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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.

  • 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 - 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
  • IceCap 50W Titanium Heater Element IceCap 50W Titanium Heater Element IceCap 50W Titanium Heater Element

    IceCap

    IceCap 50W Titanium Heater Element

    IceCap 50W 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...

    $40.41
  • 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
  • 100W Jager Aquarium Heater 100W Jager Aquarium Heater 100W Jager Aquarium Heater 100W Jager Aquarium Heater 100W Jager Aquarium Heater

    Eheim

    100W Jager Aquarium Heater

    100W 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...

    $39.99
  • 150W Jager Aquarium Heater 150W Jager Aquarium Heater 150W Jager Aquarium Heater 150W Jager Aquarium Heater

    Eheim

    150W Jager Aquarium Heater

    150W 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...

    $39.99
  • Oase Heat-Up 150W Adjustable Heater Oase Heat-Up 150W Adjustable Heater

    OASE

    Oase Heat-Up 150W Adjustable Heater

    Oase HeatUp 150 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 –...

    $39.99
  • Bubble Magus 2 Cooling Fan Bubble Magus 2 Cooling Fan

    Bubble Magus

    Bubble Magus 2 Cooling Fan

    Bubble Magus 2 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...

    $39.95
  • Cobalt Neo-Glass Submersible Aquarium Heater - 100 Watt Cobalt Neo-Glass Submersible Aquarium Heater - 100 Watt

    Cobalt Aquatics

    Cobalt Neo-Glass Submersible Aquarium Heater - 100 Watt

    Cobalt Neo-Glass Submersible Aquarium Heater - 100 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...

    $39.10
  • Hagen Fluval M 200 Watt Submersible Aquarium Heater

    Fluval

    Hagen Fluval M 200 Watt Submersible Aquarium Heater

    Hagen Fluval M 200 Watt Submersible Aquarium Heater Unique reflective technology goes into each Fluval M Series Aquarium Heater. This advanced feature helps your heater "vanish" into your aquascape. Other features include an easy-to-adjust temperature...

    $38.99
  • Hagen Fluval M 300 Watt Submersible Aquarium Heater

    Fluval

    Hagen Fluval M 300 Watt Submersible Aquarium Heater

    Hagen Fluval M 300 Watt Submersible Aquarium Heater.Unique reflective technology goes into each Fluval M Series Aquarium Heater. This advanced feature helps your heater "vanish" into your aquascape. Other features include an easy-to-adjust temperature...

    $38.99
  • Cobalt Neo-Glass Submersible Aquarium Heater - 50 Watt Cobalt Neo-Glass Submersible Aquarium Heater - 50 Watt

    Cobalt Aquatics

    Cobalt Neo-Glass Submersible Aquarium Heater - 50 Watt

    Cobalt Neo-Glass Submersible Aquarium Heater - 50 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...

    $38.62
  • Oase Heat-Up 100W Adjustable Heater Oase Heat-Up 100W Adjustable Heater

    OASE

    Oase Heat-Up 100W Adjustable Heater

    Oase HeatUp 100 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 –...

    $37.99
  • Teco Conveyor Extension Piece Teco Conveyor Extension Piece

    TECO us

    Teco Conveyor Extension Piece

    Teco Conveyor Extension Piece Each extension piece extends the rotating conveyor manifold featured on TECO's TANK TK-500, TK-1000 and TK-2000 aquarium chillers. Chillers can overheat themselves when they are placed inside a cabinet or confined space,...

    $36.00
  • Hagen Fluval M 100 Watt Submersible Aquarium Heater

    Fluval

    Hagen Fluval M 100 Watt Submersible Aquarium Heater

    Hagen Fluval M 100 Watt Submersible Aquarium Heater   Unique reflective technology goes into each Fluval M Series Aquarium Heater. This advanced feature helps your heater "vanish" into your aquascape. Other features include an easy-to-adjust...

    $35.99
  • Hagen Fluval M 150 Watt Submersible Aquarium Heater.

    Fluval

    Hagen Fluval M 150 Watt Submersible Aquarium Heater

    Hagen Fluval M 150 Watt Submersible Aquarium Heater.Unique reflective technology goes into each Fluval M Series Aquarium Heater. This advanced feature helps your heater "vanish" into your aquascape. Other features include an easy-to-adjust temperature...

    $35.99
  • Hagen Fluval M 50 Watt Submersible Aquarium Heater.

    Fluval

    Hagen Fluval M 50 Watt Submersible Aquarium Heater

    Hagen Fluval M 50 Watt Submersible Aquarium Heater.Unique reflective technology goes into each Fluval M Series Aquarium Heater. This advanced feature helps your heater "vanish" into your aquascape. Other features include an easy-to-adjust temperature...

    $35.99
  • 50W Jager Aquarium Heater 50W Jager Aquarium Heater 50W Jager Aquarium Heater 50W Jager Aquarium Heater

    Eheim

    50W Jager Aquarium Heater

    50W 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...

    $34.99
  • 75W Jager Aquarium Heater 75W Jager Aquarium Heater 75W Jager Aquarium Heater 75W Jager Aquarium Heater

    Eheim

    75W Jager Aquarium Heater

    75W 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...

    $34.99
  • Finnex HPC 100 Watt Digital Quartz Glass Heater Finnex HPC 100 Watt Digital Quartz Glass Heater

    Finnex

    Finnex HPC 100 Watt Digital Quartz Glass Heater

    Finnex HPC 100 Watt Digital Quartz Glass Heater The HPC heater series is a glass heater that uses an advanced digital processor that monitors and controls the water temperature in your aquarium. The heating controller receives temperature data from the...

    $34.99
  • Finnex HPC 200 Watt Digital Quartz Glass Heater Finnex HPC 200 Watt Digital Quartz Glass Heater

    Finnex

    Finnex HPC 200 Watt Digital Quartz Glass Heater

    Finnex HPC 200 Watt Digital Quartz Glass Heater The HPC heater series is a glass heater that uses an advanced digital processor that monitors and controls the water temperature in your aquarium. The heating controller receives temperature data from the...

    $34.99
  • Finnex HPC 300 Watt Digital Quartz Glass Heater Finnex HPC 300 Watt Digital Quartz Glass Heater

    Finnex

    Finnex HPC 300 Watt Digital Quartz Glass Heater

    Finnex HPC 300 Watt Digital Quartz Glass Heater The HPC heater series is a glass heater that uses an advanced digital processor that monitors and controls the water temperature in your aquarium. The heating controller receives temperature data from the...

    $34.99
  • Sicce JOLLY PRESET 25 - Submersible Heater - 25 watt Sicce JOLLY PRESET 25 - Submersible Heater - 25 watt Sicce JOLLY PRESET 25 - Submersible Heater - 25 watt Sicce JOLLY PRESET 25 - Submersible Heater - 25 watt Sicce JOLLY PRESET 25 - Submersible Heater - 25 watt

    Sicce

    Sicce JOLLY PRESET 25 - Submersible Heater - 25 watt

    Sicce JOLLY PRESET 25 - Submersible Heater - 25 watt Jolly Preset Heaters have an Auto Shut Off feature that automatically turns the heater off when the temperature is reached. JOLLY plastic heaters are designed for small freshwater, marine, and...

    $34.99
  • PinPoint Calibration Thermometer

    Pinpoint - American Marine

    PinPoint Calibration Thermometer

    PinPoint Calibration Thermometer American Marine Inc. is proud to introduce the PINPOINT®Calibration Thermometer, the only truly accurate and affordable digital thermometer system with a large range calibration feature and a replaceable probe...

    $34.95
  • Fluval P50 - 50W Submersible Aquarium Heater Fluval P50 - 50W Submersible Aquarium Heater Fluval P50 - 50W Submersible Aquarium Heater

    Fluval

    Fluval P50 - 50W Submersible Aquarium Heater

    Fluval P50 - 50W Submersible Aquarium Heater P Series heaters are pre-set to maintain a consistent temperature of 24-26° C (76-78° F) in both fresh and saltwater nano aquariums. Strong shatterproof polymer construction protect tank and inhabitants...

    $33.99
  • Oase Heat-Up 50W Adjustable Heater Oase Heat-Up 50W Adjustable Heater

    OASE

    Oase Heat-Up 50W Adjustable Heater

    Oase HeatUp 50 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 –...

    $33.99
  • Finnex HMAS 150 Watts Titanium Heater with Guard Finnex HMAS 150 Watts Titanium Heater with Guard

    Finnex

    Finnex HMAS 150 Watts Titanium Heater with Guard

    Finnex HMAS 150 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...

    $32.99
  • Sicce JOLLY PRESET 12 - Submersible Heater - 12 watt Sicce JOLLY PRESET 12 - Submersible Heater - 12 watt Sicce JOLLY PRESET 12 - Submersible Heater - 12 watt Sicce JOLLY PRESET 12 - Submersible Heater - 12 watt Sicce JOLLY PRESET 12 - Submersible Heater - 12 watt

    Sicce

    Sicce JOLLY PRESET 12 - Submersible Heater - 12 watt

    Sicce JOLLY PRESET 12 - Submersible Heater - 12 watt Jolly Preset Heaters have an Auto Shut Off feature that automatically turns the heater off when the temperature is reached. JOLLY plastic heaters are designed for small freshwater, marine, and...

    $32.99
  • Pinpoint Wireless Digital Thermometer

    Pinpoint - American Marine

    Pinpoint Wireless Digital Thermometer

    Pinpoint Wireless Digital Thermometer Utilizing a radio wave signal, the remote sensor(s) will measure the temperature at the waterproof probe tip and send the information to the PINPOINT Temperature Display Monitor, which will display the temperature...

    Was: $37.95
    Now: $32.26
  • Fluval P25 - 25W Submersible Aquarium Heater Fluval P25 - 25W Submersible Aquarium Heater Fluval P25 - 25W Submersible Aquarium Heater

    Fluval

    Fluval P25 - 25W Submersible Aquarium Heater

    Fluval P25 - 25W Submersible Aquarium Heater Strong shatterproof polymer construction protect tank and inhabitants from damage Preset temperate requires no adjustment Waterproof, fully submersible design allows easy positioning inside aquarium LED...

    $31.99
  • Lifegard LED Digital Thermometer

    Pentair Aquatics

    Lifegard LED Digital Thermometer

    Lifegard LED Digital ThermometerLifegard Aquatics continues their breakthrough technology with the development of the industry's first submersible LED Digital Thermometer. This highly visible, ultra-bright blue LED display can be seen from across any...

    $30.88
  • Fluval P10 - 10W Submersible Aquarium Heater Fluval P10 - 10W Submersible Aquarium Heater Fluval P10 - 10W Submersible Aquarium Heater Fluval P10 - 10W Submersible Aquarium Heater Fluval P10 - 10W Submersible Aquarium Heater

    Fluval

    Fluval P10 - 10W Submersible Aquarium Heater

    Fluval P10 - 10W Submersible Aquarium Heater Fluval P Series heaters are pre-set to maintain a consistent temperature of 76-78 degrees F (24-26 degrees C) in both fresh and saltwater nano aquariums.Features: The strong shatterproof polymer...

    $29.99
  • Hinged Feeding Lid - Innovative Marine Hinged Feeding Lid - Innovative Marine Hinged Feeding Lid - Innovative Marine

    Innovative Marine

    Hinged Feeding Lid - Innovative Marine

    Hinged Feeding Lid - Innovative Marine Used with Mesh Screen Aquarium Lid Only. Feed and gain access into your aquarium without having to remove the entire lid. The simple and sleek look of FlipFeed easily clips onto mesh screen lids and with a quick cut...

    $29.99
  • Sicce JOLLY PRESET 6 - Submersible Heater - 6 watt Sicce JOLLY PRESET 6 - Submersible Heater - 6 watt Sicce JOLLY PRESET 6 - Submersible Heater - 6 watt Sicce JOLLY PRESET 6 - Submersible Heater - 6 watt Sicce JOLLY PRESET 6 - Submersible Heater - 6 watt

    Sicce

    Sicce JOLLY PRESET 6 - Submersible Heater - 6 watt

    Sicce JOLLY PRESET 6 - Submersible Heater - 6 watt Jolly Preset Heaters have an Auto Shut Off feature that automatically turns the heater off when the temperature is reached. JOLLY plastic heaters are designed for small freshwater, marine, and turtles...

    $29.99
  •  JBJ Installation Kit for Nano/Mini Chillers  JBJ Installation Kit for Nano/Mini Chillers

    JBJ

    JBJ Installation Kit for Nano/Mini Chillers

    Installation Kit for Nano/Mini Arctica Chillers by JBJ. Chiller Installation made easy! Includes: * 2 - 1/2" - 6ft flexible tubing * 1 - S-Tube - Outlet * 1 - U-Tube - InletInstallation Kit for Nano/Mini Arctica Chillers by JBJ. Chiller Installation...

    $29.95