hygger Small Aquarium Betta Heater, Submersible Fish Tank Heater 10W/25W/50W/100W with LED Digital Display, Suitable for Marine Saltwater and Freshwater up to 5/10/16/26 Gallon

It is a great small heater. Packaged nicely and came on time.I purchased a five gallon aquarium and after I set it up with conditioned water and plants, and light, I installed the heater and let it sit without power for 24 hours. I then plugged it in and set the thermometer to 78 degrees. The next day, I checked the temp on the heater and it read that it was 84. That was a too high for the Betta Fish I plan to add when the aquarium is set. I then took two reading with different thermometers and they were right at the the 79 degree temp required for the Betta.This is an excellent heater for a small fish tank. I recommend that the temperature be checked to insure that the correct temp is set where you might want it.

I needed a heater I could adjust for a 2 gallon betta tank. It’s been cycling for a couple weeks with guppies until the betta moves in. Last weekend the water got too warm because the weather was hot and the heater I was using doesn’t have a thermostat. This little Hygger 10 watt heater is perfect!1) the heater is small in size for the tiny tank.2) it is thermostatically controlled3) it is very easy to adjust with the external gizmo on the wire.In the photo the heater is near the bottom of the tank, near unseen behind a ceramic pagoda. This little heater has all the bells and whistles heaters for big tanks have!

I bought this for its small size to use in a small hospital tank. When I first turned it on, it got up to temp fairly fast but when I stuck my hand in the tank much of the water was still cold. I gave it a good stir and then all was well. It seemed like it thought it had reached temp because the water immediately around the heater was warm so it was holding steady there. This might only be an issue on tanks with no circulation. Once I manually circulated the water it did great and held temp nicely. The temp is matching my floating thermometer within a degree or so. I would recommend primarily due to its small size.

Works extremely well for what it is. I'm using for 5.5 gallon aquarium. Love that it has an automatic shut off/no heating feature if the temp goes one tick above the set temp. May end up buying again for another tank. I enjoy the heaters that you can control the setting on. The preset heaters that have no control option are all trash. Value is nice too.

It was a perfect fit for my tank, which is a curved globe

Heat timing is terrible!I bought a 2.5 gallon tank and heater from the local aquarium with a heater that was pre-set at 78 degrees. My betta fish like the tank to be about 79-80 degrees so I bought the hygger tank heater because it allows for heat adjustments.Keep in mind, my tank was ALREADY at 78 degrees when I put the hygger heater in. How hard could it be to jack up the heat by ONE degree?? Apparently, very hard.I took out the old heater, put the new hygger heater in, and set the temperature for 79. Unfortunately, the hygger STARTS at 62 degrees and works its way up to the desired temperature. That's crazy!! Why doesn't it automatically start at 78 like every other preset heater??? 19 hours later, and my tank is still only at 78 degrees.Nowhere on the box or in the instructions does it say that the heater starts at 62 degrees or that it takes a full day (maybe more...who knows??!) to get it up to the desired temperature. I thought about leaving the other heater in the tank while I waited for the hygger to finally kick in, but I didn't want the hygger to detect warmer water and stop working (as the directions say it will do), and I didn't want to risk over heating my fish.Overall, just really poor directions and a total lack of communication on how slowly the heater would reach 79 degrees.My poor betta fish is doing fine so far but I feel bad for him having been so stressed.

Works as should. Holds temp within 3degrees small and compact.

Great heater for the price. Haven’t had the first problem out of it. Would buy again.