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

I currently use seven of these heaters in various freshwater aquariums (three 50W, two 200W, and two 500W models).Performance & Reliability: While I've only had them for a few months, they've been consistently reliable and accurate in temperature regulation.In one of my tanks, I have two of these heaters, each on a separate external temperature controller (heater set at 80°F with secondary thermostat at 74°F), creating excellent redundancy. This arrangement provides complete fault tolerance - the tank would only overheat if both the heater and its corresponding thermostat failed simultaneously, and would only drop to room temperature if both heating systems failed together. Despite being power-cycled multiple times daily through this setup, the heaters maintain their setpoints and continue to function flawlessly.Design Improvements vs. standard heaters:These should theoretically outlast traditional heaters for two reasons:-They use thermocouples instead of bimetallic strip thermostats, which are less prone to wear-The control logic is located outside the water in a pod on the cord, reducing water exposure to electronicsInstallation Consideration: The only potential issue is that the heater is permanently attached to the temperature controller. This means the thinnest part of the assembly is actually the heater itself. For tanks requiring the power cord to pass through a small opening (like my euro-braced tank which does not use a conventional lid), you'll need an opening large enough for the entire heater assembly to pass through.Additional Features: They include an extra suction cup, which is a thoughtful touch.**General Aquarium Advice:** For any aquarium setup, I strongly recommend using two smaller heaters rather than one large one. This provides limited fault tolerance without introducing the complexity of my external thermostat setup. If a heater sticks on, being lower-wattage, it will take longer to overheat the tank, and if a heater sticks off the other will still provide some heat. I wouldn't trust any brand of heater without at least this level of redundancy.Bottom Line: Highly recommended based on my experience so far. These heaters deliver on the essentials with some smart design improvements over traditional models.

I’ve had this for only two days so my rating will be high. If something goes wrong, then I will let the Amazon community hear about it. For now, it is performing as expected and heated up my pond , which is outside, of course, but it heated it up from 65 to 76 in a very quick time frame. It’s basically very friendly and you just set it and forget it!

The media could not be loaded. Instead of one big heater, I bought two 300 watt heaters for my 75 gallon aquarium.I have them both set at 74 degrees. I have verified their accuracy with several different types of thermometers.Our room temp is 65 degrees during the cool / cold months.Between the two heaters it seems that they are hardly working. The green lights mean that they are not actively heating. When they are heating there is a red light instead of green.Running two smaller heaters rather than one big one is good because I have a backup. Plus, neither one is taxed with the job of doing it all by just one heater.So far the heaters are working superbly. Staying right where they should be.I really like the visibility of the controllers. They are easy to operate and set.I also like the fact that the heaters themselves are black. They just blend right in.Also, these heaters have a three prong grounded plug and the cords are heavy gauge.I do not understand why some heaters are made without the ground plug.I am 110% satisfied with these heaters!

It works great for my 65 gallon saltwater tank. Heated it up to the right temperature in no time now my fish and corals are happier with the warmer water. I put a thermometer in the water to see if any fluctuations happened and it has stayed stable at 77 degrees F for the last week since I've gotten it. Highly recommend.

Works well, cord's a little short

My turtle Spazzy Spazzy Spazzerson loves it! Okay, so definitely a great price, super easy to set up and clean. Keeps his tank nice and toasty, just like he likes it and isn’t huge so doesn’t take up a lot of space. Great product and turtle approved.

So far, good product. Have had the tank set up for little over a month now. Water stays at a consistent temp and my fish seem to be happy. No complaints from me on this item.

It burnt up in my aquarium. Maybe I got a defective one. I bought this 300 watt aquarium heater in October of 2024 for my 65 gallon tall tank. From the beginning it didn't seem to heat the aquarium warm enough to 80 degrees. I had it next to the filter pump for flow and even set it to 84 degrees and it still never would keep a consistent warm temperature. But I was past the return window so i dealt with it. The final straw was today, when I did not unplug it when I was doing a water change (I thought I did when I unplugged the filter next to it). I normally do, but It says it has overheat protection that shuts the heater off when it gets to hot or is no longer submerged. No it doesn't! I walked over to the sink where my pump was draining the water into the sink for about 2 minutes. When I came back to the tank I smelled a burning plastic smell but didn't realize that the heater was burning and melting. I walked away for 30 seconds and came back going between the sink and tank trying to figure out what the smell was. Next I see smoke coming from the top of the tank and I hear a crackling noise. I look down into the tank and see the heater burning. I unplugged it and it still was melting. I managed to get a spatula and get the suction cups released from the tank and got the heater outside on the pavement, it was still crackling. Luckily it did not explode. My 9 inch 4 year old Severum is severely stressed, she usually likes to stay near the heater. Some of the black plastic and chemicals from it melting got in the water before I realized it was burning. Thank God it didn't crack my glass tank. I have learned my lesson not to buy knock off brands or to trust their safety features. And I have went back to the major store brand for my purchases.