Temperature Control

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Each species of fish has specific needs when it comes to temperature. For fish keepers, getting the right aquarium temperature is a breeze when you use one of these reliable temperature control products from Big Al’s Pets. Each one is designed to take the guesswork out of temperature regulation in your aquarium. You’ll be able to quickly and easily create settings for how warm or cool your fishes’ water needs to be. We carry the latest precision devices to provide you with more control over your aquarium water temperature while also helping to maintain optimal living conditions for your fish.

Our selection of aquarium temperature control products includes a number of devices that any fish keeper may need for their aquarium. Our thermometers provide you with accurate readings, while our heaters and chillers make sure that your water temperature is maintained with accuracy and stability. We also carry helpful accessories for setting up your aquarium temperature control devices, including magnetic suction cups and brackets. At Big Al’s Pets, you can get everything you need for your aquarium with a convenient, one-stop shopping experience.
  • Marina Suction Cups for Thermometers/Airline Tubing - Small - 2 pk
    Marina Small Thermometer Suction Cups can be used for securing thermometers and airline tubing within your aquarium environment.

    Regular Price: USD 0.99

    Sale Price USD 0.79

    Regular Price: USD 0.99

    Sale Price USD 0.79

  • Marina Suction Cups for Heaters (up to 3/4" dia.) - 2 pk
    Marina Suction Cups are designed to hold heaters measuring up to 3/4" in diameter. Powerful, long-lasting suction keeps your heater securely in place.

    Regular Price: USD 0.99

    Sale Price USD 0.79

    Regular Price: USD 0.99

    Sale Price USD 0.79

  • Hagen Heater Holder/Hose Bracket
    Plastic Heater Holder for Thermal Compact / Thermal Pre-set. Also for Fluval 104 and 204

    Regular Price: USD 2.99

    Sale Price USD 2.49

    Regular Price: USD 2.99

    Sale Price USD 2.49

  • Coralife Aquarium Chiller - 1/10 HP
    • Provides accurate temperature control with quality construction
    • Keeps water within +/- 2 degrees F of set temperature
    • Titanium heat exchanger will not corrode over time
    • Easy to use, programmable LED display
    • Includes 1 year limited manufacturer's warranty

    Regular Price: USD 459.99

    Sale Price USD 399.99

    Regular Price: USD 459.99

    Sale Price USD 399.99

  • Coralife Aquarium Chiller - 1/2 HP
    • Provides accurate temperature control with quality construction
    • Keeps water within +/- 2 degrees F of set temperature
    • Titanium heat exchanger will not corrode over time
    • Easy to use, programmable LED display
    • Includes 1 year limited manufacturer's warranty

    Regular Price: USD 1,059.99

    Sale Price USD 949.99

    Regular Price: USD 1,059.99

    Sale Price USD 949.99

  • Coralife Aquarium Chiller - 1 HP
    • Provides accurate temperature control with quality construction
    • Keeps water within +/- 2 degrees F of set temperature
    • Titanium heat exchanger will not corrode over time
    • Easy to use, programmable LED display
    • Includes 1 year limited manufacturer's warranty

    Regular Price: USD 1,389.99

    Sale Price USD 1,199.99

    Regular Price: USD 1,389.99

    Sale Price USD 1,199.99

  • Tetra Submersible Heater - HT-55 - 200 W
    • Submersible glass heater for aquariums 40 to 55 gallons in size
    • Electronic thermostat maintains a constant 78±2° F (25±1° C)
    • LED indicator enables visual confirmation of heater operation
    • Convenient suction cup mount makes installation a breeze
    • Features a heat and shock-resistant borosilicate glass housing

    Regular Price: USD 24.99

    Sale Price USD 17.99

    Regular Price: USD 24.99

    Sale Price USD 17.99

  • Tetra Submersible Heater - HT-30 - 100 W
    • Submersible glass heater for aquariums 10 to 30 gallons in size
    • Electronic thermostat maintains a constant 78±2° F (25±1° C)
    • LED indicator enables visual confirmation of heater operation
    • Convenient suction cup mount makes installation a breeze
    • Features a heat and shock-resistant borosilicate glass housing

    Regular Price: USD 15.99

    Sale Price USD 12.99

    Regular Price: USD 15.99

    Sale Price USD 12.99

  • Tetra Submersible Heater - HT-10 - 50 W
    • Submersible glass heater for aquariums 2 to 10 gallons in size
    • Electronic thermostat maintains a constant 78±2° F (25±1° C)
    • LED indicator enables visual confirmation of heater operation
    • Convenient suction cup mount makes installation a breeze
    • Features a heat and shock-resistant borosilicate glass housing

    Regular Price: USD 12.99

    Sale Price USD 8.99

    Regular Price: USD 12.99

    Sale Price USD 8.99

  • Lee's Heater Holders - 2 pk
    The Heater Holder features a clip with a suction cup that is to be used to secure 1" heater tubing to the wall of the aquarium. The Heater Holder can also be used to secure 1" siphon or uplift tubes.

    Regular Price: USD 1.19

    Sale Price USD 1.07

    Regular Price: USD 1.19

    Sale Price USD 1.07

  • Tom Aquatics Temp Alert Digital Thermometer - Fahrenheit
    The Tom Aquarium Temp Alert Thermometers display both aquarium water temperature and room temperature simultaneously. They features 4 programmable alerts, with both audible and LED alarms. Suitable for both freshwater and saltwater applications.

    Regular Price: USD 16.99

    Sale Price USD 15.99

    Regular Price: USD 16.99

    Sale Price USD 15.99

  • Marineland Precision Submersible Heater - 50 W
    • Powerful submersible heater for aquariums up to 12 gallons
    • Equally capable in both freshwater and saltwater aquariums
    • Advanced heating element provides even heat distribution
    • Thermal safety switch automatically prevents heater failure
    • cUL Listed and backed by a class-leading lifetime warranty!

    Regular Price: USD 21.99

    Sale Price USD 18.99

    Regular Price: USD 21.99

    Sale Price USD 18.99

  • Marineland Precision Submersible Heater - 100 W
    • Powerful submersible heater for aquariums up to 29 gallons
    • Equally capable in both freshwater and saltwater aquariums
    • Advanced heating element provides even heat distribution
    • Thermal safety switch automatically prevents heater failure
    • cUL Listed and backed by a class-leading lifetime warranty!

    Regular Price: USD 23.99

    Sale Price USD 17.99

    Regular Price: USD 23.99

    Sale Price USD 17.99

  • Marineland Precision Submersible Heater - 150 W
    • Powerful submersible heater for aquariums up to 40 gallons
    • Equally capable in both freshwater and saltwater aquariums
    • Advanced heating element provides even heat distribution
    • Thermal safety switch automatically prevents heater failure
    • cUL Listed and backed by a class-leading lifetime warranty!

    Regular Price: USD 24.99

    Sale Price USD 19.99

    Regular Price: USD 24.99

    Sale Price USD 19.99

  • Marineland Precision Submersible Heater - 200 W
    • Powerful submersible heater for aquariums up to 55 gallons
    • Equally capable in both freshwater and saltwater aquariums
    • Advanced heating element provides even heat distribution
    • Thermal safety switch automatically prevents heater failure
    • cUL Listed and backed by a class-leading lifetime warranty!

    Regular Price: USD 25.99

    Sale Price USD 21.99

    Regular Price: USD 25.99

    Sale Price USD 21.99

  • Marineland Precision Submersible Heater - 250 W
    • Powerful submersible heater for aquariums up to 70 gallons
    • Equally capable in both freshwater and saltwater aquariums
    • Advanced heating element provides even heat distribution
    • Thermal safety switch automatically prevents heater failure
    • cUL Listed and backed by a class-leading lifetime warranty!

    Regular Price: USD 26.99

    Sale Price USD 21.99

    Regular Price: USD 26.99

    Sale Price USD 21.99

  • Marineland Precision Submersible Heater - 300 W
    • Powerful submersible heater for aquariums up to 80 gallons
    • Equally capable in both freshwater and saltwater aquariums
    • Advanced heating element provides even heat distribution
    • Thermal safety switch automatically prevents heater failure
    • cUL Listed and backed by a class-leading lifetime warranty!

    Regular Price: USD 28.99

    Sale Price USD 24.99

    Regular Price: USD 28.99

    Sale Price USD 24.99

  • Marineland Precision Submersible Heater - 400 W
    • Powerful submersible heater for aquariums up to 125 gallons
    • Equally capable in both freshwater and saltwater aquariums
    • Advanced heating element provides even heat distribution
    • Thermal safety switch automatically prevents heater failure
    • cUL Listed and backed by a class-leading lifetime warranty!

    Regular Price: USD 46.99

    Sale Price USD 39.99

    Regular Price: USD 46.99

    Sale Price USD 39.99

  • Underwater Treasures Floating Glass Thermometer
    Floating Glass Thermometer is accurate and easy to read. It displays temperature in both °C and °F, and is great for freshwater and marine systems. This fully submersible thermometer can be secured with included suction cup or can float freely.

    Regular Price: USD 2.39

    Sale Price USD 1.59

    Regular Price: USD 2.39

    Sale Price USD 1.59

  • Zoo Med Mag-Clip Magnetic Suction Cups
    • Industrial strength magnetic suction cup system
    • Includes 6 assorted sizes of nylon clips
    • Ideal for holding heaters, airline tubing, spray bars, etc.
    • Never replace your suction cups again!

    Regular Price: USD 7.99

    Sale Price USD 6.49

    Regular Price: USD 7.99

    Sale Price USD 6.49

  • Zoo Med Aqua Cool Aquarium Cooling Fan
    • A very affordable alternative to expensive chillers
    • Dissipates radiant heat generated by aquarium lamps
    • Reduces water temperature through evaporative cooling
    • Features a wide, multi-directional discharge nozzle
    • Includes low voltage, energy efficient power source

    Regular Price: USD 24.99

    Sale Price USD 19.99

    Regular Price: USD 24.99

    Sale Price USD 19.99

  • Aqueon Submersible Aquarium Heater - 50 W
    Aqueon Submersible Heaters are accurate, reliable, durable and easy to use. Each unit is calibrated twice to ensure accuracy within +/- 1degrees F. Made from thermal shatter-resistant glass designed to absorb impacts.

    Regular Price: USD 24.99

    Sale Price USD 18.99

    Regular Price: USD 24.99

    Sale Price USD 18.99

  • Aqueon Submersible Aquarium Heater - 100 W
    Aqueon Submersible Heaters are accurate, reliable, durable and easy to use. Each unit is calibrated twice to ensure accuracy within +/- 1degrees F. Made from thermal shatter-resistant glass designed to absorb impacts.

    Regular Price: USD 27.99

    Sale Price USD 18.99

    Regular Price: USD 27.99

    Sale Price USD 18.99

  • Aqueon Submersible Aquarium Heater - 200 W
    Aqueon Submersible Heaters are accurate, reliable, durable and easy to use. Each unit is calibrated twice to ensure accuracy within +/- 1degrees F. Made from thermal shatter-resistant glass designed to absorb impacts.

    Regular Price: USD 29.99

    Sale Price USD 19.99

    Regular Price: USD 29.99

    Sale Price USD 19.99

  • Aqueon Submersible Aquarium Heater - 300 W
    Aqueon Submersible Heaters are accurate, reliable, durable and easy to use. Each unit is calibrated twice to ensure accuracy within +/- 1degrees F. Made from thermal shatter-resistant glass designed to absorb impacts.

    Regular Price: USD 31.99

    Sale Price USD 24.99

    Regular Price: USD 31.99

    Sale Price USD 24.99

  • Cobalt Aquatics Neo-Therm Heater - 25 W
    • Modern, super flat design
    • Easy to set "one touch" system
    • Accurate electronic thermostat (±0.5 degrees F)
    • LEDs display set and actual temperature
    • Shatterproof outer casing protects electrical components
    USD 56.99
    USD 56.99
  • Cobalt Aquatics Neo-Therm Heater - 50 W
    • Modern, super flat design
    • Easy to set "one touch" system
    • Accurate electronic thermostat (±0.5 degrees F)
    • LEDs display set and actual temperature
    • Shatterproof outer casing protects electrical components
    USD 57.99
    USD 57.99
  • Cobalt Aquatics Neo-Therm Heater - 75 W
    • Modern, super flat design
    • Easy to set "one touch" system
    • Accurate electronic thermostat (±0.5 degrees F)
    • LEDs display set and actual temperature
    • Shatterproof outer casing protects electrical components
    USD 60.99
    USD 60.99
  • Cobalt Aquatics Neo-Therm Heater - 100 W
    • Modern, super flat design
    • Easy to set "one touch" system
    • Accurate electronic thermostat (±0.5 degrees F)
    • LEDs display set and actual temperature
    • Shatterproof outer casing protects electrical components
    USD 62.99
    USD 62.99
  • Cobalt Aquatics Neo-Therm Heater - 150 W
    • Modern, super flat design
    • Easy to set "one touch" system
    • Accurate electronic thermostat (±0.5 degrees F)
    • LEDs display set and actual temperature
    • Shatterproof outer casing protects electrical components
    USD 72.99
    USD 72.99
  • Cobalt Aquatics Accu-Therm Heater - 25 W
    • Advanced, fully submersible heater
    • Equally capable in freshwater and saltwater environments
    • Computer-tested accurate to ± 2 ° Fahrenheit
    • Features an easily calibrated thermostat and Triac circuit
    • Ceramic radiator delivers even heat distribution
    USD 25.99
    USD 25.99
  • Cobalt Aquatics Accu-Therm Heater - 50 W
    • Advanced, fully submersible heater
    • Equally capable in freshwater and saltwater environments
    • Computer-tested accurate to ± 2 ° Fahrenheit
    • Features an easily calibrated thermostat and Triac circuit
    • Ceramic radiator delivers even heat distribution
    USD 26.99
    USD 26.99
  • Cobalt Aquatics Accu-Therm Heater - 75 W
    • Advanced, fully submersible heater
    • Equally capable in freshwater and saltwater environments
    • Computer-tested accurate to ± 2 ° Fahrenheit
    • Features an easily calibrated thermostat and Triac circuit
    • Ceramic radiator delivers even heat distribution
    USD 27.99
    USD 27.99
  • Cobalt Aquatics Accu-Therm Heater - 100 W
    • Advanced, fully submersible heater
    • Equally capable in freshwater and saltwater environments
    • Computer-tested accurate to ± 2 ° Fahrenheit
    • Features an easily calibrated thermostat and Triac circuit
    • Ceramic radiator delivers even heat distribution
    USD 28.99
    USD 28.99
  • Cobalt Aquatics Accu-Therm Heater - 150 W
    • Advanced, fully submersible heater
    • Equally capable in freshwater and saltwater environments
    • Computer-tested accurate to ± 2 ° Fahrenheit
    • Features an easily calibrated thermostat and Triac circuit
    • Ceramic radiator delivers even heat distribution
    USD 30.99
    USD 30.99
  • Cobalt Aquatics Accu-Therm Heater - 200 W
    • Advanced, fully submersible heater
    • Equally capable in freshwater and saltwater environments
    • Computer-tested accurate to ± 2 ° Fahrenheit
    • Features an easily calibrated thermostat and Triac circuit
    • Ceramic radiator delivers even heat distribution
    USD 31.99
    USD 31.99
  • Cobalt Aquatics Accu-Therm Heater - 250 W
    • Advanced, fully submersible heater
    • Equally capable in freshwater and saltwater environments
    • Computer-tested accurate to ± 2 ° Fahrenheit
    • Features an easily calibrated thermostat and Triac circuit
    • Ceramic radiator delivers even heat distribution
    USD 33.99
    USD 33.99
  • Cobalt Aquatics Mini-Therm Heater - 10 W
    • Compact, fully submersible heater for small aquariums
    • Equally capable in freshwater and saltwater environments
    • Constant operation eliminates the need for adjustments
    • Ceramic radiator delivers even heat distribution
    • Shatterproof polymer casing protects aquarium and heater
    USD 14.99
    USD 14.99
  • Cobalt Aquatics Mini-Therm Heater - 20 W
    • Compact, fully submersible heater for small aquariums
    • Equally capable in freshwater and saltwater environments
    • Constant operation eliminates the need for adjustments
    • Ceramic radiator delivers even heat distribution
    • Shatterproof polymer casing protects aquarium and heater
    USD 21.99
    USD 21.99
  • Marineland VisiTherm Deluxe Heater Mounting Bracket
    • Perfect for VisiTherm submersible aquarium heaters
    • Quickly attaches your heater to the aquarium glass
    • Easy-to-use mounting bracket keeps heaters secure
    • Suitable for use with any model of VisiTherm Heater
    USD 4.99
    USD 4.99
  • Underwater Treasures Easy Read Thermometer
    This battery operated thermometer is compact and fully submersible. It provides constant, accurate readings to +/- 1 degree Fahrenheit, and has a solid plastic casing to help prevent breakage.

    Regular Price: USD 6.89

    Sale Price USD 4.99

    Regular Price: USD 6.89

    Sale Price USD 4.99

  • Underwater Treasures Digital Thermometer
    Accurate and easy-to-read, with a reading range of 18-34°C (displays temperature in both °C and °F). It features a green indicator that displays the current temperature. Great for both freshwater and saltwater applications.

    Regular Price: USD 2.49

    Sale Price USD 1.49

    Regular Price: USD 2.49

    Sale Price USD 1.49

  • Tetra Submersible Heater - HT-40 - 150 W
    • Submersible glass heater for aquariums 30 to 40 gallons in size
    • Electronic thermostat maintains a constant 78±2° F (25±1° C)
    • LED indicator enables visual confirmation of heater operation
    • Convenient suction cup mount makes installation a breeze
    • Features a heat and shock-resistant borosilicate glass housing

    Regular Price: USD 22.99

    Sale Price USD 16.99

    Regular Price: USD 22.99

    Sale Price USD 16.99

  • Eheim Jager Heater Double Suction Holder
    Replacement Heater Holder for all Eheim Jager Heaters, complete with rubber suction cups. The heater holder holds the heater away from the aquarium glass allowing for water circulation over the entire unit.

    Regular Price: USD 5.49

    Sale Price USD 3.49

    Regular Price: USD 5.49

    Sale Price USD 3.49

  • Penn Plax Standing Thermometer
    • Penn Plax offers a variety of different styles of Aquarium Thermometers. Aquarium Thermometers are an important component for every aquarium set-up. The provide clear, accurate live temperature readings of your aquarium water's temperature, allowing the aquarium hobbyist to fine tune their heating system to provide the appropriate water temperature for their fish. Economical sinking Thermometer.

    Regular Price: USD 1.99

    Sale Price USD 1.79

    Regular Price: USD 1.99

    Sale Price USD 1.79

  • Hydor Slim Heater for Micro Tanks & Mini Aquariums - 7.5 W
    • For aquariums with fish similar to Bettas or Guppies
    • Used on glass or acrylic miniature aquariums
    • Suitable to use in a 2 or 5 gallon aquarium

    Regular Price: USD 12.99

    Sale Price USD 8.99

    Regular Price: USD 12.99

    Sale Price USD 8.99

  • Hydor ETH 200 In-Line Heater - 1/2" - 200 W
    The self-limiting PTC heating element guarantees maximum safety against any risk of overheating. The exclusive technology and the high quality of the components guarantee a long lasting product.

    Regular Price: USD 57.99

    Sale Price USD 52.99

    Regular Price: USD 57.99

    Sale Price USD 52.99

  • Hydor ETH 201 In-Line Heater - 5/8" - 200 W
    The self-limiting PTC heating element guarantees maximum safety against any risk of overheating. The exclusive technology and the high quality of the components guarantee a long lasting product.
    USD 49.99
    USD 49.99
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