OrlushySubmersible Aquarium Heater,500W Fish Tahk Heater with Adjust Knob Thermostat 2 Suction Cups and Free Thermometer Suitable for Marine Saltwater and Freshwater (500W)

Ordered this heater over a year ago, and it is still going strong! It is one of the few heaters that will fit diagonally in my 20-long aquarium. I love that it has an included digital thermometer. I routinely check this to make sure the heater is at a consistent temperature (and it always is). It is easy to read and adjust, sticks well with the suction cups provided, and is easy to clean off. If it ever fails, I will buy it again for sure.

Heats up like it should , fish are still alive

Seems to work great for my 6.5 gallon. Love how small it is and the all black looks sleek and modern! Easy to use and works great!

I purchased 2 of these 1 year ago. I had a 20 gallon tank. The heater worked perfectly in that tank and maintained a steady temperature according to the supplied thermometer. I had to set the dial a few degrees lower than I wanted to get the temperature right. The 2nd was backup in case this one failed but I ended up with a smaller 10 gallon tank. This tank was in a room with wildly fluctuating temperatures from day to night. I ended up using this second to keep the temp from dropping below 72 degrees at night. I had snails and 2 small gold fish in this tank over the winter. It was set on the lowest setting and did the job.Last month I upgraded to a 29 gallon tank and I am still using the heater. At this point I noticed the heat on indicator light does not come on with small adjustments. I discovered the supplied thermometers are probably not even close to being accurate. They differ from 2 to 4 degrees from each other and the meat thermometer I used to double check the temperature. I will keep an eye on it. The other heater continues to work well enough. I will probably order another back up, they just don’t make things like they use to. 🙄

Just enough heat to keep the horse water tank from freezing.

Great heater for my size tank 2.5g. I just have my little for my desk and this heater works great. Great for the price and the betta "Mort" loves it. The shrimp even started to move around a bit more.

Excellent quality aquarium heater. Easy to use. Keeps accurate temperature. I definitely will buy again for my next aquarium.

It takes a bit to warm the water up, but since it’s summer and my AC has been running I can’t complain too much. I really enjoy the light aspect of red when it’s warming up, and green when it’s reached proper heat. I plan to order more for my other tanks