Like most people, you probably think 100 watts is enough to heat your aquarium. Unfortunately, this isn’t always the case. 100 watts may be enough to heat a small aquarium or a single fish tank. You’ll need a more powerful heater if you have a large aquarium or multiple tanks.
Aquarium heaters come in a variety of sizes and capabilities. The size and power of the heater you need will depend on the size of your aquarium and the number of fish tanks you have. You’ll need a more powerful heater if you have a large aquarium or multiple tanks.
When choosing an aquarium heater, it’s important to select one that is durable and can withstand the elements. Aquarium heaters are exposed to moisture and humidity, so it’s important to choose one that is rust-resistant. Additionally, you’ll want to select a heater with a thermostat so you can control the temperature of your aquarium.
If you’re looking for a durable and reliable aquarium heater, the 100-watt Aquarium Heater from EHEIM Jager is a great option. This heater is made of stainless steel and is rust-resistant. Additionally, it features a built-in thermostat so you can control the temperature of your aquarium.
Top 10 Best Selling List for Aquarium Heater 100 Degrees
- Aqueon Preset Aquarium Fish Tank Heater 100 Watts
- Fluval E300 Advanced Electronic Heater, 300-Watt Heater for Aquariums up to 100 Gal., A774
- HITOP 25W 50W 100W 200W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cups (100W-grey)
- EHEIM Jager Aquarium Thermostat Heater 100W ( Pack of 1)
- NICREW Preset Aquarium Heater, Submersible Fish Tank Heater with Electronic Thermostat, 100 Watt, for 10 to 25 Gallon Tank, UL Listed
- Aqueon Submersible Aquarium Heater 100 Watts
- HITOP PTC Adjustable Aquarium Heater, Sturdy Fish Tank Heater with Protective Cover, 100W/200W/300W/400W Heater for Fresh/ Saltwater Fish/Turtle Tank up to 120 Gallon
- EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1
- FREESEA Aquarium Fish Tank Heater: 100 Watt Submersible Betta Heater – Adjustable Thermostat with Thermometer for 15-25 Gallon Marine | Saltwater | Freshwater
- YukiHalu Small Submersible Aquarium Heater, Mini Fish Tank Heater 25W 50W 100W 200W with Built-in Thermometer, External Temperature Controller, LED Display, Used for 5/10/20/40 Gallons (25 Watts)
Best Seller #1
Aqueon Preset Aquarium Fish Tank Heater 100 Watts
- Preset to 78°, accurate to +/- 1°
- 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
Best Seller #2
Fluval E300 Advanced Electronic Heater, 300-Watt Heater for Aquariums up to 100 Gal., A774
- Aquarium heater with dual temperature sensors provide accurate and real-time water temperatures
- LCD temperature display available in both Fahrenheit and Celsius; with a range of 68 to 93 degrees Fahrenheit
- Fast heat technology built with a safety shut-off and integrated fish guard to protect fish and invertebrates
- Equipped with a slim profile mounting bracket and colored display alert system
Best Seller #3
HITOP 25W 50W 100W 200W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cups (100W-grey)
- 🐟 100W aquarium heater, length 8.8-inch, power cord 4.9ft, designed for small fish tanks, recommended for aquariums 15 to 30 Gallons.
- 🐟 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.
- 🐟 Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes.
- 🐟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.
Best Seller #4
EHEIM Jager Aquarium Thermostat Heater 100W ( Pack of 1)
- Fully submersible
- Thermo safey control protects against running dry
- Will automatically turn off when water level dips too low
- TruTemp dial recalibrates the heater for precise temperature regulation
- Made of shock resistant and shatter proof glass for fresh or marine water
- On/Off indicator light for at-a-glance monitoring
Best Seller #5
NICREW Preset Aquarium Heater, Submersible Fish Tank Heater with Electronic Thermostat, 100 Watt, for 10 to 25 Gallon Tank, UL Listed
- Preset to 78°F – no adjustment required, electronic thermostat automatically maintains water temperature
- Made from shatter-resistant quartz glass, which helps to keep your fish and other aquarium dwellers safe
- LED indicator light displays red when actively heating, off when temperature reached
- Automatic safety shut-off and overheat protection
- 100 watt heater is designed for 10 to 25 gallon aquariums
Best Seller #6
Aqueon Submersible Aquarium Heater 100 Watts
- Fully submersible, auto shut-off when overheats, resets when cools down
- Electronic thermostat stops heating once set temperature is reached
- Precise temperature setting adjustable to 1° F (68-88° F)
- LED light turns on when aquarium water is being heated, automatic safety shut off and overheat protection
- For fresh or saltwater aquariums up to 40 gallons
Best Seller #7
HITOP PTC Adjustable Aquarium Heater, Sturdy Fish Tank Heater with Protective Cover, 100W/200W/300W/400W Heater for Fresh/ Saltwater Fish/Turtle Tank up to 120 Gallon
- 🐟 [Shatterproof 300w aquarium heater] The hard protective cover and shatterproof materials make this aquarium heater sturdy, can be used for large fish and turtles. Suitable for medium and large fish tanks of 50-90gallon, sea water and fresh water.
- 🐟 [Adopting PTC ceramic heating element] PTC means ‘Positive Temperature Coefficient ‘, indicates that this heater uses a positive temperature coefficient thermistor，it has the advantage of safe, fast heating, and good insulation performance, and most importantly, is shatter-proof very sturdy.
- 🐟 [Adjustable and easy to use] The Adjustable rang of this fish tank heater is 63-90°F. After setting the temp you want, the heater will automatically stop heating when the water temp reaches the set-temp, and it will automatically start heating when the water temp is lower than the set-temp, easy to operate.
- 🐟 [Accurate temperature control] This fish heater built-in sensitive temperature detection device which can sense the water temp change in time, so that it can keep the fish at a comfortable temperature accurately. The error is within 2 degrees.
- 🐟 [Removable protective cover] This aquarium heater has a detachable protective cover, which can not only protect aquarium pets, but also can be easily removed for cleaning. Comes with 4 suction cups and a stick-on thermometer to help install. Providing 12 months warranty service.
Best Seller #8
EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1
- The product is highly durable
- The product is easy to use
- Manufactured in China
- Heating elements are durable and are threaded for easy replacement
- Activation Flow – 0.3 GPM
Best Seller #9
FREESEA Aquarium Fish Tank Heater: 100 Watt Submersible Betta Heater – Adjustable Thermostat with Thermometer for 15-25 Gallon Marine | Saltwater | Freshwater
- 【100 Watt Aquarium Heater】This fish tank heater is suitable for 15-25 gallons tanks. Voltage 110-120V. Power cord length is 4ft. With 2 strong suction cups, it’s easy to install it on glass, acrylic, and plastic tank. Great for freshwater and saltwater aquariums.
- 【Adjustable Temperature】Just turn the knob on top of the tank heater and you can easily get the temperature you want (From 64℉ to 93℉). The fish heater comes with a submersible thermometer, so it’s convenient to check or adjust the temperature in real-time.
- 【Automatic Constant Temperature】With the intelligent temperature control system, it can make us keep fish more easily. No need to worry about overheating situation. When the water temperature is lower than the set value, the heater starts heating and the indicator light is on. When the water temperature reaches the set temperature, the heater stops heating and the indicator light goes off to keep the constant temperature.
- 【Sturdy and Durable】FREESEA submersible heater are made of 2mm thickened quartz glass material, which is resistant to breakage, corrosion, and abrasion. With high temperature-resistant nichrome wire, the water heats up faster and longer service life.
- 【Satisfaction guaranteed】Our aquarium heater are made with durability and safety in mind for each design. If you have any questions, please feel free to contact us! We will gladly offer a prompt, courteous refund or a new replacement. 12 Month Warranty and 24 Hours Professional After-sales Service.
Best Seller #10
YukiHalu Small Submersible Aquarium Heater, Mini Fish Tank Heater 25W 50W 100W 200W with Built-in Thermometer, External Temperature Controller, LED Display, Used for 5/10/20/40 Gallons (25 Watts)
- 【Super Mini Size, 25Watt for 1-5 Gallons】 YukiHalu 25W aquarium heater is designed for 1-5 gallons mini fish tank. Compact design, take less space in the fish tank, easy to hide in the tank. Temperature can be accurately adjusted from 64 to 93°F. This heater suitable for both saltwater and freshwater. The rated voltage is 100-130V.
- 【Automatic Constant Temperature with 1℉Accuracy】Thanks to advanced Intelligent Frequency Conversion Technology, the water temperature can be kept constant with an accuracy of 1℉. The heater’s working frequency will be changed according to temperature variation, and the heating is automatically stopped when the set temperature is reached. Compare to traditional heater, this new technology will cut down 49% electricity bill for you.
- 【Overheating Protection, Out of Water Protection】The power will be cut off and stop heating automatically if the heater out of water or overheating. Protect your fish. Never cook your fish. 30days full refund, 12-months warranty.
- 【External Temperature Controller, Never Wet Your Hands】Use an external controller to set the temperature instead of immersing your hands in water to rotate the dial. Never wet your hands or contaminating your tank. Strong suction cups, easy to install.
- 【Built-in Thermometer, Power-off Memory Function】Dual built-in temperature sensor, the water temperature will be displayed on the external temperature controller in real time. No need to buy other aquarium thermometer. The heater will remember the temperature setting, no need to reset the temperature after power off.
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How many gallons can a 100 watt heater heat?
According to Energy Star’s website, a 100-watt heater can heat approximately 3.5 gallons of water in an hour. This assumes that the water is at room temperature and that the heater is placed in an enclosed space. The amount of time it would take to heat the water will vary depending on the starting temperature of the water and the surrounding environment. Energy Star provides a calculator on their website that can help estimate how long it would take to heat water using a 100-watt heater.
What size aquarium is 100 watt heater for?
The 100 watt heater is recommended for between 30 and 40 gallons of aquariums. This size aquarium will provide enough space for the fish to swim around and the plants to grow. The 100 watt heater will also help to keep the water at a consistent temperature.
How many watts should my fish tank heater be?
Heaters are an important part of any fish tank setup. They help to maintain a consistent water temperature, which is crucial for the health of your fish. But how do you know which heater is suitable for your tank?
The size of your heater will depend on the size of your fish tank. A good rule of thumb is to use a heater rated for 10 watts per gallon of water. So, for a 50 gallon tank, you would need a 500 watt heater.
Another important factor to consider is the temperature of your room. If your room is cooler, you may need a larger heater to maintain a consistent water temperature.
When choosing a heater for your fish tank, it is important to consider the size of your tank and the temperature of your room. A good rule of thumb is to use a heater rated for 10 watts per gallon of water. With these factors in mind, you can choose the perfect heater for your fish tank!
Is a 100 watt heater good for a 30 gallon tank?
There are a few things to consider when trying to answer this question. The size of the tank is an important factor, as a 100 watt heater will not be sufficient for a very large tank. The type of fish you have also plays a role, as some fish require warmer water than others. In general, however, a 100 watt heater should be sufficient for a 30 gallon tank. If you have any concerns, it is always best to consult a professional before setting up your aquarium.
How many watts does a 100 gallon fish tank need?
A standard 100 watt aquarium heater will raise the temperature of a 40 gallon fish tank by approximately 10 degrees Fahrenheit. So, you can use this information to determine how many watts your 100 gallon fish needs. To maintain a 72 degree Fahrenheit tank, you’ll need a 400 watt aquarium heater.