Finnex 50-Watt Hang-On Digital Controller Aquarium Heater, Titanium Tube, 10 to 20-Gallon

Actually, I'd give this 4.5 stars.

Keeps my 10 gallon tank within 1-2 degrees as advertised and seems sturdy enough to last a long time.

What I did not know from the product description and pictures on Amazon is that this unit also has a separate wired temperature sensor which also needs to be placed into the tank along with the heating element (but located far enough away from it so as not to be reading too high). So you actually have 3 pieces of equipment all connected together.

Also, the two suction cups on the heating element, while clinging to the glass with ease, tend to slide around with the gentlest of pressure. If you want to place your heating element just right you will have to be very careful not to move the cords or disturb anything that touches it.

Pros:

Solidly built

Keeps temp to within 2 degrees

No glass parts to crack

Separate sensor placed away from heater gives a more accurate reading

Digital readout of current temperature

High temperature safety shut-off feature

Cons:

Separate sensor is just another thing that will take up space in a small tank (albiet it is small itself)

Suction cups on heater slide on glass easily if disturbed

Main cord to heating element could be a bit longer

So far, this heater has been stable holding temps on my Eheim Aquastyle 9 tank (rimless design). Setting seems easy enough.

My only concern is that in my application the cable that goes into the tank for the heating unit itself is fairly thick and causes the glass lid for my particular tank to not sit flat. I've lost a couple of shrimp that climbed over the edge due to this. I'm in the process of creating a new top cover that will have a notch for the heater cable so that the cover can sit closer to the edge of the glass and hopefully avoid any more escapee issues.

I think the product could be slightly improved by using a flat power cable like the heater that I upgraded from used.

My situation is probably not common, so for most tanks this seems like a very good product.

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its been workin great and very easy to use, heater element is shorter than expected, I know it only comes with a 6 month warranty so we see if it lasts past the mark

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I really like this heater. Its very short so it will fit in most hob filters and be out of sight.

I also like that it has a digital programmable read out,which makes it much easier to read and set the temp.

If you need a small submersible heater this is it. :>)

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This worked great -for as long as it worked. Suddenly after 6 months, it burned out: The middle of the heating element is now black. Since it has only a 180 day warranty, we were out of luck. the manufacturer offered to replace component parts of it for a fee -but we would have to ship the unit back to them and we couldn't leave the tank without a heater. So we replaced it with a $10 heater that has a two-year warranty, so that heater could go out three times in a year and we'd still come out comparitively ahead. I'm extremely disappointed in this unit and manufacturer.