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300 Watt Aquarium Heaters &
400 Watt Aquarium Heaters

The heaters in this category are 300W & 400W and are appropriate for 100 gallon to 133 gallon aquariums in normal circumstances if only one heater is used. Please take a look at our Aquarium Heater Overview Article for a more information.
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Lifegard Aquatics 300 Watt Adjustable Quartz Glass Aquarium Heater Lifegard Aquatics 300 Watt Adjustable Quartz Glass Aquarium Heater

Product Code: RRL31557
The Lifegard Aquatics 300 Watt Adjustable Quartz Glass Aquarium Heater is a submersible heater safe for both freshwater and saltwater tanks 110 gallons to 150 gallons.

Our Price: $27.72
In Stock
Fluval M300 Watt Submersible Heater Fluval M300 Watt Submersible Heater

Product Code: RHG10787
The Fluval M300 Watt Submersible Heater's range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings. For aquariums up to 80 gallons.

Our Price: $34.95
In Stock
Marineland Precision 300 Watt Submersible Heater Marineland Precision 300 Watt Submersible Heater

Product Code: RML90654
The Marineland Precision 300 Watt Submersible Heater is perfect for freshwater and marine aquariums up to 80 gallons. Features a thermal safety switch to prevent heater failure during operation.

Our Price: $38.80
In Stock
Lifegard Aquatics TWO 200 Watt (400 Watts Total) Pre-Set Quartz Glass Aquarium Heater PLUS Package Lifegard Aquatics TWO 200 Watt (400 Watts Total) Pre-Set Quartz Glass Aquarium Heater PLUS Package

Product Code: RRL31561-Bundle
This package includes TWO Lifegard Aquatics 200 Watt Pre-Set Quartz Glass Aquarium Heaters for a total of 400 watts. Why would you want TWO 200 watt heaters instead of one 400 watt heater? Using more than one heater is advisable because heaters can fail, and having a second heater in the tank will keep your tank temperature from fluctuating wildly if one heater fails. Heater failure can either be one heater not turning off or one heater not turning on.

Our Price: $38.99
(Out of Stock)
Oase HeatUp 300 Watt Aquarium Heater Oase HeatUp 300 Watt Aquarium Heater

Product Code: RBO33805
The Oase HeatUp 300 Watt Aquarium Heater features uniform temperature level thanks to the patented bi-metal technology. Recommended for tanks up to 80 gallons. 14.6" long.

Our Price: $44.55
In Stock
Lifegard Aquatics TWO 150 Watt (300 Watts Total) Adjustable Quartz Glass Aquarium Heater PLUS Package Lifegard Aquatics TWO 150 Watt (300 Watts Total) Adjustable Quartz Glass Aquarium Heater PLUS Package

Product Code: RRL31554-Bundle
This package include TWO Lifegard Aquatics 150 Watt Adjustable Quartz Glass Aquarium Heaters for a total of 300 watts. Why would you want TWO 150 watt heaters instead of one 300 watt heater? Using more than one heater is advisable because heaters can fail, and having a backup heater will keep your tank temperature from fluctuating wildly if one heater fails. Heater failure can either be one heater not turning off or one heater not turning on.

Our Price: $49.99
In Stock
Lifegard Aquatics TWO 200 Watt (400 Watts Total) Adjustable Quartz Glass Aquarium Heater PLUS Package Lifegard Aquatics TWO 200 Watt (400 Watts Total) Adjustable Quartz Glass Aquarium Heater PLUS Package

Product Code: RRL31555-Bundle
This package include TWO Lifegard Aquatics 200 Watt Adjustable Quartz Glass Aquarium Heaters for a total of 400 watts. Why would you want TWO 200 watt heaters instead of one 400 watt heater? Using more than one heater is advisable because heaters can fail, and having a backup heater will keep your tank temperature from fluctuating wildly if one heater fails. Heater failure can either be one heater not turning off or one heater not turning on.

Our Price: $51.99
In Stock
Marineland Precision 400 Watt Submersible Heater Marineland Precision 400 Watt Submersible Heater

Product Code: RML90655
The Marineland Precision 400 Watt Submersible Heater is perfect for freshwater and marine aquariums up to 125 gallons. Features a thermal safety switch to prevent heater failure during operation.

Our Price: $52.32
In Stock
Oase HeatUp 400 Watt Aquarium Heater Oase HeatUp 400 Watt Aquarium Heater

Product Code: RBO77117
The Oase HeatUp 400 Watt Aquarium Heater features uniform temperature level thanks to the patented bi-metal technology. Recommended for tanks up to 106 gallons. 17.3" long.

Our Price (price includes free shipping!) $59.99
In Stock
H2Pro 300W Titanium Heater w/ Controller H2Pro 300W Titanium Heater w/ Controller

Product Code: RMG28882
The H2Pro Titanium Aquarium Heaters are high quality heaters with a remote temperature controller. The large display shows both the current temperature and the set temperature in either celsius or fahrenheit. Wattage: 300W. Length: 11.5".

Our Price (price includes free shipping!) $66.99
In Stock
H2Pro 300 Watt Heater & IceCap Magnet Mount Package H2Pro 300 Watt Heater & IceCap Magnet Mount Package

Product Code: RMG28882-Bundle
This package pairs the H2Pro 300W Titanium Heater w/ Controller & the IceCap Single Magnetic Heater Mount. The H2Pro is appropriate for aquariums from 75-150 gallons and includes a remote sensor and controller. The magnetic heater mount will keep the heater firmly in place, and is superior to suction cups, which will eventually fail.

Our Price (price includes free shipping!) $99.99
In Stock
H2Pro 800W Titanium Heater w/ Controller H2Pro 800W Titanium Heater w/ Controller

Product Code: RMG28884
The H2Pro Titanium Aquarium Heaters are high quality heaters with a remote temperature controller. The large display shows both the current temperature and the set temperature in either celsius or fahrenheit. Wattage: 800W. Length: 14.25".

Our Price (price includes free shipping!) $114.99
In Stock
H2Pro 2X200 Watt Heater & IceCap Double Magnet Mount Package H2Pro 2X200 Watt Heater & IceCap Double Magnet Mount Package

Product Code: RMG28881-Bundle2
This package pairs TWO H2Pro 200W Titanium Heaters w/ Controllers & the IceCap Double Magnetic Heater Mount. The TWO H2Pros together are appropriate for aquariums from 75-150 gallons and and they each include a remote sensor and controller. The magnetic heater mount will keep the heaters firmly in place, and are superior to suction cups, which will eventually fail.

Our Price (price includes free shipping!) $159.99
In Stock