Fluval M 50-Watt Submersible Heater

Good price for a 100w heater. Been using it for a few months now. Seems to hold temperature pretty accurately. I would but this again.

Love this heater. It is beautiful and it has been doing it's job perfectly for over a year.

This M series 200 watt heater is a bit overkill for my 32.5 gallon tank. But it works great!I however wouldn't rely on the temperature setting gauge on the device. The best way to properly setup a heater is to set it to come on at just the right temp you want it at. Then monitor the temps over the next few hours and raise or lower the dial to match the actual temperature you want. The dials are seldom that accurate on their own.Try to attach the suction cups near the top. Don't have the holder setting on the coil area as it can melt the plastic. Also don't let the heat bulb touch anything near it. It can damage whatever it touches and can be damaged if something is leaning on it when it turns on.Place this heater away from invertebrates and snails. They can be burned or killed if the heater turns on when they are crawling around on it.These M series Fluval heaters are good heaters and I've used different wattages of them for years. But if you use them, pay attention to your tank's temps. If they stick on, they can cook your inhabitants. If they don't turn on, your tank temp could also get too cold.These heaters also are not intended to change the temp of the tank water more than 10-15 degrees total over time. They should not be used for outside use or when the room temp is way below the temp you want your tank water. They are designed to heat a few degrees only.Be sure the glass tube is not cracked or broken. Water must not contact the inside of the tube.

Just got this unit for my tank 15 days ago and got shocked for the first time. Instructions do say unplug every time you’re going to put your hands in water. And I do that out of precaution and if the unit fails. But today I was just going to adjust its water level, just by a splash I felt a shock in my finger tip. It felt like a static shock. My fish are ok but I do not want it to kill my fish. I’m not sure if this is normal, but am returning the product and get a replacementIt is a very nice product for sure. I use it for my 20 gallon that sits near the balcony, where temp feels like partly outdoor. It kept my platy fry alive in 40-50sF.

The media could not be loaded. Here's how I have mine hidden and what it looks like. Don't mind the driftwood tannins, they like it. Adjustment was easy, and the mounting suction cups/bracket are great. The cord is somewhat flat too. There is a dim blue light that illuminates when it's heating, i have it positioned so I can just barely see it, at least when my curious Cichlid isn't in the way. 🙃If you happen to have a chrome theme in your tank, this would only add to that vibe!

This 200W heater is relatively small compared to others, being a smaller diameter that fits an aquarium well and is also reasonably short for a flexible installation. The blue light is a mixed blessing for telling if the heater is on or off. The soft blue LED doesn't disturb the tank scene but, it also makes it hard to see if the heater is actually working!

I just removed over 30% of the dirty water which I could have done a lot more, but didn’t thank heavens. I cleaned the tank and accessories to give it a fresh start for my new heater. The temperature dropped rapidly as I replaced the water but I had installed my new Fluval 100w heater for the 30 gallon tank I have. Then I started to panic as I was counting on the heater to bring it back up to the correct temperature. Instead, nothing.I followed the troubleshooting directions to no avail. In the return process, it asks if I’ve removed the item from the package and if I have the original packaging which I do, but it concerns me that they will just send it out to some other unsuspecting aquarium hobbyist. I highly recommend if you order this item, which unfortunately I cannot recommend, to test it out first before you did what I did. Make sure it’s covered as indicated in their directions in a container of water beforehand.My fish is 6 years old. I thought Fluval was a trusted brand. I also had issues with their HOB filter for this same tank. It clogs easily. I returned from a 10 day trip to Europe only to smell smoke coming from the room where my tanks are. The filter had overflowed and water ran down the back of the tank, onto my area rug and hardwood floor. Worst though, was it dripped onto my surge suppressor and was smoking! Ironically, the surge suppressor came from Amazon too as some obscure Prime Day deal. Well, that also was replaced with the trusted Belkin name. During this incident, I had a pet sitter come while I was gone so it’s not like I left them with no supervision but really?? Who knows how much longer until a fire could have broken out. This was during the time Fluval acquired Aqueon. And of course it wasn’t returnable through Amazon so I had to suck it up and buy another filter. But I went with the Tidal brand which I have in my 72 gallon tank. To get functioning, reliable items has been like rolling the proverbial rock up a hill. It’s the cost, time, and aggravation that is exhausting. I thought Fluval was a trusted brand? For me, it’s been problem after problem with several of their products and it’s just exasperating. I need a reliable aquarium heater. Not one I that I have to worry about. So now I have schlep this broken heater back to Staples and find a reliable heater. Like this shouldn’t be so hard.Oh, and if you pre-test it as I suggested, there is supposed to be an indicator light. I can’t say where it’s located as no light ever came on. But make sure your light works. And obviously you can feel when the heater warms.

The fluval 150 watt submersible heater was easy to use. The temperature was on point when set.