hygger Aquarium Heater,75W/150W/300W Submersible Fish Tank Water Heater Double Quartz Explosion-Proof with for Freshwater Saltwater Tank

Nice product

I’m pretty sure this is oversized for my tank as it’s only 20 gallons. Since I have a heater built in to my Oase filter, I can’t adjust it. It just keeps the temperature at 78 degrees. I purchased this to raise the temperature of the tank when I had ICH. It heats my tank to 85 degrees in about an hour. It’s great to see the temperature displayed on the heater. There is also an indicator to let you know when the heater is working and when it’s reached the desired temperature. I like that I can even do water changes without having to unplug it. Once the water level goes just below the top of the heater, it displays ER and flashes letting you know that it has stopped heating. Once the water level goes above the heater, it automatically turns back on. Overall this is a great heater and I highly recommend it

This item, as well as the return experience with hygger, were total garbage. I ordered this on February 23rd of 2024, and had to buy a new heater on April 5th of 2024. Meanwhile, as it was still cold in my part of the country, I lost over a dozen fish in my 75 gallon tank when the temperature plunged due to the heater failure. I was expecting that the error systems and warnings would alert me to any issues, but the heater never showed any signs of error, just simply stopped working and lost all power. I only noticed this when double checking my manual thermometer one morning to find the tank temperature at 62 degrees F, and witnessed the carnage in the tank from all the tropical fish who died from temperature shock. Everything else was functioning on the same power strip/surge protector, and after trying multiple outlets on the strip as well as other outlets in my house I know are functional, there was simply no power going to the device. No lights, no sounds, no indication that there was any power flowing through the heater at all.Understanding that sometimes these things just happen, I tried reaching out to hygger support directly, as stated in the manual that came with the heater. However, their response was to demand I send them a video of the device not working. While this may sound trivial, it is terrible customer service, and I refuse to jump through needless hoops when trying to return a defective product. I will not be dealing with hygger support again, and will certainly not be purchasing any of their products in the future. I feel it was an expensive lesson ($47.32), but valuable in the long run. Congratulations, hygger. Your terrible customer service/return experience cost you a customer.Since then, I purchased the: Fluval E 300 Watt Electronic Heater, and have been nothing but pleased with the device. It doesn't look as sleek as the hygger, but totally delivers on functionality.

So, I originally purchased a very expensive aquarium heater when I first set up my 40 gallon tank. It was advertised as one of the very best. Right out of the box, it's performance was unpredictable. I never knew if the temp in my tank was even close to the same, all throughout the day or night. It gave many false readings, and took forever whenever the tank temp actually did go too low, (per readings of my intank mercury thermometer) to return to the setting.So, I took some advise and got this Hygger heater. It is so easy to read (even from across the room). So far, temp has remained with .1 degree in either direction of where I have it set. All the time.Needless to say....for now, I would highly recommend this heater as an excellent buy.Will update if something should change, (but not expecting that to happen)It doesnt require some crazy angle placement in tank...and while water flow is is important....it doesnt require extreme flow.worth every penny

Does its job. Good temperature control. For the cost well worth it. Easy to set up and easy to change temp. Display light for temp is very bright

This heater rocks, i use only one 500Watt for my 125 gal and it keeps my water warm. I had used water from my hose outside when it was cold upon set up and it was so low that it said low level. in 24 hrs my tank had gone from low level to 84 and maintained that

Amazing heater. The grip holder with suction cups fits perfectly and keeps it sturdy. This is a smart heater. Simple. Yet, it does its job. I like it a great deal & recommend it.