FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heaters with Over-Temperature and Off-Water Protection for 10-20 Gallon Saltwater and Freshwater

Works great. Thank heats up fast and accurate. Not overly expensive compared to some brands. Easy to set temperature. Should hold up well in saltwater. Small so it fits in the sump for tank.

Great heater so far. Keeps an accurate temp and most importantly it fits perfectly in my sump. I bought this specifically because it was the smallest 500w heater I could find.

Out of 5 heaters this one is the best.Great temp control.

My hygger heater kicked the bucket so I had to order a new one. I wanted one without a complicated thermostat, and this one fit the bill. It arrived quickly and it does the job. It heats the tank well, the thermostat is accurate and easy to set and adjust, and it keeps the temperature in the tank stable. I will have to order a spare. Love this heater!

I initially set the unit to my target of 76. After running it 8 hours, it kept the tank at 78. Knocked it down a couple degrees to 74 and achieved my 76. As long as it stays consistent I’m happy. I cross referenced 2 other thermometers. A food probe and a sticker thermometer. Ultimately it could be because of my tank, flow etc. it’s definitely an upgrade from the one I inherited from the previous owner of my tank.

Works great

Highly recommend

While the unit itself is nice and user friendly, it would have been nice if it came with the suction cups so I could use it properly!! Checked the box and no such luck! Also the thermometer that came with it dosen't work at all