Zacro Aquarium Heater 100W Submersible Digital Display Mini Fish Tank Heater with Intelligent LED Temperature Display and External Temperature Controller, for 10-20gal Fish Tank

I use this heater for my turtle tub, needed something low profile as the water level is low! Does a perfect job of keeping the water the right temp when it’s cold out. Only downside is it easily gets knocked off from the suction cups.

The media could not be loaded.  This heater works very well, it keeps the tank at the set temperature within one degree so far. The remote is a GREAT feature, it’s so nice to not have to stick my hands in the tank every time I need to adjust it. But as other reviewers have said, if you have a smaller fish or is absolutely CRUCIAL that you block the space between the suction cups. Within one hour of putting this heater in the tank my betta was trying to wedge himself between them, where he would have gotten trapped and burned to death. I tore off pieces of a moss ball and stuffed them between the heater and the glass of my tank, and this keeps my betta from going between. In the video I uploaded you can see that he tried to do the same thing at the top of the filter, but that part isn’t as close to the glass so he can wiggle through. I blocked it with moss as well after I took the video because I don’t particularly want him resting behind the heater. This is a huge design flaw that I implore the manufacturers to fix by placing something between the suction cups to block access.

Very cool design! It is quite large compared to the tube style heaters, but usability is worth the sacrifice of space. The remote temperature adjustment is very nice.

Not sure which is off, the heater temp or the little temp reader. but they read a few degrees different. Easy to use though

This tank heater is amazing! I've ordered at least 5 of them, and have had no problems with either the heater or thermometer working. Batteries for the thermometer are included and even come with suction cups to better position in your aquarium. The remote for the heater is easy to use, and the guide for error codes is straightforward.I use these heaters for my 7.5 and 10 gallon tanks.My only gripe, is that sometimes the heater auctions arrive a little bent from shipping and packaging. Otherwise an amazing product!

Good value. Digital temperature control makes it easier to tell what temperature is set for. Others you plug in and hope they go to correct temperature

Fantastic design and perfect wattage...

Love the size for my shrimp tank. Worked fine for awhile because temp can be adjusted with the remote. Then the remote stopped working correctly, and the temperature cannot be lowered manually. Not comfortable leaving this to chance , so I ordered a thermometer that can be adjusted manually .