What Size Heater for a 29 Gallon Aquarium?

Get the right heater for your 29-gallon aquarium with our sizing guide. Keep your fish happy and healthy with reliable heating – order now!

If you’re setting up a 29-gallon aquarium, one of the key things you’ll need to consider is what size heater you should use to keep the water at the right temperature for your fish and other aquatic inhabitants. In this blog post, we’ll take a look at some of the factors that can affect your decision and give you some tips for choosing the right heater for your tank.

Firstly, it’s important to understand why you need a heater for your aquarium. While some fish species can tolerate a wide range of temperatures, many require specific temperature ranges to thrive. A heater will help you maintain a consistent temperature in your tank, which is essential for keeping your fish healthy and happy.

So, what size heater do you need for a 29-gallon aquarium? The answer will depend on a few different factors, including the ambient temperature in your home, the type of fish you’re keeping, and whether or not you’re using a filter or other equipment that generates heat.

As a general rule, you’ll want a heater that can provide approximately 5 watts of power per gallon of water in your tank. So, for a 29-gallon aquarium, you’ll need a heater that can produce around 145 watts of power. This will help ensure that your tank stays at the right temperature, even if the ambient temperature in your home fluctuates.

Of course, this is just a rough guideline, and there are other factors that can affect your decision. For example, if you’re keeping cold-water fish that don’t require a heater, you obviously won’t need one at all. On the other hand, if you’re keeping tropical fish that require a specific temperature range, you may need to choose a heater that can produce more than 5 watts per gallon to compensate for factors like ambient temperature, lighting, and other equipment.

Another thing to consider when choosing a heater is the type of heater you want to use. There are several different types of aquarium heaters available, including submersible heaters, hang-on-back heaters, and inline heaters. Submersible heaters are the most common type and are typically the easiest to use, but they can take up valuable space in your tank. Hang-on-back heaters are a good option if you’re short on space, but they may not be as effective at maintaining a consistent temperature throughout your tank. Inline heaters can be a good choice if you have a canister filter or other equipment that can accommodate them, but they can be more difficult to install and maintain.

When choosing a heater, it’s also important to consider the quality of the heater and the manufacturer’s reputation. A poorly-made heater can be dangerous and may not work effectively, so it’s important to choose a reputable brand and read reviews from other aquarium owners before making a purchase. Look for heaters that have safety features like automatic shut-off and temperature controls to help prevent overheating and other issues.

In summary, choosing the right size heater for your 29-gallon aquarium will depend on a variety of factors, including the type of fish you’re keeping, the ambient temperature in your home, and the other equipment you’re using in your tank. As a general rule, you’ll want a heater that can produce around 5 watts of power per gallon of water in your tank, but you may need to adjust this based on your specific needs. Take the time to do your research and choose a high-quality heater from a reputable manufacturer to ensure the health and happiness of your aquatic pets.

Best Aquarium Heaters – Best Seller #1

Orlushy Submersible Aquarium Heater,100W Adjustable Fish Tahk Heater with 2 Suction Cups Free Thermometer Suitable for Marine Saltwater and Freshwater

• ★100W aquarium heater is suitable for 10 to 20 gallons aquariums,Length – 9″,voltage 110-120V, power cord is 6ft, please choose the right wattage aquarium heater according to our size chart.
• ★It shows an area to adjust the temperature. It’s not exactly accurate but it turns easy and can be adjusted at small intervals
• ★Explosion Proof: 2mm thickened quartz glass,can be used in fresh water and salt water aquariums,easy to hide in the tank.
• ★Precise temperature dial from 68 to 89°F allows for complete control of aquatic climate within a 1-degree difference.
• ★Adjustable Aquarium Fish Tank Water Heater Sensitive and reliable thermostat maintains uniform temperature. Automatic shut off when the temperature is reached

Buy on Amazon

Submersible Aquarium Heaters – Best Seller #2

HiTauing Aquarium Heater, 50W/100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature Protection and Automatic Power-Off When Leaving Water for Saltwater and Freshwater

• 【Rapid Heating and Two Temperature Control System】300W aquarium heater is sutable for 40-75 gallon fish tank and made of the most stable nickel-chromium heating wire, which can quickly and stably conduct heat to the surroundings. It has a built-in temperature control system of Fahrenheit and Celsius(Temp range: 63-94℉/17-34℃). You can press and hold the button next to the controller for 2-3 seconds to switch.
• 【Intelligent Water Sensor and Over Temperature Protection】This fish tank heater has a unique intelligent temperature and water sensor system, the heater will automatically stop heating when the heater is completely out of water or it rapidly heats beyond the set temperature, the indicator light will turn green in both cases to ensure the maximum safety of you and your aquatic organisms just like protecting our own safety.
• 【Explosion-proof Quartz Glass Aquarium Heater】The submersible aquarium heater is made of explosion-proof quartz glass material and a high-temperature resistant nickel-chromium heating wire with silicon carbide heat conduction, faster water heating and longer lasting. And the stronger black shell is a high temperature resistant ABS material which protect the fish, your aquatic organisms and you from scalding.
• 【Accurate External Digital Display Controller】The external IC temp controller of this aquarium water heater can show the water temp with 2 red LED digits. The temperature in Fahrenheit and Celsius is displayed, which can be switched by pressing and holding the button for a few seconds. To set the temp, just press the button over and over until the screen displaying the temp you desired, the setting is done and the led shows the current water temp again.
• 【Wide Range of Use】This 300 watt adjustable aquarium heater is suitable for many occasions. The fish market is a common place for us. It can maintain the freshness of fish. They are also suitable for places where aquatic life such as fish tanks, aquariums, and small fish ponds are kept. There are strong suction cups on the heater guard and the thermometer, it’s easy to install the aquarium heater no to the tank walls or bottom, please keep them fully submerged.

Buy on Amazon

Aquarium Heater Reviews – Best Seller #3

Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt

• All Tetra HT heaters have indicator lights to let you know when the heater is on. It will be red when heating and green when the proper temperature has been reached.
• The HT10 uses a built in electronic theromstat to automatically maintain water at 78° F which is ideal for most tropical fish. No adjustment is requried.
• Ideal for aquariums between 2 to 10 gallons with hoods or glass canopies
• The HT heater is fully submersbile and can be installed vertically or horizontally. It’s small footprint makes it easy to conceal behind plants or other décor.
• Please read all label information upon delivery. DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.

Buy on Amazon

Fish Tank Heaters – Best Seller #4

HITOP 25W 50W 100W 200W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cup (50W)

• HITOP aquarium heater 50W, length 7.2-inch, power cord 4.9ft, designed for small fish tanks, recommended for aquariums up to 15 Gallons.
•  Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes, your pets will no longer fear the winter.
• Adjustable and easy to use: This aquarium heater, adjustable temperature range 68 ~ 93 °F, after setting the temp you want, will on or shut off automatically when the water temperature changes, no extra adjustment is required.
• Accurate Temperature Control: This fish tank heater built-in thermostat, will automatically keep the water at the set temperature within±2°F error. Comes with an sticker thermometer to detect water temp at any time.
• Easier installation, you can install it with any angle by 2 powerful suction cups, just make sure it is under water fully. Besides, we provide 1 more extra suction cup for spare (total 3 PCS), and we provide 12 months warranty.

Buy on Amazon

Saltwater Aquarium Heaters – Best Seller #5

Aqueon Aquarium Fish Tank Preset Heater For Up To 40 Gallons, 100 Watts

• Preset to 78 degree, accurate to plus/- 1 degree
• No adjustment required
• Shatter resistant
• Fully submersible, auto shut-off when overheats, resets when cools down
• LED light turns on when aquarium water is being heated
• Ideal for aquariums up to 30 gallons

Buy on Amazon

Freshwater Aquarium Heaters – Best Seller #6

Tetra 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt,Multicolor

• All Tetra HT heaters have indicator lights to let you know when the heater is on. It will be red when heating and green when the proper temperature has been reached.
• The HT20 uses a built in electronic theromstat to automatically maintain water at 78° F which is ideal for most tropical fish. No adjustment is requried.
• Ideal for aquariums between 10 to 30 gallons with hoods or glass canopies
• The HT heater is fully submersbile and can be installed vertically or horizontally. It’s small footprint makes it easy to conceal behind plants or other décor.
• Please read all label information upon delivery. DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.

Buy on Amazon

Adjustable Aquarium Heaters – Best Seller #7

Hitop 50W/100W/300W Adjustable Aquarium Heater, Submersible Glass Water Heater for 5 – 70 Gallon Fish Tank (50W for 5-15 Gallon)

• Explosion Proof: The aquarium heater is made of 2mm thickened quartz glass, 33% thicker than ordinary glass, explosion-proof, not easy to crack, which is very safe for people and aquatic animals.
• Application: 50W water heater is suitable for 5 – 15 gallon tank, also suitable for both saltwater and freshwater, suitable for fish tanks and turtle tanks, must be completely submerged in water when using.
• Accurate Temperature: The fish tank heater can be adjusted from 68°F to 93°F (20°C – 34°C), comes with a thermometer sticker, convenient to detect the water temperature without another pay.
• Long Service Life: This fish heater adopts 8-slot multi-branched heating wire ceramic frame, shorter length, 7.8*1*1 in(20*2.5*2.5 cm), better heat dissipation, and can save more space for your fishes.
• Complete Accessories and Warranty: This aquarium submersible heater comes with accessories you need, in addition to the thermometer, it comes with 3 suction cups, one for replacement, and offer 12 months warranty, giving you peace of mind after your purchase.

Buy on Amazon

Digital Aquarium Heaters – Best Seller #8

AQQA Submersible Aquarium Heater,100W/200W/300W/500W/800W/1200W Fish Tank Heater,External Temperature Controller LED Temperature Display with 2 Suction Cups Suitable for Saltwater and Freshwater

• 【Explosion-proof Quartz Glass Aquarium Heater Durable and Safer】The heater made of explosion-proof quartz glass material and a high-temperature resistant nickel-chromium heating wire with silicon carbide heat conduction,faster water heating and long lasting.2 hours heating 1℃.The shell is a high temperature resistant PC material, which can effectively protect the fish from scalding.
• 【Temperatures Ranges 59℉ to 93℉,Automatic Heating】The heating rod built-in thermometer,When the water temperature is lower than the set temperature by 1℉, the heater will automatically heat up, and stop heating when the water temperature is consistent with the set temperature.Fahrenheit and Celsius can be converted to each other,Pressing and holding for 5 seconds changes temperature display from Celsius to Fahrenheit.
• 【LED External Controller with Indicator Light】The controller is not waterproof, please keep away from water，LED digital display screen shows the current water temperature and preset temperature.The number above the controller is the current water temperature, and the number below is the set temperature,Red light means heating,Blue lights indicate constant temperature,blue light flashing indicates the heater not fully submersibled.
• 【Memory Function,Dry Burning-resistant Protection】Controller with memory function,If power is shut off,the heater will keep the temperature settings until it powers on again,no need to worry about pets when you going out.When the heating rod is 5cm above the water surface, the heating rod will automatically power off, and the controller will display “E1”. When submerged in the water again, the heater will automatically return to normal, no need to unplug the power or reset the controller.
• 【Controller Can Be Installed with Adjustable Hooks】A hook can be installed on the back of the controller to hang on the fish tank. The installation is very simple and no tools are needed.The size of the hook can be adjusted according to the thickness of the fish tank，Very safe and reliable.AQQA products enjoy a 1-year warranty, please rest assured to buy.

Buy on Amazon

Titanium Aquarium Heaters – Best Seller #9

DaToo 50 Watt Aquarium Heater Submersible Adjustable Temperature Fish Tank Heater 50W

• 【50W DaToo Aquarium Heater】: A suitable temperature is very important for our beloved fish. No suitable temperature, our fish will not survive healthy. How to create this comfortable temperature? DaToo will help you. The DaToo Submersible Aquarium Heater is a system that create a warm and comfortable living environment for your lovely fish. Select DaToo Aquarium Heater, Let us care about your fish starting from the water temperature.
• 【Adjustable Temperature】: Only need turn the knob on the top of the DaToo fish tank heater, You can easily get the temperature you want（68 to 93°F) and you can read the temperature you set by the dial of the aquarium heater. Perfect Thermostat system to ensure that your beloved fish can be happy and comfortable life. Very Convenient !
• 【Sturdy And Durable】: Still worried about the heater will be broken?Now let’s say goodbye to this worry. The shell of the DaToo Aquarium Heater is made with Shatterproof, Corrosion resistant, Wear-resistant microcrystalline glass(glass-ceramics), can be used in fresh water and salt water.The heating part is made of nickel-chromium alloy, ensure superior heat transfer and enhanced service life. Select DaToo Fish Tank Heater, Let it serve your fish forever.
• 【BPA Free And Energy Saving】: Every plastic component of the DaToo Fish Tank Heater is made with durable, high-quality, BPA-free plastic. The process of heating does not produce invisible toxins. This means it is safe not only for your fishes, but for you as well. Stepwise heating mode, it will automatically turn on and off to keep your set temperature, reduce electricity consumption. Select DaToo Aquarium Heater, not only care about your fish, but also save electricity fee for you.
• 【Attention】: This is 50W DaToo Aquarium Heater, 7.6inch, fit 5 to 15 gallons tank with hoods or glass canopies and keep the water flowing. Please make sure that the heater is completely submerged in the water when using it. We provide One Year Warranty and 100% Money-back Guarantee. Select DaToo Products= Own A Private Aquarium Housekeeper.

Buy on Amazon

Glass Aquarium Heaters – Best Seller #10

Fluval M50 Ultra-Slim Submersible Aquarium Heater – 50W Underwater Heater for Aquariums up to 15 Gal.

• Modern Aesthetic: M-Series heaters combine modern aesthetics with reliable Italian construction. Employing an ultra-slim profile, these heaters are a welcome departure from traditional, bulkier designs.
• Reflective Design: This heater is encompassed in a heat-and-shock resistant reflective Borosilicate glass tube, which allows it to reflect the surrounding aquarium colors, allowing it to blend in with the environment and enhance overall aesthetics.
• Temperature Control: Computer-calibrated thermostat has an easy-to-adjust temperature control dial and an on/off blue indicator light to display when it’s in use.
• Slim Profile: Ultra slim design allows for easy installation in your aquarium tank.
• Recommended Size: M50 underwater heater is ideal for freshwater and saltwater aquariums up to 15 gallons. Each M-Series heater comes with a 3-year limited warranty.

Buy on Amazon