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Maintaining the correct temperature for tropical fish may be the single most important factor for a successful aquarium. Since fish do not have the ability to regulate their own body temperature, it is crucial that we provide consistent water temperatures with minimal fluctuations.
The majority of fish cannot cope with stress from constant temperature fluctuations, which leads to a compromised immune system. This increases the probability of avoidable diseases, parasites, and bacterial infections.
Having a properly sized heater is one of the primary requirements for maintaining a healthy aquatic ecosystem.

At AquaCave, we offer some of the best selection and best prices on Aquarium Heaters, Fish Tank Heaters, Titanium, Heater Controllers, and Water Chillers for you marine, reef, and freshwater aquarium.

  • Smart Temp Security Smart Temp Security

    AutoAqua

    Smart Temp Security

    Smart Temp Security Smart Temp Security controls an aquarium heater or chiller within a range of 72℉ to 84℉. A magnetically coupled optical sensor mounts to most smooth surfaces up to 1/2 inch thick.    Plug&Play -...

    $59.99
  • AquaEl ULTRA Heater 50 Watt AquaEl ULTRA Heater 50 Watt

    AquaEl

    AquaEl ULTRA Heater 50 Watt

    AquaEl ULTRA Heater 50 Watt The heater is easy to control using the ONE-TOUCH system that employs a single button surrounded by a ring of LEDs indicating the current and set temperatures. Temperature Regulation Overheat Protection Fully...

    $59.49
  • Finnex HMK-100 Titanium Aquarium Heater - 100 watt Finnex HMK-100 Titanium Aquarium Heater - 100 watt Finnex HMK-100 Titanium Aquarium Heater - 100 watt

    Finnex

    Finnex HMK-100 Titanium Aquarium Heater - 100 watt

    Finnex HMK Titanium Aquarium Heater - 100 watt The Finnex HMK Titanium Aquarium Heater Series Introducing the Finnex HMK Titanium Aquarium Heater - Elevate Your Aquatic World to New Heights of Precision and Safety!   Key Features: 1. Titanium...

    $59.00
  • Finnex HMK-50 Titanium Aquarium Heater - 50 watt Finnex HMK-50 Titanium Aquarium Heater - 50 watt Finnex HMK-50 Titanium Aquarium Heater - 50 watt

    Finnex

    Finnex HMK-50 Titanium Aquarium Heater - 50 watt

    Finnex HMK Titanium Aquarium Heater - 50 watt The Finnex HMK Titanium Aquarium Heater Series Introducing the Finnex HMK Titanium Aquarium Heater - Elevate Your Aquatic World to New Heights of Precision and Safety!   Key Features: 1. Titanium...

    $59.00
  •  Oase Heat-Up 400W Adjustable Heater  Oase Heat-Up 400W Adjustable Heater

    OASE

    Oase Heat-Up 400W Adjustable Heater

    Oase HeatUp 400 Adjustable Heater Accurate temperature adjustments – Temperature scale can be adjusted between 66°F - 90°F. A secondary control knob allows for precise readjustment of the temperature within +/- 2°F Uniform temperature levels –...

    $57.99
  • Eheim ThermoControl Heater E100 watt Eheim ThermoControl Heater E100 watt Eheim ThermoControl Heater E100 watt

    Eheim

    Eheim ThermoControl Heater E100 watt

    Eheim ThermoControl Heater E100 watt With the EHEIM thermocontrol-e heating element your fish get the right temperature even more precisely - in every aquarium. The obvious ideas are often the best. This also applies to the aquarium heating element...

    $55.49
  • Eheim ThermoControl Heater E125 watt Eheim ThermoControl Heater E125 watt Eheim ThermoControl Heater E125 watt

    Eheim

    Eheim ThermoControl Heater E125 watt

    Eheim ThermoControl Heater E125 watt With the EHEIM thermocontrol-e heating element your fish get the right temperature even more precisely - in every aquarium. The obvious ideas are often the best. This also applies to the aquarium heating element...

    $55.49
  • Eheim ThermoControl Heater E150 watt Eheim ThermoControl Heater E150 watt Eheim ThermoControl Heater E150 watt

    Eheim

    Eheim ThermoControl Heater E150 watt

    Eheim ThermoControl Heater E150 watt With the EHEIM thermocontrol-e heating element your fish get the right temperature even more precisely - in every aquarium. The obvious ideas are often the best. This also applies to the aquarium heating element...

    $55.49
  • Finnex HMH 200 Watt Digital Heater Finnex HMH 200 Watt Digital Heater

    Finnex

    Finnex HMH 200 Watt Digital Heater

    Finnex HMH 200 Watt Digital Heater The HMH heater series uses an advanced digital processor that monitors and controls the water temperature in your aquarium. The heating controller receives temperature data from a sensor in the heater tube. The...

    $54.99
  • Fluval T300, 300W Safety Water Heater Fluval T300, 300W Safety Water Heater Fluval T300, 300W Safety Water Heater Fluval T300, 300W Safety Water Heater Fluval T300, 300W Safety Water Heater

    Fluval

    Fluval T300, 300W Safety Water Heater

    Fluval T300, 300W Safety Water Heater T-Series submersible heaters combine electronic accuracy, reliable monitoring, and multiple safety features to easily maintain desired aquarium water temperatures. The 360° indicator light ring displays heat mode...

    $54.99
  • IceCap 400W Titanium Heater Element IceCap 400W Titanium Heater Element IceCap 400W Titanium Heater Element

    IceCap

    IceCap 400W Titanium Heater Element

    IceCap 400W Titanium Heater Element Titanium Aquarium Heater Ensure precise temperature control for your aquarium with our rapid-heating titanium heater element. Bid farewell to temperature fluctuations that can harm your fish and corals, as this...

    $54.99
  • Bubble Magus 4 Cooling Fan Bubble Magus 4 Cooling Fan

    Bubble Magus

    Bubble Magus 4 Cooling Fan

    Bubble Magus 4 Cooling Fan No assembly requiredEasy installation (Clamp mounting bracket) Clamp mounting bracket can fit over aquarium walls up to 1/2" thickExtend Longevity of your lighting systemLow power consumptionAdjustable direction of air...

    $54.95
  • AquaEl ULTRA Heater 25 Watt

    AquaEl

    AquaEl ULTRA Heater 25 Watt

    AquaEl ULTRA Heater 25 Watt The heater is easy to control using the ONE-TOUCH system that employs a single button surrounded by a ring of LEDs indicating the current and set temperatures. Temperature Regulation Overheat Protection Fully...

    $53.99
  • Fluval T200, 200W Safety Water Heater Fluval T200, 200W Safety Water Heater Fluval T200, 200W Safety Water Heater Fluval T200, 200W Safety Water Heater Fluval T200, 200W Safety Water Heater

    Fluval

    Fluval T200, 200W Safety Water Heater

    Fluval T200, 200W Safety Water Heater T-Series submersible heaters combine electronic accuracy, reliable monitoring, and multiple safety features to easily maintain desired aquarium water temperatures. The 360° indicator light ring displays heat mode...

    $53.99
  • Fluval T150, 150W Safety Water Heater Fluval T150, 150W Safety Water Heater Fluval T150, 150W Safety Water Heater Fluval T150, 150W Safety Water Heater Fluval T150, 150W Safety Water Heater

    Fluval

    Fluval T150, 150W Safety Water Heater

    Fluval T150, 150W Safety Water Heater T-Series submersible heaters combine electronic accuracy, reliable monitoring, and multiple safety features to easily maintain desired aquarium water temperatures. The 360° indicator light ring displays heat mode...

    $52.99
  • Oase Heat-Up 300W Adjustable Heater Oase Heat-Up 300W Adjustable Heater

    OASE

    Oase Heat-Up 300W Adjustable Heater

    Oase HeatUp 300 Adjustable Heater Accurate temperature adjustments – Temperature scale can be adjusted between 66°F - 90°F. A secondary control knob allows for precise readjustment of the temperature within +/- 2°F Uniform temperature levels –...

    $51.99
  • Reef Octopus 4" Smart Fan Reef Octopus 4" Smart Fan Reef Octopus 4" Smart Fan Reef Octopus 4" Smart Fan Reef Octopus 4" Smart Fan

    Reef Octopus

    Reef Octopus 4" Smart Fan

    Reef Octopus 3" Smart Fan The Reef Octopus USB Smart Fan will automatically increase or decrease the fan speed depending on the ambient temperature of the area surrounding the thermostat. Makes and excellent choice for aquarium canopies, enclosed stands...

    $51.96
  • Fluval T100, 100W Safety Water Heater Fluval T100, 100W Safety Water Heater Fluval T100, 100W Safety Water Heater Fluval T100, 100W Safety Water Heater Fluval T100, 100W Safety Water Heater

    Fluval

    Fluval T100, 100W Safety Water Heater

    Fluval T100, 100W Safety Water Heater T-Series submersible heaters combine electronic accuracy, reliable monitoring, and multiple safety features to easily maintain desired aquarium water temperatures. The 360° indicator light ring displays heat mode...

    $50.99
  • Finnex HC810-M Digital Controller Finnex HC810-M Digital Controller

    Finnex

    Finnex HC810-M Digital Controller

    HC810M Controller Features:  Precision digital control, maintain water temperature at a constant level Advanced digital heating control technology with adjustable low/high temperature alert setting Automatic shut off overheat protection - when...

    $49.99
  • Finnex HMH 100 Watt Digital Heater Finnex HMH 100 Watt Digital Heater

    Finnex

    Finnex HMH 100 Watt Digital Heater

    Finnex HMH 100 Watt Digital Heater The HMH heater series uses an advanced digital processor that monitors and controls the water temperature in your aquarium. The heating controller receives temperature data from a sensor in the heater tube. The...

    $49.99
  • Finnex HMS 100 Watt Digital Heater Finnex HMS 100 Watt Digital Heater

    Finnex

    Finnex HMS 100 Watt Digital Heater

    Finnex HMS 100 Watt Digital Heater Temperature Steady Low Variance TechnologyThe HMS heater series uses an advanced digital processor that monitors and controls thewater temperature in your aquarium. The heating controller receives temperature data...

    $49.99
  • Finnex HMS 150 Watt Digital Heater Finnex HMS 150 Watt Digital Heater

    Finnex

    Finnex HMS 150 Watt Digital Heater

    Finnex HMS 150 Watt Digital Heater Temperature Steady Low Variance TechnologyThe HMS heater series uses an advanced digital processor that monitors and controls thewater temperature in your aquarium. The heating controller receives temperature data...

    $49.99
  • Fluval T50, 50W Safety Water Heater Fluval T50, 50W Safety Water Heater Fluval T50, 50W Safety Water Heater Fluval T50, 50W Safety Water Heater Fluval T50, 50W Safety Water Heater

    Fluval

    Fluval T50, 50W Safety Water Heater

    Fluval T50, 50W Safety Water Heater T-Series submersible heaters combine electronic accuracy, reliable monitoring, and multiple safety features to easily maintain desired aquarium water temperatures. The 360° indicator light ring displays heat mode...

    $49.99
  • IceCap 300W Titanium Heater Element IceCap 300W Titanium Heater Element IceCap 300W Titanium Heater Element

    IceCap

    IceCap 300W Titanium Heater Element

    IceCap 300W Titanium Heater Element Titanium Aquarium Heater Ensure precise temperature control for your aquarium with our rapid-heating titanium heater element. Bid farewell to temperature fluctuations that can harm your fish and corals, as this...

    $49.99
  • IceCap Dual Magnetic Heater Mount IceCap Dual Magnetic Heater Mount

    IceCap

    IceCap Dual Magnetic Heater Mount

    IceCap Dual Magnetic Heater Mount The IceCap Magnetic Heater Mount securely holds aquarium heater(s) in place while providing adequate space for proper heat dissipation. Available in a single and a dual mount.Magnetic Aquarium Heater Mount The IceCap...

    $49.99
  • IM AUQA Gadget - Helio Element Magnetic Holder IM AUQA Gadget - Helio Element Magnetic Holder IM AUQA Gadget - Helio Element Magnetic Holder

    Innovative Marine

    IM AUQA Gadget - Helio Element Magnetic Holder

    IM AUQA Gadget - Helio Element Magnetic Holder Holder Dimensions: 3.71" L x 2.57" W x 1.70" H Magnet Dimensions: 3.71" L x 0.62" W x 3.72" H Glass Thickness Up To: 12 mm Can Be Used with Heaters Up To: 0.96" D Cell Cast Acrylic Designed for Optimal...

    $47.00
  • Eheim ThermoControl Heater E25 watt Eheim ThermoControl Heater E25 watt Eheim ThermoControl Heater E25 watt

    Eheim

    Eheim ThermoControl Heater E25 watt

    Eheim ThermoControl Heater E25 watt With the EHEIM thermocontrol-e heating element your fish get the right temperature even more precisely - in every aquarium. The obvious ideas are often the best. This also applies to the aquarium heating element...

    $46.99
  • Eheim ThermoControl Heater E50 watt Eheim ThermoControl Heater E50 watt Eheim ThermoControl Heater E50 watt

    Eheim

    Eheim ThermoControl Heater E50 watt

    Eheim ThermoControl Heater E50 watt With the EHEIM thermocontrol-e heating element your fish get the right temperature even more precisely - in every aquarium. The obvious ideas are often the best. This also applies to the aquarium heating element...

    $46.99
  • Eheim ThermoControl Heater E75 watt Eheim ThermoControl Heater E75 watt Eheim ThermoControl Heater E75 watt

    Eheim

    Eheim ThermoControl Heater E75 watt

    Eheim ThermoControl Heater E75 watt With the EHEIM thermocontrol-e heating element your fish get the right temperature even more precisely - in every aquarium. The obvious ideas are often the best. This also applies to the aquarium heating element...

    $46.99
  • Reef Octopus 3" Smart Fan Reef Octopus 3" Smart Fan Reef Octopus 3" Smart Fan Reef Octopus 3" Smart Fan Reef Octopus 3" Smart Fan

    Reef Octopus

    Reef Octopus 3" Smart Fan

    Reef Octopus 3" Smart Fan The Reef Octopus USB Smart Fan will automatically increase or decrease the fan speed depending on the ambient temperature of the area surrounding the thermostat. Makes and excellent choice for aquarium canopies, enclosed stands...

    $46.19
  • Finnex HMAS 500 Watts Titanium Heater with Guard Finnex HMAS 500 Watts Titanium Heater with Guard Finnex HMAS 500 Watts Titanium Heater with Guard

    Finnex

    Finnex HMAS 500 Watts Titanium Heater with Guard

    Finnex HMAS 500 Watts Titanium Heater with Guarder Finnex compact electronic heater are fully submersible. This titanium heaters can be used in both fresh and salt water aquarium. Ultimate design external temperature controller. Built in with automatic...

    $45.99
  • IceCap 200W Titanium Heater Element IceCap 200W Titanium Heater Element IceCap 200W Titanium Heater Element

    IceCap

    IceCap 200W Titanium Heater Element

    IceCap 200W Titanium Heater Element Titanium Aquarium Heater Ensure precise temperature control for your aquarium with our rapid-heating titanium heater element. Bid farewell to temperature fluctuations that can harm your fish and corals, as this...

    $44.99
  • Oase Heat-Up 200W Adjustable Heater Oase Heat-Up 200W Adjustable Heater

    OASE

    Oase Heat-Up 200W Adjustable Heater

    Oase HeatUp 200 Adjustable Heater Accurate temperature adjustments – Temperature scale can be adjusted between 66°F - 90°F. A secondary control knob allows for precise readjustment of the temperature within +/- 2°F Uniform temperature levels –...

    $44.99
  • Cobalt Neo-Glass Submersible Aquarium Heater - 300 Watt Cobalt Neo-Glass Submersible Aquarium Heater - 300 Watt

    Cobalt Aquatics

    Cobalt Neo-Glass Submersible Aquarium Heater - 300 Watt

    Cobalt Neo-Glass Submersible Aquarium Heater - 300 Watt The Cobalt Aquatics Neo-Glass fully submersible electronic heaters bring the legendary Neo-Therm state of the art electronic thermostat technology and reliability to glass heaters with a ±0.7°F...

    $44.95
  • Cobalt Neo-Glass Submersible Aquarium Heater - 250 Watt Cobalt Neo-Glass Submersible Aquarium Heater - 250 Watt

    Cobalt Aquatics

    Cobalt Neo-Glass Submersible Aquarium Heater - 250 Watt

    Cobalt Neo-Glass Submersible Aquarium Heater - 250 Watt The Cobalt Aquatics Neo-Glass fully submersible electronic heaters bring the legendary Neo-Therm state of the art electronic thermostat technology and reliability to glass heaters with a ±0.7°F...

    $44.68
  • Cobalt Neo-Glass Submersible Aquarium Heater - 200 Watt Cobalt Neo-Glass Submersible Aquarium Heater - 200 Watt

    Cobalt Aquatics

    Cobalt Neo-Glass Submersible Aquarium Heater - 200 Watt

    Cobalt Neo-Glass Submersible Aquarium Heater - 200 Watt The Cobalt Aquatics Neo-Glass fully submersible electronic heaters bring the legendary Neo-Therm state of the art electronic thermostat technology and reliability to glass heaters with a ±0.7°F...

    $44.36
  • Cobalt Neo-Glass Submersible Aquarium Heater - 150 Watt Cobalt Neo-Glass Submersible Aquarium Heater - 150 Watt

    Cobalt Aquatics

    Cobalt Neo-Glass Submersible Aquarium Heater - 150 Watt

    Cobalt Neo-Glass Submersible Aquarium Heater - 150 Watt The Cobalt Aquatics Neo-Glass fully submersible electronic heaters bring the legendary Neo-Therm state of the art electronic thermostat technology and reliability to glass heaters with a ±0.7°F...

    $44.00
  • Finnex HMAS 300 Watts Titanium Heater with Guard Finnex HMAS 300 Watts Titanium Heater with Guard

    Finnex

    Finnex HMAS 300 Watts Titanium Heater with Guard

    Finnex HMAS 300 Watts Titanium Heater with Guarder Finnex compact electronic heater are fully submersible. This titanium heaters can be used in both fresh and salt water aquarium. Ultimate design external temperature controller. Built in with automatic...

    $41.99
  • JBJ C-Breeze Nano JBJ C-Breeze Nano

    JBJ

    JBJ C-Breeze Nano

    JBJ C-Breeze Nano The new C-Breeze Nano is designed with a powerful centrifugal fan that quietly cools aquariums with a powerful wide stream of air that speeds up evaporative cooling. The low-profile design allows it to be neatly mounted on the side of...

    $40.00
  • IceCap 100W Titanium Heater Element IceCap 100W Titanium Heater Element IceCap 100W Titanium Heater Element

    IceCap

    IceCap 100W Titanium Heater Element

    IceCap 100W Titanium Heater Element Titanium Aquarium Heater Ensure precise temperature control for your aquarium with our rapid-heating titanium heater element. Bid farewell to temperature fluctuations that can harm your fish and corals, as this...

    $39.99
  • IceCap Single Magnetic Heater mount IceCap Single Magnetic Heater mount IceCap Single Magnetic Heater mount

    IceCap

    IceCap Single Magnetic Heater mount

    IceCap Single Magnetic Heater mount The IceCap Magnetic Heater Mount securely holds aquarium heater(s) in place while providing adequate space for proper heat dissipation. Available in a single and a dual mount.Magnetic Aquarium Heater Mount The...

    $39.99
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