10 Best Fish Aquarium Heaters
for December 2023

The Orlushy Submersible Aquarium Heater is a reliable option for a 100W aquarium heater, and the 2-cup design makes it easy to hide in the tank. The heater also shuts down automatically if it's set too high, so it's a great way to prevent dangerous overheating. The 2-cup design also makes it easy to add water to the heater, and the heater also shuts off automatically if it's set too high, so it's a great way to prevent dangerous overheating. The heater is also very accurate, with an accuracy of 0.1°C, so it's easy to set the temperature exactly the way you want. The heater is also very quiet, and the 2-cup design makes it easy to add water to the heater. The heater also shuts off automatically if it's set too high, so it's a great way to prevent dangerous overheating.

The Pulaco Betta Heater is ideal for tanks up to 1-6 gallons. It's easy to use, and it keeps the tank water at the right temperature. It's compact and light enough to leave on the tank all the time, and it's inexpensive. The only drawback is that, like most small heaters, it's noisy. You can position it under a glass hood so it can vent outside, but that will reduce the heater's effectiveness. Overall, though, we recommend the Pulaco Betta Heater for tanks up to 6 gallons.

The Freesea 25 Watt heater is our favorite pick for aquariums up to 5 gallons. It's inexpensive, and while it's a bit noisy, it's quiet enough not to bother fish or people in the room. It's also well built, with a sturdy plastic body that resists corrosion. The heater has accurate controls, with temperatures displayed clearly on the digital display. The heater's automatic safety shut-off feature prevents it from overheating, and the heater has a wide temperature range, so it could be used in aquariums of any size. The heater has suction cups on the bottom, which hold it securely in place in the aquarium, and it moves easily as well. The heater is submersible only, so it can't be used in aquariums where it's necessary to have a traditional heater sitting on a shelf above the aquarium water.

The HITOP 25W 50W aquarium heater is our top pick for budget buyers. It is bigger than most aquarium heaters, and the built-in thermostat helps it maintain the temperature you set, which is a definite plus. The heater is 33% thicker than most, which means its heat output is more stable and less likely to interfere with fish. The heater also has a built-in safety feature, which shuts off the heater if the water temperature gets too high. Its 50W output helps it heat larger aquariums. The heater has an adjustable temperature range of 68–93 F, which is more than most heaters, and it comes with the power chord you need to run it. The heater comes with a suction cup for mounting, but it's fairly large, so you'll have to mount it somewhere out of the way. Overall, the HITOP is a solid, reliable choice for small aquariums.

The JamgoZoo 200W Aquarium Heater has one of the best temperature controls we've seen on a heater. It heats quickly and precisely, and you can adjust the temperature in 1-degree increments. The heater's digital display is easy to understand, and the buttons on the heater's exterior are easy to press. The JamgoZoo 200W Aquarium Heater has two temperature units, one Celsius, and one Fahrenheit. The Celsius unit makes it easy to set a lower temperature, and the Fahrenheit unit makes it easy to set a higher temperature. The JamgoZoo 200W Aquarium Heater comes with a 6-foot power cord, a remote temperature sensor, and an instruction manual. The temperature sensor has a 5-foot cord, and the remote temperature sensor has a 10-foot cord. The JamgoZoo 200W Aquarium Heater's heating element is made of high-quality refractory ceramic, and it is produced in China. The heater's outer casing is made of high-quality plastic, and it can withstand splashes of liquid. The JamgoZoo 200W Aquarium Heater has a 1-year warranty.

The VIVOSUN 100W Aquarium Heater Submersible Titanium Fish Tank Heaters with Intelligent LED Temperature Display and External Temperature Controller is an affordable, well-performing heater that is suitable for most aquariums. It's well built and functions as designed. The titanium tube is sturdy and resistant to corrosion, and the heating element is located inside the titanium tube, so it's protected from water. The heater is sturdy and durable. The controls are intuitive and simple to use, and the built-in display helpfully shows the temperature, so you no longer need an external thermometer. The heater is easy to install. The heater is 110V, so it can only be used with 110V power supplies.

The SZELAM 500W Aquarium Heater Submersible Fish Tank Heaters with Intelligent Temperature Probe and LED Display External Temperature Controller,for Fish Tank 79-120 Gallons is, simply put, a workhorse of a heater. It's packed with features, and it's well built--an excellent choice for any aquarium. The heater is submersible, so it doesn't matter where you place it in your tank; it'll survive in even the deepest of waters. The heater's temperature probe is accurate, and its display is bright and easy to read. The heater has an external temperature controller, which makes it easy to adjust the set temperature from outside the tank. The heater has adjustable temperature settings, from 79 to 120 degrees Fahrenheit, and you can set the temperature in 1 degree increments. The heater has 2 independent power settings: 500W and 500W max. It's not unusual for aquarium heaters to have 2 power settings, but it's nice to have the extra option, especially for larger tanks. The SZELAM 500W Aquarium Heater Submersible Fish Tank Heaters with Intelligent Temperature Probe and LED Display External Temperature Controller,for Fish Tank 79-120 Gallons is backed by the manufacturer's 2-year warranty.

The Freesea Aquarium Fish Tank Heater is a compact, 50-watt aquarium heater that is ideal for small tanks up to 15 gallons. The heater automatically switches on and off when the temperature reaches or falls below the set value, and also has a safety shut-off feature to prevent overheating. The heater has a digital temperature display, and the controls are intuitive. The heater is nice and compact, and it fits nicely in the corner of the tank. The heater has high and low settings, and it stays cool to the touch when it's on. The heater uses tap water, so it doesn't use extra water, and the automatic shut-off feature ensures that the heater won't run unnecessarily. The heater runs quiet, and is easy to install. The heater only uses 1.5 watts of power when it's off, and the heater has a 1-year warranty.

The BOEESPAT small aquarium heater is reliable, easy to use, and compact, and it's among the least expensive options for maintaining your tank temperature. The heater has an intuitive digital control panel, and it's simple to set and maintain your desired temperature. The heater is small enough to fit inside most tanks, and it has an integrated temperature sensor that automatically adjusts the water temperature when the tank becomes partially or fully submerged. The heater's reliability was impressive, and it never failed to maintain the temperature we set. The heater's small size and ease of use also make it a great heater for small tanks, such as small freshwater and saltwater tanks, and as a turtle tank heater. The heater's LED temperature display blinks red, green, or blue, depending on the temperature, and it's easy to read. The heater's red light indicates that the heater is heating and that the temperature setting has been reached, and the blue light indicates that the heater is stopped and that the water temperature is below the setting. The heater's external temperature controller allows you to set the temperature from outside the tank, and the heater's temperature sensing accessories will automatically maintain the water temperature. The heater will restart heating when the water temperature is 1 degree below the temperature you set. The heater's compact size and ease of use make it a great heater for small tanks, such as small freshwater and saltwater tanks, and as a turtle tank heater. It's also inexpensive, and it's among the least expensive options for maintaining your tank temperature. The downside to the heater is that it runs continuously, and the light indicator on the heater's front isn't bright enough to illuminate a dark tank. If you don't want your tank to overheat, the heater's red light is a bad feature. The heater also doesn't come with a temperature probe, so you'll need to buy one separately.

We were impressed by the Submersible Aquarium Heater's build quality and relatively silent operation. It's easy to install (the instruction manual is very clear, and it's simple to install the heater), and it's fairly reliable. The temperature control is also reliable, and it displays both the current temperature and the target temperature simultaneously. The heater's performance also seemed consistent, and it kept our 40-gallon tank at a steady 72 degrees, which was warm enough for our fish. The Submersible Aquarium Heater's biggest downside is its power cable, which is a bit too short. When sitting more than a few inches away from the heater, the power cord was too short to reach my power switch, so I had to unplug the heater and plug it back in whenever I wanted to adjust the temperature. The heater also takes a long time to heat up. It typically took about 45 minutes for the heater to reach 75 degrees, which is more than half an hour longer than other heaters we tested.