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300, 400, 500 & 1000 Watt Aquarium Heaters (80 to 325 Gallon Tanks)
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ViaAqua Quartz 300 Watt Aquarium Heater VA-300Q ViaAqua Quartz 300 Watt Aquarium Heater (VA-300Q)

The ViaAqua Quartz 300 Watt Aquarium Heater is manufactured with high quality, break resistant quartz.

  • 300 Watts. Recommended for tanks up to 80 gallons.
  • Glass construction
  • Fully submersible
  • Suction cups for securing to the aquarium
  • Visible temperature setting
  • For use in fresh and saltwater aquariums
  • 14.5" long (including the control knob)
  • Item # VA-300Q

Our Price: $15.19
Sale Price: $13.59
You save $1.60!
In Stock
Marineland Precision 300 Watt Submersible Heater Marineland Precision 300 Watt Submersible Heater

The Marineland Precision 300 Watt Submersible Heater is perfect for freshwater and marine aquariums. The Marineland Precision 300 Watt Submersible Heater features a thermal safety switch to prevent heater failure during operation. The heater turns off automatically when temperature exceeds pre-set internal parameters and turns back on once it cools down.

Features:

  • 15" tall
  • For aquariums up to 80 gallons (to raise the temp up 15F above ambient temperature)
  • Easy to adjust temperature dial sets temperature 1F with every "click."
  • Thermal Switch: Safety feature prevents heater failure during use. Heater automatically turns off as temperature rises above an internal pre-set and turns back on once it cools down.
  • Mounting Bracket: Advanced mounting bracket securely attaches to glass and provides three window positions allowing temperature display to be viewed from multiple angles.
  • cUL listed

Our Price: $22.99
In Stock
AquaTop 300W Model GH-300 Submersible Heater AquaTop 300W Model GH-300 Submersible Heater

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. With the highly visible temperature setting, the GH-300W is easy to set and adjust to the desired temperature with the use of the temperature adjustment knob. This powerful heater also has double insulation and is made from high quality insulated glass.

Features:

  • 300 Watts
  • 14 inches long
  • For tanks up to 75 gallons
  • Suitable for fresh and saltwater use
  • Suction cups included
  • High quality insulated glass construction

Our Price: $23.99
In Stock
Lifegard Aquatics 300 Watt Adjustable Quartz Glass Aquarium Heater Lifegard Aquatics 300 Watt Adjustable Quartz Glass Aquarium Heater

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

Features:

  • Adjustable from 68-88 F
  • Length: 15.15"
  • 300 Watts. For aquariums from 110 to 150 gallons (assuming the temp needs be adjusted no more than 10 degrees)
  • UL Listed
  • Quartz glass tube with bi-metal construction
  • LED power light (red in heating mode, green when temp achieved & purple when outside of water)
  • Thermal protection. The heater will automatically shut off if outside of water.
  • Rubber suction cup holders included
  • Manufacturer part# R800107

Our Price: $24.92
In Stock
Hydor Theo 300 Watt Aquarium Heater Hydor Theo 300 Watt Aquarium Heater

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

  • Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
  • Free positioning in aquarium with supplied suction cups
  • Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage
  • Temperature range: 70-94 degrees Fahrenheit

Our Price: $27.79
Sale Price: $25.19
You save $2.60!
In Stock
Hydor 400 Watt Theo Aquarium Heater Hydor 400 Watt Theo Aquarium Heater

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

  • Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube
  • Free positioning in aquarium with supplied suction cups
  • Self-limiting: the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage

Our Price: $29.39
Sale Price: $26.69
You save $2.70!
In Stock
Eheim Aquarium Heater, 300 Watt Eheim Aquarium Heater, 300 Watt


  • Perfect for freshwater or saltwater use
  • For tanks from 159-264 gallons
  • Fully submersible
  • 19.75" X 1.5"
  • 6 foot double insulated power cord
  • Temperature is adjustable from 65F and 93F with an easy to adjust thermostat
  • TrueTemp dial with readjustment ring allows the user to calibrate the heater for a precise temperature reading
  • Thermo safety control in case the tank runs dry. The heater will shut off when out of the water.
  • On/off indicator light
  • Includes clamp with 2 suction cups
  • Made of shatter-proof glass

Our Price: $30.75
In Stock
Marineland Precision 400 Watt Submersible Heater Marineland Precision 400 Watt Submersible Heater

The Marineland Precision 400 Watt Submersible Heater is perfect for freshwater and marine aquariums. The Marineland Precision 400 Watt Submersible Heater features a thermal safety switch to prevent heater failure during operation. The heater turns off automatically when temperature exceeds pre-set internal parameters and turns back on once it cools down.

Features:

  • 18" tall
  • For aquariums up to 125 gallons (to raise the temp up 15F above ambient temperature)
  • Easy to adjust temperature dial sets temperature 1F with every "click."
  • Thermal Switch: Safety feature prevents heater failure during use. Heater automatically turns off as temperature rises above an internal pre-set and turns back on once it cools down.
  • Mounting Bracket: Advanced mounting bracket securely attaches to glass and provides three window positions allowing temperature display to be viewed from multiple angles.
  • cUL listed

Our Price: $37.99
In Stock
ViaAqua NEW LED Titanium Heater 300 Watts ViaAqua NEW LED Titanium Heater, 300 Watts

The ViaAqua LED Titanium Heater, 300 Watts, is the latest version of ViaAqua Titanium heaters. This version features an LCD temperature readout.

Features:

  • Recommended for tanks up to 80 gallons
  • Titanium heating element
  • Fully submersible
  • Adjustable temperature setting
  • Remote temperature sensor (9" cable)
  • For use in fresh & saltwater
  • Temperature range: 68-93F

      Our Price: $45.39
      (Out of Stock)
AquaTop D2HT 300 Watt Digital Aquarium Heater AquaTop D2HT 300 Watt Digital Aquarium Heater

The AquaTop D2HT 300 Watt Digital Aquarium Heater is suitable for both freshwater and saltwater applications. It comes equipped with a highly visible dual temperature display, an easy to use temperature control button, and a separately attached temperature sensor, providing a stable temperature environment for aquatic life. The fully submersible features allow for more flexibility in placement. The D2HT Series is also equipped with memory. This means that after a power outage, the heater will resume your preset temperature settings. No need to reset your temperature controls.

Features:

  • LED display
  • The D2HT-300 300 Watt submersible digital aquarium heater is perfect for 75-100 gallon aquariums.
  • The temperature is adjustable from 65F and 93F using the easy to adjust thermostat
  • Built with high impact safety glass and waterproof insulation
  • The design is compact and is only 14.5 inches long
  • Separately attached temperature sensor
  • Suction cups included
  • Will retain temperature setting during a power outage

Our Price: $54.99
In Stock
Hydor 300W In-Line Heaters, 5/8" Connection Hydor 300W In-Line Heater, 5/8" Connection

The Hydor 300W In-Line Heater, 5/8" Connection, is designed for vertical use in most aquarium applications involving water hose of the specified diameter. The ETH must be used in a vertical manner for correct operation. The most common application is for use with canister filter, however the Hydor 300W In-Line Heater is easily adapted for use in almost any situation where heated aquarium water is required, such as with wet/dry sump pumps. It is easily installed by cutting the tubing and connecting the two parts of the tube to each side of the Heater. It heats with high efficiency by means of an internal heat pump system that avoids temperature variations. For use in freshwater and marine aquariums. Fits most canister filters such as the Hydor Professional and the Fluval canisters with the use of a short section of tubing to complete the connection.

Features:

  • 300W
  • 5/8" Connection
  • Must be used in line. Not submersible.
  • Completely safe
  • No danger of damage if the equipment is left running without water for a short period of time
  • Patented heating element made with the exclusive PTC system. The traditional metal resistor coils have been replaced by a special polymer sheet silk- screened with heating ink
  • Setting of temperature controlled by an electronic circuit with indicator light
  • Connectors suitable for any flexible pipe of all external filters

Our Price: $58.22
In Stock
AquaTop D2HT 450 Watt Digital Aquarium Heater AquaTop D2HT 450 Watt Digital Aquarium Heater

The AquaTop D2HT 450 Watt Digital Aquarium Heater is suitable for both freshwater and saltwater applications. It comes equipped with a highly visible dual temperature display, an easy to use temperature control button, and a separately attached temperature sensor, providing a stable temperature environment for aquatic life. The fully submersible features allow for more flexibility in placement. The D2HT Series is also equipped with memory. This means that after a power outage, the heater will resume your preset temperature settings. No need to reset your temperature controls.

Features:

  • LED display
  • The D2HT-450 450 Watt submersible digital aquarium heater is perfect for 75-100 gallon aquariums.
  • The temperature is adjustable from 65F and 93F using the easy to adjust thermostat
  • Built with high impact safety glass and waterproof insulation
  • The design is compact and is only 15 inches long
  • Separately attached temperature sensor
  • Suction cups included
  • Will retain temperature setting during a power outage

Our Price: $59.99
In Stock