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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
AquaEl 300W Platinum Aquarium Heater AquaEl 300W Platinum Aquarium Heater

Product Code: RAE38011
The AquaEl 300W Platinum Aquarium Heater is an innovative glass heater. It's equipped with a high-precision electronic thermostat. Temperatures can be set in the range between 68 and 94F and are maintained with an accuracy of 0.8 C (+/-0.4 C).

Our Price: $32.60
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
AquaTop 300W Model GH-300 Submersible Heater AquaTop 300W Model GH-300 Submersible Heater

Product Code: RAT01943
The AquaTop 300W Model GH-300 Submersible Heater will maintain a constant and stable temperature. This fully submersible glass heater offers simple and easy installation with the use of the included suction cups and can handle aquariums up to 75 gallons.

Our Price: $34.99
In Stock
Hydor 400 Watt Theo Aquarium Heater Hydor 400 Watt Theo Aquarium Heater

Product Code: RHY00320
Hydor Theo 400 Watt Aquarium Heater is a fully submersible, shatter-proof glass aquarium heater.

Our Price: $37.96
(Out of 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
Hydor Theo 300 Watt Aquarium Heater Hydor Theo 300 Watt Aquarium Heater

Product Code: RHY00037
Hydor Theo 300 Watt Aquarium Heater is a fully submersible, shatter-proof glass aquarium heater.

Our Price: $40.32
In 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
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 (price includes free shipping!) $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 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