HC-810M Digital Heater Controller

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The HC-810M Finnex controller offers a precision digital control with a digital display for simple and reliable water temperature control*. Water temperature is one of the most critical and yet easily overlooked parameters in your reef tank, so it’s worth investing in a controller that provides easy-to-see readings on water temps and can be set to a tight temperature window.

*Please note that the temperature probe is designed to work in saltwater systems only.



  • Finnex Digital LED Display
  • Dual-relay protection
  • Rated for heating elements up to 800 Watts
  • Memory equipped to resume preset settings
  • Audible alarm


The HC-810M has easily adjustable high/low temperature settings and an audio alert that separates this aquarium heater controller from common aquarium heaters with mechanical temperature dials and on/off switches. You can have extra ease of mind knowing this controller features dual-relays, doubling the protection, and ensuring that the heater will turn off when it’s supposed to. The HC-810M also carries three prong power receptacles that work with all Finnex Titanium Tubes as well as other brand's heating elements. For the utmost in advanced aquarium heater control, the Finnex heater controller checks all the right boxes.



  • Voltage: 100-120V
  • Range: 0-99°F
  • Accuracy: ±2°F
  • Max Load: 800 Watts
  • Overload Fuse: 10A
  • Memory: Yes


What’s Included?

1x Finnex HC-810M Heater Controller

More Information
UPC 4711457830725
WiFi No
Controller Type Heating Only or Cooling Only (Single Stage)
Temperature Range 0°F - 99°F
Additional Notes *The temperature probe is designed to work in saltwater systems only.
Alarms Audible, Visual
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Product Questions

Is there a way to calibrate this controller? Mine has always been about 2 degrees off. Thanks
Question by: Val Stevens on Aug 11, 2022, 9:34 AM
Thanks for the question! Looking at the instruction manual, I do not see any way to calibrate this controller unforutnately. In order to get the desired temperature, add or subtract the 2 degrees when making your settings for desired high, low, and desired temperature settings. Let us know if we can help with anything else!
Answer by: Kyle Thomas (BRS Staff) on Aug 17, 2022, 9:12 AM