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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.

  • Finnex HC810M/TH800S Controller / 800W Heater Combo Finnex HC810M/TH800S Controller / 800W Heater Combo Finnex HC810M/TH800S Controller / 800W Heater Combo

    Finnex

    Finnex HC810M/TH800S Controller / 800W Heater Combo

    Finnex HC810M/TH800S Controller / Heater ComboFinnex THS-300 - 800 Watts Titanium Heating Element with Guard The new TH-S Series features the same quality built titanium elements, differentiating itself by being engulfed in a highly protective heater...

    $119.98
  • IM AUQA Gadget - Helio Heater - 50 Watt IM AUQA Gadget - Helio Heater - 50 Watt IM AUQA Gadget - Helio Heater - 50 Watt IM AUQA Gadget - Helio Heater - 50 Watt IM AUQA Gadget - Helio Heater - 50 Watt

    Innovative Marine

    IM AUQA Gadget - Helio Heater - 50 Watt

    IM AUQA Gadget - Helio Heater - 50 Watt Aquarium Size: Up to 20 Gallons*Based on +10°F water temperature increase from current ambient temperature.Heating Element Dims: L 4" x D .80"Remote Sensor Dims: L 2.3" x D .31" Helio Smart...

    $119.00
  • Finnex STE-600 Titanium Heater with Controller Finnex STE-600 Titanium Heater with Controller Finnex STE-600 Titanium Heater with Controller Finnex STE-600 Titanium Heater with Controller Finnex STE-600 Titanium Heater with Controller

    Finnex

    Finnex STE-600 Titanium Heater with Controller

    Finnex STE-600 Titanium Heater with Controller STE Titanium Heater Series   Safety: Redundancy circuit technology, non-resumable fuse, safety guard Titanium Heating Element: Virtually unbreakable, corrosion resistant Controller:  Smart 68-92 deg F,...

    $118.99
  • AquaEL In-Line Flow Heater 300 Watt AquaEL In-Line Flow Heater 300 Watt AquaEL In-Line Flow Heater 300 Watt

    AquaEl

    AquaEL In-Line Flow Heater 300 Watt

    AquaEL In-Line Flow Heater 300 Watt Smart Heating System (SHS) in which the heater has been equipped is a technology of intelligent power selection. It consists in adjusting the power of water heating to different sizes of the aquarium and the...

    $114.99
  • Finnex HC810M/TH500S Controller / 500W Heater Combo Finnex HC810M/TH500S Controller / 500W Heater Combo Finnex HC810M/TH500S Controller / 500W Heater Combo

    Finnex

    Finnex HC810M/TH500S Controller / 500W Heater Combo

    Finnex HC810M/TH500S Controller / Heater ComboFinnex THS-300 - 800 Watts Titanium Heating Element with Guard The new TH-S Series features the same quality built titanium elements, differentiating itself by being engulfed in a highly protective heater...

    $109.98
  • Finnex STE-400 Titanium Heater with Controller Finnex STE-400 Titanium Heater with Controller Finnex STE-400 Titanium Heater with Controller Finnex STE-400 Titanium Heater with Controller Finnex STE-400 Titanium Heater with Controller

    Finnex

    Finnex STE-400 Titanium Heater with Controller

    Finnex STE-400 Titanium Heater with Controller STE Titanium Heater Series   Safety: Redundancy circuit technology, non-resumable fuse, safety guard Titanium Heating Element: Virtually unbreakable, corrosion resistant Controller:  Smart 68-92 deg F,...

    $106.99
  • IM AUQA Gadget - Helio Heater - 350 Watt Element IM AUQA Gadget - Helio Heater - 350 Watt Element

    Innovative Marine

    IM AUQA Gadget - Helio Heater - 350 Watt Element

    IM AUQA Gadget - Helio Heater - 350 Watt Element *Helio PTC Heating Element/s are only compatible with the Helio PTC Smart Controller (Controller sku# 830001). *Helio PTC Heating Element/s will NOT work with Helio Universal Heater Controller (Controller...

    $106.00
  • Finnex HC810M/TH300S Controller / 300W Heater Combo Finnex HC810M/TH300S Controller / 300W Heater Combo Finnex HC810M/TH300S Controller / 300W Heater Combo

    Finnex

    Finnex HC810M/TH300S Controller / 300W Heater Combo

    Finnex HC810M/TH300S Controller / Heater ComboFinnex THS-300 - 800 Watts Titanium Heating Element with Guard The new TH-S Series features the same quality built titanium elements, differentiating itself by being engulfed in a highly protective heater...

    $104.98
  • Cobalt Neo-Therm Pro 100W Aquarium Heater Cobalt Neo-Therm Pro 100W Aquarium Heater

    Cobalt Aquatics

    Cobalt Neo-Therm Pro 100W Aquarium Heater

    Cobalt Neo-Therm Pro 100W Aquarium Heater The Cobalt Aquatics Neo-Therm Pro fully submersible electronic heaters feature innovative circuitry that constantly varies the power consumption of the heater depending on current tank conditions to maximize...

    $102.97
  • Tunze Aquawind Eco Chic Fan Tunze Aquawind Eco Chic Fan Tunze Aquawind Eco Chic Fan Tunze Aquawind Eco Chic Fan

    Tunze

    Tunze Aquawind Eco Chic Fan

    Tunze Aquawind Eco Chic The TUNZE® Aquawind eco-chic 7028.500 is a very low-noise aquarium ventilator provided with 12 V safety low voltage and it is easy to install on the edge of aquariums with a glass thickness of 0 up to 22 mm (0” - 0.866”). The...

    Was: $119.99
    Now: $101.99
  • Teco 400w Heater Kit Teco 400w Heater Kit

    TECO us

    Teco 400w Heater Kit

    Teco 400w Heater Kit Compatibility: TK-3000, TK-6000 he 400w heater kit is designed to work universally with all Teco SeaChill Aquarium Chillers. Installation is easy and takes less than 10 minutes. No tools required. Includes an installation guide...

    $100.00
  • IM AUQA Gadget - Helio Heater - Universal Controller IM AUQA Gadget - Helio Heater - Universal Controller IM AUQA Gadget - Helio Heater - Universal Controller IM AUQA Gadget - Helio Heater - Universal Controller

    Innovative Marine

    IM AUQA Gadget - Helio Heater - Universal Controller

    IM AUQA Gadget - Helio Heater - Universal Controller *Does not include heating elements * Requires 2/3 Prong heating elements * Willl NOT work with Helio PTC smart elements Accommodates a combined total of 1000 Watts Remote Sensor Dims: L 2.3" x D ...

    $96.00
  • Finnex STE-200 Titanium Heater with Controller Finnex STE-200 Titanium Heater with Controller Finnex STE-200 Titanium Heater with Controller Finnex STE-200 Titanium Heater with Controller Finnex STE-200 Titanium Heater with Controller

    Finnex

    Finnex STE-200 Titanium Heater with Controller

    Finnex STE-200 Titanium Heater with Controller STE Titanium Heater Series   Safety: Redundancy circuit technology, non-resumable fuse, safety guard Titanium Heating Element: Virtually unbreakable, corrosion resistant Controller:  Smart 68-92 deg F,...

    $94.99
  • Cobalt Neo-Therm Pro 50W Aquarium Heater Cobalt Neo-Therm Pro 50W Aquarium Heater

    Cobalt Aquatics

    Cobalt Neo-Therm Pro 50W Aquarium Heater

    Cobalt Neo-Therm Pro 50W Aquarium Heater The Cobalt Aquatics Neo-Therm Pro fully submersible electronic heaters feature innovative circuitry that constantly varies the power consumption of the heater depending on current tank conditions to maximize...

    $93.97
  • IM AUQA Gadget - Helio Heater - 200 Watt Element IM AUQA Gadget - Helio Heater - 200 Watt Element

    Innovative Marine

    IM AUQA Gadget - Helio Heater - 200 Watt Element

    IM AUQA Gadget - Helio Heater - 200 Watt Element *Helio PTC Heating Element/s are only compatible with the Helio PTC Smart Controller (Controller sku# 830001). *Helio PTC Heating Element/s will NOT work with Helio Universal Heater Controller (Controller...

    $93.00
  • Lifegard Heater Module Double Capacity 24.75" Lifegard Heater Module Double Capacity 24.75"

    Lifegard

    Lifegard Heater Module Double Capacity 24.75"

    Lifegard Heater Module Double Capacity 24.75" Heater Module Provides the most stable temperature possible by recirculating aquarium water continuously around heater element. Large Heater Element Chamber Single capacity holds heater 12″ in length...

    $89.99
  • IM AUQA Gadget - (2) Helio Element Magnetic Holder IM AUQA Gadget - (2) Helio Element Magnetic Holder

    Innovative Marine

    IM AUQA Gadget - (2) Helio Element Magnetic Holder

    IM AUQA Gadget - (2) 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...

    $84.00
  • IM AUQA Gadget - Helio Heater - 100 Watt Element IM AUQA Gadget - Helio Heater - 100 Watt Element

    Innovative Marine

    IM AUQA Gadget - Helio Heater - 100 Watt Element

    IM AUQA Gadget - Helio Heater - 100 Watt Element *Helio PTC Heating Element/s are only compatible with the Helio PTC Smart Controller (Controller sku# 830001). *Helio PTC Heating Element/s will NOT work with Helio Universal Heater Controller (Controller...

    $80.00
  • AquaEl ULTRA Heater 200 Watt AquaEl ULTRA Heater 200 Watt

    AquaEl

    AquaEl ULTRA Heater 200 Watt

    AquaEl ULTRA Heater 200 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...

    $79.99
  • Lifegard Individual Heater Module 15" Lifegard Individual Heater Module 15"

    Lifegard

    Lifegard Individual Heater Module 15"

    Lifegard Individual Heater Module 15" Heater Module Provides the most stable temperature possible by recirculating aquarium water continuously around heater element. Large Heater Element Chamber Single capacity holds heater 12″ in length. Double...

    $79.99
  • AquaEl ULTRA Heater 150 Watt AquaEl ULTRA Heater 150 Watt

    AquaEl

    AquaEl ULTRA Heater 150 Watt

    AquaEl ULTRA Heater 150 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...

    $74.99
  • Eheim Thermocontrol+ e Heater 300 Watt - WiFi Eheim Thermocontrol+ e Heater 300 Watt - WiFi Eheim Thermocontrol+ e Heater 300 Watt - WiFi Eheim Thermocontrol+ e Heater 300 Watt - WiFi Eheim Thermocontrol+ e Heater 300 Watt - WiFi

    Eheim

    Eheim Thermocontrol+ e Heater 300 Watt - WiFi

    Eheim Thermocontrol+ e Heater 300 Watt - WiFi With EHEIM thermocontrol+ e, we offer you the aquarium heater of the future. Intelligent and ingeniously designed.EHEIM thermocontrol+ e is our first adjustable heater with digital control via WLAN. You can...

    $74.99
  • Finnex HMK-500 Titanium Aquarium Heater - 500 watt Finnex HMK-500 Titanium Aquarium Heater - 500 watt Finnex HMK-500 Titanium Aquarium Heater - 500 watt

    Finnex

    Finnex HMK-500 Titanium Aquarium Heater - 500 watt

    Finnex HMK Titanium Aquarium Heater - 500 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...

    $72.99
  • Eheim Thermocontrol+ e Heater 250 Watt - WiFi Eheim Thermocontrol+ e Heater 250 Watt - WiFi Eheim Thermocontrol+ e Heater 250 Watt - WiFi Eheim Thermocontrol+ e Heater 250 Watt - WiFi Eheim Thermocontrol+ e Heater 250 Watt - WiFi

    Eheim

    Eheim Thermocontrol+ e Heater 250 Watt - WiFi

    Eheim Thermocontrol+ e Heater 250 Watt - WiFi With EHEIM thermocontrol+ e, we offer you the aquarium heater of the future. Intelligent and ingeniously designed.EHEIM thermocontrol+ e is our first adjustable heater with digital control via WLAN. You can...

    $70.99
  • 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...

    $69.99
  • Bubble Magus 6 Cooling Fan Bubble Magus 6 Cooling Fan

    Bubble Magus

    Bubble Magus 6 Cooling Fan

    Bubble Magus 6 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...

    $69.95
  • Finnex HMK-300 Titanium Aquarium Heater - 300 watt Finnex HMK-300 Titanium Aquarium Heater - 300 watt Finnex HMK-300 Titanium Aquarium Heater - 300 watt

    Finnex

    Finnex HMK-300 Titanium Aquarium Heater - 300 watt

    Finnex HMK Titanium Aquarium Heater - 300 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...

    $68.99
  • Teco UV Sterilizer Replacement Bulb, 14W Teco UV Sterilizer Replacement Bulb, 14W

    TECO us

    Teco UV Sterilizer Replacement Bulb, 14W

    Teco UV Sterilizer Replacement Bulb, 14W Replacement bulb for the UV Sterilizer kit on TECO SeaChill aquarium chillers.Teco UV Sterilizer Replacement Bulb, 14W Replacement bulb for the UV Sterilizer kit on TECO SeaChill aquarium chillers. Product...

    $68.00
  • AquaEl ULTRA Heater 100 Watt AquaEl ULTRA Heater 100 Watt

    AquaEl

    AquaEl ULTRA Heater 100 Watt

    AquaEl ULTRA Heater 100 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...

    $64.99
  • Finnex HMH 500 Watt Digital Heater Finnex HMH 500 Watt Digital Heater

    Finnex

    Finnex HMH 500 Watt Digital Heater

    Finnex HMH 500 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...

    $64.99
  • Finnex HMS 500 Watt Digital Heater Finnex HMS 500 Watt Digital Heater

    Finnex

    Finnex HMS 500 Watt Digital Heater

    Finnex HMS 500 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...

    $64.99
  • Finnex HMK-200 Titanium Aquarium Heater - 200 watt Finnex HMK-200 Titanium Aquarium Heater - 200 watt Finnex HMK-200 Titanium Aquarium Heater - 200 watt

    Finnex

    Finnex HMK-200 Titanium Aquarium Heater - 200 watt

    Finnex HMK Titanium Aquarium Heater - 200 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...

    $63.99
  • Eheim ThermoControl Heater E200 watt Eheim ThermoControl Heater E200 watt Eheim ThermoControl Heater E200 watt

    Eheim

    Eheim ThermoControl Heater E200 watt

    Eheim ThermoControl Heater E200 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...

    $63.49
  • Eheim ThermoControl Heater E250 watt Eheim ThermoControl Heater E250 watt Eheim ThermoControl Heater E250 watt

    Eheim

    Eheim ThermoControl Heater E250 watt

    Eheim ThermoControl Heater E250 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...

    $63.49
  • Eheim ThermoControl Heater E300 watt Eheim ThermoControl Heater E300 watt Eheim ThermoControl Heater E300 watt

    Eheim

    Eheim ThermoControl Heater E300 watt

    Eheim ThermoControl Heater E300 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...

    $63.49
  • 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
  • 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...

    $59.99
  • 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
  • IceCap Heater Controller IceCap Heater Controller

    IceCap

    IceCap Heater Controller

    IceCap Heater Controller Aquarium Heater Controller The IceCap heater controller can connect up to two heating elements (sold separately) and provides precise temperature control for an aquarium. It includes dual-heating power jacks and supports up to...

    $59.99
  • 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