“Just came home from thanksgiving and my neotherm nuked my whole tank too!! 95 degrees. My daughter is going to be devastated that her fish is dead!”

62% of 8 verified owners recommend the Cobalt Neo-Therm Heater.
Affiliate blogs here say 67% recommend, while the owner-based score is 62%. They earn a commission on every sale — so we show them for transparency but never let them move the score.
The headline score reflects owners (Reddit, enthusiast forums), independent lab tests, and blogs with no affiliate links. YouTube and affiliate blogs are shown for perspective but kept out — hover the i for why.
“Just came home from thanksgiving and my neotherm nuked my whole tank too!! 95 degrees. My daughter is going to be devastated that her fish is dead!”
“My only issue with these, and I have used 4 over the past year and a half, is that the button to change the temp is extremely difficult to push, as you also stated but in addition they all have had failed light indicators.”
“But it keeps my tank at temp just fine since goldfish like cold water and it does not have to heat up much.”
“I prefer the Cobalt Neo-Therms. They are very reliable and have an LED readout of the set and actual temp.”
“I've had two Cobalt Neo-Therm heaters fail on me - strange burning smell followed by the breaker being tripped.”
“I would not use Cobalt neotherm. The first generation all blew up on me.”
“all my saltwater and my non turtle freshwater tanks run Colbalt Neo heaters because A they are sleek, B they have a ton of built in fail safes, C they are shatter proof and D I have heard many stories of in the event the ex blow the manufacture paying out to cover damages of lost live stock.”
“The shatterproof case provides a sense of security, and you'll never see this heater roll off your counter during those occasional cleanings.”
“I would not hesitate to recommend Cobalt Aquatics Neo-Therm to anyone looking for a low profile heater that is both easy to blend into it’s surroundings and offers hassle-free setup while performing as an aquarium heating device should.”
“Accurate and reliable, it’s everything you want in an aquarium heater.”
“I’ve used one for years and never had issues”