Cobalt Aquatics

Accu-Therm Submersible Heater

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Fully submersible, ceramic aquarium heater from Cobalt Aquatics.

  • Easy to set thermostat with ON/OFF indicator light
  • Triac-equipped to turn heater ON/OFF at lower voltage
  • Magnetic contacts ensure positive contact and release of the thermostat switch every time
  • Tube made of Borosilicate glass for superior heat and shock resistance
  • High quality ceramic heat radiator provides even heat distribution
  • Freshwater and saltwater aquariums
  • Accurate to ±2ºF


Model No.Maximum Aquarium SizeDimensions (LxWxH)
25W 6 Gallons 1.5" x 1.75" x 9.75"
50W 12 Gallons 1.5" x 1.75" x 9.75"
75W 20 Gallons 1.5" x 1.75" x 11"
100W 29 Gallons 1.5" x 1.75" x 11"
150W 40 Gallons 1.5" x 1.75" x 12.5"
200W 55 Gallons 1.5" x 1.75" x 12.5"
250W 70 Gallons 1.5" x 1.75" x 14.75"
300W 80 Gallons 1.5" x 1.75" x 14.75"




 Owners Manual

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Product Questions

What watt heater can I get for a 75 gallon tank
Question by: Mitchell Wong on Nov 13, 2017, 12:59 PM
We would suggest going with a 250-watt model or two 150 watt units. Usually, two heaters is better than one because if one fails then you will have a backup that will help keep things from swinging too quickly.
Answer by: Charlie on Nov 24, 2017, 2:06 PM
How is the temp set... does it have "high" and "low" settings or exact temp (example 75 degress) settings?
Question by: tonya on Jul 25, 2016, 5:17 AM
Hi there,
The Accu-Therm Heaters have a single dial setting on the top of the heater that you can turn to your desired temp. The heater will be able to keep a steady temperature that is accurate to ±2ºF
Answer by: Charlie on Jul 25, 2016, 8:56 AM
what watt heater for 120 gal with 30 gal sump
Question by: Daniel on Nov 23, 2013, 10:32 AM
Hi Daniel,
The 200w heater will heat up to about 55g of water. Your tank is about 3x that so you would need 3 of the 200w heaters.
Answer by: Bulk Reef Supply on Nov 23, 2013, 10:32 AM