This is why you should never mix cold water and tropical fish in the same aquarium, as their needs are completely different! In product descriptions for tank heaters, you may have seen some wildly different promises of the size of tank certain wattages can efficiently heat. Below is a very rough guide of what size aquarium a heater will be able to sufficiently heat per wattage. Another thing people tend to forget to take into account when choosing their power of heater is their own room temperature.
If you live in a particularly cold area of the country, you may need a more powerful heater to sufficiently raise temperatures. People often worry about heaters because the idea of placing an electrical device into some water seems completely at odds with everything we know about electrical equipment.
However what you have to remember is that these products have actually been designed for that very purpose and so are actually perfectly safe. So make sure you regularly check over your equipment to ensure they are no broken parts or frayed wires!
Disclosure : Your support helps keep this site running. We may earn a referral fee for some of the services we recommend on this page. Best Aquarium Heaters for Navigate this Article. Add a header to begin generating the table of contents. Our Top Picks. Image Product Details Best Overall. Best For Choice. Best Overall. Features LCD water temp display Integrated fish guard provides advanced protection Easily adjustable heater bracket.
Specifications Weight: g w Dimensions: 5. The power cord is 1. Features Easy to access temperature changes Impact resistant glass and guard Huge choice in other power levels. Specifications Weight: g Dimensions: 2. Features Really accurate temperature setting Super thin Easy to set up. Specifications Weight: g Dimensions: 48 x 29 x - 48 x 29 x cm Wattage: 25, 50, 75, , W.
Features Explosion Proof: 2mm thickened quartz glass Space saving and higher stability Extra stick-on thermometer and sucker cup included Suitable for both fresh and marine water.
Specifications Weight: g w Dimensions: Specifications Weight: g w Dimensions: 24 x 2. Features Quartz Glass Thermostat Heater 9 different wattages available! Heat up to a L tank! Safe and secure, what more could you want? Specifications Weight: g 50w Dimensions: Features Two variations available Low maintenance - just clean once per year. Specifications Weight: g Dimensions: 5. Features High precision temp control Positive thermal coefficient technology Unique external filter for sumps or external filtration.
This heater does have an overheat sensor, but I still gave it a ranking of only 1. Any fish in the tank would be long dead before the water reached this temperature. Installing this heater takes a little more work because you have to mount all three parts. The temp probe and the heating unit are easy to suction cup to the inside of the tank. But, mounting the control unit is a major pain.
The suction cup for the control module is the same as the ones that you use to attach the heating unit inside the tank. The ones inside the tank work great, but it just is not strong enough to hold up the surprisingly heavy control until. I have two of these heaters and the suction cups for both control units just will not stay put. I solved this in both cases by mounting a plastic thumb tack either on the wall behind the tank or on the side of the wooden tank stand.
Also, despite being rated as a watt heater, the Hygger Quartz heater struggled to maintain a consistent temp in my 55 gallon it does great in my 40 gallon. I did have to fiddle with it twice after installing to bump up the temp I would give it four hours and then check back on the temp. So, I really like the design with the built in heater guard, but this model does have some issues that knock it down in the ratings. I have a lot of experience with this particular heater.
Installation is really easy, the mounting bracket with suction cups is already attached to the heater tube. The glass has a mirror finish that is supposed to let it blend in better and be less noticable. Of course, this is completely subjective, but I think that the mirror finish and slim profile do lend the M a fancy, modern look that I really like. Sadly, no built in heater guard for this model. Read our full in-depth review for the Fuval M Submersible Heater. I was very surprised to compare it to my watt Marineland heater and find that this watt heater is several inches longer.
The Eheim heater comes with a simple bracket that you attach the included suction cups to and then simply stick the heater on the side of the tank. But, although installation was easy, it made me a bit nervous. Even in a 55 gallon tank, it felt like the heater was almost too big to be installed in the same part of the tank where my heater normally goes in the tank.
I do like how large and easy to read the temperature dial is, but getting this thermometer calibrated can be tricky. The temperature dial on this heater actually has two moving parts instead of one. The blue dial sets the temperature level of the heater, the red dial lets you calibrate the heater so that the temp you set the heater for matches the actual temp the heater warms the water to.
You can actually turn the red indicator dial so that the arrow sits on the actual temp. By making the red indicator dial match the actual temp, the heater dial should then be accurate. Getting this heater to warm the tank to the proper temp was fairly challenging. I turned the heat down a few notches, but then it was too cold. Then it was too warm again, etc.. But, I can say that once you get this heater set to the correct temp for your tank, it does a great job of holding the temp steady.
This heater does not have an overheat sensor. I have to mention that installing this heater was pretty difficult. This is pretty standard, lots of devices that utilize suction cups are like this, even several others on this list. But, these were insanely difficult to push through.
But, the holes are a bit too small, in my opinion, because it is really, really hard to get the nub on the back of the suction cup to go through. After several failed attempts, I had to get my husband to try it. Definitely, if you have any kind of trouble using your hands, you will need to ask someone to help you get this heater installed.
I do really like the heater guard on this model. It protects the ceramic heating element and should prevent most adult fish from ever touching it. I had to keep bumping up the heat using the dial.
The design is sleek and flat. This is great for the aquarist crowd that takes the aesthetics of their tank very seriously. One of the things we love about this aquarium heater is the safety and reliability you get when you buy it. This submersible aquarium heater is made with a shatterproof outer casing that pretty much guarantees this thing will stay intact. It also comes with some pretty advanced internal safeguards that will stop it from overheating, and a reliable auto shut off feature.
It also has a clear LED display that makes it easy to see the temperature of your tank and the temp that your heater is set to. The Fluval E Electronic Heater also heats the water surprisingly quickly.
Fluval offers a 5-year warranty on this product as well, which we think is fantastic. Compared to some of the other fish tank heaters out there, this is priced very reasonably. Installation is simple too. Overall you should be able to have this heater up and running in 30 minutes if you follow the instructions. Simply put, this is just a solid and small heater.
This is a fish tank heater that packs a punch provided you use it with the right tank size. This is a submersible heater and it comes with very well-made suction cups that make it easy for you to attach it to the side of the tank.
The Eheim is fully submersible and comes with the standard safety features that you would expect from all of the best aquarium heaters. This means if the water temp exceeds the safe range of fluctuation, this will either kick in or turn off. If the water level drops below an acceptable point it will turn off to prevent any issues that could compromise your tank or the life inside it.
Honestly, at this point this is something we expect from pretty much all of the best aquarium heaters, but to have this available at such an affordable price point is nice to see. This submersible fish tank heater by Hygger is a departure from a lot of the other designs on our list.
While a lot of the other heaters are plastic and feature a dark design, the Hygger stands out. It features a titanium heating element that can work in fresh and saltwater.
This design makes it very resistant to any of the standard seawater issues that plague a lot of other heaters. One of the other features that makes this heater stand out from the pack is its massive temperature range. It also comes with very effective temperature control and monitoring system. You can expect very little water temp fluctuation with this heater.
This is a very well-rounded option that can be used in tanks ranging from gallons and comes at a very reasonable price. This submersible heater comes with a very attractive and compact design that can be tucked pretty much anywhere in your tank. It has a great LED display that makes it easy to monitor the water temperature in your tank without being a distraction.
The different units come with a watt range from 50W to W and have all the standard safety features that you would come to expect from a quality manufacturer. The biggest downside we can find with this heater is that it only comes with a month warranty. The entire goal of your aquarium should be to mimic the ecosystem your fish are used to living in when it comes to water conditions. Everything needs to be stable and safe. If your aquarium heater does a poor job of regulating the water temperature, this can cause serious health problems for your fish sometimes even resulting in death.
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