Mylivell Aquarium Heater Submersible

Many of the freshwater and saltwater fish we keep are bred and not wild-caught, but they retain their native environmental needs. Many of these fish are tropical fish, which means in most home environments they will need an aquarium heater to keep the water temperature at a level that keeps them happy and healthy.

If you keep bettas, tetras, guppies, and even dwarf shrimp, they require a stable, warm water temperature.

If you’ve looked for an aquarium heater in your local fish store or online, you’ve probably been overwhelmed by the options. There are different sizes and shapes, different levels of adjustment, and even options for smart heaters.

Finding the right heater for your aquarium can be overwhelming, so here are reviews of the 10 best aquarium heaters to help you pick the best product to meet your aquarium’s needs.divider1- goldfish

A Quick Comparison of Our Favorites

Image Product Details
Best Overall
Winner
Aquatop Submersible Glass Aquarium Heater Aquatop Submersible Glass Aquarium Heater
  • Cost-effective
  • Available in 7 sizes
  • Suction cups are included
  • Best Value
    Second place
    Tetra HT10 Submersible Aquarium Heater Tetra HT10 Submersible Aquarium Heater
  • Can be used in tanks from 2-10 gallons
  • Can be installed vertically or horizontally
  • Preset temperature is only plus or minus 2°F
  • Premium Choice
    Third place
    Cobalt Aquatics Electronic Aquarium Heater Cobalt Aquatics Electronic Aquarium Heater
  • Shatterproof casing
  • Can be installed vertically or horizontally
  • One touch temperature adjustment from 66-96°F
  • Eheim Jager Thermostat Aquarium Heater Eheim Jager Thermostat Aquarium Heater
  • Adjustable from 65-93°F
  • Easy recalibration
  • Fully submersible
  • Marina Betta Submersible Aquarium Heater Marina Betta Submersible Aquarium Heater
  • Fully submersible
  • Good pick for nano tanks and bowls
  • Can be installed vertically or horizontally
  • The 10 Best Aquarium Heaters- Reviews 2021

    1. Aquatop Submersible Glass Aquarium Heater – Best Overall1Aquatop Submersible Glass Aquarium Heater

     

    The Aquatop Submersible Glass Aquarium Heater takes the spot as the best overall aquarium heater for its simple but functional design and fair price. This aquarium heater is available in 7 sizes from 50-300 watts.

    This heater is made from double insulated glass and is fully submersible. The insulation around the heating element will help protect your fish and invertebrates from injury if they touch the heater while it is running. For temperature control, all you have to do is turn the red knob on top of the unit. This heater can be adjusted from 68-93°F and has an indicator light below the temperature gauge that lets you know when the heater is actively working to heat the water. Suction cups are included to attach the heater to the interior of the tank.

    Even though this unit is fully submersible, the manufacturer recommends installing it with the temperature adjustment knob above the waterline. This heater can only be mounted vertically or angled but should not be mounted fully horizontally or on the bottom of the tank.

    Pros
    • Available in 7 sizes
    • Cost-effective
    • Double insulated glass protects against the heating element
    • Temperature adjustment knob is easy to use
    • Adjustable from 68-93°F
    • Indicator light lets you know when the unit is actively running
    • Suction cups are included
    Cons
    • Can only be mounted vertically

    2. Tetra HT10 Submersible Aquarium Heater – Best Value2Tetra HT10 Submersible Aquarium Heater & Electronic Thermostat

     

    The Tetra HT10 Submersible Aquarium Heater is the best aquarium heater for the money because it is functional but affordable. This heater is 50-watts and is not adjustable.

    This heater maintains the water temperature at a preset 78°F, plus or minus 2°F. It features an indicator light that shows up red when the heater is actively running and shows up green when the heater is on standby. This heater can be installed vertically or horizontally and is fully submersible. This heater only measures 8.25 inches tall, so it’s easy to hide behind plants, bubble walls, or aquarium décor. It is intended for tanks from 2-10 gallons.

    The suction cup included with this heater does not clip on and off, but instead it completely circles the heater. This means it’s more secure from being knocked loose but also more difficult to clean and maintenance. Since you cannot adjust the temperature of this heater, if it isn’t calibrated properly then you will need to closely monitor the water temperature.

    Pros
    • Best value
    • Can be used in tanks from 2-10 gallons
    • Preset temperature is only plus or minus 2°F
    • Indicator light shows when running and when in standby mode
    • Can be installed vertically or horizontally
    • Easy to hide behind plants and décor
    • Slide-on suction cup helps keep it from being knocked loose
    Cons
    • Temperature is not adjustable
    • Not appropriate for tanks over 10 gallons
    • Closely monitor the water temperature in case you receive a poorly calibrated unit


    3. Cobalt Aquatics Electronic Aquarium Heater – Premium Choice3Cobalt Aquatics Electronic Neo-Therm Submersible Aquarium Heater

     

    The premium choice for aquarium heaters is the Cobalt Aquatics Electronic Aquarium Heater because it’s functional and has a sleek design but also has a premium price. This heater is available in 5 sizes from 25-150 watts.

    This heater is fully submersible and is thin and flat, making it a good fit for tanks and even terrariums and vivariums. It can be set between 66-96°F and is accurate within a plus or minus 0.5°F range. It features an LED display that shows both the current tank temperature and the set temperature. It also features one-touch setup and temperature adjustment. It’s inside of a shatterproof casing that the manufacturer considers to be nearly indestructible. It has a built-in thermal protection circuit that provides an automatic heater shutdown to prevent overheating. This heater can be installed horizontally or vertically.

    For proper functionality, the adjustment dial and the lower portion of the heater must be submerged. Depending on tank size and setup, this heater may not thoroughly heat the entire tank.

    Pros
    • Available in 5 sizes
    • One touch temperature adjustment from 66-96°F
    • LED display shows current and set temperatures
    • Shatterproof casing
    • Built-in thermal protection circuit to prevent overheating
    • Can be installed vertically or horizontally
    Cons
    • Premium price
    • Dial and bottom must be submerged at all times
    • May not heat the entire tank thoroughly depending on setup

    4. Eheim Jager Thermostat Aquarium Heater4Eheim Jager Thermostat Aquarium Heater

     

    The Eheim Jager Thermostat Aquarium Heater is an effective glass aquarium heater. It is available in 7 sizes from 50-300 watts. This aquarium heater is made from specially made glass to protect against the heating element inside and to increase the efficacy of the heater. It can be adjusted from 65-93°F with a control knob that is easy to use. This heater is built to keep your aquarium at the temperature you set it to, and it can easily be recalibrated if it is not heating to the correct temperature. It can be fully submersed and can installed horizontally or vertically. It includes clip-on suction cups to mount the heater inside of your tank.

    It’s best to use this heater in conjunction with a separate thermostat that can be used to monitor the tank temperature to ensure the temperature is staying in range. It also may be necessary to use a bucket full of water to calibrate this heater to ensure that it is calibrated correctly before using in your tank.

    Pros
    • Available in 7 sizes
    • Adjustable from 65-93°F
    • Easy recalibration
    • Fully submersible
    • Can be installed vertically or horizontally
    • Clip-on suction cups
    Cons
    • Temperature may not stay in range
    • Heater should be tested in bucket before use in tank
    • Most of this heater should be submerged at all times

    5. Marina Betta Submersible Aquarium Heater5Marina Betta Submersible Aquarium Heater

     

    The Marina Betta Submersible Aquarium Heater is a great heater pick for tanks and bowls 1.5 gallons and smaller. This 8-watt heater is not adjustable and is only available in one size.

    This heater is small, flat, and fully submersible, so it can be installed vertically or horizontally via the attached suction cup. It is made to keep the tank temperature around 78°F, plus or minus 2°F. This heater is enclosed in polymer that is shatterproof and extremely difficult to break. It features a red indicator light to show you when it is actively heating.

    This heater does have to be fully submerged to work correctly. It’s important to monitor the water temperature with a thermostat to ensure the heater is working correctly and keeping the water at a safe temperature.

    Pros
    • Good pick for nano tanks and bowls
    • Fully submersible
    • Can be installed vertically or horizontally
    • Enclosed in shatterproof case
    • Red indicator light
    Cons
    • Needs to be fully submerged at all times
    • Temperature cannot be adjusted
    • Only available in one size
    • Only heats tanks and bowls up to 1.5 gallons

    6. Fluval Submersible Glass Aquarium Heater6Fluval Submersible Glass Aquarium Heater

     

    The Fluval Submersible Glass Aquarium Heater is a 50-watt heater made with a unique reflective coating that helps it blend into your aquarium. It measures almost 15 inches long but less than 2 inches in diameter.

    This heater has a temperature adjustment knob that allows for a temperature range from 68-86˚F. The ceramic heating element is encased in impact-resistant glass. This heater features a blue indicator light to let you know when it’s actively heating the tank. It includes two clip-on suction cups to mount it to the tank. The clips on the suction cups are silver, making them blend into the color of the heater and making them almost invisible. It can be installed horizontally or vertically.

    This heater should be almost completely submerged at all times to allow for proper function. If water is not able to circulate around the heater, then it will not work correctly and may cause damage to the heater or your tank. This heater can be plus or minus 3˚F of the set temperature, so it should be closely monitored, especially upon initial setup. This product is more expensive than some other similar products.

    Pros
    • Reflective coating helps it blend in
    • Temperature ranges from 68-86˚F
    • Blue indicator light turns on when it is actively heating
    • Clip-on suction cups blend into the heater
    • Can be installed horizontally or vertically
    Cons
    • Only available in one size
    • Needs to be almost fully submerged at all times
    • Water circulation around the heater is necessary for proper functioning
    • Will heat to plus or minus 3˚F of the set temperature
    • More expensive than some other similar products


    7. Orlushy Submersible Aquarium Heater7Orlushy Submersible Aquarium Heater

     

    The Orlushy Submersible Aquarium Heater is available in 5 sizes from 100-500 watts, making it the highest wattage heater on the list. This heater includes a free digital aquarium thermometer.

    This heater features fire-retardant padding and a rubber “crash pad” to prevent damage if it drops within the tank. It has a temperature adjustment knob that is easy to grip and use. This heater can be set from 68-89˚F and is accurate within plus or minus 1˚F. It features a red indicator light to let you know when it’s heating the water. This heater is fully submersible and can be installed horizontally or vertically.

    This heater should be almost fully submerged at all times for proper functioning. The clip-on suction cups included with this heater must be seated toward the upper part of the heater or they will be warped and damaged by the heat. The sensitivity of this heater can be too high, causing it to over or underheat with minor adjustments.

    Pros
    • Available in 5 sizes
    • Highest wattage heater reviewed
    • Rubber “crash pad” to prevent damage if dropped in the tank
    • Can be adjusted from 68-89˚F
    • Can be installed vertically or horizontally
    Cons
    • Lowest wattage option is too high for small and nano tanks
    • Must be fully submerged at all times for proper functioning
    • Suction cups must be toward the top or they will be warped by the heat
    • “Crash pad” will not protect the heater if it is dropped outside of the tank
    • Sensitivity may be too high


    8. FREESEA Aquarium Heater8FREESEA 50W Mini Aquarium Heater

     

    The FREESEA Aquarium Heater is a compact heater intended for tanks 20 gallons and below. It is available in 3 sizes from 50-100 watts.

    This heater features a LED display that shows the actual temperature within the tank at a given time. This heater can be adjusted with a single button from 59-94˚F. This heater is completely submersible and will not function correctly if it is not always submerged. This heater is compact and designed to be installed vertically or horizontally in nano and small tank setups. The heating element is seated inside of a durable plastic case.

    This heater’s temperature adjustment is done from a controller located on the electrical cord, but this controller is not waterproof and may be broken if dropped into the water. The LED display on the heater is on all the time, which makes it difficult to hide this heater within the tank.

    Pros
    • Available in 3 sizes from 50-100 watts
    • LED display shows the actual tank temperature
    • Compact
    • Can be installed vertically or horizontally
    • Heating element is inside of a durable plastic case
    Cons
    • Temperature adjustment controller is not waterproof
    • LED display stays on all the time
    • LED display does not show set temperature
    • Not intended for tanks above 20 gallons
    • Will not function correctly if not fully submerged



    9. Mylivell Aquarium Heater9Mylivell Aquarium Heater

    The Mylivell Aquarium Heater is a glass-encased heater that is available in 4 sizes from 50-300 watts. The manufacturer recommends the smallest size for tanks from 10-20 gallons, so this may not be the best option for smaller tanks.

    This heater must be almost fully submerged at all times to function, but it can only be installed vertically. This heater features a temperature adjustment knob and can be adjusted from 65-93˚F. It has a red indicator light to let you know when it’s actively heating and includes two clip-on suction cups for mounting. It also has a black rubber bumper on the bottom to prevent damage if the heater is dropped in the tank.

    This heater is not made from shatterproof glass, so it may be broken by drops or rough handling. It also may shatter if it glitches and overheats. This heater does not always heat to the appropriate temperature, so it’s important to monitor the temperature with a thermometer.

    Pros
    • Available in 4 sizes from 50-300 watts
    • Temperature adjustment knob is easy to use
    • Temperature can be adjusted from 65-93˚F
    • Includes clip-on suction cups
    • Black rubber bumper prevents damage if dropped in the tank
    Cons
    • Must be fully submerged to correctly function
    • Can only be installed vertically
    • Rubber bumper will not prevent damage to heater if dropped outside the tank
    • Glass is not shatterproof
    • Does not always heat to the correct temperature
    • Not a good option for tanks smaller than 10-20 gallons


    10. Aqueon Preset Aquarium Heater10Aqueon Preset Aquarium Heater

     

    The Aqueon Preset Aquarium Heater is available in 4 sizes from 50-200 watts. The heating element is encased in shatter-resistant glass.

    This heater is preset to 78˚F and is accurate to plus or minus 1˚F. It features a red indicator light to let you know when it’s actively heating. It includes a safety feature that causes the heater to shut off if it senses it is no longer submerged.

    This heater must be fully submerged at all times to work properly. It is not made from shatterproof glass and may be damaged if dropped or handled roughly. It is made to be installed vertically only and is not recommended for horizontal use. This heater often is not able to fully heat to the appropriate water temperature.

    Pros
    • Available in 3 sizes from 50-200 watts
    • Shatter-resistant glass
    • Preset to 78˚F and should be accurate within 1˚F
    • Safety feature shuts the heater off if it senses it is no longer submerged
    Cons
    • Glass is not shatterproof
    • Must be fully submerged at all times to work properly
    • Can only be installed vertically
    • Temperature is not adjustable
    • May not heat to the correct temperature throughout the tank


    Buyer’s Guide

    Considerations for Choosing the Right Heater for Your Aquarium:
    • Tank Size: The size of your aquarium is a major factor in determining the wattage of aquarium heater you need. A large tank will require more than a 50-watt heater while a 10-gallon tank is far too small for a 300-watt heater.
    • Tank Inhabitants: What types of fish and plants are living in your tank? Cool water fish, like goldfish, may not require a heater unless they are being kept year-round in a particularly cool area. These fish will need a heater with a lower setpoint than the level of heating that tropical fish will require. Some fish and plants are sensitive to temperature changes, so a heater that provides a more accurate and controlled temperature will be ideal for these types of tanks.
    • Available Space: Heaters come in a few different shapes and sizes, so choosing one that will fit the space you have available in your tank will serve you well. Some heaters can be installed horizontally, vertically, or at an angle, making them a good option for working around available tank space.
    • Personal Preference: What’s your vision for the appearance of your tank? If you intend to have lots of tall plants, then a wall-mounted heater that is tall and narrow may suit your tank well. If you intend to have a tank with few decorations or plants, then a flat, compact heater may blend in better.

    Temperature Adjustment Options:
    • Preset: Preset aquarium heaters cannot be adjusted. They are manufactured to stay at or close to a specific temperature and should not stray far from this preset temperature. Preset heaters that are not maintaining a steady aquarium temperature, whether it’s too low or too high, should be checked thoroughly for damage and replaced if needed.
    • Knob: Most aquarium heaters have a simple turn-knob temperature adjuster. Usually, there is a temperature range displayed on the heater itself and turning the knob will adjust a slider within the display, stopping at the set temperature. These are user friendly, even for beginners.
    • Button: Push-button temperature adjusters can be either have up and down options or may have one button that adjusts the temperature differently when it is pressed more than once. Usually, these heaters will include clear instructions explaining how to use the button or buttons to set the heater safely and correctly.
    • Controller: Heaters that have controller-adjusted temperature settings usually have a controller built into the electrical cord of the heater. A controller may have a simple push-button design, or it may feature a LED display that clearly shows changes made to the settings.

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    Conclusion

    Did these reviews help narrow your options for choosing a new aquarium heater?

    The best overall pick is the Aquatop Submersible Glass Aquarium Heater, but it’s closely followed by the premium Cobalt Aquatics Electronic Aquarium Heater and the best value Tetra HT10 Submersible Aquarium Heater. These three are the best picks out of the 10 products reviewed, but all 10 products have plenty of strong points!

    Finding the right aquarium heater for your tank will ensure the health and safety of your fish, plants, invertebrates, and even corals. There are options here for tanks from 1.5 gallons to 100 gallons or more, so there are great options for almost any tank setup.