This wiki has been updated 14 times since it was first published in February of 2017. When it comes to taking care of your fish, environmental maintenance is one of the most important considerations. For that reason, you’ll need one of these reliable aquarium heaters to help keep your aquatic companions comfortable. Many function in both fresh and saltwater tanks, will shut off for safety when removed, and will even adjust the water temperature automatically as it fluctuates. When users buy our independently chosen editorial recommendations, we may earn commissions to help fund the Wiki. Skip to the best aquarium heater on Amazon.
10. Aqueon Pro
The resilient aluminum core of the Aqueon Pro maintains steady temperatures between 68 and 88 degrees Fahrenheit. Equipped with an electronic thermostat, it’s programmed to shut off automatically if it’s removed from the water.
- Shatterproof build
- Easy-to-use control knob
- It’s pretty bulky
9. Fluval E Series
The Fluval E Series feature sleek, slender profiles and LCDs that change color whenever the tank’s temperature varies from a preset value. If that variation exceeds 5-1/2 degrees Fahrenheit, they will flash to alert you of a potential risk.
- Come in a pack of 3
- Independent mounting brackets
- Not for horizontal placement
8. Eheim Jager
The versatile Eheim Jager is made of durable glass in a shock-resistant design that can withstand any type of aquatic environment. Its useful amber indicator light helps you verify that it’s functioning without having to get your hands wet.
- Generously long power cord
- A good value for the price
- Initial calibration is a pain
7. Cobalt Aquatics Neo-Therm
Boasting a sleek, flat construction, the Cobalt Aquatics Neo-Therm is fully submersible and can be positioned at any angle you prefer. Its one-touch programming ensures you can maintain accuracy to within 1/2 a degree Fahrenheit.
- Suitable for up to 55 gallons
- Backed by a 3-year warranty
- Suction cup mount is not very strong
6. Tetra HT
The handy green and red indicator lights of the Tetra HT let you know when it’s adjusting the temperature and when it’s on standby. It can be placed either vertically or horizontally, and its small footprint makes it easy to conceal behind plants or other aquatic decor.
- Shock-resistant tube
- A budget-friendly choice
- No protective guard
5. Ista In-Line
Designed for efficiency and reliability, the Ista In-Line is equipped with a heat pump and two thermal sensors that work in tandem to minimize temperature fluctuations. It samples tank water at both its inlet and outlet to ensure consistency and accuracy.
- Durable flame-sprayed coating
- Works with most canister filters
- Displays in celsius only
4. Hydor Original
Suitable for either marine or tropical freshwater fish, the innovative Hydor Original installs externally and fits over the return lines coming from canister filters or sumps. It runs silently and includes a built-in clamping system that allows for easy plumbing.
- Sturdy plastic casing
- Overheat protection
- Simple to set up
3. Catalina RF-1000T
The Catalina RF-1000T works well in tanks with a capacity of between 150 and 400 gallons. It’s equipped with a durable flow-through guard and a safety sensor that powers it off immediately if it’s accidentally exposed to the air.
- Rust-resistant titanium tubing
- 14 inches in length
- Reliably impact resistant
2. Hygger Submersible
Available in 50-, 100-, and 300-watt options, the Hygger Submersible is built with safety in mind, and features overheat protection and an automatic shutoff in the event of an electrical fault. It can be hidden easily behind plants or rocks, thanks to its compact size.
- Shatter-resistant design
- Built-in thermometer
- Handy led status indicator
1. Finnex Digital
The Finnex Digital offers corrosion-resistant titanium tubing and an alarm that’s triggered if the water becomes too hot or too cold. It’s suitable for either indoor or outdoor use, and works well in backyard ponds and greenhouses.
- Large bright display panel
- User-friendly interface
- Retains settings after power outage
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