hygger Aquarium Heater 300W/500W/800W/1000W, Submersible Fish Tank Heater with Digital LED Controller and Intelligent Leaving Water Automatically Stop Heating System, for Freshwater and Saltwater

Had an older glass heater go out and my tank dropped from 80 to 68. We purchased a Fluval from petsmart after driving 2 hours to the nearest store on a sunday. It was a 300W heater and rated for my 75G tank, however it never was able to get higher than 74.5 degrees. I ordered this heater because they didn't have a larger one at petsmart and it came in 2 days. it was able to get the tank up to 80 in just a few hours. I like that the gage is easy to read and has a ring that alerts you to the temp conditions as it's heating up. Even displays the watts it's using. The temp on the gage and my tank thermometer are within a couple of points of each other. This thing is working flawlessly and looks great as well. Hoping to return the Fluval as there's obviously an issue with its temp calibration.

Very nice and works well

It's supper easy to use. Very plug and play. I had read the reviews and seen a lot saying it was off 2 or 3 degrees but could test water and then set it accordingly.When I showed up I used 3 different digital thermometers and one manual mercury. All the digital had the same reading as the heater. And the manual was one degrees lower or less. Hard to tell if was .5 or 1.0.I ran a hot fire last and my tank was getting to hot as they are in the same room and I could see it's temperature going up..... it got to 82 before I had to start cooling the tank.When it drops down under the set temp it kicks on to 500ish wats and heats the tank rather quickly to 79.Cons....I tried to set it horizontal and it started to alarm out almost instantly. The temperature read 98° almost instantly. I wanted to hide this behind rocks in the main tank instead of the sump. Stuck to the back wall sideways it would misread and alarm. Bummer as it would need to be sideways in my sump if I put it there also.Not enough to doc a star but disappointed.Also control cable is a little short. Not bad but it would be a little convenient if had another 12"In the end I believe most of the bad reviews of melting are user created. Like left on or removed from water before it had cooled.

It works like any aquarium heater but is way more powerful as it is a 1kW heater (for an outdoor pond). What I like is the readout that says the temperature, easy 1 button setup, readout shows wattage, auto-shutoff if taken out of the water, and the heater adjusts output based on surrounding temp. Cons - the casing for readout is flimsy, not sure how long it will last before I start getting error readings and have a useless heater, wish it was bigger (had more surface area). UPDATE: after a few months of use I have encountered some issues. The casing enwraps the tubes too much so that heats build up quickly inside and the device reached set temp quickly. It then shuts off. Also as the device gets close to the desired temp it reduces the wattage output. All this would be great in an enclosed, housed inside, aquarium but does not bode well for a pond that has a large surface area. They need to keep the thermostat away from the heating tubes so the device has a better idea of the surrounding water temp. There is another hygger that has a more open casing and that one allows for more water to heating tube exposure. The temp controller had to be placed in another casing to prevent moisture/water damage.

I purchased this heater in November and it failed in April. However, with very little hassle The sent me a brand new one in a few days. Aslong as that first one was a dud and this one lasts ill be happy. Heats well. Easy to use. Until failure kept the pond perfect.

Sophisticated looking, works great!!!

Love love love this heater!! Never have toWorry about the temp again. Ordering it for all my other tanks

Edit: I need to correct my original review due to user error (doh!). I had placed the heater horizontal behind a plant to hide its ugliness. Once I repositioned it vertically and placed it closer to the filter output, it worked accurately. Seems to be maintaining the temps reasonably well. But, it's still ugly so only 3 stars.I bought this February 4 2025 as a spare to have on hand as my current heaters were getting up there in age and I didn't want to get empty handed if one suddenly died. Today, one of my heaters did die so I plugged this one in to replace it. What a cheap piece of crap. It has no clue what the temperature really is in the aquarium. Besides that, it's f-ing ugly with it's big orange band around the unit and it's giant hygger logo on the front. I tried to hide it behind a plant but it's still super obvious. Sadly I just passed the 30-day mark so there's no returning it now. Wish me luck with their customer service dept.