DONGKER Aquarium Heater, 1200W Submersible Fish Tank Heater Fast Heating W/Extra LED Temperature Controller for 100-185 Gallon Saltwater and Freshwater

Bought this in February and has been working fine since until this week when the water temperature went up to 41 degrees even though the display was still saying 26 degrees. Luckily this was only on my 60 gallon water change tank so didn't have any fish to lose but would have done had it been in a stock tank. Can't get any product support whatsoever after 30 days, so just have to write it off. Wouldn't want a replacement anyway. Will only buy branded stuff off Amazon in future as guarantees just aren't there.

This product is used for an outdoor pond, with a lid and keeps reaaly good temperature unlike others i have had, the suction isnt the best, but i just put it vertical on one cup leaving it to hang down.The pond / tank measures 1.4m x 0.800m x 1.1m deep

I came home from work and the water had heated up to 41°C and has killed all of my fish, I've had this tank and fish many years and a lot of the fish are irreplaceable also hundreds of pounds lostDo Not BuyI had to give it a star just so I could review this piece of crap, it definitely isn't worth any stars

Perfect for big tanks

thank you its great

worked ok for a few weeks then rhe temp went a bit offthen melted the plug overall not happymaybe i had a duff bought because other reviews were okupdate was contacted asked if i would like refund to which i said would be great. then tried to say i put too much power through it not sure how just plugged it inhavent heard anything else doubt i will now

Went to tank tonight and read 21 water temp temp set at 28. Possibly £1000 fish going to die

The product works fine, however makes some disturbing noises when heating up.