FEDOUR Mini Aquarium Heater 50W 100W, Submersible Fish Tank Heater with Thermometer, Shatterproof Heater for Saltwater and Fresh Water, Betta Heater (100W)

I really like that this has an external control so no need to take it out to adjust it.It had been working well for the last 8 weeks or so for me. I like that it shows the temperature on the heater.My digital thermometer says it runs a little hotter than shown, but overall happy so far with the effectiveness.

Great product, easy to instal and safe to use.

Product shows error code E1 when switched on and cannot be deleted, would like a replacement.

Great little heater, works well and digital temperature display is a bonus

Only lasted 2 month and noisy.

Bought two of these in February 2023, one for my community tank and one for my male Betta tank. Very easy to install, water temperature was always optimal and I was very pleased with the product. Last night both heaters failed whilst I was asleep. Nothing else in either tank had gone off and I had not had a power cut. In my community tank the heater had stopped working completely so the water was a little cool this morning but my fish were fine and I had spare heater (different brand) in a cupboard. Horrifically, in my Betta tank, the heater had gone to maximum temperature and poached my poor guy plus his snail mates. I'm so upset by the horribly cruel way my gorgeous Betta met his end. There is clearly a 'fail date' in the product of 15 months.

Great heater keeps tank to the perfect temperature and shows temperature on it!

Seems to be working really well in my small tank. Doesn’t take up much room.