---
product_id: 28449890
title: "Cobalt Aquatics Accu Therm Submersible Heaters"
brand: "brand: cobalt aquatics"
price: "¥14309"
currency: JPY
in_stock: true
reviews_count: 9
url: https://www.desertcart.jp/products/28449890-cobalt-aquatics-accu-therm-submersible-heaters
store_origin: JP
region: Japan
---

# Cobalt Aquatics Accu Therm Submersible Heaters

**Brand:** brand: cobalt aquatics
**Price:** ¥14309
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Cobalt Aquatics Accu Therm Submersible Heaters by brand: cobalt aquatics
- **How much does it cost?** ¥14309 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/28449890-cobalt-aquatics-accu-therm-submersible-heaters)

## Best For

- brand: cobalt aquatics enthusiasts

## Why This Product

- Trusted brand: cobalt aquatics brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Size:100 Watts




























Cobalt Aquatics accu-therm fully submersible heaters feature an easy to set thermostat with and on/off indicator light that is triac equipped that turns the heater on and of at lower voltage, and magnetic contacts that ensure positive contact and release of the thermostat switch every time. All of These features are have been engineered to extend life and reliability of the thermostat and ultimately the heater. The tube is made of borosilicate glass for superior heat and shock resistance and surrounds a high quality ceramic heat radiator that provides even and the best heat distribution from the heating elements. Perfect for freshwater and saltwater aquariums. Accurate to 2°. available in 25 - 300 watt sizes.

## Features

- Fully submersible
- Triac equipped thermostat turns heater on and off at lower voltage to extend life
- 3 year warranty.

## Images

![Cobalt Aquatics Accu Therm Submersible Heaters - Image 1](https://images-na.ssl-images-amazon.com/images/I/71-U7UV9DXL.jpg)
![Cobalt Aquatics Accu Therm Submersible Heaters - Image 2](https://images-na.ssl-images-amazon.com/images/I/31Yi81xfeHL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐ 







  
  
    Heater exploded, company blames me, don’t waste your money!!
  

*by S***3 on Reviewed in the United States on May 10, 2020*

I purchased this heater in March, and within ONE WEEK, I heard a HUGE explosion! The heater literally EXPLODED like a bomb!! It smelled like a fire, and LUCKILY I was home or else I’m relatively certain the house would have burned down! I contacted Cobablt(the manufacturer) and they told me it was “consumer error” b/c I had a water/air interface when using the heater. The heater was ENTIRELY SUBMERGED the whole time, there was no ERROR on my part! I have two more of these same heaters, all being used the SAME WAY! I submitted a report to the Consumer Product Safety Commission, it was published & then the manufacturer submitted a comment saying I had mis-used the device & CAUSED it to fail! NO, that did NOT happen. Suffice to say, the report on the CPSC website was subsequently removed! I’ll NEVER use one of these heaters AGAIN! Luckily, there weren’t any jellyfish in the aquarium when the heater exploded. Buyer BEWARE!!

### ⭐ 







  
  
    Extremely Inaccurate, Unreliable
  

*by R***R on Reviewed in the United States on December 4, 2020*

I bought this 200W unit based on Cobalt's reputation for qualify fish foods but that obviously does not extend to hard goods. This thing is garbage.  The thermostat is extremely inaccurate (off by 6 degrees or more) and the unit only heats in short "bursts" (likely to prevent over heating) making it ineffective in holding/maintaining temperatures in even my small 29 gallon QT tank.  Bottom line, I have expensive discus that I am providing critical heating needs for and I can't rely on a product that won't hold temperature and necessitates heat settings 6-8 degrees above actual output.  I will be returning this promptly and not buying any further Cobalt hard goods.

### ⭐ 







  
  
    Temperature is not accurate
  

*by D***H on Reviewed in the United States on December 27, 2019*

Cobalt has such a great reputation but their heaters are a disappointment. I bought this heater in August but didn’t set up my aquarium until the beginning of October. It worked for about 4-6 wk then it died. So I came to amazon and found the same heater at a better price, and because I have Prime, I received it in 2 days. While this heater works , it’s off by 6-7 degrees so I have to monitor it very closely. I have 3 neotherms and they don’t work well either. Temperature in those heaters are 5-7 degrees off as well, so now I’m replacing them with Fluval heaters which have been consistently accurate. I know it’s the heaters that are off because I have 2 types of thermostats in each tank and they agree with each other, but not the cobalt heaters.  I won’t be buying any more Cobalt heaters.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-23*