

How To Keep Your Aquarium Warm Without A Heater (2023) (1)
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Why do tetras need an aquarium heater?

To keep the fish healthy and safe, choose an aquarium heater that provides adequate heat and maintains the required temperature.

In order for tetras to live at constant temperatures for a long time, it is necessary to use a heater. Undoubtedly, tetra is affected by changes in water temperature, although its sensitivity to environmental parameters is quite low. This can have a negative impact on the health of the fish. Because of this, you need to keep the tank water temperature right. A high-quality aquarium heater prevents damage to the fish. Don't be reckless with fish health issues.

Does Betta need a heater?

Yes, Betta fish require a heater to maintain a stable and appropriate water temperature in their tank. Bettas are tropical fish that thrive in warm waters with a temperature range of 24-28°C (76-82°F).

What are aquarium heaters and how do they work?

An aquarium heater uses electricity to keep the water warm and maintain the temperature of the fish in the tank. The heating does not work without electricity. No aquarium heater will do the job.

Different types of heaters have different functions, so you need to know which ones you need.

Modern aquarium heaters are designed to turn off automatically when the temperature reaches the desired level. On the other hand, when the temperature drops, it turns on again automatically.

How important is the size of the aquarium heater?

Today, aquarium heaters are more advanced and come in many sizes. The correct heater size depends on the size of your aquarium. If you know the size of your aquarium, you will find the right one. It equates to the correct wattage per gallon.


However, there are many ways to keep your Beta tank warm without heating it up, but as mentioned above, this isn't a permanent solution. To maintain fish health and ensure long life, there is no other way than to buy the best quality heater for your aquarium.

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How can I heat my fish tank faster? ›

Using a hot water bottle is another practice that can be used to heat the water inside a fish tank quickly. If you fill up a hot water bottle with warm or hot water, securely close the lid, and place it inside a fish tank, the heat permeating from the water bottle will regulate the fish tank's water.

How do I keep my aquarium at constant temperature? ›

If your aquarium is near a window, close the curtains to prevent direct sunlight from heating the water. Install a chiller on your aquarium in a well-ventilated space. This will help keep your aquarium at a constant temperature, no matter how hot the weather gets!

Can you put hot water in a fish tank to warm it up? ›

We might ask, “Can I add warm water to a fish tank?” when there is no aquarium heater available. Yes, you can add warm water to a fish tank but not in a direct way, you should turn it into a water container.

Can fish live without a heater? ›

Yes, you can have a fish tank without a heater! Provided that you use cold water fish species that thrive in the 50–70 °F temperature range, your natural room temperature will be fine.

How do I know if my fish tank is too cold? ›

If your tank temperature is too cold, then your fish's metabolism will slow down, which leads to your fish becoming sluggish and sleepy. On the flipside, water that is too warm causes your fish's metabolism to speed up. Your fish will become more lively or even hyperactive.

Can you put a heater in a 1 gallon fish tank? ›

The FREESEA Aquarium Submersible Heater comes with a simple design that you can submerge in the water. As soon as you turn on the system, it will show you the real-time temperature. Designed for a water tank of 1 to 10 gallons, the system can maintain a temperature range of 59 degrees to 94 degrees Fahrenheit.

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

A good range is 76° to 80°F (25° to 27°C). A few species need to be kept several degrees warmer, and some species require temperatures a few degrees cooler. A thermometer is vital. A stick-on type enables you to check the temperature whenever you look at the aquarium.

How do I keep my aquarium at 60 degrees? ›

Reducing Water Temperature
  1. Keep the aquarium lights turned off.
  2. Make sure the room does not receive direct sunlight.
  3. Remove the hood from the tank (use caution if your fish are jumpers). Also, keep an eye on any cats you may have.
  4. Place a fan so that it blows directly across the water.
  5. Float ice packs in the water.
Nov 15, 2021

How much heat is lost through aquarium glass? ›

Radiation Heat Transfer
Black paint0.80
White paint0.87
2 more rows
Jul 15, 2009

Does room temperature affect fish tank? ›

If the ambient temperature of the aquarium's room is colder than normal, 3-5 watts per gallon may not be sufficient to maintain the temperature your fish need. In the summer, you may actually need to turn the heater down or off or even add a chiller.

How do I keep my fish tank running without electricity? ›

The best thing you can do is to buy a battery-powered air pump and use it to run an airstone to create some water movement in your tank. If you don't have a back-up pump then you can do this by hand. Simply take a cup and fill it with tank water then dump it back into the tank to produce water movement and air bubbles.

How do you make a homemade heater? ›

How to Make a Stoneware Heater
  1. Put 3-4 candles on a tray and light them up.
  2. Position two bricks on either side of the tray and two behind the tray.
  3. Take the ceramic bowl and put it upside down on the tray. ...
  4. Place the small fan on the bricks behind the tray.
  5. Turn on the fan, and your setup is complete!
Dec 28, 2022

What happens if tropical fish tank temperature is too cold? ›

What happens if your aquarium temperature is too low? For tropical fish, low temperatures can also cause a problem. At lower temperatures, these fish can become slow and sluggish, and many will soon die. It's similar to how you can survive outside without clothes or bedding.


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