Need Help? Call us at 1-317-895-9005
or email us at

Proudly serving Aquarists since 1996

Finnex Deluxe 300 Watt Heater and 820M Controller Combo

$44.99 was $ 89.99
Item #
Eligible for Free Shipping Program
Out Of Stock



HC-820M Series Overview
1000 Watt Max Output Load with Dual Relay Protection
Out of Water Sensor Protection Audio Alert
1/10th Degree Temperature Calibration
3 Digit Digital Display & Control
Over Heating Audio Alert
Temperature Saving Memory Protection
1.5°F High Precision Accuracy
Temperature Steady Low Variance Technology
The HC-820M controller uses an advanced digital processor that monitors and controls the
water temperature in your aquarium. The heating controller receives temperature data from
the remote sensor in the aquarium. The remote sensor contains no bi-metallic contacts to
arc, corrode or wear out. This allows the HC-820M to have precise control, keeping the water
temperature stable while avoiding wide temperature swings common with low-quality aquar-
ium controllers. The controller displays the current temperature, allowing you to easily make
temperature adjustments on the front panel. Temperature can be adjusted by a tenth of a
The remote sensor also functions as an automatic power cut-off switch. If the water level
drops too low and exposes the temperature sensor to the air, power to the heater tube is
turned off. This prevents over-heating of the aquarium, saving your prized aquarium life from
harm or other hazards.
Maintenance: Secure the out-of-water sensor directly beneath the sensor cord clip,
without any cord slack, and above the heating element at all times. Clean and confirm
the out-of-water sensor is functioning properly every 30 days. Do not use heater if the
out-of-water sensor is inoperative. Refer to the instruction manual for proper maintenance and care
The Titanium Finnex Heaters are corrosion-resistant, extending the life exponentially from saltwater damage.  Virtually unbreakable, especially in comparison with the standard glass aquarium, these tube are built to last.  The ultra heating titanium further provides a stable temperature environment for your aquarium lives and eliminates temperature swings that put stress on the aquarist's live stock. This titanium heaters are suited for both use in fresh and salt water aquarium. Will work well with other controllers accepting 3 prong heating elements. The titanium heating element is also wrapped with a protective heater guard to prevent one's aquatic inhabitants as well as surrounding equipment.  The new TH-S Deluxe Titanium Series also includes suction cups to allow users to secure the titanium element in preferred locations.  
Model Wattage Amp Tank Rating Cord Length Heating Tube Length
300S 300 2.7 40-80G 74" 10"
500S 500 4.5 70-130G 73.5" 14"
800S 800 9.0 140-265G 73" 16.5"
Please Note: Additional heating units may be required and discouraged from using in extraordinary setups (where warranty may be void) not limited to:  Applications outside of standard aquarium use, basement setups, garage setups, ponds, outdoor use, greenhouses, extreme temperature conditions, etc.

Customer Reviews

You must be logged in to post a product review.

Garbage May 23, 2024
These controllers are garbage. The SECOND one was purchased and didn’t even last 6 months. First lasted about as long.