hygger 300 Watt Aquarium Heater

2 customer reviews
5.00 out of 5 based on 2 customer ratings


High-power Quartz heater for medium and large size tanks 30-120 gallons freshwater and saltwater.

Package includes:
1 x Quartz glass heater
1 x IC temperature controller
1 x Thermometer
1 x User manual

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Quickly heat up

With voltage 110-120V/60 Hz, power 300W, US three-pin plug, heater rod length 7.7 inches, hygger 300 Watt Aquarium Heater takes about 3 minutes to heat 3.5 gallons’ water up 3 °F.

Fully submerged

The heater tube and the separate sensitive thermometer must be completely submerged under water all the time. Please unplug it and wait for it to cool down before you remove the heater or do a water change.

Automatically stop and restart heating

It will stop heating when the water temp reaches the set temp. Please note that the water temp may go up 1°F more because of the waste heat. When the water temp is cool down to 1°F lower than the set temp, the heater will restart heating.

Heating indicator light

There are 2 indicator lights below the display screen. The left light will be red when the heater is heating, and the right light will be green when it stops heating.

Over temperature protection

The 300W/500W aquarium heater will automatically shut off if the water temp is over 97°F, and will automatically turn to a normal work state when the water temp is lower than 95°F.

Directions for Use

How to Set the Temperature?

1. Press the button on the controller over and over, the set temp digits will go circularly from 61 °F to 90 °F.
2. After you set it to the digit you want, stop and wait for the led flashing 3 times.
3. The setting is done and the led will go on display the water temperature.

Please note the LED display will only show Fahrenheit degrees.

Dos and Don’ts

1. Please don’t plug in before the heater is well installed.
2. Please wait for about 6 seconds before you set the temperature.
1. Keep the heater and thermometer fully submerged all the time, or the plastic guard will be melted if the heater exposes to the air when it’s heating or not cooling down.
3. Place the heater vertically or horizontally near the water intake or on the way of water flow.
4. Don’t bury the heater under gravel, mud, or sand.
5. Keep tank water circulation as far as possible.
6. Place the thermometer far away from the heater, and keep the temp controller away from the water.
7. Wait for the heater tube to cool down before moving it or changing the water.

Cautions: please keep the 300 watt heater fully underwater all the time, the plastic guard will be melted if the heater exposes to the air when it’s heating or not cooling down.

Note: When the weather gets cold and room temperature is lower than 50°F, please use a larger 500-watt heater than normally recommended.


Power: 300 W (for 30-60 gallons fish tanks) and 500 W (for 60-120 gallons fish tanks)
Voltage:110-120 V
Heater Tube Material: Quartz glass
Plug: Three-pin US plug
Temp control range: 61-90°F
Frequency: 60 Hz
Heater Rod Length: 7.7 inches
Heater Power Cord Length: 6 Feet
Controller Power Cord Length: 5 Feet
Thermometer Cord Length: 4.6 Feet

Additional information


300W(30-60 Gallon), 500W(60-120 Gallon)

2 reviews for hygger 300 Watt Aquarium Heater

  1. Douglas Cantrell

    Excellent, Long Lasting Heaters. I purchased three of these heaters four years ago. No problems with them. All four are still going strong. Easy to set up and adjust aquarium temperature. Highly recommended.

  2. Sam

    Nice Heater, Good Price.

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