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

This heater was a replacement for a flat heater that didn't work at all. Hygger has been a great brand for us. I have been happy with all of the aquarium equipment that I have purchased from them.The heater is in a 2.5 gallon tank. It's been maintaining a consistent temperature for several months now. So far, it seems durable and setting the temperature using the attached temperature control unit is very easy. I recommend this heater for small aquariums. The build quality and durability make this a good value for the money.

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.

this heater is perfect for small aquariums. I love that it has a safety feature where it shuts off if the water level gets too low. Every heater should have that, it's a shame they don't. This one does and for that reason, it's the one I use in all 3 of my small heated tanks (2.5 and 5.5 gallons)

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.

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 have purchased 3 of these heaters, only one is still working. The temperature controller has failed on two of them. On one the control button has completely depressed and cannot be used to change the temperature. On the second the heater will not turn off and the control button will not work at all. I would not recommend this heater. I purchased these separately over period of time, the last being in December of 2024. I have to say the other two were purchased within the same year.I have to amend the above review, all three have failed. I had forgotten that the one I'm still using has the depressed button that will not become unstuck (the temperature that it is at is still acceptable but I will be replacing it with another manufacturer's model). The other failure was a unit that just stopped working. All the units were purchased in 2024 and failed within one year of their being purchased.

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.

These heaters are great for small aquariums. I have two 5.5g aquariums and these heaters work like a charm. Easy to adjust the temperature rather than playing a guessing game.