Search  for anything...
Mylivell

Mylivell Aquarium Heater Adjustable Submersible Fish Tank Heater Small Aquarium Heater Mini Fish Betta Turtle Tank Heater Thermostat 100W for 20-45 Gallon Suitable for Saltwater and Freshwater

    • Based on 3,864 reviews
Condition: New
Checking for product changes
$11.99 Why this price?
Save $19.50 was $31.49

Buy Now, Pay Later

As low as $2 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Apr 10
Order within 2 hours and 37 minutes
Available payment plans shown during checkout

Recently Viewed

Color: 100W for 20-45 Gallon


Features

  • Mylivell 100W aquarium heater, length 9.5 inch, voltage 110-120V, power cord is 4.2ft, suitable for 20-45 gallon fish betta tank and turtle tanks and other small fish tanks or fish bowl, can be used in seawater and freshwater.
  • Easy to Set Temperature: With the aquarium heater, adjusting the water temperature is a breeze. Simply turn the knob on top of the heater to set your desired temperature, ranging from 63F to 89F. The heating indicator light ensures you know when the heater is active, and it will automatically turn on and off to maintain the set temperature, making it perfect for any fish tank, whether it's a 5 gallon fish tank heater or a 75 gallon aquarium heater.
  • Sturdy and Durable: Say goodbye to worries about a broken heater. Our aquarium heater is crafted with shatterproof, corrosion-resistant, and wear-resistant microcrystalline glass (glass-ceramics). It's suitable for both freshwater and saltwater environments. The heating element is made from nickel-chromium alloy, ensuring superior heat transfer and an extended service life. Ideal for a range of tank sizes, from a small fish tank heater to a 300W aquarium heater for larger setups.
  • Accurate Electronic Temperature Control: Our fish tank heater offers high sensitivity and precision, reducing temperature errors to 1.8F. The Mylivell aquarium heater features a stepwise heating mode that automatically turns on and off to maintain the set temperature, helping to reduce electricity consumption. Whether you need a heater for a 5 gallon fish tank or a 55 gallon aquarium heater, our product ensures your fish enjoy a warm and comfortable environment while saving on energy costs.
  • Super Long Power Cord & ONE YEAR WARRANTY: The power cord of this heater is 4.2ft, longer than most other heaters on the market, eliminating the need for an extension cord even if your fish tank is far from the socket. Ensure the heater is completely submerged in water when in use. This versatile heater is suitable for a wide range of tank sizes, from a 10 gallon fish tank heater to an aquarium heater for a 75 gallon tank, and comes with a one-year warranty for your peace of mind.

Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 11.6 x 2.7 x 1.5 inches; 7.83 ounces


Item model number ‏ : ‎ ML0373


Date First Available ‏ : ‎ August 28, 2018


Manufacturer ‏ : ‎ Mylivell


Best Sellers Rank: #34,847 in Pet Supplies (See Top 100 in Pet Supplies) #88 in Aquarium Heaters


#88 in Aquarium Heaters:


Customer Reviews: 4.4 4.4 out of 5 stars 3,864 ratings


Item Weight: 7.8 ounces


Manufacturer: Mylivell


Item model number: ML0373


Date First Available: August 28, 2018


Item Package Dimensions L x W x H: 10.67 x 2.83 x 1.73 inches


Item Dimensions LxWxH: 11.6 x 2.7 x 1.5 inches


Brand Name: Mylivell


Target Audience Keyword: fish


Color: 100W for 20-45 Gallon


Size: 100W for 25-45 Gallon Fish Tank


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Apr 10

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Beware! Glass Broke while in Tank!
Color: 100W for 20-45 Gallon
Review Image by Devon Howard Devon Howard
Review Image by Devon Howard Devon Howard
Review Image by Devon Howard Devon Howard
I received my heater on the 20th and it was in good condition and worked great. It kept the water temperature at a set 78degrees....BUT TODAY....only 6 days later, when I was doing my 50% water change, I came to find out that the glass had popped! Fortunately non of the glass had broken off while inside of the tank. Only once I removed it, did it finally fall apart. I a very disappointed that this happened and my husband and I do not understand why it happened. It was placed by the filter so that a constant flow of water would move pass it as recommended. So what would cause it to pop. In my opinion, it is really unsafe for aquariums. ****UPDATE**** Two days after posting my review I was contacted by the Mylivell seller though email to rectify the problem. I am highly satisfied with their costumer service and professionalism. They were very sincere and prompt in their replies. As of right now, I have the new heater in our 36gal. It has been six days since the setup of our new tank and the heater appears to be doing fine. Just as the previous heater did, this one is also keeping the water at the set temperature. My husband and I genuinely hope that the popping of the glass tube on the previous heater was just an isolated event and will not happen again. But If another issue should occur I will be sure to post an update.1/17/20 ... show more
Reviewed in the United States on November 26, 2019 by Devon Howard Devon Howard
    • Great deal
Color: 200W for 40-65 Gallon
Good deal, works great and turns on and off correctly when it gets up to temp. Temperature settings knob is a bit confusing but works as intended and looks really good in tank.
Reviewed in the United States on July 20, 2024 by Amazon Customer
    • Not raising temp above 72 in a 15 gallon tank
Color: 100W for 20-45 Gallon
100 watt Mylivell heater not raising temp above 72. i have checked with thermometer comparing against other tanks so the thermometer is good. I have changed electrical receptors. I'll have to put old 50 watt heater back in. On Dec. 16th they said they would send a replacement. As of Jan 9th I have not seen a replacement or heard from them again. I did receive my replacement and it works great. ... show more
Reviewed in the United States on December 12, 2019 by Tim Maag
    • Terrific aquarium heater
Color: 100W for 20-45 Gallon
Review Image by MikePhilbrook MikePhilbrook
I have this Mylivell heater in my 10-gallon aquarium. It is very accurate, easy-to-use, and hasn't budged from the spot I put it in originally so the suction cups are great. It keeps an even temperature in my tank and performs flawlessly. I am very happy with the product.
Reviewed in the United States on April 20, 2024 by MikePhilbrook MikePhilbrook
    • Good quality for the price
Color: 50W for 10-25 Gallon
Lasted 4 years and it finally stop working. Pretty good for the price so I ordered another one!
Reviewed in the United States on December 22, 2024 by Amazon Customer
    • This has been working great for over 2 years
Color: 100W for 20-45 Gallon
I got this a while back but didn't bother to review it until now. Initially I was worried about all these off-brand aquarium heaters that significantly cheaper than their more well-known competitors. Quality control is a serious issue for those who are buying equipment to take care of a living animal. Amazingly, this heater is still going strong at 78°F and I haven't had any problems with it overheating or breaking apart. Though I'm not sure this can be said the same for everyone else who got one. There will always be defective units so I'd make sure you put this in an empty tank for a week just to make sure nothing is wrong at first. ... show more
Reviewed in the United States on August 18, 2022 by Richard C
    • Works perfectly
Color: 50W for 10-25 Gallon
Love it keep at a perfect temp for my fish .
Reviewed in the United States on May 23, 2024 by Amazon Customer
    • They can be good but unfortunately they can be bad too.
Color: 200W for 40-65 Gallon
Sadly three days after the return window closed, the heater is heating my 36 gal tank only to 72 even though I have it set to 84, I bought the 50 gal tank heater so that it wouldn’t have any problem heating it. But alas…. The other one I got from live well is working without a glitch.
Reviewed in the United States on February 22, 2025 by Isabel G

Can't find a product?

Find it on Amazon first, then paste the link below.