How to Install Submersible Aquarium Heater: A Step-by-Step Guide

If you’re a dedicated aquarium owner, you know how important it is to maintain a comfortable environment for your fish. A properly working aquarium heater is essential to keep the water temperature steady. A submersible aquarium heater is particularly useful in maintaining stable water temperatures in your aquarium thanks to its efficient and reliable performance.

But how do you go about installing a submersible aquarium heater? It’s important to know the proper steps to avoid any mishaps and ensure your fish stay happy and healthy. In this blog post, we’ll walk you through the process of installing a submersible aquarium heater so you can keep your aquarium running smoothly.

Select the Right Heater

Installing a submersible aquarium heater is a crucial step for maintaining a healthy aquatic environment for your fish. Firstly, it’s essential to select the right heater based on the size of your tank and the wattage needed to keep the water at a consistent temperature. Once you’ve chosen the right heater, it’s time to install it correctly.

Make sure to unplug all electrical devices near the tank before submerging the heater into the water. It’s best to install the heater near a water-flowing source like a filter to ensure even heating throughout the tank. Once it’s in place, give the water time to adjust to the new temperature before turning it.

Installing a submersible aquarium heater is a simple process that is well worth the effort for maintaining a healthy and happy aquatic environment for your fish.

Determine the Right Size for Your Tank

When it comes to selecting the right heater for your fish tank, it’s essential to consider the size and type of your tank. Aquarium heaters are designed to maintain a stable water temperature, keeping your fish and plants healthy and happy. To choose the right size heater, you need to know the size of your aquarium.

Generally, the rule of thumb is that you need 5 watts of heating power per gallon of water. So, if you have a 20-gallon tank, you would need a 100-watt heater. However, if your tank is in a drafty room or has a high evaporation rate, you may need a more significant heat output to keep the desired temperature.

Similarly, if your tank is in a cooler area or filled with cold-water fish, you may need a lower wattage heater. Properly sizing your aquarium heater ensures that it can maintain the right temperature, preventing temperature fluctuations that can harm your aquatic pets.

how to install submersible aquarium heater

Choose Between Glass or Titanium

When it comes to choosing between glass or titanium heaters, there are several factors to consider. Glass heaters are generally less expensive and can be effective for small tanks or aquariums. However, they are also more fragile and prone to cracking or breaking.

Titanium heaters, on the other hand, are more durable and resistant to damage. They are also better suited for larger tanks or aquariums that require more heat output. Additionally, titanium heaters are safe for use in both saltwater and freshwater environments, whereas glass heaters are typically not recommended for use in saltwater tanks due to the corrosive nature of saltwater.

Ultimately, the choice between glass and titanium heaters will depend on your specific needs and budget. If you have a small tank or are on a tight budget, glass heaters may be the way to go. But if you have a larger tank or want a more robust and durable heating solution, a titanium heater may be the better choice.

Prepare Your Tank for Installation

When it comes to setting up a submersible aquarium heater, the first step is preparing your tank for installation. Before you even take the heater out of the box, make sure your tank is clean and free of any debris that could interfere with its operation. You’ll also want to choose the appropriate location for your heater, whether that’s at the bottom of the tank or on the side.

Once you’ve determined the ideal spot, make sure the heater is securely mounted and arrange any cords and hoses in a safe and organized manner. When you’re ready to fill your tank, make sure the water level is above the minimum line on the heater and allow it to stabilize at room temperature before turning it on. With proper preparation and installation, your submersible aquarium heater can help keep your aquatic pets healthy and thriving.

Turn off Your Aquarium Equipment

When it comes to setting up a new aquarium, it’s important to properly prepare your tank for installation. One crucial step in this process is turning off your aquarium equipment. This includes any filters, heaters, air pumps, and powerheads.

This not only helps prevent damage to the equipment during installation but also ensures that the water doesn’t get too hot or cold, which could harm your fish and other aquatic inhabitants. Additionally, turning off the equipment gives you a chance to inspect it and make any necessary repairs or replacements before filling up your tank. So, take the time to turn off your aquarium equipment before you start setting up your new tank.

Your fish will thank you for it!

Remove the Plastic Guard and Suction Cups

When preparing your tank for installation, one essential step is to remove the plastic guard and suction cups. The plastic guard is usually placed over the bottom of the heater to protect it during shipping. It’s important to take it off before placing the heater in the tank to avoid any damage.

The suction cups are used to attach the heater to the side of the tank. Before attaching them, it’s best to clean the area where the suction cups will be placed with a paper towel or cloth. This will ensure that the suction cups attach firmly and securely to the tank, preventing any accidents.

By taking these simple steps, you can prepare your tank for installation and ensure that your heater works efficiently while keeping your fish happy and healthy.

Install Your Heater

If you’re wondering how to install a submersible aquarium heater, the process is relatively straightforward. First, make sure your aquarium is clean and free from debris. Then, select the appropriate wattage heater for your tank size.

Next, attach the suction cups to the heater and place it in the desired location. It’s important to ensure that the heater is fully submerged in the water to prevent any damage. Once the heater is in place, plug it in and allow a few hours for the temperature to stabilize.

Make sure to monitor the temperature regularly and make adjustments as needed. By following these simple steps, you can successfully install your submersible aquarium heater and provide a comfortable environment for your aquatic pets.

Connect Power Cord to the Heater

Installing your heater can be a daunting task, but it doesn’t have to be. One critical step in the process is connecting the power cord to the heater. It’s essential to ensure that you have the appropriate power supply for your unit and that the cord is in good condition before you begin.

Check the manufacturer’s specifications to see what voltage and amperage your heater requires. Then, locate an outlet that meets those criteria, preferably with a ground fault circuit interrupter (GFCI) to ensure safety. The power cord should be securely connected to the terminal block at the back of the heater, following the instructions in the manual.

Make sure the cord is not twisted or kinked, and avoid using extension cords to power your unit. Properly connecting your heater’s power cord is crucial for its safe and efficient operation, so take your time and follow the instructions carefully.

Attach Heater to Suction Cups

If you have a small aquarium and are looking for a way to keep the water temperature stable for your fish, then attaching a heater to suction cups is a simple solution to consider. To do this, first, you need to make sure that the suction cups are clean and dry before sticking them onto the side of your tank. Next, attach the heater securely to the suction cups.

This should provide a stable and safe position for the heater. It’s important to monitor your aquarium’s temperature regularly to ensure that it’s suitable for your fish. By keeping the temperature at a consistent level, you can provide a comfortable and healthy environment for your aquatic pets.

Remember to choose the right size heater for your aquarium and follow the manufacturer’s instructions carefully. With these simple steps, you can easily install your heater using suction cups and ensure that your aquarium’s water temperature stays at the perfect level for your fish to thrive.

Submerge the Heater in Your Aquarium

Installing a heater in your aquarium is a crucial part of providing a comfortable environment for your fish. When installing the heater, the first step is to submerge it in your aquarium. Most heaters have a level that indicates the water level required for proper functioning.

It is important to ensure that the water level in your aquarium is above this level. This helps to prevent the heater from being damaged due to overheating. Once the heater is submerged, ensure that it is firmly secured.

A good way to do this is to use suction cups to attach the heater to the side of your aquarium. This helps to keep the heater in place and prevents it from moving around and potentially harming your fish. Remember to also set the temperature according to your fish’s needs and the type of heater you are using.

With these steps, you can ensure that your heater is properly installed, keeping your aquarium at the right temperature for your fish to thrive.

Monitor Your Tank Temperature

If you’re new to aquatic pets, figuring out how to install a submersible aquarium heater can be a bit daunting. However, temperature control is crucial when it comes to keeping fish healthy, so it’s important to get it right. First, choose the right size heater for your tank.

It should be able to heat the volume of water in your tank and not overheat it either. Next, position the heater so that it’s completely submerged in water and won’t be visible from outside the tank. It’s also important to use a thermometer to monitor the water temperature and ensure that it’s consistent.

A fluctuation in temperature can cause stress on your fish and lead to health problems. Make sure to follow the instruction manual and always unplug the heater before removing it from the water. With these tips, installing a submersible aquarium heater can be a breeze, and you’ll have peace of mind knowing that your fish are swimming in a comfortable environment.

Check the Thermometer Regularly

Checking the temperature of your tank should be done regularly to ensure that your aquatic pets are living in a suitable environment. A sudden shift in temperature can drastically impact your fish, and it’s crucial to catch any fluctuations before it becomes a problem. Investing in a reliable thermometer that can accurately measure the water temperature is essential.

They come in various forms, including digital and analog, and some can be fully submerged, while others float on top of the water. By monitoring your tank temperature, you can ensure that your fish’s living conditions are stable and providing them with the best possible chance of survival. So next time you’re checking up on your fish, make sure to take a quick glance at the thermometer.

Your aquatic pets will thank you for it!

Adjust the Heater as Needed

When it comes to maintaining a healthy aquarium environment, monitoring the water temperature is crucial. Temperature can have a significant impact on your fish’s health and overall well-being. Adjusting the heater as needed is essential to maintain a consistent temperature within your tank.

Set the heater to the appropriate temperature and regularly check the thermometer to ensure the temperature is accurate. Changes in weather, aquarium size, or additional equipment, like a water pump, can cause fluctuations in temperature, so it’s essential to pay close attention and adjust the heater accordingly. Keeping a close eye on your aquarium’s temperature can help you prevent fish stress and disease.

With the right care and attention, your aquarium can be a beautiful and healthy home for your aquatic pets. So, don’t forget to monitor your tank temperature regularly and adjust the heater as necessary.


Now that you know how to install a submersible aquarium heater, you can finally provide your fish with a warm and cozy environment to swim in. With a little bit of know-how and a few simple steps, you’ll be able to keep your aquatic pals happy and healthy all year round. And who knows? Maybe you’ll even become the next aquarium heating expert.

So dive right in and get started on creating the perfect underwater oasis for your finned friends. Your fish will thank you for it!”


What is a submersible aquarium heater?
A submersible aquarium heater is a device that is used to regulate the temperature of water in an aquarium.

Why is a submersible aquarium heater important?
A submersible aquarium heater is important as it helps to maintain a stable temperature in the water, which is crucial for the well-being of fish, plants, and other aquatic life.

What size submersible aquarium heater do I need?
The size of the submersible aquarium heater you need depends on the size of your aquarium. A general rule of thumb is 5 watts per gallon of water.

How do I install a submersible aquarium heater?
To install a submersible aquarium heater, first, turn off all power sources and unplug the filter. Then, attach the heater to the side of the aquarium using suction cups. Finally, plug in the heater and turn on the power.

Should I leave my submersible aquarium heater on all the time?
Yes, it is recommended to leave your submersible aquarium heater on all the time to maintain a stable water temperature.

How often should I check the temperature with a submersible aquarium heater?
It is recommended to check the temperature of your aquarium water with a submersible aquarium heater at least once a day.

Can a submersible aquarium heater be used in saltwater tanks?
Yes, a submersible aquarium heater can be used in both freshwater and saltwater tanks, as long as it is rated for the appropriate tank size and water temperature.