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

I purchased a smaller heater (not hygger) that did not keep consistent heat. It would drop down at night when it got cold. THIS little guy has great suction cups and keeps very consistent heat. Hygger products have made their way into several of my aquarium needs and don’t disappoint. This heater is a great value and an exceptional product. Buy with confidence.

After extensive research, I settled on this heater for my betta nano tank. I’ve been using it now for about a month with zero issues and the heat setting is very accurate.

This small heater works really well, but just note the accuracy may be off on the control. I noticed the unit is about 2 degrees off, not a huge deal just keep it in mind (your accuracy may be different so don't go by my 2 degree difference).The heater seems to heat up at a decent rate. You won't get controls in other compact heaters similar in size so this unit is fantastic and convenient.I'll update my review if I find any issues with longevity.

It's perfect for a twenty gallon aquarium.

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 great in 5 gallon

Great heater. Simple to use and works great for my 20 gallon long tank and my 5 gallon paludarium.

This is a nice little heater. The digital readout is brigh and easy to read. It seems to be pretty accurate as it reads the same as the alcohol thermometer that I put in with it. My only complaint is that the readout & temp module is on the wrong end of the power cord. It is much closer to the plug end rather than the aquarium end so that if you want the readout near the aquarium, chances are there won’t be enough cord length to reach an outlet.