Top 10 Best 25W Aquarium Heater Deals In 2022 [Quality Tested]

If you’re looking for an affordable way to heat an aquarium, a 25w aquarium heater is a great option. These heaters are typically easy to use and can provide a warm and cozy atmosphere in your aquarium.

25W Aquarium Heater Price Comparison Table

Last update on 2022-11-14 / Affiliate links / Images from Amazon Product Advertising API

10 Best 25W Aquarium Heaters Available For Purchase

Bestseller No. 1
DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker
  • 🐠25W Betta Aquarium Heater: Creating and maintaining a perfect and comfortable water temperature for our cute fish is not easy, which requires a lot of effort. Now DaToo MINI 25W Aquarium Heater can help you make this easier. Precise and constant temperature, no need to set, keep the temperature of fish habitat in the best state at all times. You will find it very easy and happy to take care of pet fish!
  • 🐠Precise And Constant Temperature: No need to set, DaToo Fish Tank Heater will automatically keep the water temperature of the fish habitat at 78℉. This temperature is very suitable for betta and most tropical fish. When the water temperature is lower than 78℉, the heater starts to heat and the red light is on. When the temperature reaches 78℉, the heater stops heating and the green light is on. DaToo will always maintain this comfortable temperature for your beloved fish!
  • 🐠The Smallest 25W Betta Heater: For most fish lovers who have small fish tanks of 1 to 5 gallons, a small heater means more space for fish. This is the smallest 25W aquarium heater on the market, only 0.2 inches. No matter how small your fish tank is, it can be used perfectly in it, and you can't even find it. Very MINI!!
  • 🐠Safe And Durable: Unlike traditional plastic seals, DaToo uses a rubber sealing layer, which ensures that DaToo has better sealing and safety performance, and will never leak electricity or water. Quartz glass material, explosion-proof and crack-proof, more sturdy and durable, without worrying about damage.
  • 🐠One Year Warranty & Satisfaction Guarantee: This heater is ideal for 1 to 6 gallon small glass or acrylic desktop aquariums. When in use, it needs to be submerged 100% in water. We provide one year warranty and 24 hours professional customer service. Buy With Confidence!
Bestseller No. 2
HITOP 25W 50W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cup (25W)
  • 🐟 HITOP 25W aquarium heater, length 7.2-inch, power cord 4.9ft, designed for small fish tanks, recommended for aquariums up to 10 gallon.
  • 🐟 Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes.
  • 🐟Adjustable and easy to use: This aquarium heater, adjustable temperature range 68 ~ 93 °F, after setting the temp you want, will on or shut off automatically when the water temperature changes, no extra adjustment is required.
  • 🐟Accurate Temperature Control: This fish tank heater built-in thermostat, will automatically keep the water at the set temperature within±2°F error. Comes with an sticker thermometer to detect water temp at any time.
  • 🐟 Easier installation, you can install it with any angle by 2 powerful suction cups, just make sure it is under water fully. Besides, we provide 1 more extra suction cup for spare (total 3 PCS).We provide 12 months warranty.
Bestseller No. 3
YukiHalu Small Submersible Aquarium Heater, Mini Fish Tank Heater 25W 50W 100W 200W with Built-in Thermometer, External Temperature Controller, LED Display, Used for 5/10/20/40 Gallons (25 Watts)
  • 【Super Mini Size, 25Watt for 1-5 Gallons】 YukiHalu 25W aquarium heater is designed for 1-5 gallons mini fish tank. Compact design, take less space in the fish tank, easy to hide in the tank. Temperature can be accurately adjusted from 64 to 93°F. This heater suitable for both saltwater and freshwater. The rated voltage is 100-130V.
  • 【Automatic Constant Temperature with 1℉Accuracy】Thanks to advanced Intelligent Frequency Conversion Technology, the water temperature can be kept constant with an accuracy of 1℉. The heater's working frequency will be changed according to temperature variation, and the heating is automatically stopped when the set temperature is reached. Compare to traditional heater, this new technology will cut down 49% electricity bill for you.
  • 【Overheating Protection, Out of Water Protection】The power will be cut off and stop heating automatically if the heater out of water or overheating. Protect your fish. Never cook your fish. 30days full refund, 12-months warranty.
  • 【External Temperature Controller, Never Wet Your Hands】Use an external controller to set the temperature instead of immersing your hands in water to rotate the dial. Never wet your hands or contaminating your tank. Strong suction cups, easy to install.
  • 【Built-in Thermometer, Power-off Memory Function】Dual built-in temperature sensor, the water temperature will be displayed on the external temperature controller in real time. No need to buy other aquarium thermometer. The heater will remember the temperature setting, no need to reset the temperature after power off.
SaleBestseller No. 4
Fish Tank Aquarium Heater - Adjustable Temperature Submersible Thermostat Heater,25W/50W/100W/150W/200W/300W
  • [PREMIUM SHATTERPROOF GLASS]Made of shatterproof glass and BPA-free plastic.Bnzaq aquarium heaters are fully submersible and safe for fish without any toxic substance producing.3 FREE artificial aquarium plants as ornament in your tank.
  • [NO LONGER CHILL YOUR FISH]Automatically regulate and maintain water temperature,imitate the original ecological environment for your tropical fish.Provided fish with warm water environment.Perfect to apply to fresh and salt water.
  • [ADJUSTABLE TEMPERATURE]Temperature range: 68°F~93°F.25W heater:suitable for fish tank within 7 gallons,Length:7.8".Easy to adjust temperature by the aquarium heater that suit more species of fish.
  • [AUTOMATIC CONSTANT TEMPERATURE]When water temperature reaches set value,the indicator light will be OFF and the heater will automatically stop heating.The heater will automatically start heating and indicator light will be ON if water temperature is low.You could place heater horizontally or vertically.
  • [ATTENTION]Please place the heater near place (filter or pump) of water flowing to keep more even water temperature.Unplug the heater 30 minutes early when changing the water for the fish tank.
SaleBestseller No. 5
PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks (Preset Temperature 78℉)
  • ★【Betta Heater】This Fish Tank Heater should be 100% submerged into water, Ideal for small glass or acrylic desktop aquariums up 1 to 6 Gallons, not suitable for less than 1 gallon tank.
  • ★【Quick and Easy Installation】:Vertical or horizontal placement using, Aquarium heater automatic temperature control 78℉, no need to adjust temperature, easy to operate, fishes happy.
  • ★【How it Works】: Plug in, red light turns on, the heater will start working until water temperature up to 78°F, and red light off, then the green light will turn on, heater stop working and keeping constant temperature 78°F. Accuracy:±3°F
  • ★【Note】: Do not operate or leave product plugged in when your water tank is out of water, heater should be fully submerged into water. Please install a water pump or filter to help water circulating while heating.
  • ★【SATISFACTION GUARANTEED】Our Aquarium Heater is built with durability in mind and safety for every design. In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.
SaleBestseller No. 6
Fluval P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts
  • Strong shatterproof polymer construction protect tank and inhabitants from damage
  • Preset temperate requires no adjustment
  • Waterproof, fully submersible design allows easy positioning inside aquarium
  • LED running lamp illuminates to indicate when product is in use
  • For use in freshwater and saltwater aquariums
Bestseller No. 7
HITOP Mini Submersible Aquarium Heater - 25W 50W 100W 200W 300W Small Heater for Fish Tank 1-70 Gallon with Controller (25W)
  • 🐟HITOP Mini size aquarium heater 25W with controller, suitable for seawater and freshwater heating, betta fish and turtle tanks and other small fish tanks or fish bowl 1-6 gallon.
  • 🐟Easy to operate: This fish tank heater is easy to use, 6Ft long cable wire and the external controller can easily set the temperature, and the temperature adjustment range is 68-93℉.
  • 🐟Easy to read temperature: The controller of this heater has Digital LED temperature display, which can display the real-time water temp and set temp, so that you can know the temperature changes in the fish tank easily. There is also a clear heating indicator on it.
  • 🐟Fish-friendly: This aquarium heater is made of thickened quartz glass, and has good sealing performance to prevent water from entering, making it a more fish-friendly heater.
  • 🐟Package: Comes with two suction cups, a bottom cover, and a sticker-thermometer. Please check the product carefully before using it, we provide a 12-month warranty for this product.

Last update on 2022-11-14 / Affiliate links / Images from Amazon Product Advertising API

25W Aquarium Heater New Releases

Aquarium Heater Aquarium Heater Automatic Explosion-proof Adjustable Fish Tank Thermostat Heating Rod For Fresh Aquariums For Both Fresh And Marine Water Submersible Fish Tank Heater Thermostat ( Size
  • There is no doubt that this fish tank heating rod can be more stable and reliable to operate owing to its good heat resistance, good insulation and high heat transfer efficiency features.
  • The temperature of the fish tank heater can be adjusted by the temperature knob, which can provide a constant warm environment for your fish to stay healthy.
  • The fish tank heating rod is made of premium glass.
  • There are 5 sizes of the product for choice. And the cable length is 0.9cm.
  • It is suitable for both fresh or saltwater aquariums.
ENPAP Aquarium Heater Aquarium Submersible Fish Tank Adjustable Temperature Thermostat Heater Rod for Both Fresh and Marine Water Submersible Fish Tank Heater Thermostat (Size : 25W)
  • The temperature can be adjusted from 20 degrees to 34 degrees.Convenient installation, simple operation, high temperature resistance, explosion-proof quartz glass tube, high safety!
  • Sensitive temperature regulator and over-temperature protection device are installed in the rod, and high-resistance heating wire is used, which generates uniform and stable heating and long service life.
  • Good heat resistance, good insulation, high heat conduction efficiency, equipped with strong support hooks and parking suction cups, making it more stable and reliable.
  • Double-layer waterproof protection, full submersible design, can accurately maintain the set temperature.
  • The maximum immersion depth of 120CM can work. This product is only suitable for use in fresh water and sea water
25W Mini Aquarium Heater, Adjustable Submersible Betta Fish Tank Thermostat with External Controller & LED Temperature Display
  • 【Small Size Big Use】25W mini aquarium heater dimensions are only 12cm/4.7inch long,But can heat a 10L/2.6 gallon fish tank. And has a safe water level as low as 1.18 inches, making it ideal for betta and turtle tank aquarium.
  • 【Automatic Thermostat】The aquarium heaters adopts a PID control strategy, and can be accurately adjusted from 64 to 93°F. The small aquarium heater is automatically stopped when the set temperature is reached, Enter the thermal insulation state, providing a stable and comfortable environment for the fish.
  • 【Safety Protection】The mini heater needs to be fully immersed in water, leaving the water will automatically cut off the power. And if the aquarium heater overheats, it will automatically cut off the power and stop heating. Guaranteed electricity safety.
  • 【External Temperature Controller】The heater for fish tank is easy to set and read the temperature through the external controller with built-in thermometer, LED display and intelligent setting memory function. The mini aquarium heater remembers the temperature setting, so there is no need to reset the temperature after a power outage.
  • 【After-Sales Service】We provide you with a ONE-YEAR AFTER-SALES guarantee, if you have any questions about our products, please feel free to contact us, we will do our best to serve you.

Last update on 2022-11-14 / Affiliate links / Images from Amazon Product Advertising API

More information on the 25w aquarium heater

When it comes to aquarium heater, there are two types of them: 25w and 50w. 50w is the most common type, and it is the one that is used in most of the aquariums. 25w aquarium heater is a bit more powerful, but it is also more expensive.

One of the main benefits of using a 25w aquarium heater is that it is one of the most efficient types of aquarium heater on the market. It can heat up your aquarium in just a few hours, and it is one of the most reliable types of aquarium heater.

Another great thing about using a 25w aquarium heater is that it is very easy to set up. You just need to connect the power cord to the aquarium, and then you just need to set the temperature.

One of the biggest drawbacks of using a 25w aquarium heater is that it is not as powerful as some of the other types of aquarium heater. It is also not as reliable as some of the other types of aquarium heater.

Buying Guide For 25W Aquarium Heater

Looking for a 25w aquarium heater before making a purchase? Here are a few things to keep in mind:

1. Size: The size of the aquarium heater will affect the wattage it can produce. A small aquarium may need only 5watts, while a large one may need 25watts or more.

2. Type: There are three types of aquarium heater: AC, DC, and radio-frequency. AC aquarium heaters work best with AC power, while DC aquarium heaters work best with DC power. Radio-frequency aquarium heaters are becoming more popular, but they are not as commonly used as AC or DC heaters.

3. Wattage: The wattage of the aquarium heater will also affect the size of the aquarium it can heat. A small aquarium may need only 5watts, while a large one may need 25watts or more.

4. Type of Output: Some aquarium heaters come with a range of outputs, such as an AC or DC outlet, a fan, or a night light. Others only have one output, such as a light.

5. Reviews: Reviews of the different aquarium heater types and wattages are a good indicator of how well the heater is performing.

6. Warranty: Some aquarium heaters come with a warranty, while others do not. A warranty can help protect the purchaser from any potential problems with the heater.

7. Installation: Installing the aquarium heater is a straightforward process, but there are a few steps that should be followed carefully.

8. Care: Following the proper care for an aquarium heater can ensure that it lasts for years.

If you are looking for an aquarium heater, make sure to read the reviews, research the type of output it has, and get a warranty.


There are many 25w aquarium heater options on the market today. It is important to select the right one for your aquarium based on your specific needs. Some factors to consider include the size of your aquarium, the wattage you need, and the type of heater.

Use the Add to cart button to buy your 25w aquarium heater. You’ll be able to see if there is a shipping charge or not. You might get a free shipping on the 25w aquarium heater. It depends on the product specification. If you don’t like the product, you can return the Items shipped from, including Amazon Warehouse, can be returned within 30 days of delivery. You can avail refunds on most products except a few. Also, don’t forget to check the warranty information before purchasing.