Cobalt Aquatics Neo-Therm PRO Submersible Aquarium Heater

By Cobalt Aquatics
Rated 3.6818 out of 5 stars


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$47.80Chewy Price
$87.67Chewy Price

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This Item – Cobalt Aquatics Electronic Neo-Therm Pro Submersible Aquarium Heater, 25-Watt
Rated 3.6818 out of 5 stars
$47.80Chewy Price

Spend $100, Get $30 eGift Card with code: FALL

CaribSea Eco-Complete Planted Aquarium Substrate, Black, 20-lb bag
Rated 4.5556 out of 5 stars
$29.99Chewy Price

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Total Price: $77.79

About This Item


  • Electronic, fully submersible aquarium heater is great for freshwater tanks, saltwater tanks, and terrariums.
  • Modern, flat design features a shatterproof case and a one-touch system that is easy to setup.
  • Advanced electronic thermostat is accurate within a plus/minus range of 0.5 degrees.
  • The LED display shows both the set temp and aquarium temp simultaneously.
  • Built-in thermal protection circuitry shuts down before it can overheat for supreme safety and reliability.

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Play Video: Learn More About Cobalt Aquatics From Our Team of Experts
Learn More About Cobalt Aquatics From Our Team of Experts

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Fish TypeMarine Fish, Tropical FreshwaterMarine Fish, Tropical FreshwaterBetta, Cichlid, Goldfish, Marine Fish, Tropical FreshwaterMarine Fish, Tropical FreshwaterMarine Fish, Tropical Freshwater
Aquarium TypeSaltwater, FreshwaterFreshwaterSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, Freshwater
MaterialPlasticPlastic, PolypropylenePlasticPlasticPlastic

Questions & Answers

4 Customer Questions

is it plastic and glass safe to small fish and will it explode and work ifit doesn't are there returns?
Answer by ChewyJan 11, 2022
The Neotherm Pro heaters are resin based and will not fracture like normal glass heaters. They are designed to be fully submerged and should not be exposed to the air, similar to their standard Neotherm heaters. They are safe to use in glass, plastic, or acrylic tanks.

dose it go with the cobalt aqurium and will it explode is it safe for nano fish like neon tetras scarlet badis
Answer by ChewyJan 06, 2022
This heater features a built-in thermal protection circuit that shuts down the heater before it can overheat, and the shatterproof casing is virtually indestructible. This is designed for any freshwater, marine, and reef tanks and terrariums.

What watt would be best for 75 gallon salt water
Answer by ChewyMar 09, 2023
A 75-gallon tank would need 150 to 450 watts.

Will this heater be able to stand up to an Oscar?
Answer by ChewyJan 23, 2023
This heater will be able to stand up to an Oscar.

ReviewsWrite a Review

Rated 3.6818 out of 5 stars
22 Ratings
Would recommend to a friend

22 Customer Reviews

Rated 2 out of 5 stars
By Corydoras on Apr 28, 2023

Good heater when it works.

I have had a 50% success rate with these heaters. Chewy graciously replaced a 200W that was stuck on a high temp. The 200W replacement works ok. I have a 75 W that works but is stuck on 74 degrees. Another 75W works but is difficult to adjust. Another issue I have with this heater model is that the suction cups to the mounting bracket fall off to easily. Not planning to buy these again. Nice concept but I expect better quality given the price.

Rated 1 out of 5 stars
By momabear on May 5, 2023

not Happy1

I don't Like this fish tank heater I read over the Instructions a few times but I can not get the temp to go up I need it set at 82 degrees.

Rated 5 out of 5 stars
By imoutside on Feb 20, 2023

Finally Found it!

been searching for a flat, adjustable heater for my Nano reef. This is it! Finally, I found it. Now, my fish don't have to suffer the heat of a preset and me rushing to make sure they don't overheat. The "reef" life is happy, healthy, and no longer suffering buffering.

Rated 5 out of 5 stars
By critterguy on Dec 21, 2022

Really Happy with Cobalt's Heater

Product is slim, uses buttons instead of the inaccurate and odd twist you find on some cheaper marketplace products. It's very small-- perfect for my 10 gallon tank-- and feels well constructed in a way other heaters do not. A great buy!

Rated 2 out of 5 stars
By Susieqfoofoo on Dec 23, 2022

Temp is off

It reads about 4 degrees below what actual water temp is. I have it set at 82 degrees, but it heats to 78 degrees.

Rated 1 out of 5 stars
By Leoandmom on Jan 2, 2023

Worked only for 3 days

Worked great for 3 days but now it is not heating the tank at all even though the LEDs show otherwise

Rated 5 out of 5 stars
By fischlady on Nov 1, 2022

Simple but great

I'm very happy with the Colbalt Aquatics heater. It is reliable, easy to read, has a slim profile in my tank. I've had a few other heaters and this one is by far my favorite.

Rated 5 out of 5 stars
By Bettablue on Jul 31, 2022

Cobalt Neo-therm Pro Heater Is All About Accuracy!

This heater is the real deal! I have a digital and glass thermometer in my tank to confirm accuracy and this heater is spot on! This heater alerts you when it is above or below the temperature you have it programmed on by half a degree and is designed to internally adjust the wattage to warm your tank, which is key, from water temperature changing too quickly which is a major cause of your fish getting sick and possibly lossing them. Their webb site will help better explain this dynamic with wattage output! Slim design to fit anywhere in tank! I highly recommend this product!

Rated 2 out of 5 stars
By Sandy on Aug 14, 2022

Did Not Work

Purchased this heater based on all of the great reviews. However, it would not heat the tank. I tried setting it at 78 degrees but the temp only reached 76. Then I set it to 80 degrees and the temp only went to 77.1. I called Chewy and they refunded my money. Using my old Aqueon heater now and it is holding steady at my desired temp. Not sure if I will try another Cobalt.

Rated 1 out of 5 stars
By Wetpets on Sep 26, 2022

6 months later no good

Bought for aquarium, 6 months later the unit has the 78 degree light does not come on. Change to 80 degree and now can not change to any other temperature. Disappointed only last 6 months