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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.

  • Hanna Checktemp® 1 Digital Thermometer - HI98509

    Hanna Instruments

    Hanna Checktemp® 1 Digital Thermometer - HI98509

    Hanna Checktemp® 1 Digital Thermometer - HI98509 The HI98509 Checktemp® 1 is a high-accuracy thermometer with a 1 m (3.3') flexible, silicone cable connecting the meter and the stainless steel probe. The sharp-tip penetration probe easily...

    $62.99
  • AquaEl ULTRA Heater 75 Watt AquaEl ULTRA Heater 75 Watt

    AquaEl

    AquaEl ULTRA Heater 75 Watt

    AquaEl ULTRA Heater 75 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...

    $61.99
  • Hagen Fluval E 100 Watt Electronic Aquarium Heater Hagen Fluval E 100 Watt Electronic Aquarium Heater

    Fluval

    Hagen Fluval E 100 Watt Electronic Aquarium Heater

    Hagen Fluval E 100 Watt Electronic Aquarium Heater E Series LCD Aquarium Heaters from Fluval are the most advanced submersible aquarium heaters on the market today. Computer-controlled precision and fish-safe design contributes more than ever to the...

    MSRP: $65.99
    $61.99
  • Hagen Fluval E 300 Watt Electronic Aquarium Heater Hagen Fluval E 300 Watt Electronic Aquarium Heater

    Fluval

    Hagen Fluval E 300 Watt Electronic Aquarium Heater

    Hagen Fluval E 300 Watt Electronic Aquarium Heater E Series LCD Aquarium Heaters from Fluval are the most advanced submersible aquarium heaters on the market today. Computer-controlled precision and fish-safe design contributes more than ever to the...

    MSRP: $68.99
    $61.99
  • Finnex HMK-150 Titanium Aquarium Heater - 150 watt Finnex HMK-150 Titanium Aquarium Heater - 150 watt Finnex HMK-150 Titanium Aquarium Heater - 150 watt

    Finnex

    Finnex HMK-150 Titanium Aquarium Heater - 150 watt

    Finnex HMK Titanium Aquarium Heater - 150 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...

    $60.99
  • 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...

    $60.05
  • Finnex HMS 300 Watt Digital Heater Finnex HMS 300 Watt Digital Heater

    Finnex

    Finnex HMS 300 Watt Digital Heater

    Finnex HMS 300 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...

    $59.99
  • Hagen Fluval E 200 Watt Electronic Aquarium Heater Hagen Fluval E 200 Watt Electronic Aquarium Heater

    Fluval

    Hagen Fluval E 200 Watt Electronic Aquarium Heater

    Hagen Fluval E 200 Watt Electronic Aquarium Heater E Series LCD Aquarium Heaters from Fluval are the most advanced submersible aquarium heaters on the market today. Computer-controlled precision and fish-safe design contributes more than ever to the...

    MSRP: $66.99
    $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
  • 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...

    $57.74
  • 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...

    $57.74
  • Finnex HC-820M Digital Heater Controller Finnex HC-820M Digital Heater Controller

    Finnex

    Finnex HC-820M Digital Heater Controller

    Finnex HC-820M Digital Heater Controller +Sensor The HC-820M Finnex heater controller uses an advanced digital processor that monitors and controls the water temperature in your aquarium. The heating controller receives temperature data from the remote...

    Was: $69.99
    Now: $54.99
  • Finnex HC-820W Digital Heater Controller Finnex HC-820W Digital Heater Controller

    Finnex

    Finnex HC-820W Digital Heater Controller

    Finnex HC-820W Digital Heater Controller 1000 Watt Max Output Load with Dual Relay Protection 1/10th Degree Temperature Calibration 3 Digit Digital Display & Control Over Heating Audio Alert Temperature Saving Memory Protection ± .5°F...

    Was: $69.99
    Now: $54.99
  • 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
  • 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
  • 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...

    $54.95
  • 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...

    $54.95
  • 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...

    $54.95
  • 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...

    $54.27
  • 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
  • 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...

    $51.96
  • Lifegard Digital Thermometer / Hygrometer Lifegard Digital Thermometer / Hygrometer

    Lifegard

    Lifegard Digital Thermometer / Hygrometer

    Lifegard Digital Thermometer / Hygrometer FEATURES: Large Face Digital Thermometer Displays Inside (Room) & Outside (Aquarium ir Greenhouse) Temperature Degree F or Degree C (Accurancy: +/-1 Degree C) Humidity (Accurancy: +/-5%...

    $51.95
  • 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

    DISCONTINUED - Replaced with Finnex HC-910M 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...

    $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
  • 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
  • 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...

    $46.19
  • 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...

    $46.19
  •  250W Jager Aquarium Heater   250W Jager Aquarium Heater   250W Jager Aquarium Heater   250W Jager Aquarium Heater

    Eheim

    250W Jager Aquarium Heater

    250W Jager Aquarium Heater Jager has over 50 years of experience manufacturing high quality aquarium heaters. TheJager heaters are recognizable by millions of satisfied customers around the world. All Jager heaters are black and have a 6' double...

    $44.99
  • 200W Jager Aquarium Heater 200W Jager Aquarium Heater 200W Jager Aquarium Heater

    Eheim

    200W Jager Aquarium Heater

    200W Jager Aquarium Heater Jager has over 50 years of experience manufacturing high quality aquarium heaters. The Jager heaters are recognizable by millions of satisfied customers around the world. All Jager heaters are black and have a 6' double...

    $44.99
  • 300W Jager Aquarium Heater 300W Jager Aquarium Heater 300W Jager Aquarium Heater 300W Jager Aquarium Heater

    Eheim

    300W Jager Aquarium Heater

    300W Jager Aquarium Heater Jager has over 50 years of experience manufacturing high quality aquarium heaters. The Jager heaters are recognizable by millions of satisfied customers around the world. All Jager heaters are black and have a 6' double...

    $44.99